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Subject: Re: [OMPI users] Mimicking timeout for MPI_Wait
From: Katz, Jacob (jacob.katz_at_[hidden])
Date: 2009-12-06 11:15:25


By the way, there is no way to time-out a call to MPI_Init(), or is there?

--------------------------------
Jacob M. Katz | jacob.katz_at_[hidden] | Work: +972-4-865-5726 | iNet: (8)-465-5726

-----Original Message-----
From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On Behalf Of Katz, Jacob
Sent: Sunday, December 06, 2009 17:42
To: Open MPI Users
Subject: Re: [OMPI users] Mimicking timeout for MPI_Wait

Thanks, Douglas.
I found your code in the archive.
--------------------------------
Jacob M. Katz | jacob.katz_at_[hidden] | Work: +972-4-865-5726 | iNet: (8)-465-5726

-----Original Message-----
From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On Behalf Of Douglas Guptill
Sent: Sunday, December 06, 2009 15:53
To: users_at_[hidden]
Subject: Re: [OMPI users] Mimicking timeout for MPI_Wait

On Sun, Dec 06, 2009 at 02:29:01PM +0200, Katz, Jacob wrote:

> Thanks.
> Yes, I meant in the question that I was looking for something creative, both fast responding and not using 100% CPU all the time.
> I guess I’m not the first one to face this question. Have anyone done anything “better” than the simple solution?

My MPI application is a two-process thing, in which data is thrown
back and forth. For the most part, one process is calculating, and
the other is waiting.

I got tired of seeing both cpus at 100% load, and based on suggestions
from Jeff Squyres and Eugene Loh, wrote MPI_Recv.c and MPI_Send.c. I
load these with my application, and bingo! Only one cpu busy at any
given time.

They use a graduated sleep; the first sleep is short, the second is
twice as long, and so on, up to a maximum sleep time.

I sent the code along with my last message on the subject (December
2008, or later) so it should be in the archives. Failing that, I
could post it again, if anyone wants it.

Douglas.
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