Difference between revisions of "Profiling"
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To profile Erlang programs for function call time use: | To profile Erlang programs for function call time use: | ||
<pre> | <pre> | ||
1> | 1> fprof:apply(fun mod:name/arity, [Args]). | ||
2> | 2> fprof:profile(). | ||
3> | 3> fprof:analyse(). | ||
</pre> | </pre> | ||
This is useful for sequential programs so that time taken by each function can be compared. | This is useful for sequential programs so that time taken by each function can be compared. | ||
Revision as of 01:34, 8 February 2014
<yambe:breadcrumb>Erlang|Erlang</yambe:breadcrumb>
Profiling
Function call time profiling
To profile Erlang programs for function call time use:
1> fprof:apply(fun mod:name/arity, [Args]). 2> fprof:profile(). 3> fprof:analyse().
This is useful for sequential programs so that time taken by each function can be compared.
Concurrency profiling
To profile Erlang programs for concurrency use:
1> percept:profile("test.dat", {Mod, Fun, Args_list}, [procs]).
2> percept:analyze("test.dat").
3> percept:start_webserver(8888).
and then open http://localhost:8888/ to see the concurrency profile with number of processes spawned and runnable time for each process. For more information refer to percept app tutorial at http://www.erlang.org/doc/apps/percept/percept.pdf
Use "erl -man fprof" and see analysis example at end of man page for more details.
