How do I sort out busy wait time from idle wait, user time from system time, and so on?
Don’t. MPI synchronization delays, which are key performance inhibitors you will probably want to study, can show up as user or system time, all depending on the MPI implementation, the type of wait, what run-time settings you have chosen, etc. In many cases, it makes most sense for you just to distinguish between time spent inside MPI from time spent outside MPI. Elapsed wallclock time will probably be your key metric. Exactly how the MPI implementation spends time waiting is less important. 4. What is PMPI? PMPI refers to the MPI standard profiling interface. Each standard MPI function can be called with an MPI_ or PMPI_ prefix. For example, you can call either MPI_Send() or PMPI_Send(). This feature of the MPI standard allows one to write functions with the MPI_ prefix that call the equivalent PMPI_ function. Specifically, a function so written has the behavior of the standard function plus any other behavior one would like to add. This is important for MPI performance analysis in a
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