<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Oct 20, 2023, at 7:12 AM, Matthew Knepley <knepley@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><div dir="ltr"><div dir="ltr">On Thu, Oct 19, 2023 at 8:35 PM Jorge Nin <<a href="mailto:jorgenin@mit.edu">jorgenin@mit.edu</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hi Mathew,<div><br></div><div><div>Thanks for the response. It actually seems like the matrix is very sparse (<font color="#363636"><span style="white-space:pre-wrap">0.99% sparsity from what I’m measuring). It’s an FEA solver so it would make sense.</span></font></div><div><font color="#363636"><span style="white-space:pre-wrap">My current guess is the optimization flags are making a large difference for the M1 Mac, but I am also surprised it makes such a huge difference.</span></font></div><div><font color="#363636"><span style="white-space:pre-wrap"><br></span></font></div><div><font color="#363636"><span style="white-space:pre-wrap">It’s why I was asking if there was a resource or another to use my own version of PETSc with Conda.</span></font></div></div></div></blockquote></div></div></div></blockquote><div><br></div> What do you mean by "with Conda"? You can entire the Conda environment, configure and compile PETSc, and then link your code against this PETSc library (instead of the one provided by Conda). By being in the Conda environment it means it is using the Conda Python, the Conda compilers etc. </div><div><br></div><div> Barry</div><div><br></div><div>Some users have difficulty configuring PETSc inside the Conda environment; if your ./configure or make of PETSc fails just send configure.log (and make.log) to petsc-maint@mcs.anl.gov and we'll figure out how to get it compiled.</div><div><br></div><div><br><blockquote type="cite"><div><div dir="ltr"><div class="gmail_quote"><div><br></div><div>We do not know how Conda works unfortunately.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div><font color="#363636"><span style="white-space:pre-wrap">I believe a 2-3 x speed up is worth the hassle. </span></font></div><div><font color="#363636"><span style="white-space:pre-wrap"><br></span></font></div><div><font color="#363636"><span style="white-space:pre-wrap"><br></span></font></div><div><font color="#363636"><span style="white-space:pre-wrap">Best,</span></font></div><div><font color="#363636"><span style="white-space:pre-wrap">Jorge</span></font></div><div><font color="#363636" face="Menlo, Monaco, Courier New, monospace"><span style="white-space:pre-wrap"><br></span></font></div><div><font color="#363636" face="Menlo, Monaco, Courier New, monospace"><span style="white-space:pre-wrap"><br></span></font></div><div><font color="#363636" face="Menlo, Monaco, Courier New, monospace"><span style="white-space:pre-wrap"><br></span></font></div><div><blockquote type="cite"><div>On Oct 19, 2023, at 4:00 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> wrote:</div><br><div><div dir="ltr"><div dir="ltr">On Thu, Oct 19, 2023 at 3:54 PM Jorge Nin <<a href="mailto:jorgenin@mit.edu" target="_blank">jorgenin@mit.edu</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
I was playing around with a self compiled version and, and a the Conda binary of Petsc on the same problem, on my M1 Mac.<br>
Interestingly I found that the Conda binary solves the problem 2-3 times slower vs the self compiled version. (For context I’m using the petsc4py python interface) <br>
<br>
I’ve attached two log views to show the comparison.<br>
<br>
I was mostly curious about the possible cause for this.<br></blockquote><div><br></div><div>All the time is in the LU numeric factorization. I don't know if your matrix is sparse or dense. I am guessing it is dense and different LAPACK implementations are linked. If it is sparse, then the compiler options are different between builds, but I would be surprised if it made this much difference.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I was also curious how I could use my own compiled version of PETSc in my Conda install? <br>
<br>
<br>
Best,<br>
Jorge<br>
<br>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>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><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
</div></blockquote></div><br></div></div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>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><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
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