[Users] How to generate a profiling file using mpiP

[Thomas Radke]

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). It's not a code problem. I got similar reports from my
> colleague that it required unexpectedly large communication time for his
> GADGET-2 test. I did ping-pong test for the network and heard that it is
> relatively good as a gigabit system.
> 
> So, I'm trying to get profiling information. Actually, I don't know what I
> can do next with it and whether it could be improved by a user-level
> prescription. Anyway I think the problem looks serious. I don't think it's
> soley a problem of the large latency network because the benchmarks will not
> require large communications. Now I'm going to apply Open-MX to reduce
> latency time. I haven't heard any benchmarks for this Harpertown cluster
> with gigabit network. I appreciate any comments and suggestions.

You could try some of the standard SPEC benchmarks 
(http://www.spec.org/benchmarks.html) and compare them for varying 
numbers of nodes.

-- 
Cheers, Thomas.