On Mon, Apr 19, 2010 at 12:28 PM, Li, Zhisong (lizs) <span dir="ltr"><<a href="mailto:lizs@mail.uc.edu">lizs@mail.uc.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;">
<div>
<div style="direction:ltr;font-family:Tahoma;color:rgb(0, 0, 0);font-size:13px">
<div> Hi,<br>
<br>
I think this is a beginner's question, but still hope someone can help me out. <br>
<br>
I've tried to run some PETSc examples and my own simple PETSc codes on my office's cluster as well as on Ohio Supercomputer Center's machine. At first I found no speedup for parallel processing and later I noticed by checking the rank that actually each node
is doing the same sequential processing. I'm sure the codes are parallel codes (such as ex19.c in SNES and ex7.c in TS tutorial codes). Is there anything I am missing in the installation or the run command such as"mpiexec -n 3 ex7"? How can I realize a parallel
running?<br></div></div></div></blockquote><div><br></div><div>The mpiexec in your path is not the one you configured with. What</div><div>MPI is begin used?</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;">
<div><div style="direction:ltr;font-family:Tahoma;color:rgb(0, 0, 0);font-size:13px"><div>
BTW, is it okay to ask questions here on a specific PETSc tutorial code?<br>
<br>
Thank you very much!<br>
<br>
Regards,<br>
<br>
<br>
Zhisong Li<br>
<br>
</div>
</div>
</div>
</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>