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Subject: [OMPI users] any way to get serial time on head node?
From: Ross Boylan (ross_at_[hidden])
Date: 2009-07-06 12:48:46


Let total time on my slot 0 process be S+C+B+I
= serial computations + communication + busy wait + idle
Is there a way to find out S?
S+C would probably also be useful, since I assume C is low.

The problem is that I = 0, roughly, and B is big. Since B is big, the
usual process timing methods don't work.

If B all went to "system" as opposed to "user" time I could use the
latter, but I don't think that's the case. Can anyone confirm that?

If S is big, I might be able to gain by parallelizing in a different
way. By S I mean to refer to serial computation that is part of my
algorithm, rather than the technical fact that all the computation is
serial on a given slot.

I'm running R/RMPI.

Thanks.
Ross