[mpich-discuss] Running the processes just in the nodes

[Ariovaldo de Souza Junior]

thanks a lot you all, I'm working on that already : )

2008/9/22 Ralph Butler <rbutler at mtsu.edu>

> Below is a quick demo of how to do such things.
>
> First, show 3 machines in the mpd ring:
>
> (bp400:70)% mpdtrace
> bp400
> bp403
> bp401
>
>
> Now show that by default 3 processes will run on all the machines:
>
> (bp400:71)% mpiexec -l -n 3 hostname
> 0: bp400
> 1: bp403
> 2: bp401
>
>
> Now use the -1 (minus 1) arg to cause the first process to locate on the
> second host.  Of course
> the last one comes back to the first host, which may still be undesirable:
>
> (bp400:72)% mpiexec -l -1 -n 3 hostname
> 2: bp400
> 0: bp403
> 1: bp401
>
>
> Now, create a machine file (named mf) and prepare to use it.  It will map
> ranks to hosts.
> (bp400:74)% vi mf
> (bp400:75)% cat mf
> bp401
> bp403
> bp401
>
> Now use that machinefile to run the procs on hosts other than bp400.
> (bp400:76)% mpiexec -l -machinefile mf -n 3 hostname
> 0: bp401
> 1: bp403
> 2: bp401
>
>
> There are other ways to accomplish this as well using other options
> documented in the user guide.
>
> --ralph
>
>
>
> On MonSep 22, at Mon Sep 22 7:36AM, Ariovaldo de Souza Junior wrote:
>
>  I would like to know if is that possible to run the processes just in the
>> nodes, leting the master node free for other tasks. For example, I have a
>> small cluster with 9 core 2 quad, I would like to run the calculations just
>> in 8 computers. I have tried editing the mpd.hosts commenting the line that
>> points the name of the master node but it was useless, it started anyway.
>> Does anyone have a ligh to sheed over this issue?
>>
>> Thanks from now,
>>
>> Ariovaldo de Souza Junior
>> Federal University of Amazonas
>>
>>
>
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