mario ciappy wrote:
Dear All,
I configured gromacs 3.3.3 for parallel runs, using the precompiled
packeges on ubuntu server 8.04, with LAM program 7.1.2 ( alreay present
in server verison). I tried with d.villin benchmark but I detected an
decrease of performance increasing the node's number.
The obtained results for 1 node are:
(Mnbf/s) (GFlops) (ns/day) (hour/ns)
Performance: 6.686 1.437 8.471 2.833
The obtained results for 7 nodes are:
(Mnbf/s) (GFlops) (ns/day) (hour/ns)
Performance: 5.169 1.112 6.545 3.667
I have a cluster of 7 nodes (pentium 4 3.2 Ghz with RAM 2Gb) connected
on 10/100 Mbps dual speed up hub.
I don't know if it is a configuration problem (because with precompiled
packages I couldn't use the configuration parameters described on web)
or an hardware problem due to hub.
One can get what one pays for with network hardware. Search in the
archives for posts by Carsten Kutzner with lots of comments here.
Mark
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