Hi,
I can confirm I have done what Kevin says in this email. At least it
was enough for me to write a shell script that would do
#!/bin/bash
export FOO=bar
mpirun ... my_parallel_app $@
Hope it helps,
-- Diego.
Kevin Ball wrote:
Mathieu,
On Fri, 2006-06-23 at 04:38, mg wrote:
Hello,
Traditionally, a parallel application is run like following
export FOO=foo
mpirun -np 2 -machinefile mymachinefile my_parallel_app [app options]
(To be known by all the nodes of my cluster, the environment variable
FOO has to be set on all the nodes or exported on the nodes by
mpirun.)
Few months ago, I used MVAPICH on a cluster of Opteron: this MPI
distribution allows me to launch shell scripts with the mpirun script
like following :
myscript.sh|| #!/bin/bash
| export FOO=foo
| my_parallel_app [app options]
|
end
mpirun -np 2 myscript.sh
(In that case, the environment variable FOO is exported on all the
nodes)
I heard all the distributions do not support this feature. Indeed, I
use currently MPICH-1.2.5.2 which does not permit me to do it.
I think that you can probably make MPICH do this. However, you will
need to add to your script slightly and change it to something like
#!/bin/bash
MPICH_OPTS=$*
export FOO=foo
my_parallel_app $MPICH_OPTS
and invoke it like
mpirun -np 2 myscript.sh [app options]
This (I believe) will work in MPICH, and probably most or all other MPI
implementations. The reason for doing it like this is that some
implementations of MPI pass information to the MPI library through
commandline options added to the program. They then use the call to
MPI_Init to pull these options off and fix pointers so that the
application code doesn't see these special added options.
Nevertheless, it should be standardized in the distributions based on
the MPI-2 standard. So, can someone confirm it and/or send me a link
to the page of the standard which says it?
I don't know anything about this, sorry, but I would expect it to work
similarly to how I described above.
-Kevin
Thanks a lot,
Mathieu.
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