[Users] How to generate a profiling file using mpiP

[Erik Schnetter]

On Apr 1, 2008, at 03:17:46, Thomas Radke wrote:
> 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.


There are some HPC Challenge Benchmarks at <http://icl.cs.utk.edu/hpcc/ 
 >.  This site stores also some results.  These benchmarks measure low- 
level system properties such as speed of memory access, communication  
bandwidth/latency etc.

-erik

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

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