Open MPI logo

Open MPI User's Mailing List Archives

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

Subject: Re: [OMPI users] Decision map for MPI collective operations
From: Andy Georgi (Andy.Georgi_at_[hidden])
Date: 2008-04-20 04:23:19


Thanks a lot, i got it.

Andy

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.
>
> 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
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users

-- 
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