[gmx-users] scaling on xeons
David van der Spoel
spoel at xray.bmc.uu.se
Fri Mar 12 10:31:01 CET 2004
On Thu, 11 Mar 2004, Anton Feenstra wrote:
>Y U Sasidhar wrote:
>> I have run dppc bench mark on our dual xeon(1.8 GHz/1.4Ghz):
>> on 1.8 GHz Machine
>> 1 node = 129 ps/day
>> 2 nodes on same machine = 198 ps/day
>> scaling = 76%
>> 2 nodes: 1.8 GHz + 1.4 GHz = 167 ps/day
>> scaling = 64%
there's an option to grompp -load
that allows you to sepcify the relative speed of the machines. In your
gromp -load "1.8 1.4"
should do the trick.
>> will I benefit if I use Gigabit switch and ethernet card ?
>> right now we use 10/100 fast ethernet switch and intel ether express pro
>> 100B network card
>Your main problem will be load imablance between the 1.4G and 1.8G machines,
>so that both can never be faster than twice the speed of the slowest. There
>doesn't seem much to gain by Gb ethernet.
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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