[gmx-users] mdrun load sharing between dual processor machine
David van der Spoel
spoel at xray.bmc.uu.se
Fri May 3 02:06:56 CEST 2002
On Thu, 2 May 2002, Oliver Beckstein wrote:
>On Thu, 2 May 2002, Lynne E. Bilston wrote:
>> Also, does ssh slows down the interconnect compared to rsh?
>According to the LAM documentation ssh/rsh is only used to start the
>processes on the other nodes; the actual communication is done through lam
>and is determined by the -c2c or -lamd options to mpirun (-c2c is supposed
>to be faster). The underlying transport mechanism that is determined at
>compile time (--with-rpi=tcp|sysv|usysv) might also influence your
>performance. usysv seems to be recommended if it works on your system but
>I haven't done any proper tests.
>[Has anyone looked at the influence of these variables on performance?
>Any recommendations--esp. for clusters of Athlon duals?]
that was with gromacs 2 before dual athlons were invented...
Dr. David van der Spoel, Biomedical center, Dept. of Biochemistry
Husargatan 3, Box 576, 75123 Uppsala, Sweden
phone: 46 18 471 4205 fax: 46 18 511 755
spoel at xray.bmc.uu.se spoel at gromacs.org http://zorn.bmc.uu.se/~spoel
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