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["Alexander Eulitz \[Eugen\]" <question244277@xxxxxxxxxxxxxxxxxxxxx>]

Question #244277 on Yade changed:
https://answers.launchpad.net/yade/+question/244277

Alexander Eulitz [Eugen] proposed the following answer:
Interesting points that you mention matthias, thank you for that. This
should be added to the (multicore) performance pages on the wiki, I
think.

One thing that I'd like to add:
I observed strange fluctuations in performance on a 32-thread server.
If I start a yade-batch script twice which uses 16 cores in total and assigns 4 cores to each of the 12 jobs (via OMP_THREADS column in batch table) performance fluctuates between the two yade-batch "instances".
E.g. the first instance shows a performance in job#1 of 1,000 iterations/second and the second instance 100 iterations/seconds.
Meanwhile there was no other calculation on the server that would consum cpu power. Furthermore there is sufficient RAM (128 GB) for both instances.
I tried starting just one instance and this can result in either a fast or a slow one.

(i'm not sure if I already reported this thing before)

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