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<div class="">On , 2021Aug21, at 14:08, Victor Eijkhout <<a href="mailto:eijkhout@tacc.utexas.edu" class="">eijkhout@tacc.utexas.edu</a>> wrote:</div>
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<div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">3b.
Dup and free million times takes more time than writing this email. Why do I keep hearing that OpenMPI is so great? Everything slightly non-standard I try is hopelessly slow and broken.</span></div>
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<div class="">Partial rehabilitation for OpenMPI: </div>
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<div class="">Finished dup/free'ing 1000000 communicators</div>
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<div class="">real 0m9.301s</div>
<div class="">user 0m9.120s</div>
<div class="">sys 0m0.114s</div>
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<div class="">So that’s only 4 times slower than Mvapich, but the ludicrously slow performance is only for Spectrum MPI, not OpenMPI per se.</div>
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<div class="">Victor.</div>
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