[mpich-discuss] Hydra: Sorting node list by number of CPUs

[Yauheni Zelenko]

Hi, Reuti!

I need to reorder the list of granted slots in the cluster you got from resource manager.

It's not only related to LSF, but to Load Leveler, Sun Grid Engine, etc.

In case of LSF it's possible to rearrange environment variable. But it may be harder in case of Load Leveler and Sun Grid Engine, where slots are written in file, which may be not accessable for write.

Eugene.
________________________________________
From: mpich-discuss-bounces at mcs.anl.gov [mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Reuti [reuti at staff.uni-marburg.de]
Sent: Thursday, October 21, 2010 2:22 AM
To: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] Hydra: Sorting node list by number of CPUs

Hi,

Am 21.10.2010 um 01:32 schrieb Yauheni Zelenko:

> I think will be good idea to have command line option which will force Hydra to sort node list by number of CPUs before proxies creation.
>
> Our application is working in master-slaves mode and master is always have rank 0. From performance point of view it's good idea to put as much slaves as possible to same host to use shared memory.
>
> However managed environment like LSF could distribute CPUs across hosts randomly. For example we had 1 CPU in host1 and seven on host2.
>
> So sorting node list should help. I think it may be implemented with qsort().

do you want a similar feature of LSF outside of LSF, or do you want to reorder the list of granted slots in the cluster you got from LSF?

-- Reuti


>
> Eugene.
>
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