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Subject: Re: [OMPI users] a question about [MPI]IO on systems without network filesystem
From: jody (jody.xha_at_[hidden])
Date: 2010-09-29 14:29:34


Hi Paul

> Is it possible to configure/run OpenMPI in a such way, that only _one_
> process (e.g. master) performs real disk I/O, and other processes sends the
> data to the master which works as an agent?

It is possible to run OpenMPI this way, but it is not a matter of configuration,
but of implementation alone.

> Of course this would impacts the performance, because all data must be send
> over network, and the master may became a bottleneck. But is such scenario -
> IO of all processes bundled to one  process - practicable at all?

I think this question can only be answered by trying, because it
depends strongly
on the volume of your messages and the quality of your hardware
(network and disk speed)

Jody