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While the --inst-functions instrumentation option provided by ppwmpicc does provide some flexibility for attributing performance information to specific regions of code in your program, sometimes simply having function-level performance information does not give you enough information to analyze your program. Rather, it might be useful to track time spent in a particular phase of your program's execution.
If you'd like to collect performance information for particular phases of your program's execution, you'll need to manually add calls to PPW's measurement API in your program. For full details on the MPI measurement API, see MPI Measurement API.