[Pw_forum] A Question About Time

[mohsen modaresi]

Dear Paolo
tahnks for your Ref.
But i think there is bug in Q.E., When i run pw.x, CPUs work for 29 sec but
time given in output file is 6 sec.
Thanks again for your answer
Mohsen Modaresi


On Thu, Apr 29, 2010 at 2:21 PM, Paolo Giannozzi <giannozz at democritos.it>wrote:

> mohsen modaresi wrote:
>
> > When i run parallel (With MPICH) version with 4 core,
> > in output file i see this "total time until now 6.06 sec."  it take
> > but if i use my watch29 sec to run. What is the problem?
> > another problem:
> > If i use MPICH with 1 core it takes only 17 sec (on my watch) which is
> > smaller than 29, Why?
>
> See Sec.3, "Understanding parallelization", and sec.6.4,
> "Parallelization issues", of the user guide.
>
> P.
> --
> Paolo Giannozzi, Democritos and University of Udine, Italy
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