How CPU perf is computed ?

Message boards : Number crunching : How CPU perf is computed ?

Author	Message
mickael_83 Send message Joined: 25 Oct 09 Posts: 10 Credit: 12,911,036 RAC: 0 Level Scientific publications	Message 22881 - Posted: 3 Jan 2012 \| 15:53:55 UTC
	Hello Everybody ! Happy new year ! There is something that annoys me a little: if you take a look @ my computers, id 54975 & ID 114761, you can see they use the same CPU, Q6600 @ 2.4G. Matador is overclocked @ 3.2. If you look at the details, there is a huge difference in MIPS & Gflops. Matador is @ 4Gflops and 16000 Mips, while the other is only @ 2.3Gflops and only at 4000 Mips. even if matador is 25% faster on clock, I don't think it can make a so huge difference. Do you think the OS can explain this ?
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skgiven Volunteer moderator Volunteer tester Send message Joined: 23 Apr 09 Posts: 3968 Credit: 1,995,359,260 RAC: 0 Level Scientific publications	Message 22918 - Posted: 8 Jan 2012 \| 15:19:29 UTC - in response to Message 22881. Last modified: 8 Jan 2012 \| 15:26:50 UTC
	The benchmark system is a Boinc feature, rather than a project issue. Linux and Windows tend to be somewhat unequal. IIRC Linux under-reports but generally does more work (on the CPU). GPUGrid is a GPU project so reported performance of the CPU is largely irrelevant to actual GPU task performance and credit. As some CPU is needed, the faster the CPU the better, but a generic benchmark does not accurately measure real performance on a real project. ____________ FAQ's HOW TO: - Opt out of Beta Tests - Ask for Help
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Retvari Zoltan Send message Joined: 20 Jan 09 Posts: 2343 Credit: 16,206,655,749 RAC: 261,147 Level Scientific publications	Message 22974 - Posted: 14 Jan 2012 \| 10:40:10 UTC - in response to Message 22881.
	The benchmark of the 32 bit and the 64 bit BOINC manager are different. I have changed my WinXP from 32 bit to 64 bit recently, and the benchmark results of the 32 bit and the 64 bit BOINC manager are different even on the same hardware. I don't exactly remember the numbers, but on the 64 bit client the floating point ops are lower by ~10%, and the integer MIPS are higher by ~40% on the same hardware. I still have a 32 bit client, almost the same hardware as one of my 64 bit clients: (Core i7-870) on the 64 bit client: 3623.97 MFLOPS 12621.2 MIPS On the 32 bit client: 4200.95 MFLOPS 9044.98 MIPS
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mickael_83 Send message Joined: 25 Oct 09 Posts: 10 Credit: 12,911,036 RAC: 0 Level Scientific publications	Message 22976 - Posted: 14 Jan 2012 \| 13:05:58 UTC
	Hello. Yes i know it is a boinc feature, and GPUgrid does not really mind about cpu power, but i found this surprising. The windows machine is 32 bits, while the gentoo machine is 64bits. Having so much difference between two same processors caught my attention.... Thank you for your answers...
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Message boards : Number crunching : How CPU perf is computed ?

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