[mvapich-discuss] mpirun_rsh is not launching large jobs in version 1.4

[Dhabaleswar Panda]

Yutaka - Thanks for your suggestion.

Craig - Let us know if this helps. In MVAPICH2 1.4, a new enhancement has
been added to speedup job launch time for large number of processes.  The
parameter MV2_FASTSSH_THRESHOLD controls this. You can get more details on
this parameter from the following URL:

http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.4.html#x1-10800011.21

Currently, the default value for this parameter is 256. This is in terms
of nodes (not cores).  If you have 8 cores/node on your system, the new
scheme will be triggered for >=2,048 cores. I believe this is what you are
facing. If Yutaka's suggestion does not work, please feel free to push the
value of this parameter to a higher number (based on your system size)
when you launch your job. This will allow the normal scheme (not the
enhanced scheme) to be used for launching larger number of processes.

Let us know if these suggestions help.

DK


On Fri, 27 Nov 2009, Yutaka Kubota wrote:

> Dear Craig
>
> Please swap "-np" and "-hostfile" options. I think that you should write like follow command line.
>
> # $MPICH/bin/mpirun_rsh -np 2048 -hostfile $MACHINE_FILE ./wrf.exe
>
> Best regards
>
> Yutaka Kubota
>
> -----Original Message-----
> From: mvapich-discuss-bounces at cse.ohio-state.edu [mailto:mvapich-discuss-bounces at cse.ohio-state.edu] On Behalf Of Craig Tierney
> Sent: Saturday, November 28, 2009 1:37 AM
> To: mvapich-discuss at cse.ohio-state.edu
> Subject: [mvapich-discuss] mpirun_rsh is not launching large jobs in version 1.4
>
> When I try and launch a large application using mpirun_rsh
> under mvapich2-1.4, I get the following error:
>
> # $MPICH/bin/mpirun_rsh -hostfile $MACHINE_FILE -np 2048 ./wrf.exe
> Word too long.
> #
>
> If I reduce the cores to use slightly, I can get the application to launch.
>
> Craig
>
> --
> Craig Tierney (craig.tierney at noaa.gov)
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