[MITgcm-support] Poor cpu usage percentage

[Rogan, Nicholas]

I don't seem to have any STDOUT files anywhere on my computer . . . . only STDERR. I'm comparing the two Makefiles now, so far only different Netcdf/compiler locations.

On 20/07/15 02:01 PM, Dimitris Menemenlis  <dmenemenlis at gmail.com> wrote:
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> Wild guesses again:
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> (1) If your macbook has solid state disk vs hard disk on your iMac, it could still be an IO problem.
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> Look at tail end of STDOUT.0000 to see the timings and find out which component of MITgcm
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> are slower on iMac vs macbook.
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> (2) Your compilation options or compilers differ. Look at your Makefile in build directory to see
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> whether you are using same compiler and optimization options.
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> > On Jul 20, 2015, at 8:12 AM, Rogan, Nicholas <nrogan at geomar.de> wrote:
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> > Hi Dimitris,
> > Thanks for getting back to me. Thanks for correcting me, I was under the impression that make -j 2 was to do with the runtime use of multiple cores. 
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> > So, I have been running my MITgcm setup on my macbook pro for the last fw months. I had problems with my iMac and I could not ssh in to carry out the runs on there (It is currently sitting in a country other than the one I'm working). I was back visiting last week and got it up and running again. I am purely using it for running my model. 
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> > For comparison:
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> > My iMac is 2.66 GHz Intel core 2 duo with 8Gb RAM.
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> > My macbook is 2.4 Ghz Intel core 2 duo with 4Gb RAM.
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> > I compiled the MITgcm identically on both machines, but currently my Macbook is running about twice as fast as my iMac. The macbook usually has 5-10% IDLE CPU usage whereas the iMac is running with 65-90% IDLE CPU usage.They are both run with identical data files and the only program running on both (other than hidden processes) is Terminal. 
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> > So I'm pretty sure the issue is not the I/O as I'm comparing relative to my macbook and I have no other programs running. I've attached screenshot of the top details. It's very strange, I've never had this problem before.
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> > Nick
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-- 
Kind regards,

Nick

------------------------------------------------------
Dr Nicholas Rogan
Postdoctoral Researcher
http://www.geomar.de/en/mitarbeiter/fb2/ch/nrogan/

GEOMAR Helmholtz Centre for Ocean Research, Kiel
Wischhofstraße 1-3, Build. 12
D-24148 Kiel
Germany
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