On Wed, Mar 2, 2011 at 4:25 PM, M. Scot Breitenfeld <span dir="ltr"><<a href="mailto:brtnfld@uiuc.edu">brtnfld@uiuc.edu</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<br>
First, thanks for the suggestion on using MPISBAIJ for my A matrix, it<br>
seems to have cut down on my memory and assembly time. For a 1.5 million<br>
dof problem:<br>
<br>
# procs: 2 4 8 16<br>
----------------------------------------------------------------<br>
Assembly (sec): 245 124 63 86<br>
Solver (sec): 924 578 326 680<br>
<br>
Memory (GB): 2.5 1.4 .877 .565<br>
<br>
The problem I have is the amount of time it's taking in AOCreateBasic,<br>
it takes longer then assembling,<br>
<br>
# procs: 2 4 8 16<br>
---------------------------------------------------------------------<br>
AOCreateBasic (sec): .6 347 170 197<br>
<br>
Is there something that I can change or something I can look for that<br>
might be causing this increase in time as I go from 2 to 4 processors<br>
(at least it scales from 4 to 8 processors). I read in the archive that<br>
AOCreateBasic is not meant to be scalable so maybe there is nothing I<br>
can do.<br></blockquote><div><br></div><div>Yes, this is non-scalable. What are you using it for?</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;">
Thanks,<br>
<font color="#888888">Scot<br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>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<br>