Questions and Answers :
Macintosh :
Benchmark Results show too many CPUs
Message board moderation
Author | Message |
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Charles Michael Fulton Send message Joined: 13 Nov 09 Posts: 8 Credit: 968,855 RAC: 0 |
I have a 2009 Mac Pro Quad Core 2.66 ghz, which I recently purchased. When running the CPU benchmarks, BOINC identifies "8" as the number of CPUs. Not a huge deal, but I think that BOINC downloads 8 tasks and attempts to do them all at once. This results, I think, in a less-than-optimum workload for my Quad Core Mac. If it would just download 4 at a time, I think it would finish the tasks much quicker. Has anyone else experienced this problem? Is there anyway to adjust BOINC so that it sees 4 cores instead of 8? |
Bob Merrill Send message Joined: 7 Jun 99 Posts: 120 Credit: 8,531,677 RAC: 19 |
There is a place in preferences where you can set how many cores Boinc should use. |
Gundolf Jahn Send message Joined: 19 Sep 00 Posts: 3184 Credit: 446,358 RAC: 0 |
You probably have turned on hyperthreading. So, BOINC correctly sees eight CPUs (four real and four virtual ones). You can either turn hyperthreading off or, as pixzy suggested, go to your Computing preferences and set "On multiprocessors, use at most 50% of the processors". Gruß, Gundolf |
OzzFan Send message Joined: 9 Apr 02 Posts: 15691 Credit: 84,761,841 RAC: 28 |
According to Intel, your Xeon W3520 is a quad core CPU with Intel HyperThreading Technology. HyperThreading takes each physical core and makes it appear as two logical cores to get more efficient use out of the processor registers. So in fact your 4 physical core has 8 logical cores thanks to HTT and BOINC is reading your CPU correctly. |
Todd Madson Send message Joined: 4 Aug 99 Posts: 71 Credit: 30,888,293 RAC: 15 |
You will actually get better results if you let it crunch eight. |
Charles Michael Fulton Send message Joined: 13 Nov 09 Posts: 8 Credit: 968,855 RAC: 0 |
Good to know! Hyperthreading tech, eh? Neat! |
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