[Pw_forum] Parallel efficiency problem
Paolo Giannozzi
giannozz at democritos.it
Tue Jul 29 15:52:51 CEST 2008
lihm wrote:
> However, I found that the walltime is too long for parallel calculations:
>
> PWSCF : 1m 4.86s CPU time, 32m53.67s wall time
unless you have really slow communications between CPUs,
the only reason that can lead to such a "speedown" is heavy
I/O via the network (e.g. NFS-mounted disks)
Paolo
--
Paolo Giannozzi, Democritos and University of Udine, Italy
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