David van der Spoel
spoel at xray.bmc.uu.se
Fri Dec 12 14:38:01 CET 2003
On Thu, 11 Dec 2003, Erik Lindahl wrote:
>I haven' compared the Xeons recently, but we did similar tests when the
>Athlons were upgraded to more cache a couple of years ago.
>In general, more cache helps 10-15% extra at the same frequency for
>large systems (100,000 atoms), but the difference is almost negligible
>(couple of %) e.g. for a protein in water.
I recently posted my Opteron benchamrks, where the opterons at 2 GHz w 1
Mb cachce were significantly faster than the 2.2 GHz xeons with 512 kb.
Part of it must be due to cache. Check the archives
>On Dec 11, 2003, at 9:45 AM, Justin MacCallum wrote:
>> has any done a comparison of 3GHz Xeons with 512KB and 1MB cache? Is
>> there any indication that the extra cache helps for GROMACS runs? Is
>> there any advantage to the 3.2GHz Xeons other than the obvious slight
>> improvement due to clock speed?
>> Justin MacCallum
>> jlmaccal at ucalgary.ca
>> PhD Student
>> Department of Biological Sciences
>> University of Calgary
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David van der Spoel, PhD, Assist. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596, 75124 Uppsala, Sweden
phone: 46 18 471 4205 fax: 46 18 511 755
spoel at xray.bmc.uu.se spoel at gromacs.org http://xray.bmc.uu.se/~spoel
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