openmpi

• openmpi allows programs to be run cooperatively with other users and share resources. It can trivially be extended across several machines.

Documentation

• man OpenMPI for local Linux man page
• Web site: http://open-mpi.org

Installation

• aptitude install libopenmpi-dev libopenmpi1.3 openmpi-bin openmpi-common openmp-doc

Example Code

• Or asimov:/coregroup1/images/ubuntu-scripts/cluster/mpi-code

Example Files

• We assume the files live in /opt/mpi-code
  • CHange mpi-test to modify this assumption
• mpi-test - Script to compile an mpi-hello.c
  • references /opt/mpi-code
• mpi-hello - mpi-hello binary
• mpi-hello.c - source file for our test
• mpi-nodes.conf - mpi node configuration file to use

Notes

• There is a C program called mpi-hello.c and a script called mpi-test that runs the program on the computers and cores defined in mpi-nodes.conf
• mpi-test test script options: * -loadbalance which means spreadevenly across all cpu/nodes * -np 4 which is the number of processes in total to run.

Example Run Results

• I ran the test on swag.cs - a machine has 8 cores.

cat mpi-nodes.conf
swag.cs slots=8

cd /opt/mpi-code 
./mpi-test
Process 0 on swag.cs out of 4
Process 1 on swag.cs out of 4
Process 2 on swag.cs out of 4
Process 3 on swag.cs out of 4