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Revision 1.276 by root, Sun Aug 9 10:53:33 2009 UTC vs.
Revision 1.287 by root, Tue Aug 25 12:05:30 2009 UTC

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592 after => 1, 592 after => 1,
593 cb => sub { $result_ready->send }, 593 cb => sub { $result_ready->send },
594 ); 594 );
595 595
596 # this "blocks" (while handling events) till the callback 596 # this "blocks" (while handling events) till the callback
597 # calls -<send 597 # calls ->send
598 $result_ready->recv; 598 $result_ready->recv;
599 599
600Example: wait for a timer, but take advantage of the fact that condition 600Example: wait for a timer, but take advantage of the fact that condition
601variables are also callable directly. 601variables are also callable directly.
602 602
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666one. For example, a function that pings many hosts in parallel might want 666one. For example, a function that pings many hosts in parallel might want
667to use a condition variable for the whole process. 667to use a condition variable for the whole process.
668 668
669Every call to C<< ->begin >> will increment a counter, and every call to 669Every call to C<< ->begin >> will increment a counter, and every call to
670C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end 670C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
671>>, the (last) callback passed to C<begin> will be executed. That callback 671>>, the (last) callback passed to C<begin> will be executed, passing the
672is I<supposed> to call C<< ->send >>, but that is not required. If no 672condvar as first argument. That callback is I<supposed> to call C<< ->send
673callback was set, C<send> will be called without any arguments. 673>>, but that is not required. If no group callback was set, C<send> will
674be called without any arguments.
674 675
675You can think of C<< $cv->send >> giving you an OR condition (one call 676You can think of C<< $cv->send >> giving you an OR condition (one call
676sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND 677sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
677condition (all C<begin> calls must be C<end>'ed before the condvar sends). 678condition (all C<begin> calls must be C<end>'ed before the condvar sends).
678 679
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705begung can potentially be zero: 706begung can potentially be zero:
706 707
707 my $cv = AnyEvent->condvar; 708 my $cv = AnyEvent->condvar;
708 709
709 my %result; 710 my %result;
710 $cv->begin (sub { $cv->send (\%result) }); 711 $cv->begin (sub { shift->send (\%result) });
711 712
712 for my $host (@list_of_hosts) { 713 for my $host (@list_of_hosts) {
713 $cv->begin; 714 $cv->begin;
714 ping_host_then_call_callback $host, sub { 715 ping_host_then_call_callback $host, sub {
715 $result{$host} = ...; 716 $result{$host} = ...;
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1115 1116
1116BEGIN { AnyEvent::common_sense } 1117BEGIN { AnyEvent::common_sense }
1117 1118
1118use Carp (); 1119use Carp ();
1119 1120
1120our $VERSION = 4.92; 1121our $VERSION = '5.112';
1121our $MODEL; 1122our $MODEL;
1122 1123
1123our $AUTOLOAD; 1124our $AUTOLOAD;
1124our @ISA; 1125our @ISA;
1125 1126
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1168 [Prima:: => AnyEvent::Impl::POE::], 1169 [Prima:: => AnyEvent::Impl::POE::],
1169 # IO::Async is just too broken - we would need workarounds for its 1170 # IO::Async is just too broken - we would need workarounds for its
1170 # byzantine signal and broken child handling, among others. 1171 # byzantine signal and broken child handling, among others.
1171 # IO::Async is rather hard to detect, as it doesn't have any 1172 # IO::Async is rather hard to detect, as it doesn't have any
1172 # obvious default class. 1173 # obvious default class.
1173# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program 1174 [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1174# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program 1175 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1175# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program 1176 [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
1177 [AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1176); 1178);
1177 1179
1178our %method = map +($_ => 1), 1180our %method = map +($_ => 1),
1179 qw(io timer time now now_update signal child idle condvar one_event DESTROY); 1181 qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1180 1182
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1287 # we assume CLOEXEC is already set by perl in all important cases 1289 # we assume CLOEXEC is already set by perl in all important cases
1288 1290
1289 ($fh2, $rw) 1291 ($fh2, $rw)
1290} 1292}
1291 1293
1292############################################################################# 1294=head1 SIMPLIFIED AE API
1293# "new" API, currently only emulation of it 1295
1294############################################################################# 1296Starting with version 5.0, AnyEvent officially supports a second, much
1297simpler, API that is designed to reduce the calling, typing and memory
1298overhead.
1299
1300See the L<AE> manpage for details.
1301
1302=cut
1295 1303
1296package AE; 1304package AE;
1297 1305
1298our $VERSION = $AnyEvent::VERSION; 1306our $VERSION = $AnyEvent::VERSION;
1299 1307
1300sub io($$$) { 1308sub io($$$) {
1301 AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2]) 1309 AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1302} 1310}
1303 1311
1304sub timer($$$) { 1312sub timer($$$) {
1305 AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2]); 1313 AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
1306} 1314}
1307 1315
1308sub signal($$) { 1316sub signal($$) {
1309 AnyEvent->signal (signal => $_[0], cb => $_[1]); 1317 AnyEvent->signal (signal => $_[0], cb => $_[1])
1310} 1318}
1311 1319
1312sub child($$) { 1320sub child($$) {
1313 AnyEvent->child (pid => $_[0], cb => $_[1]); 1321 AnyEvent->child (pid => $_[0], cb => $_[1])
1314} 1322}
1315 1323
1316sub idle($) { 1324sub idle($) {
1317 AnyEvent->idle (cb => $_[0]); 1325 AnyEvent->idle (cb => $_[0])
1318} 1326}
1319 1327
1320sub cv(;&) { 1328sub cv(;&) {
1321 AnyEvent->condvar (@_ ? (cb => $_[0]) : ()) 1329 AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1322} 1330}
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1904 warn "read: $input\n"; # output what has been read 1912 warn "read: $input\n"; # output what has been read
1905 $cv->send if $input =~ /^q/i; # quit program if /^q/i 1913 $cv->send if $input =~ /^q/i; # quit program if /^q/i
1906 }, 1914 },
1907 ); 1915 );
1908 1916
1909 my $time_watcher; # can only be used once
1910
1911 sub new_timer {
1912 $timer = AnyEvent->timer (after => 1, cb => sub { 1917 my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1913 warn "timeout\n"; # print 'timeout' about every second 1918 warn "timeout\n"; # print 'timeout' at most every second
1914 &new_timer; # and restart the time
1915 }); 1919 });
1916 }
1917
1918 new_timer; # create first timer
1919 1920
1920 $cv->recv; # wait until user enters /^q/i 1921 $cv->recv; # wait until user enters /^q/i
1921 1922
1922=head1 REAL-WORLD EXAMPLE 1923=head1 REAL-WORLD EXAMPLE
1923 1924
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2054through AnyEvent. The benchmark creates a lot of timers (with a zero 2055through AnyEvent. The benchmark creates a lot of timers (with a zero
2055timeout) and I/O watchers (watching STDOUT, a pty, to become writable, 2056timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
2056which it is), lets them fire exactly once and destroys them again. 2057which it is), lets them fire exactly once and destroys them again.
2057 2058
2058Source code for this benchmark is found as F<eg/bench> in the AnyEvent 2059Source code for this benchmark is found as F<eg/bench> in the AnyEvent
2059distribution. 2060distribution. It uses the L<AE> interface, which makes a real difference
2061for the EV and Perl backends only.
2060 2062
2061=head3 Explanation of the columns 2063=head3 Explanation of the columns
2062 2064
2063I<watcher> is the number of event watchers created/destroyed. Since 2065I<watcher> is the number of event watchers created/destroyed. Since
2064different event models feature vastly different performances, each event 2066different event models feature vastly different performances, each event
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2085watcher. 2087watcher.
2086 2088
2087=head3 Results 2089=head3 Results
2088 2090
2089 name watchers bytes create invoke destroy comment 2091 name watchers bytes create invoke destroy comment
2090 EV/EV 400000 224 0.47 0.35 0.27 EV native interface 2092 EV/EV 100000 223 0.47 0.43 0.27 EV native interface
2091 EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers 2093 EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
2092 CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal 2094 Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
2093 Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation 2095 Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
2094 Event/Event 16000 517 32.20 31.80 0.81 Event native interface 2096 Event/Event 16000 516 31.16 31.84 0.82 Event native interface
2095 Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers 2097 Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
2096 IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll 2098 IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
2097 IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll 2099 IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
2098 Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour 2100 Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
2099 Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers 2101 Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
2100 POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event 2102 POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
2101 POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select 2103 POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
2102 2104
2103=head3 Discussion 2105=head3 Discussion
2104 2106
2105The benchmark does I<not> measure scalability of the event loop very 2107The benchmark does I<not> measure scalability of the event loop very
2106well. For example, a select-based event loop (such as the pure perl one) 2108well. For example, a select-based event loop (such as the pure perl one)
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2118benchmark machine, handling an event takes roughly 1600 CPU cycles with 2120benchmark machine, handling an event takes roughly 1600 CPU cycles with
2119EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU 2121EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
2120cycles with POE. 2122cycles with POE.
2121 2123
2122C<EV> is the sole leader regarding speed and memory use, which are both 2124C<EV> is the sole leader regarding speed and memory use, which are both
2123maximal/minimal, respectively. Even when going through AnyEvent, it uses 2125maximal/minimal, respectively. When using the L<AE> API there is zero
2126overhead (when going through the AnyEvent API create is about 5-6 times
2127slower, with other times being equal, so still uses far less memory than
2124far less memory than any other event loop and is still faster than Event 2128any other event loop and is still faster than Event natively).
2125natively.
2126 2129
2127The pure perl implementation is hit in a few sweet spots (both the 2130The pure perl implementation is hit in a few sweet spots (both the
2128constant timeout and the use of a single fd hit optimisations in the perl 2131constant timeout and the use of a single fd hit optimisations in the perl
2129interpreter and the backend itself). Nevertheless this shows that it 2132interpreter and the backend itself). Nevertheless this shows that it
2130adds very little overhead in itself. Like any select-based backend its 2133adds very little overhead in itself. Like any select-based backend its
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2204In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100 2207In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2205(1%) are active. This mirrors the activity of large servers with many 2208(1%) are active. This mirrors the activity of large servers with many
2206connections, most of which are idle at any one point in time. 2209connections, most of which are idle at any one point in time.
2207 2210
2208Source code for this benchmark is found as F<eg/bench2> in the AnyEvent 2211Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2209distribution. 2212distribution. It uses the L<AE> interface, which makes a real difference
2213for the EV and Perl backends only.
2210 2214
2211=head3 Explanation of the columns 2215=head3 Explanation of the columns
2212 2216
2213I<sockets> is the number of sockets, and twice the number of "servers" (as 2217I<sockets> is the number of sockets, and twice the number of "servers" (as
2214each server has a read and write socket end). 2218each server has a read and write socket end).
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2222a new one that moves the timeout into the future. 2226a new one that moves the timeout into the future.
2223 2227
2224=head3 Results 2228=head3 Results
2225 2229
2226 name sockets create request 2230 name sockets create request
2227 EV 20000 69.01 11.16 2231 EV 20000 62.66 7.99
2228 Perl 20000 73.32 35.87 2232 Perl 20000 68.32 32.64
2229 IOAsync 20000 157.00 98.14 epoll 2233 IOAsync 20000 174.06 101.15 epoll
2230 IOAsync 20000 159.31 616.06 poll 2234 IOAsync 20000 174.67 610.84 poll
2231 Event 20000 212.62 257.32 2235 Event 20000 202.69 242.91
2232 Glib 20000 651.16 1896.30 2236 Glib 20000 557.01 1689.52
2233 POE 20000 349.67 12317.24 uses POE::Loop::Event 2237 POE 20000 341.54 12086.32 uses POE::Loop::Event
2234 2238
2235=head3 Discussion 2239=head3 Discussion
2236 2240
2237This benchmark I<does> measure scalability and overall performance of the 2241This benchmark I<does> measure scalability and overall performance of the
2238particular event loop. 2242particular event loop.

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