Obtaining statistics

To enable collecting statistics, run the application with the version.instrument configuration variable set to stats. This variant collects timing statistics.

By default, the statistics are emitted to the standard error when the program ends. The output can be sent to a file through the instrument.stats.output_file configuration option.

The contents of the output contains the average for each task type and the total task average of the following metrics:

• Number of instances

• Mean instantiation time

• Mean pending time (not ready due to dependencies)

• Mean ready time

• Mean execution time

• Mean blocked time (due to a critical or a taskwait)

• Mean zombie time (finished but not yet destroyed)

• Mean lifetime (time between creation and destruction)

The output also contains information about:

• Number of CPUs

• Total number of threads

• Mean threads per CPU

• Mean tasks per thread

• Mean thread lifetime

• Mean thread running time

Most codes consist of an initialization phase, a calculation phase and final phase for verification or writing the results. Usually these phases are separated by a taskwait. The runtime uses the taskwaits at the outermost level to identify phases and emit individual metrics for each phase.