From dcc19e9425659882b44eed68c9a3241b6f700204 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Wed, 2 Oct 2019 10:25:16 +0200
Subject: [PATCH 01/35] Try removing the ipyparallel client caching mechanism.

---
 pygmo/_py_islands.py | 53 ++++++--------------------------------------
 1 file changed, 7 insertions(+), 46 deletions(-)

diff --git a/pygmo/_py_islands.py b/pygmo/_py_islands.py
index 6e7f15919..16e4d68bb 100644
--- a/pygmo/_py_islands.py
+++ b/pygmo/_py_islands.py
@@ -449,28 +449,6 @@ def shutdown_pool():
                 mp_island._pool_size = None
 
 
-# NOTE: the idea here is that we don't want to create a new client for
-# every island: creation is expensive, and we cannot have too many clients
-# as after a certain threshold ipyparallel starts erroring out.
-# So we store the clients as values in a dict whose keys are the arguments
-# passed to Client() upon construction, and we re-use existing clients
-# if the construction arguments are identical.
-# NOTE: this is not a proper cache as it never kicks anything out, but as
-# a temporary solution it is fine. Consider using something like a LRU
-# cache in the future.
-_client_cache = {}
-_client_cache_lock = _Lock()
-
-
-def _hashable(v):
-    # Determine whether v can be hashed.
-    try:
-        hash(v)
-    except TypeError:
-        return False
-    return True
-
-
 class ipyparallel_island(object):
     """Ipyparallel island.
 
@@ -492,32 +470,15 @@ def __init__(self, *args, **kwargs):
 
     def _init(self, *args, **kwargs):
         # A small helper function which will do the following:
-        # * get a client from the cache in a thread safe manner, or
-        #   create a new one from scratch
-        # * store the input arguments as class members
-        # * create a LoadBalancedView from the client
-        # * create a lock to regulate access to the view
+        # * create a new client from scratch,
+        # * store the input arguments as class members,
+        # * create a LoadBalancedView from the client,
+        # * create a lock to regulate access to the view,
         # * return the view.
         from ipyparallel import Client
-        # Turn the arguments into something that might be hashable.
-        # Make sure the kwargs are sorted so that two sets of identical
-        # kwargs will be recognized as equal also if the keys are stored
-        # in different order.
-        args_key = (args, tuple(sorted([(k, kwargs[k]) for k in kwargs])))
-        if _hashable(args_key):
-            with _client_cache_lock:
-                # Try to see if a client constructed with the same
-                # arguments already exists in the cache.
-                rc = _client_cache.get(args_key)
-                if rc is None:
-                    # No cached client exists. Create a new client
-                    # and store it in the cache.
-                    rc = Client(*args, **kwargs)
-                    _client_cache[args_key] = rc
-        else:
-            # If the arguments are not hashable, just create a brand new
-            # client.
-            rc = Client(*args, **kwargs)
+
+        # Create the client.
+        rc = Client(*args, **kwargs)
 
         # Save the init arguments.
         self._args = args

From eb634e1eff77964b97835fb6c7de779805b6dcf4 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Wed, 2 Oct 2019 13:22:56 +0200
Subject: [PATCH 02/35] Try raising ulimit -n.

---
 tools/install_travis.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index 29afd5595..ce9fcdaac 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -6,6 +6,9 @@ set -x
 # Exit on error.
 set -e
 
+ulimit -n
+ulimit -n 10000
+
 if [[ "${PAGMO_BUILD}" != manylinux* ]]; then
     export deps_dir=$HOME/local
     export PATH="$HOME/miniconda/bin:$PATH"

From 36c04730ac1e80434a1436e90f65683aef3289a7 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Wed, 2 Oct 2019 13:42:47 +0200
Subject: [PATCH 03/35] Forgot the dll version bump in the previous pr.

---
 CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2c21bb5b..34c53fe58 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -283,8 +283,8 @@ if(PAGMO_BUILD_PAGMO)
 
     # Setup of the pagmo library.
     add_library(pagmo SHARED "${PAGMO_SRC_FILES}")
-    set_property(TARGET pagmo PROPERTY VERSION "1.0")
-    set_property(TARGET pagmo PROPERTY SOVERSION 1)
+    set_property(TARGET pagmo PROPERTY VERSION "2.0")
+    set_property(TARGET pagmo PROPERTY SOVERSION 2)
     target_compile_options(pagmo PRIVATE "$<$<CONFIG:DEBUG>:${PAGMO_CXX_FLAGS_DEBUG}>" "$<$<CONFIG:RELEASE>:${PAGMO_CXX_FLAGS_RELEASE}>")
     set_target_properties(pagmo PROPERTIES CXX_VISIBILITY_PRESET hidden)
     set_target_properties(pagmo PROPERTIES VISIBILITY_INLINES_HIDDEN TRUE)

From 7f77d0574611204c3ddc7124616e08699ad843a1 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Wed, 2 Oct 2019 13:43:02 +0200
Subject: [PATCH 04/35] Try raising ulimit more on travis. [skip appveyor]

---
 tools/install_travis.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index ce9fcdaac..b6bfa62b2 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -7,7 +7,8 @@ set -x
 set -e
 
 ulimit -n
-ulimit -n 10000
+ulimit -n 60000
+ulimit -n
 
 if [[ "${PAGMO_BUILD}" != manylinux* ]]; then
     export deps_dir=$HOME/local

From 298ad9590ea4f0ed6e507b0f0ee57882d2bdbdf7 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 00:32:16 +0100
Subject: [PATCH 05/35] Evovling the implementation.

---
 pygmo/_py_islands.py    | 14 ++++++++------
 tools/install_travis.sh |  4 ----
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/pygmo/_py_islands.py b/pygmo/_py_islands.py
index 16e4d68bb..02d7e6bfd 100644
--- a/pygmo/_py_islands.py
+++ b/pygmo/_py_islands.py
@@ -471,19 +471,20 @@ def __init__(self, *args, **kwargs):
     def _init(self, *args, **kwargs):
         # A small helper function which will do the following:
         # * create a new client from scratch,
-        # * store the input arguments as class members,
+        # * store a copy of the input arguments as class members,
         # * create a LoadBalancedView from the client,
         # * create a lock to regulate access to the view,
         # * return the view.
         from ipyparallel import Client
+        from copy import deepcopy
+
+        # Save the init arguments.
+        self._args = deepcopy(args)
+        self._kwargs = deepcopy(kwargs)
 
         # Create the client.
         rc = Client(*args, **kwargs)
 
-        # Save the init arguments.
-        self._args = args
-        self._kwargs = kwargs
-
         # NOTE: we need to regulate access to the view because,
         # while run_evolve() is running in a separate thread, we
         # could be doing other things involving the view (e.g.,
@@ -504,7 +505,8 @@ def __getstate__(self):
         # For pickle/unpickle, we employ the construction
         # arguments, which will be used to re-init the class
         # during unpickle.
-        return self._args, self._kwargs
+        from copy import deepcopy
+        return deepcopy(self._args), deepcopy(self._kwargs)
 
     def __setstate__(self, state):
         self._lview = self._init(*state[0], **state[1])
diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index b6bfa62b2..29afd5595 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -6,10 +6,6 @@ set -x
 # Exit on error.
 set -e
 
-ulimit -n
-ulimit -n 60000
-ulimit -n
-
 if [[ "${PAGMO_BUILD}" != manylinux* ]]; then
     export deps_dir=$HOME/local
     export PATH="$HOME/miniconda/bin:$PATH"

From f8a665a563206bd2da7a14296ee4324f0b95b565 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 00:41:12 +0100
Subject: [PATCH 06/35] Try adding a conda-based py38 build.

---
 .circleci/config.yml                     |  9 ++++++
 tools/circleci_bionic_gcc7_conda_py38.sh | 41 ++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 tools/circleci_bionic_gcc7_conda_py38.sh

diff --git a/.circleci/config.yml b/.circleci/config.yml
index b838aee59..993fe3458 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,6 +1,14 @@
 version: 2
 
 jobs:
+  bionic_gcc7_conda_py38:
+    docker:
+    - image: circleci/buildpack-deps:bionic
+    steps:
+    - checkout
+    - run:
+        name: Build and test
+        command: bash ./tools/circleci_bionic_gcc7_conda_py38.sh
   bionic_gcc7_coverage:
     docker:
     - image: circleci/buildpack-deps:bionic
@@ -38,6 +46,7 @@ workflows:
   version: 2
   all_builds:
     jobs:
+    - bionic_gcc7_conda_py38
     - bionic_gcc7_coverage
     - cosmic_gcc8_asan
     - cosmic_clang7
diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
new file mode 100644
index 000000000..71665777a
--- /dev/null
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+
+# Echo each command
+set -x
+
+# Exit on error.
+set -e
+
+# Core deps.
+sudo apt-get install build-essential wget
+
+# Install conda+deps.
+wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh
+export deps_dir=$HOME/local
+export PATH="$HOME/miniconda/bin:$PATH"
+export PATH="$deps_dir/bin:$PATH"
+bash miniconda.sh -b -p $HOME/miniconda
+conda config --add channels conda-forge --force
+conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.8 numpy cloudpickle dill ipyparallel numba pip"
+conda create -q -p $deps_dir -y
+source activate $deps_dir
+
+# Build/install pagmo.
+mkdir build
+cd build
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_TESTS=no -DPAGMO_WITH_EIGEN3=yes -DPAGMO_WITH_NLOPT=yes -DPAGMO_WITH_IPOPT=yes
+make -j2 VERBOSE=1 install
+
+# Build/install pygmo.
+cd ..
+mkdir build_py
+cd build_py
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_PAGMO=no -DPAGMO_BUILD_PYGMO=yes
+make -j2 VERBOSE=1 install
+
+# Run the tests.
+cd /
+python -c "import pygmo; pygmo.test.run_test_suite(1)";
+
+set +e
+set +x

From 9428f8b7cb55a89aa278ea4234022cd5f3a21ab0 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 00:45:41 +0100
Subject: [PATCH 07/35] Debug.

---
 .circleci/config.yml                     | 9 ++++-----
 tools/circleci_bionic_gcc7_conda_py38.sh | 1 +
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 993fe3458..dd77785c6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -47,8 +47,7 @@ workflows:
   all_builds:
     jobs:
     - bionic_gcc7_conda_py38
-    - bionic_gcc7_coverage
-    - cosmic_gcc8_asan
-    - cosmic_clang7
-    - bionic_clang6_release
-    
\ No newline at end of file
+    # - bionic_gcc7_coverage
+    # - cosmic_gcc8_asan
+    # - cosmic_clang7
+    # - bionic_clang6_release
diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index 71665777a..3cb056805 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -19,6 +19,7 @@ conda config --add channels conda-forge --force
 conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.8 numpy cloudpickle dill ipyparallel numba pip"
 conda create -q -p $deps_dir -y
 source activate $deps_dir
+conda install $conda_pkgs -y
 
 # Build/install pagmo.
 mkdir build

From 6cb5d4c122c0c9ab8338a632bb19960025a851b3 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 00:52:48 +0100
Subject: [PATCH 08/35] WIP.

---
 tools/circleci_bionic_gcc7_conda_py38.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index 3cb056805..aa0f2f602 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -24,16 +24,21 @@ conda install $conda_pkgs -y
 # Build/install pagmo.
 mkdir build
 cd build
-cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_TESTS=no -DPAGMO_WITH_EIGEN3=yes -DPAGMO_WITH_NLOPT=yes -DPAGMO_WITH_IPOPT=yes
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_TESTS=no -DPAGMO_WITH_EIGEN3=yes -DPAGMO_WITH_NLOPT=yes -DPAGMO_WITH_IPOPT=yes -DBoost_NO_BOOST_CMAKE=ON
 make -j2 VERBOSE=1 install
 
 # Build/install pygmo.
 cd ..
 mkdir build_py
 cd build_py
-cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_PAGMO=no -DPAGMO_BUILD_PYGMO=yes
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_PAGMO=no -DPAGMO_BUILD_PYGMO=yes -DBoost_NO_BOOST_CMAKE=ON
 make -j2 VERBOSE=1 install
 
+# Start ipcluster.
+ipcluster start --daemonize=True;
+# Give some time for the cluster to start up.
+sleep 20;
+
 # Run the tests.
 cd /
 python -c "import pygmo; pygmo.test.run_test_suite(1)";

From 485d29ea68db029d7263920da247046b17db8e15 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 01:05:47 +0100
Subject: [PATCH 09/35] More tentative WIP.

---
 pygmo/_py_islands.py | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/pygmo/_py_islands.py b/pygmo/_py_islands.py
index 02d7e6bfd..b0e1fcada 100644
--- a/pygmo/_py_islands.py
+++ b/pygmo/_py_islands.py
@@ -71,11 +71,13 @@ def _evolve_func_mp_pipe(conn, ser_algo_pop):
             conn.close()
 
 
-def _evolve_func_ipy(algo, pop):
+def _evolve_func_ipy(ser_algo_pop):
     # The evolve function that is actually run from the separate processes
     # in ipyparallel_island.
+    import pickle
+    algo, pop = pickle.loads(ser_algo_pop)
     new_pop = algo.evolve(pop)
-    return algo, new_pop
+    return pickle.dumps((algo, new_pop))
 
 
 class mp_island(object):
@@ -535,9 +537,11 @@ def run_evolve(self, algo, pop):
 
 
         """
+        import pickle
+        ser_algo_pop = pickle.dumps((algo, pop))
         with self._view_lock:
-            ret = self._lview.apply_async(_evolve_func_ipy, algo, pop)
-        return ret.get()
+            ret = self._lview.apply_async(_evolve_func_ipy, ser_algo_pop)
+        return pickle.loads(ret.get())
 
     def get_name(self):
         """Island's name.

From bd07cf190e31b3053b9c611b9f76ded48a1d8695 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 01:22:23 +0100
Subject: [PATCH 10/35] Disable ipyparallel for now.

---
 tools/circleci_bionic_gcc7_conda_py38.sh | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index aa0f2f602..c8638bbd4 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -16,7 +16,7 @@ export PATH="$HOME/miniconda/bin:$PATH"
 export PATH="$deps_dir/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
 conda config --add channels conda-forge --force
-conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.8 numpy cloudpickle dill ipyparallel numba pip"
+conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.8 numpy cloudpickle dill numba pip"
 conda create -q -p $deps_dir -y
 source activate $deps_dir
 conda install $conda_pkgs -y
@@ -34,11 +34,6 @@ cd build_py
 cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_PAGMO=no -DPAGMO_BUILD_PYGMO=yes -DBoost_NO_BOOST_CMAKE=ON
 make -j2 VERBOSE=1 install
 
-# Start ipcluster.
-ipcluster start --daemonize=True;
-# Give some time for the cluster to start up.
-sleep 20;
-
 # Run the tests.
 cd /
 python -c "import pygmo; pygmo.test.run_test_suite(1)";

From 2a500e5670995f750bcc8eb0e88f4cc6d85527f3 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 01:58:44 +0100
Subject: [PATCH 11/35] Try 3.7.

---
 tools/circleci_bionic_gcc7_conda_py38.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index c8638bbd4..89bae5a4a 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -16,7 +16,7 @@ export PATH="$HOME/miniconda/bin:$PATH"
 export PATH="$deps_dir/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
 conda config --add channels conda-forge --force
-conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.8 numpy cloudpickle dill numba pip"
+conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.7 numpy cloudpickle dill numba pip"
 conda create -q -p $deps_dir -y
 source activate $deps_dir
 conda install $conda_pkgs -y

From 6acd21276cdcec43628eabc1abae391e7ef98152 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 02:21:39 +0100
Subject: [PATCH 12/35] Debug.

---
 tools/circleci_bionic_gcc7_conda_py38.sh | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index 89bae5a4a..b6359fe89 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -16,7 +16,7 @@ export PATH="$HOME/miniconda/bin:$PATH"
 export PATH="$deps_dir/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
 conda config --add channels conda-forge --force
-conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.7 numpy cloudpickle dill numba pip"
+conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=3.8 numpy cloudpickle dill numba pip"
 conda create -q -p $deps_dir -y
 source activate $deps_dir
 conda install $conda_pkgs -y
@@ -38,5 +38,14 @@ make -j2 VERBOSE=1 install
 cd /
 python -c "import pygmo; pygmo.test.run_test_suite(1)";
 
+echo "DONE"
+echo "DONE"
+echo "DONE"
+echo "DONE"
+echo "DONE"
+echo "DONE"
+echo "DONE"
+ps aux
+
 set +e
 set +x

From d046e0d8455ae493e105bfcb65247b53014e400d Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 14:46:07 +0100
Subject: [PATCH 13/35] Workaround for py38 bug.

---
 tools/circleci_bionic_gcc7_conda_py38.sh | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index b6359fe89..2131b5ac7 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -36,16 +36,7 @@ make -j2 VERBOSE=1 install
 
 # Run the tests.
 cd /
-python -c "import pygmo; pygmo.test.run_test_suite(1)";
-
-echo "DONE"
-echo "DONE"
-echo "DONE"
-echo "DONE"
-echo "DONE"
-echo "DONE"
-echo "DONE"
-ps aux
+python -c "import pygmo; pygmo.test.run_test_suite(1); pygmo.mp_island.shutdown_pool()";
 
 set +e
 set +x

From 914694e67b51b7af98e41ce98b21feeff2b8d372 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 17:43:30 +0100
Subject: [PATCH 14/35] Small tweaks. [skip ci]

---
 pygmo/_py_islands.py | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/pygmo/_py_islands.py b/pygmo/_py_islands.py
index b0e1fcada..0342d54bc 100644
--- a/pygmo/_py_islands.py
+++ b/pygmo/_py_islands.py
@@ -71,15 +71,6 @@ def _evolve_func_mp_pipe(conn, ser_algo_pop):
             conn.close()
 
 
-def _evolve_func_ipy(ser_algo_pop):
-    # The evolve function that is actually run from the separate processes
-    # in ipyparallel_island.
-    import pickle
-    algo, pop = pickle.loads(ser_algo_pop)
-    new_pop = algo.evolve(pop)
-    return pickle.dumps((algo, new_pop))
-
-
 class mp_island(object):
     """Multiprocessing island.
 
@@ -451,6 +442,15 @@ def shutdown_pool():
                 mp_island._pool_size = None
 
 
+def _evolve_func_ipy(ser_algo_pop):
+    # The evolve function that is actually run from the separate processes
+    # in ipyparallel_island.
+    import pickle
+    algo, pop = pickle.loads(ser_algo_pop)
+    new_pop = algo.evolve(pop)
+    return pickle.dumps((algo, new_pop))
+
+
 class ipyparallel_island(object):
     """Ipyparallel island.
 
@@ -537,6 +537,9 @@ def run_evolve(self, algo, pop):
 
 
         """
+        # NOTE: as in the mp_island, we pre-serialize
+        # the algo and pop, so that we can catch
+        # serialization errors early.
         import pickle
         ser_algo_pop = pickle.dumps((algo, pop))
         with self._view_lock:
@@ -559,6 +562,7 @@ def get_extra_info(self):
             str: a string with extra information about the status of the island
 
         """
+        from copy import deepcopy
         with self._view_lock:
-            d = self._lview.queue_status()
+            d = deepcopy(self._lview.queue_status())
         return "\tQueue status:\n\t\n\t" + "\n\t".join(["(" + str(k) + ", " + str(d[k]) + ")" for k in d])

From 6643a5349f3017f18322ef0d241186e609b5e15b Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 17:50:22 +0100
Subject: [PATCH 15/35] Workaround try. [skip appveyor]

---
 pygmo/_island_test.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pygmo/_island_test.py b/pygmo/_island_test.py
index ba3823fb1..95e91adb4 100644
--- a/pygmo/_island_test.py
+++ b/pygmo/_island_test.py
@@ -612,6 +612,7 @@ def run_basic_tests(self):
         from . import ipyparallel_island
         from copy import copy, deepcopy
         from pickle import dumps, loads
+        import gc
         to = .5
         try:
             isl = island(algo=de(), prob=rosenbrock(),
@@ -675,3 +676,4 @@ def run_basic_tests(self):
             isl.wait()
             self.assertTrue("**error occurred**" in repr(isl))
             self.assertRaises(RuntimeError, lambda: isl.wait_check())
+            gc.collect()

From e42ada397ba1d5525785bb2b949ca4a9d7a43521 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 18:03:33 +0100
Subject: [PATCH 16/35] Another approach. [skip appveyor]

---
 pygmo/_island_test.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/pygmo/_island_test.py b/pygmo/_island_test.py
index 95e91adb4..2121dd5aa 100644
--- a/pygmo/_island_test.py
+++ b/pygmo/_island_test.py
@@ -612,7 +612,6 @@ def run_basic_tests(self):
         from . import ipyparallel_island
         from copy import copy, deepcopy
         from pickle import dumps, loads
-        import gc
         to = .5
         try:
             isl = island(algo=de(), prob=rosenbrock(),
@@ -669,11 +668,10 @@ def run_basic_tests(self):
             return
 
         # Check exception transport.
-        for _ in range(1000):
+        for _ in range(100):
             isl = island(algo=de(), prob=_prob(
                 lambda x, y: x + y), size=2, udi=ipyparallel_island(timeout=to + .3))
             isl.evolve()
             isl.wait()
             self.assertTrue("**error occurred**" in repr(isl))
             self.assertRaises(RuntimeError, lambda: isl.wait_check())
-            gc.collect()

From 5d3356b41ad347062ab910822c4876ee73bac7a3 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 18:20:13 +0100
Subject: [PATCH 17/35] WIP [skip appveyor]

---
 pygmo/_island_test.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pygmo/_island_test.py b/pygmo/_island_test.py
index 2121dd5aa..ba658af5c 100644
--- a/pygmo/_island_test.py
+++ b/pygmo/_island_test.py
@@ -668,7 +668,7 @@ def run_basic_tests(self):
             return
 
         # Check exception transport.
-        for _ in range(100):
+        for _ in range(10):
             isl = island(algo=de(), prob=_prob(
                 lambda x, y: x + y), size=2, udi=ipyparallel_island(timeout=to + .3))
             isl.evolve()

From 1c6acf45c818f31965edabc3344af03b7e6eb884 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 18:36:37 +0100
Subject: [PATCH 18/35] Evolve the workaround. [skip appveyor]

---
 tools/install_travis.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index 29afd5595..acfaad7df 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -46,7 +46,11 @@ elif [[ "${PAGMO_BUILD}" == Python* ]]; then
     sleep 20;
     # Move out of the build dir.
     cd ../tools
-    python -c "import pygmo; pygmo.test.run_test_suite(1)";
+    if [[ "${PAGMO_BUILD}" == Python3* ]]; then
+        python -c "import pygmo; pygmo.test.run_test_suite(1)";
+    else
+        python -c "import pygmo; pygmo.test.run_test_suite()";
+    fi
 
     # Additional serialization tests.
     python travis_additional_tests.py;

From 62c3949fc563ec0269e67f8026c00a5398731bb2 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 19:21:39 +0100
Subject: [PATCH 19/35] More WIP [skip appveyor]

---
 tools/install_docker.sh | 2 +-
 tools/install_travis.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/install_docker.sh b/tools/install_docker.sh
index 087317f02..ef8f774bc 100644
--- a/tools/install_docker.sh
+++ b/tools/install_docker.sh
@@ -75,7 +75,7 @@ if [[ ${PAGMO_BUILD} == *27m ]]; then
 	# which will make some tests fail. Just try to import pygmo in this case.
 	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo"
 else
-	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo; pygmo.test.run_test_suite(1)"
+	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo; pygmo.test.run_test_suite(0)"
 fi
 
 # Upload to pypi. This variable will contain something if this is a tagged build (vx.y.z), otherwise it will be empty.
diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index acfaad7df..addc2634e 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -153,7 +153,7 @@ elif [[ "${PAGMO_BUILD}" == OSXPython* ]]; then
     sleep 20;
     # Move out of the build dir.
     cd ../tools
-    python -c "import pygmo; pygmo.test.run_test_suite(1)"
+    python -c "import pygmo; pygmo.test.run_test_suite(0)"
 
     # Additional serialization tests.
     # python travis_additional_tests.py

From 743ad464156370182b5baf5a79a6041e67a996ff Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 20:58:22 +0100
Subject: [PATCH 20/35] Another go [skip appveyor]

---
 tools/install_travis.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index addc2634e..2f5ca43ca 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -136,6 +136,9 @@ elif [[ "${PAGMO_BUILD}" == Python* ]]; then
         fi
     done
 elif [[ "${PAGMO_BUILD}" == OSXPython* ]]; then
+    sysctl -w kern.maxfiles=20480
+    sysctl -w kern.maxfilesperproc=18000
+
     export CXX=clang++
     export CC=clang
     # Install pagmo first.

From f067494e8598a11df583f2008ea5e09e75893268 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 22:08:43 +0100
Subject: [PATCH 21/35] Another try [skip appveyor]

---
 tools/install_travis.sh | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index 2f5ca43ca..83d949395 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -136,8 +136,7 @@ elif [[ "${PAGMO_BUILD}" == Python* ]]; then
         fi
     done
 elif [[ "${PAGMO_BUILD}" == OSXPython* ]]; then
-    sysctl -w kern.maxfiles=20480
-    sysctl -w kern.maxfilesperproc=18000
+    ulimit -S -n 2048
 
     export CXX=clang++
     export CC=clang

From a0411c1d8c9241ea1eb5f14e0391ee0009f32155 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 23:43:13 +0100
Subject: [PATCH 22/35] Add py27 test on circleci. [skip appveyor]

---
 .circleci/config.yml                     | 11 +++-
 tools/circleci_bionic_gcc7_conda_py27.sh | 67 ++++++++++++++++++++++++
 tools/circleci_bionic_gcc7_conda_py38.sh | 22 +++++++-
 3 files changed, 98 insertions(+), 2 deletions(-)
 create mode 100644 tools/circleci_bionic_gcc7_conda_py27.sh

diff --git a/.circleci/config.yml b/.circleci/config.yml
index dd77785c6..e5bb3760b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,6 +9,14 @@ jobs:
     - run:
         name: Build and test
         command: bash ./tools/circleci_bionic_gcc7_conda_py38.sh
+  bionic_gcc7_conda_py27:
+    docker:
+    - image: circleci/buildpack-deps:bionic
+    steps:
+    - checkout
+    - run:
+        name: Build and test
+        command: bash ./tools/circleci_bionic_gcc7_conda_py27.sh
   bionic_gcc7_coverage:
     docker:
     - image: circleci/buildpack-deps:bionic
@@ -46,7 +54,8 @@ workflows:
   version: 2
   all_builds:
     jobs:
-    - bionic_gcc7_conda_py38
+    # - bionic_gcc7_conda_py38
+    - bionic_gcc7_conda_py27
     # - bionic_gcc7_coverage
     # - cosmic_gcc8_asan
     # - cosmic_clang7
diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
new file mode 100644
index 000000000..84a349a2a
--- /dev/null
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+# Echo each command
+set -x
+
+# Exit on error.
+set -e
+
+# Core deps.
+sudo apt-get install build-essential wget
+
+# Install conda+deps.
+wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh
+export deps_dir=$HOME/local
+export PATH="$HOME/miniconda/bin:$PATH"
+export PATH="$deps_dir/bin:$PATH"
+bash miniconda.sh -b -p $HOME/miniconda
+conda config --add channels conda-forge --force
+conda_pkgs="cmake eigen nlopt ipopt boost boost-cpp tbb tbb-devel python=2.7 numpy cloudpickle dill numba pip ipyparallel"
+conda create -q -p $deps_dir -y
+source activate $deps_dir
+conda install $conda_pkgs -y
+
+# Build/install pagmo.
+mkdir build
+cd build
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_TESTS=no -DPAGMO_WITH_EIGEN3=yes -DPAGMO_WITH_NLOPT=yes -DPAGMO_WITH_IPOPT=yes -DBoost_NO_BOOST_CMAKE=ON
+make -j2 VERBOSE=1 install
+
+# Build/install pygmo.
+cd ..
+mkdir build_py
+cd build_py
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DPAGMO_BUILD_PAGMO=no -DPAGMO_BUILD_PYGMO=yes -DBoost_NO_BOOST_CMAKE=ON
+make -j2 VERBOSE=1 install
+
+# Start the ipyparallel cluster.
+ipcluster start --daemonize=True;
+# Give some time for the cluster to start up.
+sleep 20;
+
+# Run the tests.
+cd ../tools
+python -c "import pygmo; pygmo.test.run_test_suite(1); pygmo.mp_island.shutdown_pool()";
+
+# Additional serialization tests.
+python travis_additional_tests.py;
+
+# AP examples.
+cd ../ap_examples/uda_basic;
+mkdir build;
+cd build;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+make install VERBOSE=1;
+cd ../../;
+python test1.py
+
+cd udp_basic;
+mkdir build;
+cd build;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+make install VERBOSE=1;
+cd ../../;
+python test2.py
+
+set +e
+set +x
diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index 2131b5ac7..f070025ba 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -35,8 +35,28 @@ cmake ../ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREF
 make -j2 VERBOSE=1 install
 
 # Run the tests.
-cd /
+cd ../tools
 python -c "import pygmo; pygmo.test.run_test_suite(1); pygmo.mp_island.shutdown_pool()";
 
+# Additional serialization tests.
+python travis_additional_tests.py;
+
+# AP examples.
+cd ../ap_examples/uda_basic;
+mkdir build;
+cd build;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+make install VERBOSE=1;
+cd ../../;
+python test1.py
+
+cd udp_basic;
+mkdir build;
+cd build;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+make install VERBOSE=1;
+cd ../../;
+python test2.py
+
 set +e
 set +x

From 325f3e128fba8119c383dc23188abb256a531beb Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Fri, 6 Dec 2019 23:50:14 +0100
Subject: [PATCH 23/35] Evolving the implementation. [skip appveyor]

---
 tools/circleci_bionic_gcc7_conda_py27.sh | 2 +-
 tools/install_docker.sh                  | 2 +-
 tools/install_travis.sh                  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
index 84a349a2a..4ea36f908 100644
--- a/tools/circleci_bionic_gcc7_conda_py27.sh
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -41,7 +41,7 @@ sleep 20;
 
 # Run the tests.
 cd ../tools
-python -c "import pygmo; pygmo.test.run_test_suite(1); pygmo.mp_island.shutdown_pool()";
+python -c "import pygmo; pygmo.test.run_test_suite(); pygmo.mp_island.shutdown_pool()";
 
 # Additional serialization tests.
 python travis_additional_tests.py;
diff --git a/tools/install_docker.sh b/tools/install_docker.sh
index ef8f774bc..81a9dc053 100644
--- a/tools/install_docker.sh
+++ b/tools/install_docker.sh
@@ -75,7 +75,7 @@ if [[ ${PAGMO_BUILD} == *27m ]]; then
 	# which will make some tests fail. Just try to import pygmo in this case.
 	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo"
 else
-	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo; pygmo.test.run_test_suite(0)"
+	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo; pygmo.test.run_test_suite()"
 fi
 
 # Upload to pypi. This variable will contain something if this is a tagged build (vx.y.z), otherwise it will be empty.
diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index 83d949395..95b5993f5 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -155,7 +155,7 @@ elif [[ "${PAGMO_BUILD}" == OSXPython* ]]; then
     sleep 20;
     # Move out of the build dir.
     cd ../tools
-    python -c "import pygmo; pygmo.test.run_test_suite(0)"
+    python -c "import pygmo; pygmo.test.run_test_suite()"
 
     # Additional serialization tests.
     # python travis_additional_tests.py

From fbe191984d384c90e49e57aa963926416750988e Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 00:02:11 +0100
Subject: [PATCH 24/35] More verbosity. [skip appveyor]

---
 tools/travis_additional_tests.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/travis_additional_tests.py b/tools/travis_additional_tests.py
index 37aec415f..8c7ba045a 100644
--- a/tools/travis_additional_tests.py
+++ b/tools/travis_additional_tests.py
@@ -38,6 +38,7 @@ def test1():
     archi = pg.archipelago(n=6, algo=algo, prob=prob, pop_size=70)
     archi.evolve()
     archi.wait_check()
+    print("end of test1")
 
 
 def test2():
@@ -46,6 +47,7 @@ def test2():
     archi = pg.archipelago(n=6, algo=mma, prob=p_toy, pop_size=1)
     archi.evolve()
     archi.wait_check()
+    print("end of test2")
 
 
 if __name__ == '__main__':

From ab39946a3d085148aa2c21857ce4d13eefca1394 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 00:23:18 +0100
Subject: [PATCH 25/35] More debug.

---
 .circleci/config.yml                     | 2 +-
 tools/circleci_bionic_gcc7_conda_py27.sh | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index e5bb3760b..399b0a67f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -54,7 +54,7 @@ workflows:
   version: 2
   all_builds:
     jobs:
-    # - bionic_gcc7_conda_py38
+    - bionic_gcc7_conda_py38
     - bionic_gcc7_conda_py27
     # - bionic_gcc7_coverage
     # - cosmic_gcc8_asan
diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
index 4ea36f908..6c89524e4 100644
--- a/tools/circleci_bionic_gcc7_conda_py27.sh
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -41,6 +41,9 @@ sleep 20;
 
 # Run the tests.
 cd ../tools
+ipcluster stop
+ipcluster start --daemonize=True;
+sleep 20;
 python -c "import pygmo; pygmo.test.run_test_suite(); pygmo.mp_island.shutdown_pool()";
 
 # Additional serialization tests.

From ba6316988470df146e50be8100ad8a459a29b990 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 00:33:52 +0100
Subject: [PATCH 26/35] More WIP [skip appveyor]

---
 tools/circleci_bionic_gcc7_conda_py27.sh | 10 +++++-----
 tools/circleci_bionic_gcc7_conda_py38.sh |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
index 6c89524e4..31b5e654e 100644
--- a/tools/circleci_bionic_gcc7_conda_py27.sh
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -41,19 +41,19 @@ sleep 20;
 
 # Run the tests.
 cd ../tools
-ipcluster stop
-ipcluster start --daemonize=True;
-sleep 20;
 python -c "import pygmo; pygmo.test.run_test_suite(); pygmo.mp_island.shutdown_pool()";
 
 # Additional serialization tests.
+ipcluster stop
+ipcluster start --daemonize=True;
+sleep 20;
 python travis_additional_tests.py;
 
 # AP examples.
 cd ../ap_examples/uda_basic;
 mkdir build;
 cd build;
-cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../ -DBoost_NO_BOOST_CMAKE=ON;
 make install VERBOSE=1;
 cd ../../;
 python test1.py
@@ -61,7 +61,7 @@ python test1.py
 cd udp_basic;
 mkdir build;
 cd build;
-cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../ -DBoost_NO_BOOST_CMAKE=ON;
 make install VERBOSE=1;
 cd ../../;
 python test2.py
diff --git a/tools/circleci_bionic_gcc7_conda_py38.sh b/tools/circleci_bionic_gcc7_conda_py38.sh
index f070025ba..09a8e6448 100644
--- a/tools/circleci_bionic_gcc7_conda_py38.sh
+++ b/tools/circleci_bionic_gcc7_conda_py38.sh
@@ -45,7 +45,7 @@ python travis_additional_tests.py;
 cd ../ap_examples/uda_basic;
 mkdir build;
 cd build;
-cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug -DBoost_NO_BOOST_CMAKE=ON ../;
 make install VERBOSE=1;
 cd ../../;
 python test1.py
@@ -53,7 +53,7 @@ python test1.py
 cd udp_basic;
 mkdir build;
 cd build;
-cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug ../;
+cmake -DCMAKE_INSTALL_PREFIX=$deps_dir -DCMAKE_PREFIX_PATH=$deps_dir -DCMAKE_BUILD_TYPE=Debug -DBoost_NO_BOOST_CMAKE=ON ../;
 make install VERBOSE=1;
 cd ../../;
 python test2.py

From 722a83174a3cacbd57a7075ea866ab9869d4db79 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 00:50:40 +0100
Subject: [PATCH 27/35] More WIP. [skip appveyor]

---
 tools/circleci_bionic_gcc7_conda_py27.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
index 31b5e654e..18de03b5e 100644
--- a/tools/circleci_bionic_gcc7_conda_py27.sh
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -45,6 +45,7 @@ python -c "import pygmo; pygmo.test.run_test_suite(); pygmo.mp_island.shutdown_p
 
 # Additional serialization tests.
 ipcluster stop
+sleep 20;
 ipcluster start --daemonize=True;
 sleep 20;
 python travis_additional_tests.py;

From 28382f6d35c9df0602f2f20a986813d31dcf4846 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 01:04:00 +0100
Subject: [PATCH 28/35] More WIP. [skip appveyor]

---
 tools/travis_additional_tests.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/travis_additional_tests.py b/tools/travis_additional_tests.py
index 8c7ba045a..a1db5bde2 100644
--- a/tools/travis_additional_tests.py
+++ b/tools/travis_additional_tests.py
@@ -53,3 +53,4 @@ def test2():
 if __name__ == '__main__':
     test1()
     test2()
+    pg.mp_island.shutdown_pool()

From dcea925fd61c7d3bd9b356901e3620a1bdeb9327 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 01:16:28 +0100
Subject: [PATCH 29/35] More debug. [skip appveyor]

---
 pygmo/core.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pygmo/core.cpp b/pygmo/core.cpp
index d817fbaf4..cb857965f 100644
--- a/pygmo/core.cpp
+++ b/pygmo/core.cpp
@@ -190,6 +190,8 @@ bp::object test_object_serialization(const bp::object &o)
 // supermodule gets unloaded).
 void cleanup()
 {
+    std::cout << "starting C++ cleanup\n";
+
     problem_ptr.reset();
 
     algorithm_ptr.reset();
@@ -203,6 +205,8 @@ void cleanup()
     r_policy_ptr.reset();
 
     s_policy_ptr.reset();
+
+    std::cout << "C++ cleanup completed\n";
 }
 
 // Serialization support for the population class.

From b92bad7c24c857fb4f6585f6e1c9adff6db3bbb4 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 02:20:16 +0100
Subject: [PATCH 30/35] More tries [skip appveyor]

---
 pygmo/core.cpp                   |  4 ----
 tools/travis_additional_tests.py | 12 ++++++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/pygmo/core.cpp b/pygmo/core.cpp
index cb857965f..d817fbaf4 100644
--- a/pygmo/core.cpp
+++ b/pygmo/core.cpp
@@ -190,8 +190,6 @@ bp::object test_object_serialization(const bp::object &o)
 // supermodule gets unloaded).
 void cleanup()
 {
-    std::cout << "starting C++ cleanup\n";
-
     problem_ptr.reset();
 
     algorithm_ptr.reset();
@@ -205,8 +203,6 @@ void cleanup()
     r_policy_ptr.reset();
 
     s_policy_ptr.reset();
-
-    std::cout << "C++ cleanup completed\n";
 }
 
 // Serialization support for the population class.
diff --git a/tools/travis_additional_tests.py b/tools/travis_additional_tests.py
index a1db5bde2..7e59df958 100644
--- a/tools/travis_additional_tests.py
+++ b/tools/travis_additional_tests.py
@@ -1,32 +1,35 @@
-import pygmo as pg
-import numpy as np
-
-
 # NOTE: a couple of serialization tests from:
 # https://github.com/esa/pagmo2/issues/106
 
+
 class toy_problem:
 
     def fitness(self, x):
+        import numpy as np
         return [np.sum(np.sin((x - .2)**2))]
 
     def get_bounds(self):
+        import numpy as np
         return (np.array([-1] * 3), np.array([1] * 3))
 
 
 class toy_problem_2:
 
     def fitness(self, x):
+        import numpy as np
         return [np.sin(x[0] + x[1] - x[2])]
 
     def gradient(self, x):
+        import pygmo as pg
         return pg.estimate_gradient(lambda x: self.fitness(x), x)
 
     def get_bounds(self):
+        import numpy as np
         return (np.array([-1] * 3), np.array([1] * 3))
 
 
 def test1():
+    import pygmo as pg
     algo = pg.algorithm(pg.de(gen=1000, seed=126))
     prob = pg.problem(toy_problem())
     pop = pg.population(prob=prob, size=10)
@@ -42,6 +45,7 @@ def test1():
 
 
 def test2():
+    import pygmo as pg
     mma = pg.algorithm(pg.nlopt("mma"))
     p_toy = pg.problem(toy_problem_2())
     archi = pg.archipelago(n=6, algo=mma, prob=p_toy, pop_size=1)

From 72022c459143e897f33065d66f3dd4efdf82b5a6 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 02:34:16 +0100
Subject: [PATCH 31/35] Partially revert.

---
 tools/travis_additional_tests.py | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/tools/travis_additional_tests.py b/tools/travis_additional_tests.py
index 7e59df958..a1db5bde2 100644
--- a/tools/travis_additional_tests.py
+++ b/tools/travis_additional_tests.py
@@ -1,35 +1,32 @@
+import pygmo as pg
+import numpy as np
+
+
 # NOTE: a couple of serialization tests from:
 # https://github.com/esa/pagmo2/issues/106
 
-
 class toy_problem:
 
     def fitness(self, x):
-        import numpy as np
         return [np.sum(np.sin((x - .2)**2))]
 
     def get_bounds(self):
-        import numpy as np
         return (np.array([-1] * 3), np.array([1] * 3))
 
 
 class toy_problem_2:
 
     def fitness(self, x):
-        import numpy as np
         return [np.sin(x[0] + x[1] - x[2])]
 
     def gradient(self, x):
-        import pygmo as pg
         return pg.estimate_gradient(lambda x: self.fitness(x), x)
 
     def get_bounds(self):
-        import numpy as np
         return (np.array([-1] * 3), np.array([1] * 3))
 
 
 def test1():
-    import pygmo as pg
     algo = pg.algorithm(pg.de(gen=1000, seed=126))
     prob = pg.problem(toy_problem())
     pop = pg.population(prob=prob, size=10)
@@ -45,7 +42,6 @@ def test1():
 
 
 def test2():
-    import pygmo as pg
     mma = pg.algorithm(pg.nlopt("mma"))
     p_toy = pg.problem(toy_problem_2())
     archi = pg.archipelago(n=6, algo=mma, prob=p_toy, pop_size=1)

From 47d9d6f97830fdb943cd168ec469048e91e45a11 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 16:08:05 +0100
Subject: [PATCH 32/35] Try another ipyparallel_island approach.

---
 pygmo/__init__.py     |   1 +
 pygmo/_island_test.py |  20 ++++---
 pygmo/_py_islands.py  | 122 +++++++++++++++++++++++++-----------------
 3 files changed, 88 insertions(+), 55 deletions(-)

diff --git a/pygmo/__init__.py b/pygmo/__init__.py
index 7cc0aa7ad..a1ae9196d 100644
--- a/pygmo/__init__.py
+++ b/pygmo/__init__.py
@@ -837,6 +837,7 @@ def get_serialization_backend():
 
 def _cleanup():
     mp_island.shutdown_pool()
+    ipyparallel_island.shutdown_view()
     _cpp_cleanup()
 
 
diff --git a/pygmo/_island_test.py b/pygmo/_island_test.py
index ba658af5c..b2f68dcbd 100644
--- a/pygmo/_island_test.py
+++ b/pygmo/_island_test.py
@@ -612,18 +612,24 @@ def run_basic_tests(self):
         from . import ipyparallel_island
         from copy import copy, deepcopy
         from pickle import dumps, loads
+
+        ipyparallel_island.shutdown_view()
+        ipyparallel_island.shutdown_view()
+        ipyparallel_island.shutdown_view()
+
         to = .5
+        isl = island(algo=de(), prob=rosenbrock(),
+                     size=25, udi=ipyparallel_island())
+        ipyparallel_island.shutdown_view()
         try:
-            isl = island(algo=de(), prob=rosenbrock(),
-                         size=25, udi=ipyparallel_island(timeout=to))
+            ipyparallel_island.init_view(timeout=to)
         except OSError:
             return
         isl = island(algo=de(), prob=rosenbrock(),
-                     size=25, udi=ipyparallel_island(timeout=to))
-        isl = island(algo=de(), prob=rosenbrock(),
-                     size=25, udi=ipyparallel_island(timeout=to + .3))
+                     size=25, udi=ipyparallel_island())
         self.assertEqual(isl.get_name(), "Ipyparallel island")
         self.assertTrue(isl.get_extra_info() != "")
+        ipyparallel_island.shutdown_view()
         isl.evolve(20)
         isl.wait_check()
         isl.evolve(20)
@@ -632,7 +638,7 @@ def run_basic_tests(self):
 
         # Check the picklability of a problem storing a lambda.
         isl = island(algo=de(), prob=_prob(lambda x, y: x + y),
-                     size=25, udi=ipyparallel_island(timeout=to + .3))
+                     size=25, udi=ipyparallel_island())
         isl.evolve()
         isl.wait_check()
 
@@ -670,7 +676,7 @@ def run_basic_tests(self):
         # Check exception transport.
         for _ in range(10):
             isl = island(algo=de(), prob=_prob(
-                lambda x, y: x + y), size=2, udi=ipyparallel_island(timeout=to + .3))
+                lambda x, y: x + y), size=2, udi=ipyparallel_island())
             isl.evolve()
             isl.wait()
             self.assertTrue("**error occurred**" in repr(isl))
diff --git a/pygmo/_py_islands.py b/pygmo/_py_islands.py
index 0342d54bc..59884b33d 100644
--- a/pygmo/_py_islands.py
+++ b/pygmo/_py_islands.py
@@ -455,11 +455,11 @@ class ipyparallel_island(object):
     """Ipyparallel island.
 
     This user-defined island (UDI) will dispatch evolution tasks to an ipyparallel cluster.
-    Upon construction, an instance of this UDI will first initialise an :class:`ipyparallel.Client`
-    object, and then extract an :class:`ipyparallel.LoadBalancedView` object from it that will
-    be used to submit evolution tasks to the cluster. The arguments to the constructor of this
-    class will be passed without modifications to the constructor of the :class:`ipyparallel.Client`
-    object that will be created internally.
+    The communication with the cluster is managed via an :class:`ipyparallel.LoadBalancedView`
+    instance which is created either implicitly when the first evolution is run, or explicitly
+    via the :func:`~pygmo.ipyparallel_island.init_view()` method. The
+    :class:`~ipyparallel.LoadBalancedView` instance is unique and shared among all the
+    ipyparallel islands.
 
     .. seealso::
 
@@ -467,59 +467,76 @@ class will be passed without modifications to the constructor of the :class:`ipy
 
     """
 
-    def __init__(self, *args, **kwargs):
-        self._lview = self._init(*args, **kwargs)
+    # Static variables for the view.
+    _view_lock = _Lock()
+    _view = None
 
-    def _init(self, *args, **kwargs):
-        # A small helper function which will do the following:
-        # * create a new client from scratch,
-        # * store a copy of the input arguments as class members,
-        # * create a LoadBalancedView from the client,
-        # * create a lock to regulate access to the view,
-        # * return the view.
-        from ipyparallel import Client
-        from copy import deepcopy
+    def __init__(self):
+        pass
 
-        # Save the init arguments.
-        self._args = deepcopy(args)
-        self._kwargs = deepcopy(kwargs)
+    @staticmethod
+    def init_view(*args, **kwargs):
+        """Init the ipyparallel view.
+
+        .. versionadded:: 2.12
+
+        This method will initialise the :class:`ipyparallel.LoadBalancedView`
+        which is used by all ipyparallel islands to submit the evolution tasks
+        to an ipyparallel cluster. The input arguments are forwarded
+        to the construction of an :class:`ipyparallel.Client` instance,
+        from which the :class:`~ipyparallel.LoadBalancedView` instance
+        is then fetched via the :func:`ipyparallel.Client.load_balanced_view()`
+        method.
+
+        Note that usually it is not necessary to explicitly invoke this
+        method: a :class:`~ipyparallel.LoadBalancedView` is automatically
+        constructed with default settings the first time an evolution task
+        is submitted to an ipyparallel island. This method should be used
+        only if it is necessary to pass custom arguments to the construction
+        of the :class:`~ipyparallel.Client` object from which the
+        :class:`~ipyparallel.LoadBalancedView` is fetched.
 
-        # Create the client.
-        rc = Client(*args, **kwargs)
+        Raises:
 
-        # NOTE: we need to regulate access to the view because,
-        # while run_evolve() is running in a separate thread, we
-        # could be doing other things involving the view (e.g.,
-        # asking extra_info()). Thus, create the lock here.
-        self._view_lock = _Lock()
+           unspecified: any exception thrown by the constructor of :class:`~ipyparallel.Client`
 
-        return rc.load_balanced_view()
+        """
+        from ipyparallel import Client
+        with ipyparallel_island._view_lock:
+            ipyparallel_island._view = Client(
+                *args, **kwargs).load_balanced_view()
 
-    def __copy__(self):
-        # For copy/deepcopy, construct a new instance
-        # with the same arguments used to construct self.
-        return ipyparallel_island(*self._args, **self._kwargs)
+    @staticmethod
+    def shutdown_view():
+        """Destroy the ipyparallel view.
 
-    def __deepcopy__(self, d):
-        return self.__copy__()
+        .. versionadded:: 2.12
 
-    def __getstate__(self):
-        # For pickle/unpickle, we employ the construction
-        # arguments, which will be used to re-init the class
-        # during unpickle.
-        from copy import deepcopy
-        return deepcopy(self._args), deepcopy(self._kwargs)
+        This method will destroy the :class:`ipyparallel.LoadBalancedView`
+        currently being used by the ipyparallel islands for submitting
+        evolution tasks to an ipyparallel cluster. The view can be re-inited
+        implicitly by submitting a new evolution task, or by invoking
+        the :func:`~pygmo.ipyparallel_island.init_view()` method.
 
-    def __setstate__(self, state):
-        self._lview = self._init(*state[0], **state[1])
+        """
+        import gc
+        with ipyparallel_island._view_lock:
+            if ipyparallel_island._view is None:
+                return
+
+            old_view = ipyparallel_island._view
+            ipyparallel_island._view = None
+            del(old_view)
+            gc.collect()
 
     def run_evolve(self, algo, pop):
         """Evolve population.
 
         This method will evolve the input :class:`~pygmo.population` *pop* using the input
         :class:`~pygmo.algorithm` *algo*, and return *algo* and the evolved population. The evolution
-        task is submitted to the ipyparallel cluster via an internal :class:`ipyparallel.LoadBalancedView`
-        instance initialised during the construction of the island.
+        task is submitted to the ipyparallel cluster via a global :class:`ipyparallel.LoadBalancedView`
+        instance initialised either implicitly by the first invocation of this method,
+        or by an explicit call to the :func:`~pygmo.ipyparallel_island.init_view()` method.
 
         Args:
 
@@ -532,7 +549,8 @@ def run_evolve(self, algo, pop):
 
         Raises:
 
-            unspecified: any exception thrown during the evolution, or by submitting the evolution task
+            unspecified: any exception thrown by the evolution, by the creation of a
+              :class:`ipyparallel.LoadBalancedView`, or by the sumission of the evolution task
               to the ipyparallel cluster
 
 
@@ -542,8 +560,13 @@ def run_evolve(self, algo, pop):
         # serialization errors early.
         import pickle
         ser_algo_pop = pickle.dumps((algo, pop))
-        with self._view_lock:
-            ret = self._lview.apply_async(_evolve_func_ipy, ser_algo_pop)
+        with ipyparallel_island._view_lock:
+            if ipyparallel_island._view is None:
+                from ipyparallel import Client
+                ipyparallel_island._view = Client().load_balanced_view()
+            ret = ipyparallel_island._view.apply_async(
+                _evolve_func_ipy, ser_algo_pop)
+
         return pickle.loads(ret.get())
 
     def get_name(self):
@@ -563,6 +586,9 @@ def get_extra_info(self):
 
         """
         from copy import deepcopy
-        with self._view_lock:
-            d = deepcopy(self._lview.queue_status())
+        with ipyparallel_island._view_lock:
+            if ipyparallel_island._view is None:
+                return "\tNo cluster view has been created yet"
+            else:
+                d = deepcopy(ipyparallel_island._view.queue_status())
         return "\tQueue status:\n\t\n\t" + "\n\t".join(["(" + str(k) + ", " + str(d[k]) + ")" for k in d])

From 35178f647990fadf06198513b2ba76bc613af828 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 18:28:05 +0100
Subject: [PATCH 33/35] More WIP, re-enable builds.

---
 .circleci/config.yml                     |  8 ++++----
 .travis.yml                              | 11 -----------
 ap_examples/test1.py                     |  1 +
 ap_examples/test2.py                     |  1 +
 tools/circleci_bionic_gcc7_conda_py27.sh |  2 +-
 tools/install_deps.sh                    |  2 +-
 tools/install_docker.sh                  |  2 +-
 tools/install_travis.sh                  | 12 ++----------
 8 files changed, 11 insertions(+), 28 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 399b0a67f..7d1a8af0c 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -56,7 +56,7 @@ workflows:
     jobs:
     - bionic_gcc7_conda_py38
     - bionic_gcc7_conda_py27
-    # - bionic_gcc7_coverage
-    # - cosmic_gcc8_asan
-    # - cosmic_clang7
-    # - bionic_clang6_release
+    - bionic_gcc7_coverage
+    - cosmic_gcc8_asan
+    - cosmic_clang7
+    - bionic_clang6_release
diff --git a/.travis.yml b/.travis.yml
index 77cb3e313..84d38a60d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,17 +51,6 @@ matrix:
           packages:
           - gcc-4.8
           - g++-4.8
-    - env: PAGMO_BUILD="Python27"
-      dist: trusty
-      compiler: gcc
-      os: linux
-      addons:
-        apt:
-          sources:
-          - ubuntu-toolchain-r-test
-          packages:
-          - gcc-4.8
-          - g++-4.8
     - env: PAGMO_BUILD="OSXDebug"
       os: osx
       osx_image: xcode6.4
diff --git a/ap_examples/test1.py b/ap_examples/test1.py
index 33d827939..cd3554377 100644
--- a/ap_examples/test1.py
+++ b/ap_examples/test1.py
@@ -26,4 +26,5 @@ def fitness(self, a):
     isl = pygmo.island(algo=ub, prob=py_udp(), size=20)
     isl.evolve()
     isl.wait_check()
+    pygmo.mp_island.shutdown_pool()
     print("All good!")
diff --git a/ap_examples/test2.py b/ap_examples/test2.py
index f2a428004..a533e37cb 100644
--- a/ap_examples/test2.py
+++ b/ap_examples/test2.py
@@ -24,4 +24,5 @@ def evolve(self, pop):
     isl = pygmo.island(algo=py_uda(), prob=ub, size=20)
     isl.evolve()
     isl.wait_check()
+    pygmo.mp_island.shutdown_pool()
     print("All good!")
diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
index 18de03b5e..5ddd4baee 100644
--- a/tools/circleci_bionic_gcc7_conda_py27.sh
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -41,7 +41,7 @@ sleep 20;
 
 # Run the tests.
 cd ../tools
-python -c "import pygmo; pygmo.test.run_test_suite(); pygmo.mp_island.shutdown_pool()";
+python -c "import pygmo; pygmo.test.run_test_suite(1); pygmo.mp_island.shutdown_pool()";
 
 # Additional serialization tests.
 ipcluster stop
diff --git a/tools/install_deps.sh b/tools/install_deps.sh
index 96c8fc50e..f5c72dee5 100755
--- a/tools/install_deps.sh
+++ b/tools/install_deps.sh
@@ -21,7 +21,7 @@ if [[ "${PAGMO_BUILD}" != manylinux* ]]; then
 
     if [[ "${PAGMO_BUILD}" == "Python37" || "${PAGMO_BUILD}" == "OSXPython37" ]]; then
         conda_pkgs="$conda_pkgs python=3.7 numpy cloudpickle dill ipyparallel numba pip"
-    elif [[ "${PAGMO_BUILD}" == "Python27" || "${PAGMO_BUILD}" == "OSXPython27" ]]; then
+    elif [[ "${PAGMO_BUILD}" == "OSXPython27" ]]; then
         conda_pkgs="$conda_pkgs python=2.7 numpy cloudpickle dill ipyparallel numba"
     fi
 
diff --git a/tools/install_docker.sh b/tools/install_docker.sh
index 81a9dc053..087317f02 100644
--- a/tools/install_docker.sh
+++ b/tools/install_docker.sh
@@ -75,7 +75,7 @@ if [[ ${PAGMO_BUILD} == *27m ]]; then
 	# which will make some tests fail. Just try to import pygmo in this case.
 	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo"
 else
-	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo; pygmo.test.run_test_suite()"
+	/opt/python/${PYTHON_DIR}/bin/python -c "import pygmo; pygmo.test.run_test_suite(1)"
 fi
 
 # Upload to pypi. This variable will contain something if this is a tagged build (vx.y.z), otherwise it will be empty.
diff --git a/tools/install_travis.sh b/tools/install_travis.sh
index 95b5993f5..2fd17c26f 100755
--- a/tools/install_travis.sh
+++ b/tools/install_travis.sh
@@ -46,11 +46,7 @@ elif [[ "${PAGMO_BUILD}" == Python* ]]; then
     sleep 20;
     # Move out of the build dir.
     cd ../tools
-    if [[ "${PAGMO_BUILD}" == Python3* ]]; then
-        python -c "import pygmo; pygmo.test.run_test_suite(1)";
-    else
-        python -c "import pygmo; pygmo.test.run_test_suite()";
-    fi
+    python -c "import pygmo; pygmo.test.run_test_suite(1)";
 
     # Additional serialization tests.
     python travis_additional_tests.py;
@@ -71,10 +67,6 @@ elif [[ "${PAGMO_BUILD}" == Python* ]]; then
     make install VERBOSE=1;
     cd ../../;
     python test2.py
-    if [[ "${PAGMO_BUILD}" == "Python27" ]]; then
-        # Stop here if this is the Python27 build. Docs are produced and uploaded only in the Python37 build.
-        exit 0;
-    fi
 
     # Documentation.
     cd ../build
@@ -155,7 +147,7 @@ elif [[ "${PAGMO_BUILD}" == OSXPython* ]]; then
     sleep 20;
     # Move out of the build dir.
     cd ../tools
-    python -c "import pygmo; pygmo.test.run_test_suite()"
+    python -c "import pygmo; pygmo.test.run_test_suite(1)"
 
     # Additional serialization tests.
     # python travis_additional_tests.py

From e6c83345c8eb699a048b260825953e6c2007d6e3 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 18:41:55 +0100
Subject: [PATCH 34/35] More cleanup. [skip appveyor]

---
 tools/circleci_bionic_gcc7_conda_py27.sh | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/tools/circleci_bionic_gcc7_conda_py27.sh b/tools/circleci_bionic_gcc7_conda_py27.sh
index 5ddd4baee..58a7c02f2 100644
--- a/tools/circleci_bionic_gcc7_conda_py27.sh
+++ b/tools/circleci_bionic_gcc7_conda_py27.sh
@@ -44,10 +44,6 @@ cd ../tools
 python -c "import pygmo; pygmo.test.run_test_suite(1); pygmo.mp_island.shutdown_pool()";
 
 # Additional serialization tests.
-ipcluster stop
-sleep 20;
-ipcluster start --daemonize=True;
-sleep 20;
 python travis_additional_tests.py;
 
 # AP examples.

From ac2f36916271b5bcd59610861ac63a0eb4b8e2f7 Mon Sep 17 00:00:00 2001
From: Francesco Biscani <bluescarni@gmail.com>
Date: Sat, 7 Dec 2019 22:44:13 +0100
Subject: [PATCH 35/35] Small doc fix, changelog update.

---
 doc/sphinx/changelog.rst                 |  9 +++++
 doc/sphinx/docs/cpp/algorithms/nspso.rst | 44 ++++++++++++++----------
 2 files changed, 35 insertions(+), 18 deletions(-)

diff --git a/doc/sphinx/changelog.rst b/doc/sphinx/changelog.rst
index a7101fee6..7e2705313 100644
--- a/doc/sphinx/changelog.rst
+++ b/doc/sphinx/changelog.rst
@@ -18,6 +18,15 @@ New
 - Implement the NSPSO algorithm
   (`#314 <https://github.com/esa/pagmo2/pull/314>`__).
 
+Changes
+~~~~~~~
+
+- **BREAKING**: the mechanism for managing the
+  interaction of an :class:`~pygmo.ipyparallel_island`
+  with an ipyparallel cluster has changed. Please refer
+  to the documentation for details
+  (`#368 <https://github.com/esa/pagmo2/pull/368>`__).
+
 Fix
 ~~~
 
diff --git a/doc/sphinx/docs/cpp/algorithms/nspso.rst b/doc/sphinx/docs/cpp/algorithms/nspso.rst
index a229683f4..23bf6fb48 100644
--- a/doc/sphinx/docs/cpp/algorithms/nspso.rst
+++ b/doc/sphinx/docs/cpp/algorithms/nspso.rst
@@ -58,24 +58,32 @@ Non dominated sorting particle swarm optimization(NSPSO)
 
    .. cpp:function:: void set_verbosity(unsigned level)
 
-      Sets the algorithm verbosity: sets the verbosity level of the screen ouput and of the log returned by ``get_log()`. *level* can be: 
-      - 0: no verbosity.
-      - >0: will print and log one line each *level* generations.
-      Example (verbosity 1, where Gen, is the generation number, Fevals the number of function evaluations used; also, the ideal point of the current population follows cropped to its 5th component):
-   .. code-block:: c++
-      :linenos:
-
-      Gen:        Fevals:        ideal1:        ideal2:        ideal3:        ideal4:        ideal5:          ... :
-         1             52      0.0586347      0.0587097      0.0586892      0.0592426      0.0614239
-         2            104     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         3            156     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         4            208     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         5            260     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         6            312     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         7            364     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         8            416     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-         9            468     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
-        10            520     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+      Sets the algorithm verbosity: sets the verbosity level
+      of the screen ouput and of the log returned by ``get_log()``.
+      *level* can be:
+
+      * 0: no verbosity.
+      * >0: will print and log one line each *level* generations.
+
+      Example (verbosity 1, where Gen, is the generation number,
+      Fevals the number of function evaluations used; also, the
+      ideal point of the current population follows cropped to its
+      5th component):
+
+      .. code-block:: c++
+         :linenos:
+
+         Gen:        Fevals:        ideal1:        ideal2:        ideal3:        ideal4:        ideal5:          ... :
+            1             52      0.0586347      0.0587097      0.0586892      0.0592426      0.0614239
+            2            104     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            3            156     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            4            208     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            5            260     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            6            312     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            7            364     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            8            416     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+            9            468     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
+           10            520     0.00899252     0.00899395     0.00945782      0.0106282      0.0276778
 
    .. cpp:function:: unsigned get_verbosity() const