1.
Achilles Xu
formalin14@gmail.com

2.
Contents
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3.
• I/O CPU
/ CPU
• I/O
CPU
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/

4.
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5.
• linux win
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• top
cpu

6.
my @urllist = read_list();
my @pids;
for my $url (@urllist) {
my $pid = fork();
if ($pid == 0) {
print get($url);
exit;
} elsif ($pid > 0) {
push @pids, $pid; # ID
}
}
waitpid($_, ...) for @pids; #
# do other nonconcurrent jobs

7.
my @pids;
for ( 1 .. 20) {
my $pid = fork;
if ($pid == 0) {
while (1) {
my $task = lock_and_get_task();
do_task($task);
sleep 1;
}
exit;
} elsif ($pid > 0) {
push @pids, $pid;
}
}
waitpid($_, ...) for @pids;

8.
•
• top cpu
• perl 5.8.5 perl 5.8.8
LWP

9.
use threads;
sub load_url {
print get($_[0]);
}
my @urllist = read_url_list();
my @tids;
for my $url (@urllist) {
my $tid = threads->create(&load_url, $url);
push @tids, $tid; # ID
}
$_->join for @tids; # waitpid
# do other things

10.
use threads;
use threads::shared;
my @queue : shared;
for (1 .. 6) {
threads->create( sub {
while (1) {
my $task;
{ lock @queue;
$task = shift @queue;
}
do_task($task);
threads::sleep(1);
}
}
}
while (1) { generate_task(@queue); threads::sleep(1); }

11.
java.lang.Thread
• linux windows
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12.
• C Python GIL
• Coro Coroutines
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13.
Coro
• I/O CPU
• cede CPU
• Perl6 async

14.
Coro
use Coro;
async {
# some asynchronous thread of execution
print "2n";
cede; # yield back to main
print "4n";
};
print "1n";
cede; # yield to coro
print "3n";
cede; # and again

15.
• I/O
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•
•

16.
• select
• poll select
• epoll I/O
• I/O
sendfile

17.
• POE
• Twisted
• AnyEvent
• Java NIO

18.
POE
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• yield
• Session
• $heap
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19.
POE
sub handler_increment {
my ($kernel, $heap, $session) = @_
[KERNEL, HEAP, SESSION];
print "Session ", $session->ID, "
counted to ", ++$heap->{count}, ".n";
$kernel->yield('increment') if
$heap->{count} < 10;
}

20.
Twisted
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• POE N
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• dns connect send
request got first byte.... hook
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21.
Twisted
d = conect_to_server()
d.addCallback(login_user)
d.addErrback(reconnect_to_server)
reactor.run()

22.
AnyEvent
• libevent
EV
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• Coro POE

23.
Java NIO
• linux windows
• Channel

24.
• Squid 2.x
• Apache
• Nginx

25.
Squid 2.x
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• sendfile
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• COSS
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26.
Apache
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• php

27.
Nginx
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• epoll kqueue sendfile writev
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28.
• Questions