[mpich-discuss] hydra_pmi_proxy using 100% CPU

[Colin Hercus]

On Sat, Jan 22, 2011 at 12:45 AM, Pavan Balaji <balaji at mcs.anl.gov> wrote:

>
> On 01/21/2011 09:17 AM, Colin Hercus wrote:
>
>> OK, I'm pretty much sorted, MPI job is running about 99% (times 4
>> servers) vs non MPI single server version even with IO to stdout. I
>>
>
> Great. Though, my recommendation to use MPI-IO still stands.

OK, but later :)

>
>
>  tried ch3:nem and it was 2% slower than sock.  I'm using multi-threaded
>> slaves with processor affinity, it's about 5% faster than single
>> threaded slaves.
>>
>
> That's surprising. ch3:nemesis should always be faster than ch3:sock as
> long as you don't have more threads/processes than the available number of
> cores.
>
> There was a slave thread for every core so I was a bit overcommitted and
master, mpiexec etc have to queue up. With nem master ran at around 30% CPU,
with sock around 1%.

Colin

>
>  -- Pavan
>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji <http://www.mcs.anl.gov/%7Ebalaji>
>
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