[ViewVC] Diff of: cvs/OpenCL/OpenCL.pm

Comparing OpenCL/OpenCL.pm (file contents):
Revision 1.52 by root, Tue Apr 24 14:24:42 2012 UTC vs.
Revision 1.63 by root, Sun Apr 29 18:24:35 2012 UTC

…		…
43		43
44	OpenCL::Event objects are used to signal when something is complete.	44	OpenCL::Event objects are used to signal when something is complete.
45		45
46	=head2 HELPFUL RESOURCES	46	=head2 HELPFUL RESOURCES
47		47
48	The OpenCL spec used to develop this module (1.2 spec was available, but	48	The OpenCL specs used to develop this module:
49	no implementation was available to me :).
50		49
51	http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf	50	http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf
		51	http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf
		52	http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf
52		53
53	OpenCL manpages:	54	OpenCL manpages:
54		55
55	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/	56	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/
		57	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/
56		58
57	If you are into UML class diagrams, the following diagram might help - if	59	If you are into UML class diagrams, the following diagram might help - if
58	not, it will be mildly cobfusing:	60	not, it will be mildly confusing (also, the class hierarchy of this module
		61	is much more fine-grained):
59		62
60	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/classDiagram.html	63	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/classDiagram.html
61		64
62	Here's a tutorial from AMD (very AMD-centric, too), not sure how useful it	65	Here's a tutorial from AMD (very AMD-centric, too), not sure how useful it
63	is, but at least it's free of charge:	66	is, but at least it's free of charge:
64		67
65	http://developer.amd.com/zones/OpenCLZone/courses/Documents/Introduction_to_OpenCL_Programming%20Training_Guide%20%28201005%29.pdf	68	http://developer.amd.com/zones/OpenCLZone/courses/Documents/Introduction_to_OpenCL_Programming%20Training_Guide%20%28201005%29.pdf
…		…
138	=head2 Create a buffer with some predefined data, read it back synchronously,	141	=head2 Create a buffer with some predefined data, read it back synchronously,
139	then asynchronously.	142	then asynchronously.
140		143
141	my $buf = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, "helmut");	144	my $buf = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, "helmut");
142		145
143	$queue->enqueue_read_buffer ($buf, 1, 1, 3, my $data);	146	$queue->read_buffer ($buf, 1, 1, 3, my $data);
144	print "$data\n";	147	print "$data\n";
145		148
146	my $ev = $queue->enqueue_read_buffer ($buf, 0, 1, 3, my $data);	149	my $ev = $queue->read_buffer ($buf, 0, 1, 3, my $data);
147	$ev->wait;	150	$ev->wait;
148	print "$data\n"; # prints "elm"	151	print "$data\n"; # prints "elm"
149		152
150	=head2 Create and build a program, then create a kernel out of one of its	153	=head2 Create and build a program, then create a kernel out of one of its
151	functions.	154	functions.
…		…
171	# set buffer	174	# set buffer
172	$kernel->set_buffer (0, $input);	175	$kernel->set_buffer (0, $input);
173	$kernel->set_buffer (1, $output);	176	$kernel->set_buffer (1, $output);
174		177
175	# execute it for all 4 numbers	178	# execute it for all 4 numbers
176	$queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);	179	$queue->nd_range_kernel ($kernel, undef, [4], undef);
177		180
178	# enqueue a synchronous read	181	# enqueue a synchronous read
179	$queue->enqueue_read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);	182	$queue->read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
180		183
181	# print the results:	184	# print the results:
182	printf "%s\n", join ", ", unpack "f*", $data;	185	printf "%s\n", join ", ", unpack "f*", $data;
183		186
184	=head2 The same enqueue operations as before, but assuming an out-of-order queue,	187	=head2 The same enqueue operations as before, but assuming an out-of-order queue,
185	showing off barriers.	188	showing off barriers.
186		189
187	# execute it for all 4 numbers	190	# execute it for all 4 numbers
188	$queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);	191	$queue->nd_range_kernel ($kernel, undef, [4], undef);
189		192
190	# enqueue a barrier to ensure in-order execution	193	# enqueue a barrier to ensure in-order execution
191	$queue->enqueue_barrier;	194	$queue->barrier;
192		195
193	# enqueue an async read	196	# enqueue an async read
194	$queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);	197	$queue->read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
195		198
196	# wait for all requests to finish	199	# wait for all requests to finish
197	$queue->finish;	200	$queue->finish;
198		201
199	=head2 The same enqueue operations as before, but assuming an out-of-order queue,	202	=head2 The same enqueue operations as before, but assuming an out-of-order queue,
200	showing off event objects and wait lists.	203	showing off event objects and wait lists.
201		204
202	# execute it for all 4 numbers	205	# execute it for all 4 numbers
203	my $ev = $queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);	206	my $ev = $queue->nd_range_kernel ($kernel, undef, [4], undef);
204		207
205	# enqueue an async read	208	# enqueue an async read
206	$ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);	209	$ev = $queue->read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);
207		210
208	# wait for the last event to complete	211	# wait for the last event to complete
209	$ev->wait;	212	$ev->wait;
210		213
211	=head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia	214	=head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia
…		…
270		273
271	# program compiled, kernel ready, now draw and loop	274	# program compiled, kernel ready, now draw and loop
272		275
273	for (my $time; ; ++$time) {	276	for (my $time; ; ++$time) {
274	# acquire objects from opengl	277	# acquire objects from opengl
275	$queue->enqueue_acquire_gl_objects ([$tex]);	278	$queue->acquire_gl_objects ([$tex]);
276		279
277	# configure and run our kernel	280	# configure and run our kernel
278	$kernel->set_image2d (0, $tex);	281	$kernel->set_image2d (0, $tex);
279	$kernel->set_float (1, $time);	282	$kernel->set_float (1, $time);
280	$queue->enqueue_nd_range_kernel ($kernel, undef, [256, 256], undef);	283	$queue->nd_range_kernel ($kernel, undef, [256, 256], undef);
281		284
282	# release objects to opengl again	285	# release objects to opengl again
283	$queue->enqueue_release_gl_objects ([$tex]);	286	$queue->release_gl_objects ([$tex]);
284		287
285	# wait	288	# wait
286	$queue->finish;	289	$queue->finish;
287		290
288	# now draw the texture, the defaults should be all right	291	# now draw the texture, the defaults should be all right
…		…
376		379
377	For this to work, the OpenGL library must be loaded, a GLX context must	380	For this to work, the OpenGL library must be loaded, a GLX context must
378	have been created and be made current, and C<dlsym> must be available and	381	have been created and be made current, and C<dlsym> must be available and
379	capable of finding the function via C<RTLD_DEFAULT>.	382	capable of finding the function via C<RTLD_DEFAULT>.
380		383
		384	=head2 EVENT SYSTEM
		385
		386	OpenCL can generate a number of (potentially) asynchronous events, for
		387	example, after compiling a program, to signal a context-related error or,
		388	perhaps most important, to signal completion of queued jobs (by setting
		389	callbacks on OpenCL::Event objects).
		390
		391	To facilitate this, this module maintains an event queue - each
		392	time an asynchronous event happens, it is queued, and perl will be
		393	interrupted. This is implemented via the L<Async::Interrupt> module. In
		394	addition, this module has L<AnyEvent> support, so it can seamlessly
		395	integrate itself into many event loops.
		396
		397	Since this module is a bit hard to understand, here are some case examples:
		398
		399	=head3 Don't use callbacks.
		400
		401	When your program never uses any callbacks, then there will never be any
		402	notifications you need to take care of, and therefore no need to worry
		403	about all this.
		404
		405	You can achieve a great deal by explicitly waiting for events, or using
		406	barriers and flush calls. In many programs, there is no need at all to
		407	tinker with asynchronous events.
		408
		409	=head3 Use AnyEvent
		410
		411	This module automatically registers a watcher that invokes all outstanding
		412	event callbacks when AnyEvent is initialised (and block asynchronous
		413	interruptions). Using this mode of operations is the safest and most
		414	recommended one.
		415
		416	To use this, simply use AnyEvent and this module normally, make sure you
		417	have an event loop running:
		418
		419	use Gtk2 -init;
		420	use AnyEvent;
		421
		422	# initialise AnyEvent, by creating a watcher, or:
		423	AnyEvent::detect;
		424
		425	my $e = $queue->marker;
		426	$e->cb (sub {
		427	warn "opencl is finished\n";
		428	})
		429
		430	main Gtk2;
		431
		432	Note that this module will not initialise AnyEvent for you. Before
		433	AnyEvent is initialised, the module will asynchronously interrupt perl
		434	instead. To avoid any surprises, it's best to explicitly initialise
		435	AnyEvent.
		436
		437	You can temporarily enable asynchronous interruptions (see next paragraph)
		438	by calling C<$OpenCL::INTERRUPT->unblock> and disable them again by
		439	calling C<$OpenCL::INTERRUPT->block>.
		440
		441	=head3 Let yourself be interrupted at any time
		442
		443	This mode is the default unless AnyEvent is loaded and initialised. In
		444	this mode, OpenCL asynchronously interrupts a running perl program. The
		445	emphasis is on both I<asynchronously> and I<running> here.
		446
		447	Asynchronously means that perl might execute your callbacks at any
		448	time. For example, in the following code (I<THAT YOU SHOULD NOT COPY>),
		449	the C<until> loop following the marker call will be interrupted by the
		450	callback:
		451
		452	my $e = $queue->marker;
		453	my $flag;
		454	$e->cb (sub { $flag = 1 });
		455	1 until $flag;
		456	# $flag is now 1
		457
		458	The reason why you shouldn't blindly copy the above code is that
		459	busy waiting is a really really bad thing, and really really bad for
		460	performance.
		461
		462	While at first this asynchronous business might look exciting, it can be
		463	really hard, because you need to be prepared for the callback code to be
		464	executed at any time, which limits the amount of things the callback code
		465	can do safely.
		466
		467	This can be mitigated somewhat by using C<<
		468	$OpenCL::INTERRUPT->scope_block >> (see the L<Async::Interrupt>
		469	documentation for details).
		470
		471	The other problem is that your program must be actively I<running> to be
		472	interrupted. When you calculate stuff, your program is running. When you
		473	hang in some C functions or other block execution (by calling C<sleep>,
		474	C<select>, running an event loop and so on), your program is waiting, not
		475	running.
		476
		477	One way around that would be to attach a read watcher to your event loop,
		478	listening for events on C<< $OpenCL::INTERRUPT->pipe_fileno >>, using a
		479	dummy callback (C<sub { }>) to temporarily execute some perl code.
		480
		481	That is then awfully close to using the built-in AnyEvent support above,
		482	though, so consider that one instead.
		483
		484	=head3 Be creative
		485
		486	OpenCL exports the L<Async::Interrupt> object it uses in the global
		487	variable C<$OpenCL::INTERRUPT>. You can configure it in any way you like.
		488
		489	So if you want to feel like a real pro, err, wait, if you feel no risk
		490	menas no fun, you can experiment by implementing your own mode of
		491	operations.
		492
381	=cut	493	=cut
382		494
383	package OpenCL;	495	package OpenCL;
384		496
385	use common::sense;	497	use common::sense;
		498	use Carp ();
		499	use Async::Interrupt ();
		500
		501	our $POLL_FUNC; # set by XS
386		502
387	BEGIN {	503	BEGIN {
388	our $VERSION = '0.96';	504	our $VERSION = '0.98';
389		505
390	require XSLoader;	506	require XSLoader;
391	XSLoader::load (__PACKAGE__, $VERSION);	507	XSLoader::load (__PACKAGE__, $VERSION);
392		508
393	@OpenCL::Platform::ISA =	509	@OpenCL::Platform::ISA =
…		…
422	=item $int = OpenCL::errno	538	=item $int = OpenCL::errno
423		539
424	The last error returned by a function - it's only valid after an error occured	540	The last error returned by a function - it's only valid after an error occured
425	and before calling another OpenCL function.	541	and before calling another OpenCL function.
426		542
427	=item $str = OpenCL::err2str $errval	543	=item $str = OpenCL::err2str [$errval]
428		544
429	Comverts an error value into a human readable string.	545	Converts an error value into a human readable string. IF no error value is
		546	given, then the last error will be used (as returned by OpenCL::errno).
430		547
431	=item $str = OpenCL::enum2str $enum	548	=item $str = OpenCL::enum2str $enum
432		549
433	Converts most enum values (of parameter names, image format constants,	550	Converts most enum values (of parameter names, image format constants,
434	object types, addressing and filter modes, command types etc.) into a	551	object types, addressing and filter modes, command types etc.) into a
…		…
440		557
441	Returns all available OpenCL::Platform objects.	558	Returns all available OpenCL::Platform objects.
442		559
443	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformIDs.html>	560	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformIDs.html>
444		561
445	=item $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $notify = undef	562	=item $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr
446		563
447	Tries to create a context from a default device and platform - never worked for me.	564	Tries to create a context from a default device and platform type - never worked for me.
448		565
449	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>	566	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
450		567
		568	=item $ctx = OpenCL::context $properties, \@devices, $callback->($err, $pvt) = $print_stderr)
		569
		570	Create a new OpenCL::Context object using the given device object(s). This
		571	function isn't implemented yet, use C<< $platform->context >> instead.
		572
		573	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
		574
451	=item OpenCL::wait_for_events $wait_events...	575	=item OpenCL::wait_for_events $wait_events...
452		576
453	Waits for all events to complete.	577	Waits for all events to complete.
454		578
455	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>	579	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
		580
		581	=item OpenCL::poll
		582
		583	Checks if there are any outstanding events (see L<EVENT SYSTEM>) and
		584	invokes their callbacks.
		585
		586	=item $OpenCL::INTERRUPT
		587
		588	The L<Async::Interrupt> object used to signal asynchronous events (see
		589	L<EVENT SYSTEM>).
		590
		591	=cut
		592
		593	our $INTERRUPT = new Async::Interrupt c_cb => [$POLL_FUNC, 0];
		594
		595	&_eq_initialise ($INTERRUPT->signal_func);
		596
		597	=item $OpenCL::WATCHER
		598
		599	The L<AnyEvent> watcher object used to watch for asynchronous events (see
		600	L<EVENT SYSTEM>). This variable is C<undef> until L<AnyEvent> has been
		601	loaded I<and> initialised (e.g. by calling C<AnyEvent::detect>).
		602
		603	=cut
		604
		605	our $WATCHER;
		606
		607	sub _init_anyevent {
		608	$INTERRUPT->block;
		609	$WATCHER = AE::io ($INTERRUPT->pipe_fileno, 0, sub { $INTERRUPT->handle });
		610	}
		611
		612	if (defined $AnyEvent::MODEL) {
		613	_init_anyevent;
		614	} else {
		615	push @AnyEvent::post_detect, \&_init_anyevent;
		616	}
456		617
457	=back	618	=back
458		619
459	=head2 THE OpenCL::Object CLASS	620	=head2 THE OpenCL::Object CLASS
460		621
…		…
472	C<IV> type in your code and cast that to the correct type.	633	C<IV> type in your code and cast that to the correct type.
473		634
474	=cut	635	=cut
475		636
476	sub OpenCL::Object::id {	637	sub OpenCL::Object::id {
		638	ref $_[0] eq "SCALAR"
477	${$_[0]}	639	? ${ $_[0] }
		640	: $_[0][0]
478	}	641	}
479		642
480	=back	643	=back
481		644
482	=head2 THE OpenCL::Platform CLASS	645	=head2 THE OpenCL::Platform CLASS
…		…
485		648
486	=item @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL)	649	=item @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL)
487		650
488	Returns a list of matching OpenCL::Device objects.	651	Returns a list of matching OpenCL::Device objects.
489		652
490	=item $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $notify = undef)	653	=item $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr)
491		654
492	Tries to create a context. Never worked for me, and you need devices explicitly anyway.	655	Tries to create a context. Never worked for me, and you need devices explicitly anyway.
493		656
494	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>	657	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
495		658
496	=item $ctx = $platform->context ($properties = undef, @$devices, $notify = undef)	659	=item $ctx = $platform->context ($properties, \@devices, $callback->($err, $pvt) = $print_stderr)
497		660
498	Create a new OpenCL::Context object using the given device object(s)- a	661	Create a new OpenCL::Context object using the given device object(s)- a
499	CL_CONTEXT_PLATFORM property is supplied automatically.	662	CL_CONTEXT_PLATFORM property is supplied automatically.
500		663
501	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>	664	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
…		…
844	my ($self, $prog, $options) = @_;	1007	my ($self, $prog, $options) = @_;
845		1008
846	$prog = $self->program_with_source ($prog)	1009	$prog = $self->program_with_source ($prog)
847	unless ref $prog;	1010	unless ref $prog;
848		1011
		1012	eval { $prog->build (undef, $options); 1 }
		1013	or errno == BUILD_PROGRAM_FAILURE
		1014	or errno == INVALID_BINARY # workaround nvidia bug
		1015	or Carp::croak "OpenCL::Context->build_program: " . err2str;
		1016
		1017	# we check status for all devices
849	for my $dev ($self->devices) {	1018	for my $dev ($self->devices) {
850	eval { $prog->build ($dev, $options); 1 }	1019	$prog->build_status ($dev) == BUILD_SUCCESS
851	or Carp::croak "Building OpenCL program for device '" . $dev->name . "' failed:\n"	1020	or Carp::croak "Building OpenCL program for device '" . $dev->name . "' failed:\n"
852	. $prog->build_log ($dev);	1021	. $prog->build_log ($dev);
853	}	1022	}
854		1023
855	$prog	1024	$prog
856	}	1025	}
857		1026
…		…
881	=item $buf = $ctx->buffer_sv ($flags, $data)	1050	=item $buf = $ctx->buffer_sv ($flags, $data)
882		1051
883	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object and	1052	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object and
884	initialise it with the given data values.	1053	initialise it with the given data values.
885		1054
886	=item $img = $ctx->image ($self, $flags, $channel_order, $channel_type, $type, $width, $height, $depth, $array_size = 0, $row_pitch = 0, $slice_pitch = 0, $num_mip_level = 0, $num_samples = 0, $*data = &PL_sv_undef)	1055	=item $img = $ctx->image ($self, $flags, $channel_order, $channel_type, $type, $width, $height, $depth = 0, $array_size = 0, $row_pitch = 0, $slice_pitch = 0, $num_mip_level = 0, $num_samples = 0, $*data = &PL_sv_undef)
887		1056
888	Creates a new OpenCL::Image object and optionally initialises it with	1057	Creates a new OpenCL::Image object and optionally initialises it with
889	the given data values.	1058	the given data values.
890		1059
891	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateImage.html>	1060	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateImage.html>
…		…
987	=back	1156	=back
988		1157
989	=head2 THE OpenCL::Queue CLASS	1158	=head2 THE OpenCL::Queue CLASS
990		1159
991	An OpenCL::Queue represents an execution queue for OpenCL. You execute	1160	An OpenCL::Queue represents an execution queue for OpenCL. You execute
992	requests by calling their respective C<enqueue_xxx> method and waitinf for	1161	requests by calling their respective method and waiting for it to complete
993	it to complete in some way.	1162	in some way.
994		1163
995	All the enqueue methods return an event object that can be used to wait	1164	Most methods that enqueue some request return an event object that can
996	for completion, unless the method is called in void context, in which case	1165	be used to wait for completion (optionally using a callback), unless
997	no event object is created.	1166	the method is called in void context, in which case no event object is
		1167	created.
998		1168
999	They also allow you to specify any number of other event objects that this	1169	They also allow you to specify any number of other event objects that this
1000	request has to wait for before it starts executing, by simply passing the	1170	request has to wait for before it starts executing, by simply passing the
1001	event objects as extra parameters to the enqueue methods. To simplify	1171	event objects as extra parameters to the enqueue methods. To simplify
1002	program design, this module ignores any C<undef> values in the list of	1172	program design, this module ignores any C<undef> values in the list of
1003	events. This makes it possible to code operations such as this, without	1173	events. This makes it possible to code operations such as this, without
1004	having to put a valid event object into C<$event> first:	1174	having to put a valid event object into C<$event> first:
1005		1175
1006	$event = $queue->enqueue_xxx (..., $event);	1176	$event = $queue->xxx (..., $event);
1007		1177
1008	Queues execute in-order by default, without any parallelism, so in most	1178	Queues execute in-order by default, without any parallelism, so in most
1009	cases (i.e. you use only one queue) it's not necessary to wait for or	1179	cases (i.e. you use only one queue) it's not necessary to wait for or
1010	create event objects, althoguh an our of order queue is often a bit	1180	create event objects, althoguh an our of order queue is often a bit
1011	faster.	1181	faster.
1012		1182
1013	=over 4	1183	=over 4
1014		1184
1015	=item $ev = $queue->enqueue_read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)	1185	=item $ev = $queue->read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)
1016		1186
1017	Reads data from buffer into the given string.	1187	Reads data from buffer into the given string.
1018		1188
1019	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html>	1189	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html>
1020		1190
1021	=item $ev = $queue->enqueue_write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)	1191	=item $ev = $queue->write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)
1022		1192
1023	Writes data to buffer from the given string.	1193	Writes data to buffer from the given string.
1024		1194
1025	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBuffer.html>	1195	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBuffer.html>
1026		1196
1027	=item $ev = $queue->enqueue_copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)	1197	=item $ev = $queue->copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)
1028		1198
1029	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBuffer.html>	1199	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBuffer.html>
1030		1200
1031	=item $ev = $queue->enqueue_read_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)	1201	=item $ev = $queue->read_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)
1032		1202
1033	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBufferRect.html	1203	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBufferRect.html
1034		1204
1035	=item $ev = $queue->enqueue_write_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)	1205	=item $ev = $queue->write_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)
1036		1206
1037	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBufferRect.html	1207	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBufferRect.html
1038		1208
1039	=item $ev = $queue->enqueue_read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)	1209	=item $ev = $queue->read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
1040		1210
1041	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferRect.html>	1211	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferRect.html>
1042		1212
1043	=item $ev = $queue->enqueue_copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)	1213	=item $ev = $queue->copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
1044		1214
1045	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadImage.html>	1215	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadImage.html>
1046		1216
1047	=item $ev = $queue->enqueue_write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)	1217	=item $ev = $queue->write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
1048		1218
1049	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteImage.html>	1219	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteImage.html>
1050		1220
1051	=item $ev = $queue->enqueue_copy_image ($src_image, $dst_image, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)	1221	=item $ev = $queue->copy_image ($src_image, $dst_image, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
1052		1222
1053	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImage.html>	1223	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImage.html>
1054		1224
1055	=item $ev = $queue->enqueue_copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...)	1225	=item $ev = $queue->copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...)
1056		1226
1057	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImageToBuffer.html>	1227	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImageToBuffer.html>
1058		1228
1059	=item $ev = $queue->enqueue_copy_buffer_rect ($src, $dst, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $src_row_pitch, $src_slice_pitch, $dst_row_pitch, $dst_slice_pitch, $wait_event...)	1229	=item $ev = $queue->copy_buffer_rect ($src, $dst, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $src_row_pitch, $src_slice_pitch, $dst_row_pitch, $dst_slice_pitch, $wait_event...)
1060		1230
1061	Yeah.	1231	Yeah.
1062		1232
1063	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>.	1233	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>.
1064		1234
1065	=item $ev = $queue->enqueue_fill_buffer ($mem, $pattern, $offset, $size, ...)	1235	=item $ev = $queue->fill_buffer ($mem, $pattern, $offset, $size, ...)
1066		1236
1067	Fills the given buffer object with repeated applications of C<$pattern>,	1237	Fills the given buffer object with repeated applications of C<$pattern>,
1068	starting at C<$offset> for C<$size> octets.	1238	starting at C<$offset> for C<$size> octets.
1069		1239
1070	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillBuffer.html>	1240	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillBuffer.html>
1071		1241
1072	=item $ev = $queue->enqueue_fill_image ($img, $r, $g, $b, $a, $x, $y, $z, $width, $height, $depth, ...)	1242	=item $ev = $queue->fill_image ($img, $r, $g, $b, $a, $x, $y, $z, $width, $height, $depth, ...)
1073		1243
1074	Fills the given image area with the given rgba colour components. The	1244	Fills the given image area with the given rgba colour components. The
1075	components are normally floating point values between C<0> and C<1>,	1245	components are normally floating point values between C<0> and C<1>,
1076	except when the image channel data type is a signe dor unsigned	1246	except when the image channel data type is a signe dor unsigned
1077	unnormalised format, in which case the range is determined by the format.	1247	unnormalised format, in which case the range is determined by the format.
1078		1248
1079	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillImage.html>	1249	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillImage.html>
1080		1250
1081	=item $ev = $queue->enqueue_task ($kernel, $wait_events...)	1251	=item $ev = $queue->task ($kernel, $wait_events...)
1082		1252
1083	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueTask.html>	1253	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueTask.html>
1084		1254
1085	=item $ev = $queue->enqueue_nd_range_kernel ($kernel, @$global_work_offset, @$global_work_size, @$local_work_size, $wait_events...)	1255	=item $ev = $queue->nd_range_kernel ($kernel, \@global_work_offset, \@global_work_size, \@local_work_size, $wait_events...)
1086		1256
1087	Enqueues a kernel execution.	1257	Enqueues a kernel execution.
1088		1258
1089	@$global_work_size must be specified as a reference to an array of	1259	\@global_work_size must be specified as a reference to an array of
1090	integers specifying the work sizes (element counts).	1260	integers specifying the work sizes (element counts).
1091		1261
1092	@$global_work_offset must be either C<undef> (in which case all offsets	1262	\@global_work_offset must be either C<undef> (in which case all offsets
1093	are C<0>), or a reference to an array of work offsets, with the same number	1263	are C<0>), or a reference to an array of work offsets, with the same number
1094	of elements as @$global_work_size.	1264	of elements as \@global_work_size.
1095		1265
1096	@$local_work_size must be either C<undef> (in which case the	1266	\@local_work_size must be either C<undef> (in which case the
1097	implementation is supposed to choose good local work sizes), or a	1267	implementation is supposed to choose good local work sizes), or a
1098	reference to an array of local work sizes, with the same number of	1268	reference to an array of local work sizes, with the same number of
1099	elements as @$global_work_size.	1269	elements as \@global_work_size.
1100		1270
1101	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueNDRangeKernel.html>	1271	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueNDRangeKernel.html>
1102		1272
1103	=item $ev = $queue->enqueue_acquire_gl_objects ([object, ...], $wait_events...)	1273	=item $ev = $queue->acquire_gl_objects ([object, ...], $wait_events...)
1104		1274
1105	Enqueues a list (an array-ref of OpenCL::Memory objects) to be acquired	1275	Enqueues a list (an array-ref of OpenCL::Memory objects) to be acquired
1106	for subsequent OpenCL usage.	1276	for subsequent OpenCL usage.
1107		1277
1108	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueAcquireGLObjects.html>	1278	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueAcquireGLObjects.html>
1109		1279
1110	=item $ev = $queue->enqueue_release_gl_objects ([object, ...], $wait_events...)	1280	=item $ev = $queue->release_gl_objects ([object, ...], $wait_events...)
1111		1281
1112	Enqueues a list (an array-ref of OpenCL::Memory objects) to be released	1282	Enqueues a list (an array-ref of OpenCL::Memory objects) to be released
1113	for subsequent OpenGL usage.	1283	for subsequent OpenGL usage.
1114		1284
1115	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReleaseGLObjects.html>	1285	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReleaseGLObjects.html>
1116		1286
1117	=item $ev = $queue->enqueue_wait_for_events ($wait_events...)	1287	=item $ev = $queue->wait_for_events ($wait_events...)
1118		1288
1119	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWaitForEvents.html>	1289	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWaitForEvents.html>
1120		1290
1121	=item $ev = $queue->enqueue_marker ($wait_events...)	1291	=item $ev = $queue->marker ($wait_events...)
1122		1292
1123	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMarkerWithWaitList.html>	1293	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMarkerWithWaitList.html>
1124		1294
1125	=item $ev = $queue->enqueue_barrier ($wait_events...)	1295	=item $ev = $queue->barrier ($wait_events...)
1126		1296
1127	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueBarrierWithWaitList.html>	1297	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueBarrierWithWaitList.html>
1128		1298
1129	=item $queue->flush	1299	=item $queue->flush
1130		1300
…		…
1253	OpenCL::Image1DArray, OpenCL::Image1DBuffer, OpenCL::Image2D,	1423	OpenCL::Image1DArray, OpenCL::Image1DBuffer, OpenCL::Image2D,
1254	OpenCL::Image2DArray and OpenCL::Image3D.	1424	OpenCL::Image2DArray and OpenCL::Image3D.
1255		1425
1256	=over 4	1426	=over 4
1257		1427
1258	=item $packed_value = $ev->image_info ($name)	1428	=item $packed_value = $image->image_info ($name)
1259		1429
1260	See C<< $platform->info >> for details.	1430	See C<< $platform->info >> for details.
1261		1431
1262	The reason this method is not called C<info> is that there already is an	1432	The reason this method is not called C<info> is that there already is an
1263	C<< ->info >> method inherited from C<OpenCL::Memory>.	1433	C<< ->info >> method inherited from C<OpenCL::Memory>.
1264		1434
1265	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetImageInfo.html>	1435	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetImageInfo.html>
1266		1436
		1437	=item ($channel_order, $channel_data_type) = $image->format
		1438
		1439	Returns the channel order and type used to create the image by calling
		1440	C<clGetImageInfo> with C<CL_IMAGE_FORMAT>.
		1441
1267	=for gengetinfo begin image	1442	=for gengetinfo begin image
1268		1443
1269	=item $int = $image->element_size	1444	=item $int = $image->element_size
1270		1445
1271	Calls C<clGetImageInfo> with C<CL_IMAGE_ELEMENT_SIZE> and returns the result.	1446	Calls C<clGetImageInfo> with C<CL_IMAGE_ELEMENT_SIZE> and returns the result.
…		…
1344		1519
1345	=head2 THE OpenCL::Program CLASS	1520	=head2 THE OpenCL::Program CLASS
1346		1521
1347	=over 4	1522	=over 4
1348		1523
1349	=item $program->build ($device, $options = "")	1524	=item $program->build (\@devices = undef, $options = "", $cb->($program) = undef)
1350		1525
1351	Tries to build the program with the given options. See also the	1526	Tries to build the program with the given options. See also the
1352	C<$ctx->build> convenience function.	1527	C<$ctx->build> convenience function.
1353		1528
		1529	If a callback is specified, then it will be called when compilation is
		1530	finished. Note that many OpenCL implementations block your program while
		1531	compiling whether you use a callback or not. See C<build_async> if you
		1532	want to make sure the build is done in the background.
		1533
		1534	Note that some OpenCL implementations act up badly, and don't call the
		1535	callback in some error cases (but call it in others). This implementation
		1536	assumes the callback will always be called, and leaks memory if this is
		1537	not so. So best make sure you don't pass in invalid values.
		1538
		1539	Some implementations fail with C<OpenCL::INVALID_BINARY> when the
		1540	compilation state is successful but some later stage fails.
		1541
1354	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clBuildProgram.html>	1542	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clBuildProgram.html>
		1543
		1544	=item $program->build_async (\@devices = undef, $options = "", $cb->($program) = undef)
		1545
		1546	Similar to C<< ->build >>, except it starts a thread, and never fails (you
		1547	need to check the compilation status form the callback, or by polling).
1355		1548
1356	=item $packed_value = $program->build_info ($device, $name)	1549	=item $packed_value = $program->build_info ($device, $name)
1357		1550
1358	Similar to C<< $platform->info >>, but returns build info for a previous	1551	Similar to C<< $platform->info >>, but returns build info for a previous
1359	build attempt for the given device.	1552	build attempt for the given device.
…		…
1501		1694
1502	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_PRIVATE_MEM_SIZE> and returns the result.	1695	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_PRIVATE_MEM_SIZE> and returns the result.
1503		1696
1504	=for gengetinfo end kernel_work_group	1697	=for gengetinfo end kernel_work_group
1505		1698
		1699	=item $kernel->setf ($format, ...)
		1700
		1701	Sets the arguments of a kernel. Since OpenCL 1.1 doesn't have a generic
		1702	way to set arguments (and with OpenCL 1.2 it might be rather slow), you
		1703	need to specify a format argument, much as with C<printf>, to tell OpenCL
		1704	what type of argument it is.
		1705
		1706	The format arguments are single letters:
		1707
		1708	c char
		1709	C unsigned char
		1710	s short
		1711	S unsigned short
		1712	i int
		1713	I unsigned int
		1714	l long
		1715	L unsigned long
		1716
		1717	h half float (0..65535)
		1718	f float
		1719	d double
		1720
		1721	z local (octet size)
		1722
		1723	m memory object (buffer or image)
		1724	a sampler
		1725	e event
		1726
		1727	Space characters in the format string are ignored.
		1728
		1729	Example: set the arguments for a kernel that expects an int, two floats, a buffer and an image.
		1730
		1731	$kernel->setf ("i ff mm", 5, 0.5, 3, $buffer, $image);
		1732
1506	=item $kernel->set_TYPE ($index, $value)	1733	=item $kernel->set_TYPE ($index, $value)
1507		1734
		1735	=item $kernel->set_char ($index, $value)
		1736
		1737	=item $kernel->set_uchar ($index, $value)
		1738
		1739	=item $kernel->set_short ($index, $value)
		1740
		1741	=item $kernel->set_ushort ($index, $value)
		1742
		1743	=item $kernel->set_int ($index, $value)
		1744
		1745	=item $kernel->set_uint ($index, $value)
		1746
		1747	=item $kernel->set_long ($index, $value)
		1748
		1749	=item $kernel->set_ulong ($index, $value)
		1750
		1751	=item $kernel->set_half ($index, $value)
		1752
		1753	=item $kernel->set_float ($index, $value)
		1754
		1755	=item $kernel->set_double ($index, $value)
		1756
		1757	=item $kernel->set_memory ($index, $value)
		1758
		1759	=item $kernel->set_buffer ($index, $value)
		1760
		1761	=item $kernel->set_image ($index, $value)
		1762
		1763	=item $kernel->set_sampler ($index, $value)
		1764
		1765	=item $kernel->set_local ($index, $value)
		1766
		1767	=item $kernel->set_event ($index, $value)
		1768
1508	This is a family of methods to set the kernel argument with the number C<$index> to the give C<$value>.	1769	This is a family of methods to set the kernel argument with the number
1509		1770	C<$index> to the give C<$value>.
1510	TYPE is one of C<char>, C<uchar>, C<short>, C<ushort>, C<int>, C<uint>,
1511	C<long>, C<ulong>, C<half>, C<float>, C<double>, C<memory>, C<buffer>,
1512	C<image2d>, C<image3d>, C<sampler>, C<local> or C<event>.
1513		1771
1514	Chars and integers (including the half type) are specified as integers,	1772	Chars and integers (including the half type) are specified as integers,
1515	float and double as floating point values, memory/buffer/image2d/image3d	1773	float and double as floating point values, memory/buffer/image must be
1516	must be an object of that type or C<undef>, local-memory arguments are	1774	an object of that type or C<undef>, local-memory arguments are set by
1517	set by specifying the size, and sampler and event must be objects of that	1775	specifying the size, and sampler and event must be objects of that type.
1518	type.	1776
		1777	Note that C<set_memory> works for all memory objects (all types of buffers
		1778	and images) - the main purpose of the more specific C<set_TYPE> functions
		1779	is type checking.
1519		1780
1520	Setting an argument for a kernel does NOT keep a reference to the object -	1781	Setting an argument for a kernel does NOT keep a reference to the object -
1521	for example, if you set an argument to some image object, free the image,	1782	for example, if you set an argument to some image object, free the image,
1522	and call the kernel, you will run into undefined behaviour.	1783	and call the kernel, you will run into undefined behaviour.
1523		1784
…		…
1536		1797
1537	Waits for the event to complete.	1798	Waits for the event to complete.
1538		1799
1539	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>	1800	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
1540		1801
		1802	=item $ev->cb ($exec_callback_type, $callback->($event, $event_command_exec_status))
		1803
		1804	Adds a callback to the callback stack for the given event type. There is
		1805	no way to remove a callback again.
		1806
		1807	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetEventCallback.html>
		1808
1541	=item $packed_value = $ev->info ($name)	1809	=item $packed_value = $ev->info ($name)
1542		1810
1543	See C<< $platform->info >> for details.	1811	See C<< $platform->info >> for details.
1544		1812
1545	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>	1813	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>
…		…
1605		1873
1606	=over 4	1874	=over 4
1607		1875
1608	=item $ev->set_status ($execution_status)	1876	=item $ev->set_status ($execution_status)
1609		1877
		1878	Sets the execution status of the user event. Can only be called once,
		1879	either with OpenCL::COMPLETE or a negative number as status.
		1880
1610	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>	1881	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>
1611		1882
1612	=back	1883	=back
1613		1884
1614	=cut	1885	=cut

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Comparing OpenCL/OpenCL.pm (file contents): Revision 1.52 by root, Tue Apr 24 14:24:42 2012 UTC vs. Revision 1.63 by root, Sun Apr 29 18:24:35 2012 UTC

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Comparing OpenCL/OpenCL.pm (file contents):
Revision 1.52 by root, Tue Apr 24 14:24:42 2012 UTC vs.
Revision 1.63 by root, Sun Apr 29 18:24:35 2012 UTC