• 9.1
  • 07/08/2015
  • Public Content

Ungroup MPI Functions

 Analyze MPI process activity in your application.
To see the particular MPI functions called in the application, right-click on MPI in the Event Timeline and choose
Ungroup Group MPI
. This operation exposes the individual MPI calls.
MPI Ungrouped
After ungrouping the MPI functions, you see that the processes communicate with their direct neighbors using
at the start of the iteration.
This data exchange has a disadvantage: process
does not exchange data with its neighbor
until the exchange between
is complete. This delay appears as a staircase resulting with the processes waiting for each other.
at the end of the iteration resynchronizes all processes; that is why this block has the reverse staircase appearance.

Product and Performance Information


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Notice revision #20110804