With your references to shared memory, you imply that you're only running
on one node. Do you actually have two processors on your machine?
If you only have one processor, then your 2 processes are likely to be
thrashing while trying to run on your one processor. If this is so, then
the 167 seconds is likely to be mostly thrashing time, not communication
time.
On Wed, 9 Apr 2003, choy hau yan wrote:
> I use 2 processor for parallel in shared memory.
>
> When I run in one processor (no parallel) the time of
> calculation is 5157 seconds.
>
> when run in 2 processor,(one master, one slave) the
> time is 5324 seconds.
> So, the time communications is 167 seconds. As I know
> there is nearly no communication in shared memory. So
> what is the reason that contribute the time (167
> seconds.) Thanks.
--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
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