Re: HyperThreading makes worse to me (was Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920)

2010-04-15 Thread Adrian Chadd
May I make a suggestion? Would you mind creating a shared google spreadsheet with your testing results and a shared google document with the test setup? I think having the data in an easily represented, easily shared medium would be beneficial to everyone. Adrian On 15 April 2010 08:46, Maho N

Re: HyperThreading makes worse to me (was Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920)

2010-04-15 Thread Garrett Cooper
On Wed, Apr 14, 2010 at 9:21 PM, Ian Smith wrote: > On Wed, 14 Apr 2010, Garrett Cooper wrote: >  > On Wed, Apr 14, 2010 at 7:49 PM, Garrett Cooper wrote: >  > > On Wed, Apr 14, 2010 at 5:46 PM, Maho NAKATA wrote: >  > >> Hi Andry and Adam >  > >> >  > >> My test again. No desktop, etc. I just r

Re: HyperThreading makes worse to me (was Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920)

2010-04-14 Thread Ian Smith
On Wed, 14 Apr 2010, Garrett Cooper wrote: > On Wed, Apr 14, 2010 at 7:49 PM, Garrett Cooper wrote: > > On Wed, Apr 14, 2010 at 5:46 PM, Maho NAKATA wrote: > >> Hi Andry and Adam > >> > >> My test again. No desktop, etc. I just run dgemm. > >> Contrary to Adam's result, Hyper Threading make

Re: HyperThreading makes worse to me (was Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920)

2010-04-14 Thread Garrett Cooper
On Wed, Apr 14, 2010 at 7:49 PM, Garrett Cooper wrote: > On Wed, Apr 14, 2010 at 5:46 PM, Maho NAKATA wrote: >> Hi Andry and Adam >> >> My test again. No desktop, etc. I just run dgemm. >> Contrary to Adam's result, Hyper Threading makes the performance worse. >> all tests are done on Core i7 920

Re: HyperThreading makes worse to me (was Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920)

2010-04-14 Thread Garrett Cooper
On Wed, Apr 14, 2010 at 5:46 PM, Maho NAKATA wrote: > Hi Andry and Adam > > My test again. No desktop, etc. I just run dgemm. > Contrary to Adam's result, Hyper Threading makes the performance worse. > all tests are done on Core i7 920 @ 2.67GHz. (TurboBoost @2.8GHz) > > Turbo Boost off, Hyper thr

HyperThreading makes worse to me (was Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920)

2010-04-14 Thread Maho NAKATA
Hi Andry and Adam My test again. No desktop, etc. I just run dgemm. Contrary to Adam's result, Hyper Threading makes the performance worse. all tests are done on Core i7 920 @ 2.67GHz. (TurboBoost @2.8GHz) Turbo Boost off, Hyper threading off: 82% (35GFlops)[1] Turbo Boost off, Hyper threadin