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Date: Wed, 5 Dec 2007 22:02:22 +0100 From: Ingo Molnar <mingo@...e.hu> To: Jie Chen <chen@...b.org> Cc: Simon Holm Th??gersen <odie@...aau.dk>, Eric Dumazet <dada1@...mosbay.com>, linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4 * Jie Chen <chen@...b.org> wrote: >> sorry to be dense, but could you give me instructions how i could >> remove the affinity mask and test the "barrier overhead" myself? I >> have built "pthread_sync" and it outputs numbers for me - which one >> would be the barrier overhead: Reference_time_1 ? > > To disable affinity, do configure --enable-public-release > --disable-thread_affinity. You should see barrier overhead like the > following: Computing BARRIER time > > Sample_size Average Min Max S.D. Outliers > 20 19.486162 19.482250 19.491400 0.002740 0 > > BARRIER time = 19.486162 microseconds +/- 0.005371 > BARRIER overhead = 8.996257 microseconds +/- 0.006575 ok, i did that and rebuilt. I also did "make check" and got src/pthread_sync which i can run. The only thing i'm missing, if i run src/pthread_sync, it outputs "PARALLEL time": PARALLEL time = 22.486103 microseconds +/- 3.944821 PARALLEL overhead = 10.638658 microseconds +/- 10.854154 not "BARRIER time". I've re-read the discussion and found no hint about how to build and run a barrier test. Either i missed it or it's so obvious to you that you didnt mention it :-) Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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