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Subject: Re: [OMPI users] Decision map for MPI collective operations
From: George Bosilca (bosilca_at_[hidden])
Date: 2008-04-19 17:02:38


You need access to the source in order to look at the decision maps.
They are in ompi/mca/coll/tuned/coll_tuned_decision_fixed.c file.

   george.

On Apr 19, 2008, at 3:41 AM, Andy Georgi wrote:

> hello all,
>
> i want to measure the time needed for collective operations on a
> cluster
> by using ompi 1.2.5. i read that the algorithm which is used depends
> on
> msgsize and/or commsize and ompi constructs a decision map for the
> collective on the system. now my question:
>
> where can i find these decision map for my system?
>
> i'm no sysadmin, but i hope there is a way to get this information
> anyway ;-).
>
> regards,
>
> andy
> --
>
> Dresden University of Technology
> Center for Information Services
> and High Performance Computing (ZIH)
> D-01062 Dresden
> Germany
>
> Phone: (+49) 351/463-38783
> Fax: (+49) 351/463-38245
>
> e-mail: Andy.Georgi_at_[hidden]
> WWW: http://www.tu-dresden.de/zih
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