[mpich-discuss] hydra_pmi_proxy using 100% CPU

[Pavan Balaji]

On 01/20/2011 09:51 AM, Colin Hercus wrote:
> The 1Gb is MPI messages, about the same is written to stdout.

1GB of stdout might cause the proxy and mpiexec to be busy for a long 
time moving the data. Shouldn't you be considering MPI-I/O if you are 
writing such large amounts?

> My PC for compile and (static) link was at 1.2.1 and I was running on a
> server with 1.3.1 when I first noticed this. I then upgraded to 1.3.1
> but it made no difference.

Yes, mpiexec is backward compatible to any version of MPICH2 (or any 
other derivative of MPICH2). But it's best to always upgrade to the 
latest version.

> When would mpiexec and hydra_pmi_proxy use CPU? is it just related to
> stdout?

Mostly, only for stdout/stderr/stdin + when one MPI process needs to 
know the address of another remote MPI process (typically when you send 
the first message).

  -- Pavan

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji