This timer is provided by the MPI implementation. In general this is simply a wrapper around
and then using it instead of
only has disadvantages: with
Intel® Trace Collector knows that processes running on the same node share the same clock and thus does not synchronize between them. The same information cannot be obtained through the MPI API and thus Intel® Trace Collector is conservative and assumes that clock synchronization is needed. This can be overridden with the
configuration option. Another disadvantage is increased overhead and potentially implementation errors in MPI.