[OMPI users] Decision map for MPI collective operations

2008-04-19 Thread Andy Georgi

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.geo...@zih.tu-dresden.de
WWW:http://www.tu-dresden.de/zih


Re: [OMPI users] Decision map for MPI collective operations

2008-04-19 Thread George Bosilca
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.geo...@zih.tu-dresden.de
WWW:http://www.tu-dresden.de/zih
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