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Subject: Re: [OMPI users] OpenMPI runtime-specific environment variable?
From: Adams, Brian M (briadam_at_[hidden])
Date: 2008-10-21 16:33:18

> -----Original Message-----
> From: users-bounces_at_[hidden]
> [mailto:users-bounces_at_[hidden]] On Behalf Of Ralph Castain
> Sent: Tuesday, October 21, 2008 10:53 AM
> To: Open MPI Users
> Subject: Re: [OMPI users] OpenMPI runtime-specific
> environment variable?
> On Oct 21, 2008, at 10:37 AM, Adams, Brian M wrote:
> > think it will help here. While MPICH implementations
> typically left
> > args like -p4pg -p4amslave on the command line, I don't see that
> > coming from OpenMPI-launched jobs.
> Really? That doesn't sound right - we don't touch the
> arguments to your application. We test that pretty regularly
> and I have always seen the args come through.
> Can you provide an example of where it isn't?

Sorry Ralph, I caused some confusion here. You are correct that OMPI does nothing to muck with any arguments passed to the user application -- they come through as expected.

I meant that when launching a binary with MPICH mpirun, it would _append_ to the command line arguments things including
-p4pg and -p4wd, possibly -p4amslave, which we could detect at run-time in the app context to determine that the app had indeed been launched with mpirun.