Date: Thu, 15 Apr 2010 08:49:38 +0300 From: Andriy Gapon <avg@freebsd.org> To: Maho NAKATA <chat95@mac.com> Cc: alc@freebsd.org, amvandemore@gmail.com, alan.l.cox@gmail.com, freebsd-stable@freebsd.org, als@modulus.org Subject: Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920 Message-ID: <4BC6A8F2.4010501@freebsd.org> In-Reply-To: <20100415.102000.645538350615365151.chat95@mac.com> References: <m2y6201873e1004140945n855c8800we9baced2e293f270@mail.gmail.com> <4BC5F289.7020408@freebsd.org> <n2o6201873e1004141047t97d89cb0o2688fae1875eae08@mail.gmail.com> <20100415.102000.645538350615365151.chat95@mac.com>
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on 15/04/2010 04:20 Maho NAKATA said the following: > Hi Andriy and Adam, > > I did also the same thing as suggested. > > my conclusion: on Core i7 920, 2.66GHz, TurboBoost on, HyperThreading off, So HyperThreading is off. > then, pinned to each core like following > > % procstat -t 1408 > PID TID COMM TDNAME CPU PRI STATE WCHAN > 1408 100160 dgemm - 3 190 run - > 1408 100161 dgemm - 2 190 run - > 1408 100162 dgemm - 2 190 run - > 1408 100163 dgemm - 1 189 run - > 1408 100164 dgemm - 0 190 run - > 1408 100165 dgemm - 3 189 run - > 1408 100166 dgemm - 1 190 run - > 1408 100167 dgemm initial thread 0 190 run - But there are still 8 threads. Can you check how many threads you have on Linux with the same configuration? Is it possible to tell GotoBLAS to use 4 threads? If yes, can you also test that scenario? Also, would it be possible for you to test recent 8-STABLE? Just for the sake of experiment. -- Andriy Gapon
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