[ViewVC] Diff of: cvs/IO-AIO/AIO.pm

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs.
Revision 1.71 by root, Tue Oct 24 11:57:30 2006 UTC

…		…
18	};	18	};
19		19
20	# version 2+ has request and group objects	20	# version 2+ has request and group objects
21	use IO::AIO 2;	21	use IO::AIO 2;
22		22
		23	aioreq_pri 4; # give next request a very high priority
23	my $req = aio_unlink "/tmp/file", sub { };	24	my $req = aio_unlink "/tmp/file", sub { };
24	$req->cancel; # cancel request if still in queue	25	$req->cancel; # cancel request if still in queue
25		26
26	my $grp = aio_group sub { print "all stats done\n" };	27	my $grp = aio_group sub { print "all stats done\n" };
27	add $grp aio_stat "..." for ...;	28	add $grp aio_stat "..." for ...;
…		…
51		52
52	This module implements asynchronous I/O using whatever means your	53	This module implements asynchronous I/O using whatever means your
53	operating system supports.	54	operating system supports.
54		55
55	Currently, a number of threads are started that execute your read/writes	56	Currently, a number of threads are started that execute your read/writes
56	and signal their completion. You don't need thread support in your libc or	57	and signal their completion. You don't need thread support in perl, and
57	perl, and the threads created by this module will not be visible to the	58	the threads created by this module will not be visible to perl. In the
58	pthreads library. In the future, this module might make use of the native	59	future, this module might make use of the native aio functions available
59	aio functions available on many operating systems. However, they are often	60	on many operating systems. However, they are often not well-supported
60	not well-supported (Linux doesn't allow them on normal files currently,	61	(Linux doesn't allow them on normal files currently, for example),
61	for example), and they would only support aio_read and aio_write, so the	62	and they would only support aio_read and aio_write, so the remaining
62	remaining functionality would have to be implemented using threads anyway.	63	functionality would have to be implemented using threads anyway.
63		64
64	Although the module will work with in the presence of other threads, it is	65	Although the module will work with in the presence of other threads,
65	currently not reentrant, so use appropriate locking yourself, always call	66	it is currently not reentrant in any way, so use appropriate locking
66	C<poll_cb> from within the same thread, or never call C<poll_cb> (or other	67	yourself, always call C<poll_cb> from within the same thread, or never
67	C<aio_> functions) recursively.	68	call C<poll_cb> (or other C<aio_> functions) recursively.
68		69
69	=cut	70	=cut
70		71
71	package IO::AIO;	72	package IO::AIO;
72		73
…		…
76	use base 'Exporter';	77	use base 'Exporter';
77		78
78	BEGIN {	79	BEGIN {
79	our $VERSION = '2.0';	80	our $VERSION = '2.0';
80		81
81	our @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat	82	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
82	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink	83	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
83	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move	84	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move
84	aio_group);	85	aio_group aio_nop);
85	our @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs);	86	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
		87	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
		88	min_parallel max_parallel max_outstanding nreqs);
86		89
87	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	90	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
88		91
89	require XSLoader;	92	require XSLoader;
90	XSLoader::load ("IO::AIO", $VERSION);	93	XSLoader::load ("IO::AIO", $VERSION);
…		…
121	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	124	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
122	use something else.	125	use something else.
123		126
124	=over 4	127	=over 4
125		128
		129	=item aioreq_pri $pri
		130
		131	Sets the priority for the next aio request. The default priority
		132	is C<0>, the minimum and maximum priorities are C<-4> and C<4>,
		133	respectively. Requests with higher priority will be serviced first.
		134
		135	The priority will be reset to C<0> after each call to one of the C<aio_>
		136	functions.
		137
		138	Example: open a file with low priority, then read something from it with
		139	higher priority so the read request is serviced before other low priority
		140	open requests (potentially spamming the cache):
		141
		142	aioreq_pri -3;
		143	aio_open ..., sub {
		144	return unless $_[0];
		145
		146	aioreq_pri -2;
		147	aio_read $_[0], ..., sub {
		148	...
		149	};
		150	};
		151
		152	=item aioreq_nice $pri_adjust
		153
		154	Similar to C<aioreq_pri>, but subtracts the given value from the current
		155	priority, so effects are cumulative.
		156
126	=item aio_open $pathname, $flags, $mode, $callback->($fh)	157	=item aio_open $pathname, $flags, $mode, $callback->($fh)
127		158
128	Asynchronously open or create a file and call the callback with a newly	159	Asynchronously open or create a file and call the callback with a newly
129	created filehandle for the file.	160	created filehandle for the file.
130		161
…		…
201	=cut	232	=cut
202		233
203	sub aio_move($$$) {	234	sub aio_move($$$) {
204	my ($src, $dst, $cb) = @_;	235	my ($src, $dst, $cb) = @_;
205		236
206	my $grp = aio_group;	237	my $grp = aio_group $cb;
207		238
208	add $grp aio_rename $src, $dst, sub {	239	add $grp aio_rename $src, $dst, sub {
209	if ($_[0] && $! == EXDEV) {	240	if ($_[0] && $! == EXDEV) {
210	add $grp aio_open $src, O_RDONLY, 0, sub {	241	add $grp aio_open $src, O_RDONLY, 0, sub {
211	if (my $src_fh = $_[0]) {	242	if (my $src_fh = $_[0]) {
…		…
221	chmod $stat[2] & 07777, $dst_fh;	252	chmod $stat[2] & 07777, $dst_fh;
222	chown $stat[4], $stat[5], $dst_fh;	253	chown $stat[4], $stat[5], $dst_fh;
223	close $dst_fh;	254	close $dst_fh;
224		255
225	add $grp aio_unlink $src, sub {	256	add $grp aio_unlink $src, sub {
226	$cb->($_[0]);	257	$grp->result ($_[0]);
227	};	258	};
228	} else {	259	} else {
229	my $errno = $!;	260	my $errno = $!;
230	add $grp aio_unlink $dst, sub {	261	add $grp aio_unlink $dst, sub {
231	$! = $errno;	262	$! = $errno;
232	$cb->(-1);	263	$grp->result (-1);
233	};	264	};
234	}	265	}
235	};	266	};
236	} else {	267	} else {
237	$cb->(-1);	268	$grp->result (-1);
238	}	269	}
239	},	270	},
240		271
241	} else {	272	} else {
242	$cb->(-1);	273	$grp->result (-1);
243	}	274	}
244	};	275	};
245	} else {	276	} else {
246	$cb->($_[0]);	277	$grp->result ($_[0]);
247	}	278	}
248	};	279	};
249		280
250	$grp	281	$grp
251	}	282	}
…		…
348	Scans a directory (similar to C<aio_readdir>) but additionally tries to	379	Scans a directory (similar to C<aio_readdir>) but additionally tries to
349	separate the entries of directory C<$path> into two sets of names, ones	380	separate the entries of directory C<$path> into two sets of names, ones
350	you can recurse into (directories or links to them), and ones you cannot	381	you can recurse into (directories or links to them), and ones you cannot
351	recurse into (everything else).	382	recurse into (everything else).
352		383
353	C<aio_scandir> is a composite request that consists of many sub	384	C<aio_scandir> is a composite request that creates of many sub requests_
354	requests. C<$maxreq> specifies the maximum number of outstanding aio	385	C<$maxreq> specifies the maximum number of outstanding aio requests that
355	requests that this function generates. If it is C<< <= 0 >>, then a	386	this function generates. If it is C<< <= 0 >>, then a suitable default
356	suitable default will be chosen (currently 8).	387	will be chosen (currently 6).
357		388
358	On error, the callback is called without arguments, otherwise it receives	389	On error, the callback is called without arguments, otherwise it receives
359	two array-refs with path-relative entry names.	390	two array-refs with path-relative entry names.
360		391
361	Example:	392	Example:
…		…
398	=cut	429	=cut
399		430
400	sub aio_scandir($$$) {	431	sub aio_scandir($$$) {
401	my ($path, $maxreq, $cb) = @_;	432	my ($path, $maxreq, $cb) = @_;
402		433
403	my $grp = aio_group;	434	my $grp = aio_group $cb;
404		435
405	$maxreq = 8 if $maxreq <= 0;	436	$maxreq = 6 if $maxreq <= 0;
406		437
407	# stat once	438	# stat once
408	add $grp aio_stat $path, sub {	439	add $grp aio_stat $path, sub {
409	return $cb->() if $_[0];	440	return $grp->result () if $_[0];
410	my $now = time;	441	my $now = time;
411	my $hash1 = join ":", (stat _)[0,1,3,7,9];	442	my $hash1 = join ":", (stat _)[0,1,3,7,9];
412		443
413	# read the directory entries	444	# read the directory entries
414	add $grp aio_readdir $path, sub {	445	add $grp aio_readdir $path, sub {
415	my $entries = shift	446	my $entries = shift
416	or return $cb->();	447	or return $grp->result ();
417		448
418	# stat the dir another time	449	# stat the dir another time
419	add $grp aio_stat $path, sub {	450	add $grp aio_stat $path, sub {
420	my $hash2 = join ":", (stat _)[0,1,3,7,9];	451	my $hash2 = join ":", (stat _)[0,1,3,7,9];
421		452
…		…
426	$ndirs = -1;	457	$ndirs = -1;
427	} else {	458	} else {
428	# if nlink == 2, we are finished	459	# if nlink == 2, we are finished
429	# on non-posix-fs's, we rely on nlink < 2	460	# on non-posix-fs's, we rely on nlink < 2
430	$ndirs = (stat _)[3] - 2	461	$ndirs = (stat _)[3] - 2
431	or return $cb->([], $entries);	462	or return $grp->result ([], $entries);
432	}	463	}
433		464
434	# sort into likely dirs and likely nondirs	465	# sort into likely dirs and likely nondirs
435	# dirs == files without ".", short entries first	466	# dirs == files without ".", short entries first
436	$entries = [map $_->[0],	467	$entries = [map $_->[0],
…		…
441	my (@dirs, @nondirs);	472	my (@dirs, @nondirs);
442		473
443	my ($statcb, $schedcb);	474	my ($statcb, $schedcb);
444	my $nreq = 0;	475	my $nreq = 0;
445		476
		477	my $statgrp = add $grp aio_group;
		478
446	$schedcb = sub {	479	$schedcb = sub {
447	if (@$entries) {	480	if (@$entries) {
448	if ($nreq < $maxreq) {	481	if ($nreq < $maxreq) {
449	my $ent = pop @$entries;	482	my $ent = pop @$entries;
450	$nreq++;	483	$nreq++;
451	add $grp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };	484	add $statgrp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
452	}	485	}
453	} elsif (!$nreq) {	486	} elsif (!$nreq) {
454	# finished	487	# finished
		488	$statgrp->cancel;
455	undef $statcb;	489	undef $statcb;
456	undef $schedcb;	490	undef $schedcb;
457	$cb->(\@dirs, \@nondirs) if $cb;	491	$grp->result (\@dirs, \@nondirs);
458	undef $cb;
459	}	492	}
460	};	493	};
461	$statcb = sub {	494	$statcb = sub {
462	my ($status, $entry) = @_;	495	my ($status, $entry) = @_;
463		496
…		…
505	callback with the fdatasync result code.	538	callback with the fdatasync result code.
506		539
507	If this call isn't available because your OS lacks it or it couldn't be	540	If this call isn't available because your OS lacks it or it couldn't be
508	detected, it will be emulated by calling C<fsync> instead.	541	detected, it will be emulated by calling C<fsync> instead.
509		542
510	=item aio_group $callback->()	543	=item aio_group $callback->(...)
511		544
512	[EXPERIMENTAL]	545	[EXPERIMENTAL]
513		546
514	This is a very special aio request: Instead of doing something, it is a	547	This is a very special aio request: Instead of doing something, it is a
515	container for other aio requests, which is useful if you want to bundle	548	container for other aio requests, which is useful if you want to bundle
516	many requests into a single, composite, request.	549	many requests into a single, composite, request with a definite callback
		550	and the ability to cancel the whole request with its subrequests.
517		551
518	Returns an object of class L<IO::AIO::GRP>. See its documentation below	552	Returns an object of class L<IO::AIO::GRP>. See its documentation below
519	for more info.	553	for more info.
520		554
521	Example:	555	Example:
…		…
527	add $grp	561	add $grp
528	(aio_stat ...),	562	(aio_stat ...),
529	(aio_stat ...),	563	(aio_stat ...),
530	...;	564	...;
531		565
		566	=item aio_nop $callback->()
		567
		568	This is a special request - it does nothing in itself and is only used for
		569	side effects, such as when you want to add a dummy request to a group so
		570	that finishing the requests in the group depends on executing the given
		571	code.
		572
		573	While this request does nothing, it still goes through the execution
		574	phase and still requires a worker thread. Thus, the callback will not
		575	be executed immediately but only after other requests in the queue have
		576	entered their execution phase. This can be used to measure request
		577	latency.
		578
532	=item IO::AIO::aio_sleep $fractional_seconds, $callback->() NOT EXPORTED	579	=item IO::AIO::aio_busy $fractional_seconds, $callback->() NOT EXPORTED
533		580
534	Mainly used for debugging and benchmarking, this aio request puts one of	581	Mainly used for debugging and benchmarking, this aio request puts one of
535	the request workers to sleep for the given time.	582	the request workers to sleep for the given time.
536		583
537	While it is theoretically handy to have simple I/O scheduling requests	584	While it is theoretically handy to have simple I/O scheduling requests
538	like sleep and file handle readable/writable, the overhead this creates	585	like sleep and file handle readable/writable, the overhead this creates is
539	is immense, so do not use this function except to put your application	586	immense (it blocks a thread for a long time) so do not use this function
540	under artificial I/O pressure.	587	except to put your application under artificial I/O pressure.
541		588
542	=back	589	=back
543		590
544	=head2 IO::AIO::REQ CLASS	591	=head2 IO::AIO::REQ CLASS
545		592
…		…
554	callback) and B<done> (request has reached the end of its lifetime and	601	callback) and B<done> (request has reached the end of its lifetime and
555	holds no resources anymore).	602	holds no resources anymore).
556		603
557	=over 4	604	=over 4
558		605
559	=item $req->cancel	606	=item cancel $req
560		607
561	Cancels the request, if possible. Has the effect of skipping execution	608	Cancels the request, if possible. Has the effect of skipping execution
562	when entering the B<execute> state and skipping calling the callback when	609	when entering the B<execute> state and skipping calling the callback when
563	entering the the B<result> state, but will leave the request otherwise	610	entering the the B<result> state, but will leave the request otherwise
564	untouched. That means that requests that currently execute will not be	611	untouched. That means that requests that currently execute will not be
565	stopped and resources held by the request will not be freed prematurely.	612	stopped and resources held by the request will not be freed prematurely.
566		613
		614	=item cb $req $callback->(...)
		615
		616	Replace (or simply set) the callback registered to the request.
		617
567	=back	618	=back
568		619
569	=head2 IO::AIO::GRP CLASS	620	=head2 IO::AIO::GRP CLASS
570		621
571	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to	622	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to
…		…
585	You add requests by calling the C<add> method with one or more	636	You add requests by calling the C<add> method with one or more
586	C<IO::AIO::REQ> objects:	637	C<IO::AIO::REQ> objects:
587		638
588	$grp->add (aio_unlink "...");	639	$grp->add (aio_unlink "...");
589		640
590	add $grp aio_stat "...", sub { ... };	641	add $grp aio_stat "...", sub {
		642	$_[0] or return $grp->result ("error");
		643
		644	# add another request dynamically, if first succeeded
		645	add $grp aio_open "...", sub {
		646	$grp->result ("ok");
		647	};
		648	};
591		649
592	This makes it very easy to create composite requests (see the source of	650	This makes it very easy to create composite requests (see the source of
593	C<aio_move> for an application) that work and feel like simple requests.	651	C<aio_move> for an application) that work and feel like simple requests.
594		652
		653	=over 4
		654
595	The IO::AIO::GRP objects will be cleaned up during calls to	655	=item * The IO::AIO::GRP objects will be cleaned up during calls to
596	C<IO::AIO::poll_cb>, just like any other request.	656	C<IO::AIO::poll_cb>, just like any other request.
597		657
598	They can be canceled like any other request. Canceling will cancel not	658	=item * They can be canceled like any other request. Canceling will cancel not
599	just the request itself, but also all requests it contains.	659	only the request itself, but also all requests it contains.
600		660
601	They can also can also be added to other IO::AIO::GRP objects.	661	=item * They can also can also be added to other IO::AIO::GRP objects.
		662
		663	=item * You must not add requests to a group from within the group callback (or
		664	any later time).
		665
		666	=item * This does not harmonise well with C<max_outstanding>, so best do
		667	not combine C<aio_group> with it. Groups and feeders are recommended for
		668	this kind of concurrency-limiting.
		669
		670	=back
602		671
603	Their lifetime, simplified, looks like this: when they are empty, they	672	Their lifetime, simplified, looks like this: when they are empty, they
604	will finish very quickly. If they contain only requests that are in the	673	will finish very quickly. If they contain only requests that are in the
605	C<done> state, they will also finish. Otherwise they will continue to	674	C<done> state, they will also finish. Otherwise they will continue to
606	exist.	675	exist.
607		676
		677	That means after creating a group you have some time to add requests. And
		678	in the callbacks of those requests, you can add further requests to the
		679	group. And only when all those requests have finished will the the group
		680	itself finish.
		681
608	=over 4	682	=over 4
609		683
		684	=item add $grp ...
		685
610	=item $grp->add (...)	686	=item $grp->add (...)
611		687
612	=item add $grp ...	688	Add one or more requests to the group. Any type of L<IO::AIO::REQ> can
		689	be added, including other groups, as long as you do not create circular
		690	dependencies.
613		691
614	Add one or more	692	Returns all its arguments.
615	Cancels the request, if possible. Has the effect of skipping execution	693
616	when entering the B<execute> state and skipping calling the callback when	694	=item $grp->result (...)
617	entering the the B<result> state, but will leave the request otherwise	695
618	untouched. That means that requests that currently execute will not be	696	Set the result value(s) that will be passed to the group callback when all
619	stopped and resources held by the request will not be freed prematurely.	697	subrequests have finished. By default, no argument will be passed.
		698
		699	=item feed $grp $callback->($grp)
		700
		701	[VERY EXPERIMENTAL]
		702
		703	Sets a feeder/generator on this group: every group can have an attached
		704	generator that generates requests if idle. The idea behind this is that,
		705	although you could just queue as many requests as you want in a group,
		706	this might starve other requests for a potentially long time. For
		707	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>
		708	requests, delaying any later requests for a long time.
		709
		710	To avoid this, and allow incremental generation of requests, you can
		711	instead a group and set a feeder on it that generates those requests. The
		712	feed callback will be called whenever there are few enough (see C<limit>,
		713	below) requests active in the group itself and is expected to queue more
		714	requests.
		715
		716	The feed callback can queue as many requests as it likes (i.e. C<add> does
		717	not impose any limits).
		718
		719	If the feed does not queue more requests when called, it will be
		720	automatically removed from the group.
		721
		722	If the feed limit is C<0>, it will be set to C<2> automatically.
		723
		724	Example:
		725
		726	# stat all files in @files, but only ever use four aio requests concurrently:
		727
		728	my $grp = aio_group sub { print "finished\n" };
		729	limit $grp 4;
		730	feed $grp sub {
		731	my $file = pop @files
		732	or return;
		733
		734	add $grp aio_stat $file, sub { ... };
		735	};
		736
		737	=item limit $grp $num
		738
		739	Sets the feeder limit for the group: The feeder will be called whenever
		740	the group contains less than this many requests.
		741
		742	Setting the limit to C<0> will pause the feeding process.
620		743
621	=back	744	=back
622		745
623	=head2 SUPPORT FUNCTIONS	746	=head2 SUPPORT FUNCTIONS
624		747
…		…
682	IO::AIO::poll_wait, IO::AIO::poll_cb	805	IO::AIO::poll_wait, IO::AIO::poll_cb
683	if IO::AIO::nreqs;	806	if IO::AIO::nreqs;
684		807
685	=item IO::AIO::min_parallel $nthreads	808	=item IO::AIO::min_parallel $nthreads
686		809
687	Set the minimum number of AIO threads to C<$nthreads>. The current default	810	Set the minimum number of AIO threads to C<$nthreads>. The current
688	is C<4>, which means four asynchronous operations can be done at one time	811	default is C<8>, which means eight asynchronous operations can execute
689	(the number of outstanding operations, however, is unlimited).	812	concurrently at any one time (the number of outstanding requests,
		813	however, is unlimited).
690		814
691	IO::AIO starts threads only on demand, when an AIO request is queued and	815	IO::AIO starts threads only on demand, when an AIO request is queued and
692	no free thread exists.	816	no free thread exists.
693		817
694	It is recommended to keep the number of threads low, as some Linux	818	It is recommended to keep the number of threads relatively low, as some
695	kernel versions will scale negatively with the number of threads (higher	819	Linux kernel versions will scale negatively with the number of threads
696	parallelity => MUCH higher latency). With current Linux 2.6 versions, 4-32	820	(higher parallelity => MUCH higher latency). With current Linux 2.6
697	threads should be fine.	821	versions, 4-32 threads should be fine.
698		822
699	Under most circumstances you don't need to call this function, as the	823	Under most circumstances you don't need to call this function, as the
700	module selects a default that is suitable for low to moderate load.	824	module selects a default that is suitable for low to moderate load.
701		825
702	=item IO::AIO::max_parallel $nthreads	826	=item IO::AIO::max_parallel $nthreads
…		…
713		837
714	Under normal circumstances you don't need to call this function.	838	Under normal circumstances you don't need to call this function.
715		839
716	=item $oldnreqs = IO::AIO::max_outstanding $nreqs	840	=item $oldnreqs = IO::AIO::max_outstanding $nreqs
717		841
		842	[DEPRECATED]
		843
718	Sets the maximum number of outstanding requests to C<$nreqs>. If you	844	Sets the maximum number of outstanding requests to C<$nreqs>. If you
719	try to queue up more than this number of requests, the caller will block until	845	try to queue up more than this number of requests, the caller will block until
720	some requests have been handled.	846	some requests have been handled.
721		847
722	The default is very large, so normally there is no practical limit. If you	848	The default is very large, so normally there is no practical limit. If you
723	queue up many requests in a loop it often improves speed if you set	849	queue up many requests in a loop it often improves speed if you set
724	this to a relatively low number, such as C<100>.	850	this to a relatively low number, such as C<100>.
		851
		852	This function does not work well together with C<aio_group>'s, and their
		853	feeder interface is better suited to limiting concurrency, so do not use
		854	this function.
725		855
726	Under normal circumstances you don't need to call this function.	856	Under normal circumstances you don't need to call this function.
727		857
728	=back	858	=back
729		859
…		…
743	or return undef;	873	or return undef;
744		874
745	*$sym	875	*$sym
746	}	876	}
747		877
748	min_parallel 4;	878	min_parallel 8;
749		879
750	END {	880	END {
751	max_parallel 0;	881	max_parallel 0;
752	}	882	}
753		883
…		…
767		897
768	In short: the parent will, after a short pause, continue as if fork had	898	In short: the parent will, after a short pause, continue as if fork had
769	not been called, while the child will act as if IO::AIO has not been used	899	not been called, while the child will act as if IO::AIO has not been used
770	yet.	900	yet.
771		901
		902	=head2 MEMORY USAGE
		903
		904	Each aio request uses - depending on your architecture - around 128 bytes
		905	of memory. In addition, stat requests need a stat buffer (possibly a few
		906	hundred bytes). Perl scalars and other data passed into aio requests will
		907	also be locked.
		908
		909	This is now awfully much, so queuing lots of requests is not usually a
		910	problem.
		911
		912	Each thread needs a stack area which is usually around 16k, sometimes much
		913	larger, depending on the OS.
		914
772	=head1 SEE ALSO	915	=head1 SEE ALSO
773		916
774	L<Coro>, L<Linux::AIO> (obsolete).	917	L<Coro::AIO>.
775		918
776	=head1 AUTHOR	919	=head1 AUTHOR
777		920
778	Marc Lehmann <schmorp@schmorp.de>	921	Marc Lehmann <schmorp@schmorp.de>
779	http://home.schmorp.de/	922	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs. Revision 1.71 by root, Tue Oct 24 11:57:30 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs.
Revision 1.71 by root, Tue Oct 24 11:57:30 2006 UTC