Hi,<br><br>mpi_pong test reuslts show that out gigabit network has <br><br>Max rate = 115.335908 MB/sec Min latency = 49.948692 usec<br><br>I ran it several times and got almost the same results. Unfortunately I could not analyse more and the reuslt was attached to this mail.<br>
<br>Hee Il<br><br><div><span class="gmail_quote">2008/3/29, Elvedin Trnjanin <<a href="mailto:trnja001@umn.edu">trnja001@umn.edu</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
You would do that within the code. If you're trying to pass every<br> element of an int array one at a time (message size is sizeof(int)), it<br> will have much worse performance than sending the entire array (message<br>
size is sizeof(int)*arraydimensions.<br> <br> Example -<br> <a href="http://www.scl.ameslab.gov/Projects/mpi_introduction/figs/mpi_pong.c">http://www.scl.ameslab.gov/Projects/mpi_introduction/figs/mpi_pong.c</a><br> This is a start for a decent approximation of network bandwidth and<br>
latency for a certain message size. Although not accurate, it'll<br> certainly give you an idea of your network's performance with various<br> message sizes and transfer types. It only works on two nodes at a time<br>
however so other types of communication like AlltoAll are not tested.<br> <br><br> Hee Il Kim wrote:<br> ><br> > I checked the bandwidth behavior mentioned by Elvedin. Could I change<br> > or setup the message size and frequency in a runtime level or any<br>
> other steps?<br> ><br> <br></blockquote></div>