On , 2021Aug21, at 14:08, Victor Eijkhout <[email protected]<mailto:[email protected]>> wrote:
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. Partial rehabilitation for OpenMPI: Finished dup/free'ing 1000000 communicators real 0m9.301s user 0m9.120s sys 0m0.114s So that’s only 4 times slower than Mvapich, but the ludicrously slow performance is only for Spectrum MPI, not OpenMPI per se. Victor.
