[Users] cactus performance
Jose Fiestas Iquira
jafiestas at lbl.gov
Wed Mar 28 22:31:47 CDT 2012
Regarding performance. I am willing to run McLachlan shortly using CrayPat
and I am setting the simulation time here in par/qc0-mclachlan.par, like
Cactus::terminate = "time"
Cactus::cctk_final_time = .1
usually this time was 100.
Am I missing something else in setting the time for a short simulation? I
could not find it in the documentation.
On Mon, Mar 26, 2012 at 10:44 PM, Jose Fiestas Iquira <jafiestas at lbl.gov>wrote:
> Dear Uschi,
> Thanks. I am right now trying CrayPat. I learned about it some days ago
> and tried my own N-cody code with CrayPat. I am using now the McLachlan
> Cactus thorn for my applications.
> I am just not sure about the way to compile the code before running
> CrayPat. I was using simfactory for compilation and now I am using gmake
> directly. Since compilation takes some time, I am waiting for it to finish.
> Let see if it works.
> The reason I am interested in Flops is because I want to know if my Cactus
> application will scale together with my own N-body runs in large machines
> and reach Petascale.
> Btw, did you try CrayPat with Cactus? You use gmake for compiling?
> On Mon, Mar 26, 2012 at 10:20 PM, Ursula Gamma <uschigamma at yahoo.com>wrote:
>> 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:
>> 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 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
>> 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).
>> 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.
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