[Users] ET_2013_11 run performance

[Roland Haas]

Hello Jim,

> So, I tried using the previous stampede.cfg included in the ET_2013_05 
> branch of simfactory, the same one I used to compile my ET_2013_05 
> build.  This cfgfile uses the same version of IMPI but different Intel 
> compilers (version 13.0.2.146). The run speed shows the same trends as 
> when using the newer config file.
Have you tried on a different machine as well?

> The parameter file I am using is EXACTLY the same, not a single change.  
> The run is fairly lightweight, not requiring many nodes to run (I used 
> 2).  It is purely vacuum GR, an R1 configuration (equal-mass, 
> non-spinning BBH system with a small initial separation).  Memory usage 
> in all three cases is the same, and is stable throughout the run.
> 
> Are there new parameters that I should be setting to get similar 
> performance as before?  New thorns that I should have active?  If not, 
> has anyone else used stampede recently and experienced similar problems?
In particular, please have a look at ticket #1512
https://trac.einsteintoolkit.org/ticket/1512 which contains a small
parfile which you can use to test for particular issue in loopcontrol.
The test runs in ~2 minutes or so and you should be able to verify if
you see the slowdown you experienced. A workaround is to set
LoopControl::settle_after_iteration = 0 . The slowdown after recovery
however does not fit this picture.

Yours,
Roland

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