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Message boards : Number crunching : MilkyWay N-Body Sim., 1.62(mt) vs. 1.62(st) app - speed difference?
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ProfileSutaru Tsureku

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Message 65133 - Posted: 11 Sep 2016, 22:02:52 UTC
Last modified: 11 Sep 2016, 22:05:15 UTC

For MilkyWay N-Body Sim. we could choose 2 apps and different settings...

Currently, the...

1.62 (multi thread) app - all available CPU-Threads allowed
1.62 (multi thread) app - limit to 'all -1' CPU-Threads (e.g. Quad-Core CPU, 4 CPU-Threads -1 = use 3 CPU-Threads)
1.62 (multi thread) app - limit to 1 CPU-Thread
1.62 (single thread) app - use just 1 CPU-Thread


I tested the
1.62 (mt) app (limited to 1 CPU-Thread)
and the
1.62 (st) app
...on my Celeron J1900 Quad-Core CPU, and it looks like the 1.62 (mt) app is much slower with this config.


If you have VGA cards installed, or you use the iGPU, you shouldn't run the (mt) app on all available CPU-Threads, if yes the GPU WUs stop (from my experiences).
This is still like this?


E.g. on a Quad-Core CPU, the (mt) app allowed to use 3 CPU-Threads is faster/slower than the (st) app?
...at the end of the day, which app crunch more WUs?

E.g. on 12 CPU-Threads CPUs (2 * 6 = 12 real CPU-Cores (my dual Xeon PC, HT off ;-) )...
the (mt) app allowed to use 11 CPU-Threads
vs.
(st) app?
...at the end of the day, which app crunch more WUs?


Speed differences: (mt) app all CPU-Threads allowed vs. (mt) app 'all -1' CPU-Threads allowed?


Or with the (mt) app it must be always straight numbers, like 2, 4, 6, 8 CPU-Threads for max. speed?


Maybe someone made already all this tests?


Thanks.
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Message boards : Number crunching : MilkyWay N-Body Sim., 1.62(mt) vs. 1.62(st) app - speed difference?

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