Hi,
I'm currently working on a project that aims to perform detailed measurements of internal MPI communication, particularly based on the PML layer. For example, I would like to measure internal point-to-point communication within collective operations. I’ve seen that using the monitoring module (enabled via --mca pml_monitoring_enable 2), Open MPI already provides summaries of the underlying point-to-point operations after program execution. This is very helpful. My goal is to access this information *dynamically* through the MPI_T interface and trace the data for different MPI functions at runtime. However, I’m running into a limitation: - The coll_monitoring_messages_count PVAR only shows counts for collective operations. - The pml_monitoring_messages_count PVAR only seems to capture activity from explicit point-to-point operations (like MPI_Send/MPI_Recv), but not from collectives such as MPI_Bcast. My question is: Is it currently possible to observe the internal point-to-point operations *triggered by collectives* (as visible in the monitoring summary) through MPI_T performance variables? I’d greatly appreciate any insights or recommendations. Best regards Anna To unsubscribe from this group and stop receiving emails from it, send an email to users+unsubscr...@lists.open-mpi.org.
