according to my reserches, it all depends on your network and processor type. If u got a fast network, really fast not 1GB ethernet... you can "sacrifice" the transfer time. If you got a processor with hyperthreading its possible that ur threads run faster<br>
<br><div class="gmail_quote">On Mon, Jul 9, 2012 at 6:37 PM, Pavan Balaji <span dir="ltr"><<a href="mailto:balaji@mcs.anl.gov" target="_blank">balaji@mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
On 05/26/2012 06:43 PM, angelo pascualetti wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
How many processes (-np) should tell mpich to be faster than openmp?<br>
</blockquote>
<br>
There's no way we can answer this question. Depending on the application, either MPI-only or MPI+OpenMP can be faster. MPICH supports both models, so you can experiment with them.<span class="HOEnZb"><font color="#888888"><br>
<br>
-- Pavan<br>
<br>
-- <br>
Pavan Balaji<br>
<a href="http://www.mcs.anl.gov/~balaji" target="_blank">http://www.mcs.anl.gov/~balaji</a><br>
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