[Dune-devel] dune-istl umfpack support

[Benedikt Oswald]

Hello Dominic, thanks for these numbers!
In fact, I am using SuperLU Dist (MPI, parallel, complex distributed matrix).

When you say SuperLU, do you mean SuperLU Dist or the serial version ?

Greetings, Benedikt



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Dr. sc. techn. Benedikt Oswald - first engineer - LSPR AG - phone - +41 43 366 90 74
Technoparkstrasse 1, CH-8005 Zürich, benedikt.oswald at lspr.ch
"Passion is required for any great work, and for the Revolution passion and audacity are required in big doses." 
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On Oct 31, 2013, at 1:45 PM, Dominic Kempf <dominic.r.kempf at gmail.com> wrote:

> Hey Christoph,
> Hey devel-list,
> 
> while doing a writeup of my work for Markus, I reran some of the
> performance tests and realized that infact SuperLU and UMFPack
> performance results are NOT within the same order of magnitude.
> UMFPack shows significantly better performance, see this table (I hope
> its somehwat readable)
> 
> dofs                   1e4           4e4         1.6e5          6.4e5
> T_{superlu}         0.076        0.395       2.707         19.839
> T_{umfpack}       0.064        0.245       1.367         9.176
> time savings      15.79%      37.98%    49.51%      53.75%
> $M_{superlu}      30.78 MB  123.23 MB 493.2 MB
> $M_{umfpack}    25.72 MB  88.66 MB  418.9 MB
> mem savings     16.44%     28.06%     15.07%
> $P_{superlu}      13.4 MB    55.64 MB  253.18 MB  1.16 GB
> $P_{umfpack}    11.8 MB    41.33 MB  177.14 MB  771.16 MB
> peakmem sav.   11.95%     25.72%     30.04%       33.53%
> 
> T is the wallclock time here, M the total allocation size as given by
> valgrind and P the peak memory usage as given by /usr/bin/time -v.
> As you can see, there is something to be gained here!
> 
> Best,
> Dominic
> 
> On Thu, Oct 17, 2013 at 10:33 AM, Dominic Kempf
> <dominic.r.kempf at gmail.com> wrote:
>> Hey Christoph,
>> thanks for testing the branch. My system gave me memory with zeroes,
>> yours didnt... thats exactly where I need you.
>> 
>> I did a bit of measurements to compare superlu and umfpack, though not
>> on hard problems. In those tests umfpack was a bit faster and needed
>> less memory, within the same order of magnitude though. The original
>> reasons to implement umfpack support were conceptional difficulties
>> with superlu in multithreaded environment. Markus can elaborate more
>> on that (and whether umfpack actually solved the issue).
>> 
>> 
>> Best,
>> Dominic
>> 
>> 2013/10/17 Christoph Grüninger <christoph.grueninger at iws.uni-stuttgart.de>:
>>> Hi Dominic,
>>> thanks for the quick patch. Using commit ...da3510863 it does no longer
>>> segfault.
>>> 
>>> Bye
>>> Christoph
>>> 
>>> --
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>>> pouvait utiliser les mathématiques.    (Paul Lafargue)
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>>>         Please visit www.cmwr14.de
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