README.md: fix build/run instructions (#250)

* README.md: fix build/run instructions 

Fix build and run instructions, put information at the top.

* README.md: fix install dir, revert unrelated changes

* Update README.md

Co-authored-by: Daniel Arndt <[email protected]>

* Update README.md: remove output file mention

Co-authored-by: Daniel Arndt <[email protected]>

* Update README.md

Co-authored-by: Daniel Arndt <[email protected]>

---------

Co-authored-by: Daniel Arndt <[email protected]>
Co-authored-by: Christian Trott <[email protected]>

README.md

@@ -8,12 +8,38 @@ Note: `Kokkos` must be configured with `Kokkos_ENABLE_LIBDL=ON` to load profilin
 
 ## General Usage
 
-To use one of the tools you have to compile it, which will generate a dynamic library. Before executing the Kokkos application you then have to set the environment variable `KOKKOS_TOOLS_LIBS` to point to the dynamic library e.g. in the `bash` shell:
-```
-export KOKKOS_TOOLS_LIBS=${HOME}/kokkos-tools/src/tools/memory-events/kp_memory_event.so
-```
+To use one of the tools you have to compile it, which will generate a dynamic library. Before executing the Kokkos application you then have to set the environment variable `KOKKOS_TOOLS_LIBS` to point to the dynamic library.
+
+CMake and Makefiles are supported for building Kokkos Tools. The following provides instructions for both.
+
+## Using cmake 
+
+### Build
+
+1. Create a build directory in Kokkos Tools, e.g., type `mkdir myBuild; cd myBuild`
+2. To configure, type `cmake .. -DCMAKE_INSTALL_PREFIX=${YOUR_KOKKOS_TOOLS_INSTALL_DIR}`. There are more options but in most cases the defaults are sufficient.
+3. To compile, type `make`
+4. To install, type `make install`
+
+### Run 
+
+Given your installed tool shared library `lib<name_of_tool_shared_lib>.so` and an application executable called yourApplication.exe, type: 
+
+`export KOKKOS_TOOLS_LIBS=${YOUR_KOKKOS_TOOLS_INSTALL_DIR}/lib<name_of_tool_shared_lib>.so; ./yourApplication.exe`
+
+
+## Using make
+
+### Build
+
+To build some library `<name_of_tool_shared_lib>` with make, simply type `make` within that library's subdirectory `${YOUR_KOKKOS_TOOLS_LIB_SRC_DIR}` of Kokkos Tools. This generates the shared library within that subdirectory. 
+
+### Run 
+
+Given your installed tool shared library `<name_of_tool_shared_lib>.so` and an application executable called `yourApplication.exe`, type: 
+
+`export KOKKOS_TOOLS_LIBS=${YOUR_KOKKOS_TOOLS_LIB_SRC_DIR}/<name_of_tool_shared_lib>.so; ./yourApplication.exe`
 
-Many of the tools will produce an output file that uses the hostname as well as the process id as part of the filename. 
 
 ## Explicit Instrumentation
 
@@ -88,30 +114,6 @@ The following provides an overview of the tools available in the set of Kokkos T
     accumulate statistics, and utilize various portable function calls for common needs w.r.t. timers,
     resource usage, etc. 
 
-# Building Kokkos Tools
-
-Use either CMake or Makefile to build Kokkos Tools. 
-
-## Using cmake
-
-1. create a build directory in Kokkos Tools, e.g., type `mkdir myBuild; cd myBuild` 
-2. To configure the Type `ccmake ..`  for any options you would like to enable/disable. 
-3. To compile, type `make`
-4. To install, type `make install`
-
-## Using make
-
-To build with make, simply type `make` within each subdirectory of Kokkos Tools. 
-
-
-Building using `make` is currently recommended. Eventually, the preferred method of building will be `cmake`.  
-
-# Running a Kokkos-based Application with a tool
-
-Given your tool shared library `<name_of_tool_shared_library>.so` (which contains kokkos profiling callback functions) and an application executable called yourApplication.exe, type: 
-
-`export KOKKOS_TOOLS_LIBS=${YOUR_KOKKOS_TOOLS_DIR}/<name_of_tool_shared_lib>; ./yourApplication.exe`  
-
 # Tutorial
 
 A tutorial on Kokkos Tools can be found here: https://github.com/kokkos/kokkos-tutorials/blob/main/LectureSeries/KokkosTutorial_07_Tools.pdf