<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Thu, Mar 5, 2015 at 6:12 PM, Justin Chang <span dir="ltr"><<a href="mailto:jchang27@uh.edu" target="_blank">jchang27@uh.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Hi all,<br><br></div>I apologize if these may be simple questions that could be found somewhere. In the log_summary profiling, I have a few questions about the MPI messages/MPI message lengths metrics:<br><br></div>1) For MPI messages, does the value under Max correspond to the maximum number of messages a single processor passes?<br></div></div></div></blockquote><div><br></div><div>Yes.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><div></div><div>2) What are the units of MPI message lengths? Is it in bytes?</div></div></div></blockquote><div><br></div><div>Yes, returned by PetscMPITypeSize().</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>3) What does MPI message lengths refer to exactly? Like, does it refer to the max/min/average size per sent/received message or does it refer to the cumulative size that a single processor sends/receives?<br></div></div></blockquote><div><br></div><div>Cumulative, see</div><div><br></div><div> <a href="https://bitbucket.org/petsc/petsc/src/d8151eeaff97562eb317e17b7b0cecab16831f69/include/petsclog.h?at=master#cl-343">https://bitbucket.org/petsc/petsc/src/d8151eeaff97562eb317e17b7b0cecab16831f69/include/petsclog.h?at=master#cl-343</a></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-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div></div>Thanks<span class=""><font color="#888888"><br clear="all"><div><div><div><div><div><br>-- <br><div><div dir="ltr"><div><div><div>Justin Chang<br></div>PhD Candidate, Civil Engineering - Computational Sciences<br></div>University of Houston, Department of Civil and Environmental Engineering<br></div>Houston, TX 77004<br><a href="tel:%28512%29%20963-3262" value="+15129633262" target="_blank">(512) 963-3262</a><br></div></div></div></div></div></div></div></font></span></div>
</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>
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