[Users] cactus performance

[Ursula Gamma]

Dear Jose,

I think the best is you use a performance checking tool coming with your computer. For example  PAPI or 

CrayPat (on your lbl machine: http://www.nersc.gov/users/software/debugging-and-profiling/craypat/). You need to access hardware counters for getting the flops; this is not a software feature.Counting flops is so last century, though, and nobody talks about this these days. I am usually just interested in getting the shortest possible walltime for a given problem I want to solve with my Uschi evolution code in the Cactus framework.


Uschi

----------------
Uschi T. Gamma
Assistant to the SC, TAPIR, Caltech



________________________________
 From: Jose Fiestas Iquira <jafiestas at lbl.gov>
To: Ian Hinder <ian.hinder at aei.mpg.de>; users at einsteintoolkit.org 
Sent: Monday, March 26, 2012 8:58 PM
Subject: Re: [Users] cactus performance
 

Hello,


Thanks for the information. I had a look at the benchmarks and profiling links on the Cactus website, and would like to find out the way to calculate Flops performed by a Cactus application. Are they some numbers published? In one of the papers you sent to me I found timings of McLachlan (which is my application), but I could not find Flops per simulation.

It seems to me I could be able to run my application using .par-files prepared for benchmarking? Please correct me if I am wrong.

My goal is to have an idea of the Flops expected by McLachlan runs on larger machines (few thousands or cores).

Thanks,
Jose




2012/3/21 Frank Loeffler <knarf at cct.lsu.edu>

On Wed, Mar 21, 2012 at 01:15:05PM +0100, Ian Hinder wrote:
>> Frank, do you know what the following links have changed into?
>>
>> http://www.cct.lsu.edu/xirel/
>> http://www.cct.lsu.edu/CCT-TR/CCT-TR-2008-5
>
>Good question, I made an inquiry.
>
>Frank
>
>
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