ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/AnyEvent/lib/AnyEvent.pm
(Generate patch)

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.68 by root, Fri Apr 25 07:14:33 2008 UTC vs.
Revision 1.71 by root, Fri Apr 25 07:29:42 2008 UTC

… …
864 864
865 865
866=head1 BENCHMARK 866=head1 BENCHMARK
867 867
868To give you an idea of the performance and overheads that AnyEvent adds 868To give you an idea of the performance and overheads that AnyEvent adds
869over the event loops themselves (and to give you an impression of the
869over the event loops directly, here is a benchmark of various supported 870speed of various event loops), here is a benchmark of various supported
870event models natively and with anyevent. The benchmark creates a lot of 871event models natively and with anyevent. The benchmark creates a lot of
871timers (with a zero timeout) and io watchers (watching STDOUT, a pty, to 872timers (with a zero timeout) and io watchers (watching STDOUT, a pty, to
872become writable, which it is), lets them fire exactly once and destroys 873become writable, which it is), lets them fire exactly once and destroys
873them again. 874them again.
874 875
875=head2 Explanation of the fields 876=head2 Explanation of the columns
876 877
877I<watcher> is the number of event watchers created/destroyed. Since 878I<watcher> is the number of event watchers created/destroyed. Since
878different event models feature vastly different performances, each event 879different event models feature vastly different performances, each event
879loop was given a number of watchers so that overall runtime is acceptable 880loop was given a number of watchers so that overall runtime is acceptable
880and similar between tested event loop (and keep them from crashing): Glib 881and similar between tested event loop (and keep them from crashing): Glib
… …
890all watchers, to avoid adding memory overhead. That means closure creation 891all watchers, to avoid adding memory overhead. That means closure creation
891and memory usage is not included in the figures. 892and memory usage is not included in the figures.
892 893
893I<invoke> is the time, in microseconds, used to invoke a simple 894I<invoke> is the time, in microseconds, used to invoke a simple
894callback. The callback simply counts down a Perl variable and after it was 895callback. The callback simply counts down a Perl variable and after it was
895invoked "watcher" times, it would C<< ->broadcast >> a condvar once. 896invoked "watcher" times, it would C<< ->broadcast >> a condvar once to
897signal the end of this phase.
896 898
897I<destroy> is the time, in microseconds, that it takes destroy a single 899I<destroy> is the time, in microseconds, that it takes to destroy a single
898watcher. 900watcher.
899 901
900=head2 Results 902=head2 Results
901 903
902 name watcher bytes create invoke destroy comment 904 name watcher bytes create invoke destroy comment
903 EV/EV 400000 244 0.56 0.46 0.31 EV native interface 905 EV/EV 400000 244 0.56 0.46 0.31 EV native interface
904 EV/Any 100000 610 3.52 0.91 0.75 906 EV/Any 100000 610 3.52 0.91 0.75 EV + AnyEvent watchers
905 CoroEV/Any 100000 610 3.49 0.92 0.75 coroutines + Coro::Signal 907 CoroEV/Any 100000 610 3.49 0.92 0.75 coroutines + Coro::Signal
906 Perl/Any 10000 654 4.64 1.22 0.77 pure perl implementation 908 Perl/Any 16000 654 4.64 1.22 0.77 pure perl implementation
907 Event/Event 10000 523 28.05 21.38 5.22 Event native interface 909 Event/Event 16000 523 28.05 21.38 0.86 Event native interface
908 Event/Any 10000 943 34.43 20.48 1.39 910 Event/Any 16000 943 34.43 20.48 1.39 Event + AnyEvent watchers
909 Glib/Any 16000 1357 96.99 12.55 55.51 quadratic behaviour 911 Glib/Any 16000 1357 96.99 12.55 55.51 quadratic behaviour
910 Tk/Any 2000 1855 27.01 66.61 14.03 SEGV with >> 2000 watchers 912 Tk/Any 2000 1855 27.01 66.61 14.03 SEGV with >> 2000 watchers
913 POE/Event 2000 6644 108.15 768.19 14.33 via POE::Loop::Event
911 POE/Select 2000 6343 94.69 807.65 562.69 POE::Loop::Select 914 POE/Select 2000 6343 94.69 807.65 562.69 via POE::Loop::Select
912 POE/Event 2000 6644 108.15 768.19 14.33 POE::Loop::Event
913 915
914=head2 Discussion 916=head2 Discussion
915 917
916The benchmark does I<not> measure scalability of the event loop very 918The benchmark does I<not> measure scalability of the event loop very
917well. For example, a select-based event loop (such as the pure perl one) 919well. For example, a select-based event loop (such as the pure perl one)

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines