On , 2021Aug20, at 00:33, Barry Smith <[email protected]<mailto:[email protected]>> wrote:
It sounds like maybe the Spectrum MPI_Comm_free() is not returning the comm to the "pool" as available for future use; 1. I can not find in the standard what the proper response is to running out of communicators. 2. Mpich on my laptop returns MPI_COMM_NULL after 2044 dups without free. 3. A million dups with free run in a second. 2b. Spectrum MPI on my P9 runs out after 4096 dups 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. Victor.
