The END Probe
The END probe fires after all other probes. This probe will not
fire until all other probe clauses have completed. This probe can be
used to process state that has been gathered or to format the
output. The printa() action is therefore often used in the END probe.
The BEGIN and END probes can be used together to measure the
total time spent tracing:
start = timestamp;
* ... other tracing actions...
printf("total time: %d secs", (timestamp - start) / 1000000000);
See Data Normalization and printa() for other common uses of the END probe.
As with the BEGIN probe, no arguments are defined for the END
probe. The context in which the END probe fires is arbitrary and
should not be depended upon.
When tracing with the bufpolicy option set to fill, adequate space is
reserved to accommodate any records traced in the END probe. See fill Policy and END Probes
Note - The exit() action causes tracing to stop and the END probe to
fire. However, there is some delay between the invocation of the exit()
action and the END probe firing. During this delay, no probes will
fire. After a probe invokes the exit() action, the END probe is
not fired until the DTrace consumer determines that exit() has been called
and stops tracing. The rate at which the exit status is checked
can be set using statusrate option. For more information, see Chapter 16, Options and Tunables.