On Thu, Mar 22, 2001 at 10:31:55AM -0800, Rob Bloodgood wrote:
> I'm curious,
> should I be using C<Event> in my program(s)?
>
> I can't find any specifics on yes or no, only that POE supports it. From
> what I've gleaned about POE's operation, the most complex part of it is
> state management/context switching. Since Event (task switching, async
> looping) is written in C, does that imply that my program will run faster
> simply by using Event?
I think Event gives you two benefits over POE's own select loop:
1. Safe signals. Event polls for signals in C, bypassing Perl's
problematic signal handlers and the coredumps they can cause.
2. Interoperability with other modules using Event.
POE with Event generally seems a little slower. It makes some sense,
since POE's record-keeping overhead is roughly constant both ways.
Frobbing Event in addition to that is extra work.
Here are benchmarks run on an Athlon 1GHz, using POE 0.1206 and Event
0.81. I think the differences between figures are wider on slower
machines. Anyone who wants to try the benchmark program on their own
systems should mail me off-list, and I'll pass along a copy.
eyrie:/usr/home/troc/perl/misc$ ./bench.perl
Using POE's select loop...
500000 posts in 33.057 seconds ( 15125.362 per second)
500000 dispatches in 106.736 seconds ( 4684.451 per second)
300000 alarms in 26.264 seconds ( 11422.307 per second)
100000 alarm_adds in 51.414 seconds ( 1944.996 per second)
100000 alarm_clears in 3.855 seconds ( 25941.804 per second)
100000 session creates in 36.550 seconds ( 2736.014 per second)
100000 session destroys in 96.578 seconds ( 1035.436 per second)
100000 select toggles in 25.488 seconds ( 3923.346 per second)
1000000 calls in 22.905 seconds ( 43658.855 per second)
200000 single_posts in 32.030 seconds ( 6244.179 per second)
100 startups in 32.529 seconds ( 3.074 per second)
--- times ---
wall : 467.992
user : 415.070 cuser: 29.984
sys : 14.992 csys : 2.047
eyrie:/usr/home/troc/perl/misc$ ./bench.perl event
Using Event...
500000 posts in 33.365 seconds ( 14985.728 per second)
500000 dispatches in 106.031 seconds ( 4715.597 per second)
300000 alarms in 26.838 seconds ( 11178.158 per second)
100000 alarm_adds in 52.419 seconds ( 1907.700 per second)
100000 alarm_clears in 3.917 seconds ( 25530.844 per second)
100000 session creates in 36.620 seconds ( 2730.728 per second)
100000 session destroys in 96.144 seconds ( 1040.104 per second)
100000 select toggles in 26.035 seconds ( 3841.018 per second)
1000000 calls in 23.077 seconds ( 43332.370 per second)
200000 single_posts in 32.997 seconds ( 6061.075 per second)
100 startups in 33.612 seconds ( 2.975 per second)
--- times ---
wall : 471.835
user : 415.758 cuser: 30.062
sys : 15.258 csys : 2.203
-- Rocco Caputo / [EMAIL PROTECTED] / poe.perl.org / poe.sourceforge.net
