Hi Albert,
The GTX590s are pretty terrible cards - at least for running jobs in
parallel so I really wouldn't bother. Only run serial jobs on them, two
total, one on each of the GPUs reported by devicequery.
If you are seeing variation in performance for serial GPU runs then it is
likely that other stuff is running on your machine that is interfering. Are
other users on the machine? Do you have other jobs running? Does the machine
run X windows? - If you are running multiple jobs on the same physical GPU
(not card but GPU - a GTX590 card has 2 GPUs) then you will likely see
massive performance degredation.
You might also have issues if you are writing to a remote file system (over
NFS for example) but this is normally not so large a variation. The factors
of '2' in the numbers you quote (27 ca= 28, 14, 7) suggests to me that you
are running more than one process on a single GPU.
Unfortunately without more specific details of how your machine is setup,
what is running, some output from top etc it is difficult to offer more
suggestions.
All the best
Ross
> -----Original Message-----
> From: Albert [mailto:mailmd2011.gmail.com]
> Sent: Tuesday, May 08, 2012 1:36 AM
> To: AMBER Mailing List
> Subject: [AMBER] strange CUDA benchmark
>
> Dear:
>
> I am testing a CUDA benchemark based on Amber 12+GNU, I use the same
> system under GTX590 for testing. Some times I can get as high as 27
> ns/day, sometimes it 14 ns/day, sometimes it is even only 7 ns/day.....
>
> I do the test in the same directory and don't modify any parameters. I
> am just wondering what happen?
>
> thank you very much
> Albert
>
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Received on Tue May 08 2012 - 10:00:04 PDT
