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Subject: Re: [OMPI users] mpirun on 8-way node with rsh
From: Doug Reeder (dlr_at_[hidden])
Date: 2008-08-03 15:18:15


Pete,

I don't know why the behavior on an 8 processor machine differs with
the machine file format/syntax. You don't need to specify a machine
file on a single multiprocessor machine.

On you torque scheduled cluster you shouldn't need a machine file for
openmpi. Openmpi should just use the number of processors you
requested from torque. It will communicate with torque to find out
which ones to use.

Doug Reeder
On Aug 3, 2008, at 10:45 AM, Pete Schmitt wrote:

> I use the following: mpirun -machinefile machine.file -np 8 ./mpi-
> program
> and the machine file has the following:
>
> t01
> t01
> t01
> t01
> t01
> t01
> t01
> t01
>
> I get the following error:
>
> rm_12992: (0.632812) net_send: could not write to fd=4, errno = 32
> rm_13053: (0.421875) net_send: could not write to fd=4, errno = 32
> rm_l_3_13050: (0.636719) net_send: could not write to fd=5, errno = 32
> rm_13114: (0.210938) net_send: could not write to fd=4, errno = 32
> rm_12870: (1.066406) net_send: could not write to fd=4, errno = 32
> rm_12931: (0.855469) net_send: could not write to fd=4, errno = 32
> rm_l_4_13111: (0.425781) net_send: could not write to fd=5, errno = 32
> rm_l_1_12929: (1.070312) net_send: could not write to fd=5, errno = 32
> rm_l_2_12989: (0.859375) net_send: could not write to fd=5, errno = 32
> rm_l_5_13172: (0.214844) net_send: could not write to fd=5, errno = 32
> p0_12866: (5.285156) net_send: could not write to fd=4, errno = 32
>
> If I use np=6 or less, it works fine. It also works with 8 if the
> machine.file just contains t01:8
> Since we want to submit this to a torque/moab cluster, it's not
> possible
> to get the latter format.
>
> The OS is a 64b RH5.2
>
>
> --
> Pete Schmitt
> Technical Director:
> Discovery Cluster / Computational Genetics Lab
> URL: http://discovery.dartmouth.edu
> 179M Berry Baker Library, HB 6224
> Dartmouth College
> Hanover, NH 03755
>
> Dart: 603-646-8109
> DHMC: 603-653-3598
> Fax: 603-646-1042
> Cell: 603-252-2452
>
>
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