Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Status: Answered => Solved
yang yi confirmed that the question is solved:
Bruno Chareyre (bruno-chareyre)
Thank you very much. It is not a good news for me. OK. I will try.
Thank youo
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Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre proposed the following answer:
> the parallel programming, means there are 98 programming copies, and
each copy for a cores. If my understanding right or not?
More or less.[1]
> If I increase
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
yang yi posted a new comment:
To Bruno Chareyre (bruno-chareyre):
Thank you very much. I test -j1 and -j8 on my PC, yes. the speed is
the same. And I test the command ~$ export OMP_NUM_THREADS=1 and the
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre proposed the following answer:
> I understand you suggestion to get the optimal price of cores. But now
for me, to get the fastest speed of the simulation is the aim.
Yes. That's exactly my
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
yang yi posted a new comment:
To Jan Stránský (honzik) and Bruno Chareyre (bruno-chareyre) :
Thank you very much for you professional response.
My the simulation process likes this:
The two kinds of
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre proposed the following answer:
> Start the script by the 'start' button on the Controller(), without
"3D" show [...] did 10 iteration test [...] Because I get the time by
hand, so there is errors
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Jan Stránský proposed the following answer:
> -j32 26.1s
> -j48 24.51s
> -j90 23.27s \ 23.72s
> -j92 23.05s \ 23.76s \ 24.24s \ 24.09s
> the -j92 or -j90 maybe the optimal jobs
pretty much depending on the
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
yang yi posted a new comment:
Janek Kozicki (cosurgi) , Jan Stránský (honzik) , Bruno Chareyre
(bruno-chareyre)
Thank you very much for answer my question. According to your
suggestion, I checked the
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre posted a new comment:
> If the performance is just depend on a core, that is a very terrible
message to me
Not really. The message was: 1/ of course you don't automatically gain speedup
by using
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre proposed the following answer:
Ah: and it is absolutely critical that you keep GUI turned *off*.
Else the comparisons are meaningless, you could be testing the GPU. You don't
use GUI for long
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre proposed the following answer:
> So I use 96 core.
Maybe it is a bad idea. Or maybe it is ok but it doesn't give much more
compared to, say, 48.
OpenMP may have an optimum somewhere and maybe it
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Janek Kozicki posted a new comment:
Sorry, that was written in a hurry. I mean that you can use these two
commands to measure the computer performance using a standardized test.
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Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Jan Stránský posted a new comment:
> But I need a faster speed for the simulation by parallel computation.
So I use 96 core.
Would another usage of the power be meaningful, e.g. running in parallel
12
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Janek Kozicki posted a new comment:
run this command:
yade --stdperformance -j8
or this command:
yade --quickperformance -j8
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Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
yang yi posted a new comment:
1. Jan Stránský (honzik)
Than you very much for you quickly response. I explain as the follows
(1) The script
The script must import torch. The code is use to simulated
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Janek Kozicki posted a new comment:
If you have a recent yade version you can do yade --stdperformance -jN
benchmark, with same N on both systems. If the speed is not stable,
because some different programs are
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Bruno Chareyre proposed the following answer:
Hi,
What you observe is actually expected:
XEON 4, 3.2GH
I7 3.6GH
The I7 is faster. HPC rarely outperform personal computers in per-core
performance.
Arguably,
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Son Pham Thai proposed the following answer:
Hi,
i have also used remote desktop PC to run yade. You should be very
clear on which one you think that it is slow: (1). YADE simulation
(running in the command
Question #690973 on Yade changed:
https://answers.launchpad.net/yade/+question/690973
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
TLTR: do not compare -j8 and -j96, compare -j8 for both systems.
Difference of -j8 and -j96 is another problem not much related
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