This library provides predicates to obtain information about resource usage by your program. The predicates of this library are for human use at the toplevel: information is printed. All predicates obtain their information using public low-level primitives. These primitives can be use to obtain selective statistics during execution.

 statistics is det

Print information about resource usage using print_message/2.

See also

- All statistics printed are obtained through statistics/2.

 statistics(-Stats:dict) is det

Stats is a dict representing the same information as statistics/0. This convience function is primarily intended to pass statistical information to e.g., a web client. Time critical code that wishes to collect statistics typically only need a small subset and should use statistics/2 to obtain exactly the data they need.

 thread_statistics(?Thread, -Stats:dict) is nondet

Obtain statistical information about a single thread. Fails silently of the Thread is no longer alive.

Arguments:

Stats

- is a dict containing status, time and stack-size information about Thread.

 time(:Goal) is nondet

Execute Goal, reporting statistics to the user. If Goal succeeds non-deterministically, retrying reports the statistics for providing the next answer.

Statistics are retrieved using thread_statistics/3 on the calling thread. Note that not all systems support thread-specific CPU time. Notable, this is lacking on MacOS X.

See also

- statistics/2 for obtaining statistics in your program and understanding the reported values.

bug

- Inference statistics are often a few off.

 profile(:Goal)

 profile(:Goal, +Options)

Run Goal under the execution profiler. Defined options are:

time(Which)

Profile cpu or wall time. The default is CPU time.

top(N)

When generating a textual report, show the top N predicates.

cumulative(Bool)

If true (default false), show cumulative output in a textual report.

 show_profile(+Options)

Display last collected profiling data. Options are

top(N)

When generating a textual report, show the top N predicates.

cumulative(Bool)

If true (default false), show cumulative output in a textual report.

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 profile(Arg1, Arg2)