Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] top question
From: Scott Atchley (atchley_at_[hidden])
Date: 2009-06-03 08:37:45


On Jun 3, 2009, at 6:05 AM, tsilva_at_[hidden] wrote:

> Top always shows all the paralell processes at 100% in the %CPU
> field, although some of the time these must be waiting for a
> communication to complete. How can I see actual processing as
> opposed to waiting at a barrier?
>
> Thanks,
> Tiago

Using what interconnect?

For performance reasons (lower latency), the app and/or OMPI may be
polling on the completion. Are you using blocking or non-blocking
communication?

Scott