Developer Guide

Job Schedulers Support

The Intel® MPI Library supports the majority of commonly used job schedulers in the HPC field.
The following job schedulers are supported on Windows* OS:
  • Microsoft HPC Pack*
  • Altair PBS Pro*

Microsoft HPC Pack*

The Intel MPI Library job startup command
mpiexec
can be called out of Microsoft HPC Job Scheduler to execute an MPI application. In this case, the
mpiexec
command automatically inherits the host list, process count, and the working directory allocated to the job.
Use the following command to submit an MPI job:
> job submit /numprocessors:4 /stdout:test.out mpiexec -delegate test.exe
Make sure the
mpiexec
and dynamic libraries are available in
PATH
.

Altair* PBS Pro*

The Intel MPI Library job startup command
mpiexec
can be called out of PBS Pro job scheduler to execute an MPI application. In this case, the
mpiexec
command automatically inherits the host list, process count allocated to the job if they were not specified manually by the user.
mpiexec
reads
%PBS_NODEFILE%
environment variable to count a number of processes and uses it as a machine file.
Example of a job script contents:
REM PBS -l nodes=4:ppn=2 REM PBS -l walltime=1:00:00 cd %PBS_O_WORKDIR% mpiexec test.exe
Use the following command to submit the job:
> qsub -C "REM PBS" job
mpiexec
will run two processes on each of four nodes for this job.

Controlling Per-Host Process Placement

When using a job scheduler, by default the Intel MPI Library uses per-host process placement provided by the scheduler. This means that the
-ppn
option has no effect. To change this behavior and control process placement through
-ppn
(and related options and variables), use the
I_MPI_JOB_RESPECT_PROCESS_PLACEMENT
environment variable:
> set I_MPI_JOB_RESPECT_PROCESS_PLACEMENT=off

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.