[Users] How to generate a profiling file using mpiP

[Erik Schnetter]

On Mar 31, 2008, at 14:20:19, Hee Il Kim wrote:
> Thanks Thomas,
>
> I referred the site you introduced, http://numrel.aei.mpg.de/Research/Peyote/Docs/mpiP.html 
> . I didn't try IPM yet.
>
> I recently made a cluster of 10 computing nodes with dual quad core  
> Xeon (Harpertown E5420). The nodes are connected with a usual  
> giagabit switch. Unfortunately, when I tested the system performance  
> using Cactus benchmarks, BSSN_PUGH and BSSN_Carpet_Whisky, I got a  
> bad scalability (~700sec for 1CPU, 1500sec for 64CPU).

Hee Il,

how large is the cluster?  A factor of 2 is not really bad, since you  
still get a factor of 32 speedup compared to running on a single CPU.   
What is the slowdown when you go from using 1 to using 2 full nodes?

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/

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