Hi Douglas, hi Spencer,

I run the test case with the feature/Euler1D branch
with SumFac :
Time-integration : 18.7779s
Total Computation Time = 21s
This make a difference!

no tuning:
Time-integration : 32.797s
Total Computation Time = 35s
Also no too bad!

I already notice the orphaned code that you removed. Was this the solution of my speed issue, or was it because I used the release version 4.3.1.?

Cheers,
Helmut

Von: Douglas Serson [d.serson@gmail.com]
Gesendet: Donnerstag, 19. Mai 2016 15:40
An: Kühnelt Helmut
Cc: Sherwin, Spencer J; nektar-users
Betreff: Re: [Nektar-users] EulerCFE - performance issue & MPI problem

Hi Helmut,

I pushed some changes to the feature/Euler1D branch which should make this simulation somewhat faster.

It would be great if you could test that to see if it helps with your problem.

Cheers,

Douglas

2016-05-18 13:29 GMT+01:00 Kühnelt Helmut <Helmut.Kuehnelt@ait.ac.at>:

Hi Spencer, hi Douglas,

Indeed, using Collections (auto => SumFac) definitively helps: Total Computation Time = 95s (180s before)

I noticed that the code runs single threaded, even though Boost_USE_MULTITHREADED is ON and OpenBlas is compiled as multi threaded. Any hints on that?

Cheers,
Helmut

Von: Sherwin, Spencer J [s.sherwin@imperial.ac.uk]
Gesendet: Mittwoch, 18. Mai 2016 10:25
An: Kühnelt Helmut
Cc: nektar-users
Betreff: Re: [Nektar-users] EulerCFE - performance issue & MPI problem

HI Helmut,

I am building with Release mode and nothing else in particular. I happen to have MPI turned on but I do not think that will make a difference.

One thing that might be worth checking is the use of openblas. I have had trouble with openblas in the past for small matrix sizes. The compilation I used will have been using the default installation in /usr/lib/libblas.a. I guess Douglas’ test will have used the Framework of Mac OS X. However looking at the set up on the compute module I do seem to have openblas loaded

(@Chris: Could you confirm what version of openblas is running on Victoria

Other configurations are:

library

gcc 4.9.2

boost 1.58 - installed from a module

Do you have another machine/laptop we could turn this test on?

Cheers,

Spencer.

PS I had a time step of 1e-6 and attach my .xml file below