Parallel Programming Guide for HP-UX Systems

MPI
Profiling
Chapter 2 73
• Communication hot spots—The processes in your application between which the largest
amount of time is spent in communication.
• Message bin—The range of message sizes in bytes. The instrumentation profile reports
the number of messages according to message length.
NOTE You do not get message size information for MPI_Alltoallv instrumentation.
Figure 2-3 displays the contents of the example report compute_pi.instr.
Figure 2-3 ASCII instrumentation profile
Version: HP MPI 01.08.00.00 B6060BA - HP-UX 11.0
Date: Mon Apr 01 15:59:10 2002
Processes: 2
User time: 6.57%
MPI time : 93.43% [Overhead:93.43% Blocking:0.00%]
-----------------------------------------------------------------
-------------------- Instrumentation Data --------------------
-----------------------------------------------------------------
Application Summary by Rank (second):
Rank Proc CPU Time User Portion Sytem Portion
-----------------------------------------------------------------
0 0.040000 0.010000( 25.00%) 0.030000( 75.00%)
1 0.030000 0.010000( 33.33%) 0.020000( 66.67%)
-----------------------------------------------------------------
Rank Proc Wall Time User MPI
-----------------------------------------------------------------
0 0.126335 0.008332( 6.60%) 0.118003( 93.40%)