I have parallel program written on mpi. I am able to run on openmpi environment in our Linux cluster.
I found out that it is rather slow. I have heard that it could be faster if it is run on infinipath environment where
it has lower latency.
I run my program which runs perfectly on openmpi environment first by changing the environment to
After submitting my jobs with a given number of "Nslots", I got the error message
Any comments are welcome, thankx ? Do I need to change inside my mpi parallel code to run on infinipath environment ?
----- Original Message ----
From: Andy Georgi <Andy.Georgi@zih.tu-dresden.de>
To: Open MPI Users <email@example.com>
Sent: Sunday, April 20, 2008 9:23:19 AM
Subject: Re: [OMPI users] Deci
sion map for MPI collective operations
Thanks a lot, i got it.
George Bosilca schrieb:
> 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.
> 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 ;-).
University of Technology
>> Center for Information Services
>> and High Performance Computing (ZIH)
>> D-01062 Dresden
>> Phone: (+49) 351/463-38783
>> Fax: (+49) 351/463-38245
>> e-mail: Andy.Georgi@zih.tu-dresden.de
>> WWW: http://www.tu-dresden.de/zih
>> users mailing list
> users mailing list
Dresden University of Technology
Center for Information Services
and High Performance Computing (ZIH)
Phone: (+49) 351/463-38783
Fax: (+49) 351/463-38245
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