[mpich-discuss] mpich runs

[Luis Del Castillo]

Everytime I run mpirun -np 5 or -np 8 the results for PI are the same but the wall clock time is different. 

-----Original Message-----
From: Reuti [mailto:reuti at staff.uni-marburg.de] 
Sent: miércoles, 20 de octubre de 2010 08:31 a.m.
To: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] mpich runs

Am 20.10.2010 um 00:30 schrieb Luis Del Castillo:

> Hi fellows my name is Luis Alejandro Del Castillo and am  having issues to figure it out why if run  mpirun twice with the same configuration give me 2 different answers.
>  
> wrf at cl2master-> ./mpirun -np 5 ../examples/cpi
> Process 0 on cl2master
> Process 1 on node1
> Process 3 on node3
> Process 4 on node4
> Process 2 on node2
> pi is approximately 3.1416009869231245, Error is 0.0000083333333314
> wall clock time = 0.007812
> wrf at cl2master-> ./mpirun -np 5 ../examples/cpi
> Process 0 on cl2master
> Process 3 on node3
> Process 1 on node1
> Process 2 on node2
> Process 4 on node4

Do you mean the different order in stdout? AFAIK this cannot be predicted.

-- Reuti


> pi is approximately 3.1416009869231245, Error is 0.0000083333333314
> wall clock time = 0.000000
> wrf at cl2master->
>  
> I have a Quad Core Beowulf cluster with 11 nodes (1 master , 10 slaves) all the same configuration.
> I want to do this because I am trying to explain the performance doing some graph.
>  
> Thanks
>  
>  
> Luis Alejandro Del Castillo Riley
> luis.delcastillo at cathalac.org
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