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<div class="">On , 2021Aug20, at 00:33, Barry Smith <<a href="mailto:bsmith@petsc.dev" class="">bsmith@petsc.dev</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=""><span class="Apple-converted-space"> </span>It
sounds like maybe the Spectrum MPI_Comm_free() is not returning the comm to the "pool" as available for future use;</span></div>
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<div class="">1. I can not find in the standard what the proper response is to running out of communicators.</div>
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<div class="">2. Mpich on my laptop returns MPI_COMM_NULL after 2044 dups without free.</div>
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<div class="">3. A million dups with free run in a second.</div>
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<div class="">2b. Spectrum MPI on my P9 runs out after 4096 dups</div>
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<div 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.</div>
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<div class="">Victor.</div>
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