<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Feb 26, 2016 at 10:27 AM, TAY wee-beng <span dir="ltr"><<a href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
On 26/2/2016 11:32 PM, Barry Smith wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Feb 26, 2016, at 9:28 AM, TAY wee-beng <<a href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>> wrote:<br>
<br>
Hi,<br>
<br>
I have got a 3D code. When I ran with 48 procs and 11 million cells, it runs for 83 min. When I ran with 96 procs and 22 million cells, it ran for 99 min.<br>
</blockquote>
This is actually pretty good!<br>
</blockquote>
But if I'm not wrong, if I increase the no. of cells, the parallelism will keep on decreasing. I hope it scales up to maybe 300 - 400 procs.<br></blockquote><div><br></div><div>100% efficiency does not happen, and here you get 83%. You could probably get that into the 90s depending on your algorithm, but this</div><div>is pretty good.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
So it's not that parallel. I want to find out which part of the code I need to improve. Also if PETsc and hypre is working well in parallel. What's the best way to do it?<br>
</blockquote>
Run both with -log_summary and send the output for each case. This will show where the time is being spent and which parts are scaling less well.<br>
<br>
Barry<br>
</blockquote>
That's only for the PETSc part, right? So for other parts of the code, including hypre part, I will not be able to find out. If so, what can I use to check these parts?<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I thought of doing profiling but if the code is optimized, I wonder if it still works well.<span class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
Thank you.<br>
<br>
Yours sincerely,<br>
<br>
TAY wee-beng<br>
<br>
</font></span></blockquote></blockquote>
<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div>
</div></div>