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Old 2011-07-25, 04:45   #1
Dubslow
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Jun 2011
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Default CPU Assignments aren't working

Hey guys,
This is Linux M/Prime/95 dual booting from the same folder as Windows, hence the program name given. I don't know about Windows, but in Linux, when I choose menu option 2, Test/Worker threads, and set the workers to use a specific cpu, whenever I close the menu and come back, it always has reset to smart cpu assignment. I think this makes a difference, because when I run Worker 1 LL and the rest factoring, I get .060-.065 seconds per iteration. When I have 1 and 2 do LL and the rest factoring, 1 jumps to .070-.075 seconds per iteration, while 2 is the same .060-.065 as before. I can only think of this being a result of the cpu assignments, but like I said, they won't stick. Is there some way to manually edit local.txt or prime.txt to assign workers to cpu's? That would have the added benefit of also maintaining the same assignments in Windows.

AMD Phenom II X6 1055 Thuban 2.8 GHz Six core Processor
8 GB RAM
Ubuntu 11.04
Windows 7 (Professional?)

And see here on the differences between OS's:
http://mersenneforum.org/showthread.php?t=15771

Last fiddled with by Dubslow on 2011-07-25 at 04:51 Reason: adding link
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Old 2011-07-25, 05:00   #2
Dubslow
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Got it, nvm. Turns out stopping the worker threads while changing the preferences helps. Also found the relevant place in the local.txt file. The one thing to note is that in the file the cpu's are numbered from 0, not 1, even though in the output they are numbered from 1. Someone please delete this thread.
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