[Wrf-users] mpiexec: failed to obtain sock from manager

[Andrew Peace]

Hi

I only run MM5 with MPICH, but the same principles hold for running other 
programs with MPICH.  You need to use a 'machine file' to tell MPICH how many 
processes to run on each computer.  In your case it would be a two line file, 
something like this:

cs-room443-d01:4
cs-room443-d02:4

If you called the machine file 'mf', then to run 'hostname', you would call 
mpiexec like this:
  $ mpiexec -l -machinefile mf -n 8 /bin/hostname

See the section "Running programs" in user.pdf in the MPICH doc directory for 
more info on machine files.

I hope this helps.

Andrew Peace
Department of Physics
The Univessity of Auckland
New Zealand

On Tuesday 25 September 2007 05:30, Gerardo De Jesus Montoya Gaviria wrote:
> We are trying to run the WRF model in a cluster of two intel machines (each
> one with two dual core procesors x86_64) under linux fedora 6. We can run
> succesfully the model in one machine with 4 nodes (two dual core 2x
> processor), Using MPICH2 2-1.0.5p4 with PGI version 7.0.7.  However, when
> we run the same model in the cluster, Mpich 2 only recognizes two
> processors (one per machine) as it is shown by the comands: mpdtrace,
> mpdringtest and mpiexec.
>
>
> [administrador at cs-room443-d01 Paquetes]$ mpdtrace
> cs-room443-d01
> cs-room443-d02
>
> [administrador at cs-room443-d01 Paquetes]$ mpdringtest
> time for 1 loops = 0.000850915908813 seconds
>
> [administrador at cs-room443-d01 Paquetes]$ mpiexec -l -n 1 /bin/hostname
> 0: cs-room443-d01
>
> [administrador at cs-room443-d01 Paquetes]$ mpiexec -l -n 2 /bin/hostname
> 0: cs-room443-d01
> 1: cs-room443-d02
>
> [administrador at cs-room443-d01 Paquetes]$ mpiexec -l -n 3 /bin/hostname
> mpiexec_cs-room443-d01 (mpiexec 425): mpiexec: failed to obtain sock from
> manager
>
>
> is there any way to configure mpich for our cluster with 8 nodes?. Any
> suggestion will be helpful.
>
> Thanks.
>
> Gerardo Montoya
> Full professor
> National Unversity of Colombia.
>
>
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