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rapi

Overview

Summary

This system is a job scheduler that works cooperatively with MPI programs, and consists of below three programs.

  • rapi works with MPI programs using MPI profiling interface.
  • rapid manages MPI programs.
  • rapictld manages all rapid.

How cooperative?

  1. Rapi sends MPI program information such as "whether is interactive" or "how to stop" This allows job scheduler more flexible job management.
  2. Rapi sends MPI program's running state such as "Now enter MPI_Send function" This allows job scheduler to adjust the timing to suspend/resume jobs.

Build and Install

  1. Clone this repository 
    git clone https://github.com/nomlab/rapi.git && cd rapi
  2. Build 
    make
  3. Install 
    sudo make install # Install rapi.so, rapid, rapictld into /usr/local/bin/
    make install-local # You can use local install (~/.local/bin/)

In the above procedure, installation is applied to only one node. You must do this on all nodes you use. Or use file sharing, such as NFS.

Usage

  1. Launch rapictld on the control node 
    # Interval between suspend and resume is 10ms
# Compute nodes that locate rapid are "compute_node1" and "compute_node2"
rapictld -t 10 -a computing_node1,cpmputing_node2
    # You can use debug message
rapictld -t 10 -a computing_node1,cpmputing_node2 -d Debug
  2. Launch rapid on all compute nodes 
    # Launch rapid on each node
rapid -a control_node
    # Launch with ssh
ssh compute_noding1 rapid -a control_node
# Or launch on background (But it is difficult to kill rapid)
ssh -f computing_node1 rapid -a control_node
    # You can use debug message
rapid -a control_node -d Debug
  3. Launch an MPI program with specifying "LD_PRELOAD" 
    # -x option is to set environment variable for all MPI processes
mpirun -x LD_PRELOAD=/usr/local/bin/rapi.so mpi_program

Script

You can use a script for launching rapid, rapictld and MPI program (with rapi).

Preparation

  1. Setup rapi
    • Install rapi.so and rapid to all computing-nodes, and add the location of them to PATH
    • Install rapictld to the control-node, and the location of it to PATH
  2. Setup MPI
    • Install mpirun to all computing-nodes
    • Install an MPI program you use to the same location
    • Install hostfile to the control-node
  3. Setup ssh
    • Control-node can ssh to all computing-nodes with
      • the hostname in hostfile
      • no password or passphrase

Launch

Run the script on control-node

script/run.sh -h hostfile -t 100 -p example_program -l log/$(date "+%Y%m%d%H%M%S").log