clean up after fix
threaded tile cache seems a good solution --- clean up and get ready to merge back into master
This commit is contained in:
John Cupitt
parent
8ab2f3eeb6
commit
a431f5e021
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@ -1,11 +1,8 @@
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31/12/12 started 7.30.7
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- better option parsing for "vips", thanks Haida
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- small fixes to help OS X
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- removed sequential skip-ahead, it was not reliable on machines under
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heavy load
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- backported threaded tile cache from next version, im_tile_cache() now uses
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it to prevent a deadlock
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- backported threaded tile cache from next version, im_tile_cache() now
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uses it to prevent a deadlock, see comment there
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14/11/12 started 7.30.6
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- capture tiff warnings earlier
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63
TODO
63
TODO
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@ -1,66 +1,3 @@
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- carrierwave-vips is doing
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im_png2vips
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vips_sequential
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vips_linecache
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vips_blockcache(), but upsizes
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vips_sequential_generate() to delay ahead threads
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im_shrink
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im_tile_cache (old single-threaded vips7 tile cache)
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im_affine
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im_conv
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im_vips2png
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the im_tile_cache() single-threads, so one threads get out of order there,
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no amount of delay in vips_sequential_generate() is going to fix it ...
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we've deadlocked
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vipsthumbnail does exactly the same thing
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the comment there says that im_tile_cache() is necessary, since the conv
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will force SMALLTILE, and that will break sequentiality
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turning the im_tile_cache() into an im_copy() fixes the deadlock, but might
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break for large shrink factors
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yes, try eg. $ vipsthumbnail Chicago.png --verbose --size 20
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fails with a shrink of 1462
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there seems to be a good speed improvement from deleting the tile cache
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ruby-vips, jpeg image: 55ms
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ruby-vips, png image: 1853ms
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compared to
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ruby-vips, jpeg image: 50ms
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ruby-vips, png image: 2401ms
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from the README ... benchmark again after tests
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how about using the threaded tile cache from master? would that fix it?
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seems to!
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remove the old im_tile_cache() code
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benchmark again
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check the way we disabled extract/insert skipahead
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check vips_sequential skipahead code
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add a comment to the im_tile_cache() wrapper explaining why it turns
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on threading
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when we port forward again, we'll need to re-add the vips_ prefix to
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g_mutex_new() in tilecache.c
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blocking bugs
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=============
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@ -181,6 +181,7 @@ vips_extract_area_class_init( VipsExtractAreaClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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VIPS_DEBUG_MSG( "vips_extract_area_class_init\n" );
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@ -191,6 +192,8 @@ vips_extract_area_class_init( VipsExtractAreaClass *class )
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vobject_class->description = _( "extract an area from an image" );
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vobject_class->build = vips_extract_area_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_IMAGE( class, "input", 0,
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_( "Input" ),
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_( "Input image" ),
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@ -342,6 +342,7 @@ vips_insert_class_init( VipsInsertClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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VIPS_DEBUG_MSG( "vips_insert_class_init\n" );
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@ -352,6 +353,8 @@ vips_insert_class_init( VipsInsertClass *class )
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vobject_class->description = _( "insert an image" );
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vobject_class->build = vips_insert_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_IMAGE( class, "main", -1,
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_( "Main" ),
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_( "Main input image" ),
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@ -66,9 +66,9 @@
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/* Stall threads that run ahead for this long, in seconds.
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*
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* This has to be a long time: if we're trying to use all cores on a busy
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* system it could be ages until all the other threads get a chance to run.
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* system, it could be ages until all the other threads get a chance to run.
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*/
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#define STALL_TIME (10000.0)
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#define STALL_TIME (1.0)
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typedef struct _VipsSequential {
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VipsConversion parent_instance;
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@ -136,12 +136,20 @@ vips_sequential_generate( VipsRegion *or,
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return( -1 );
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}
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if( r->top > sequential->y_pos ) {
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if( r->top > sequential->y_pos &&
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sequential->y_pos > 0 ) {
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/* We have started reading (y_pos > 0) and this request is for
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* stuff beyond that, stall for a while to give other
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* threads time to catch up.
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*
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* The stall can be cancelled by a signal on @ready.
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*
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* We don't stall forever, since an error would be better than
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* deadlock, and we don't fail on timeout, since the timeout
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* may be harmless.
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*/
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GTimeVal time;
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/* This read is ahead of the current read point.
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* Stall for a while to give other threads time to catch up.
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*/
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VIPS_DEBUG_MSG( "thread %p stalling for up to %gs ...\n",
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STALL_TIME, g_thread_self() );
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g_get_current_time( &time );
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@ -159,15 +167,14 @@ vips_sequential_generate( VipsRegion *or,
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g_thread_self() );
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}
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/* This is a request for something some way down the image, and we've
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* either not read anything yet or fallen through from the stall
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* above.
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*
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* Probably the operation is something like
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* extract_area and we should skip the initial part of the image. In
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* fact we read to cache.
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*/
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if( r->top > sequential->y_pos ) {
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/* This is a request for something some way down the image,
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* and we've fallen through from the stall above.
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*
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* Probably the operation is something like extract_area and
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* we should skip the initial part of the image. In fact,
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* we read to cache, since it may be useful.
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*/
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VipsRect area;
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VIPS_DEBUG_MSG( "thread %p skipping to line %d ...\n",
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@ -56,7 +56,6 @@ libdeprecated_la_SOURCES = \
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im_png2vips.c \
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im_ppm2vips.c \
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im_tiff2vips.c \
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im_tile_cache.c \
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im_vips2csv.c \
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im_vips2jpeg.c \
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im_vips2png.c \
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@ -1,434 +0,0 @@
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/* Tile tile cache from tiff2vips ... broken out so it can be shared with
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* openexr read.
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*
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* This isn't the same as im_cache(): we don't sub-divide, and we
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* single-thread our callee.
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*
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* 23/8/06
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* - take ownership of reused tiles in case the cache is being shared
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* 13/2/07
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* - release ownership after fillng with pixels in case we read across
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* threads
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* 4/2/10
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* - gtkdoc
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* 12/12/10
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* - use im_prepare_to() and avoid making a sequence for every cache tile
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/* Turn on debugging output.
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#define DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <vips/vips.h>
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#include <vips/thread.h>
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/* A tile in our cache.
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*/
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typedef struct {
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struct _Read *read;
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REGION *region; /* REGION with private mem for data */
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int time; /* Time of last use for flush */
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int x; /* xy pos in VIPS image cods */
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int y;
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} Tile;
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/* Stuff we track during a read.
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*/
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typedef struct _Read {
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/* Parameters.
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*/
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IMAGE *in;
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IMAGE *out;
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int tile_width;
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int tile_height;
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int max_tiles;
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/* Cache.
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*/
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int time; /* Update ticks for LRU here */
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int ntiles; /* Current cache size */
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GMutex *lock; /* Lock everything here */
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GSList *cache; /* List of tiles */
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} Read;
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static void
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tile_destroy( Tile *tile )
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{
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Read *read = tile->read;
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read->cache = g_slist_remove( read->cache, tile );
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read->ntiles -= 1;
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g_assert( read->ntiles >= 0 );
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tile->read = NULL;
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IM_FREEF( im_region_free, tile->region );
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im_free( tile );
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}
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static void
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read_destroy( Read *read )
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{
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IM_FREEF( g_mutex_free, read->lock );
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while( read->cache ) {
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Tile *tile = (Tile *) read->cache->data;
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tile_destroy( tile );
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}
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im_free( read );
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}
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static Read *
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read_new( IMAGE *in, IMAGE *out,
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int tile_width, int tile_height, int max_tiles )
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{
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Read *read;
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if( !(read = IM_NEW( NULL, Read )) )
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return( NULL );
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read->in = in;
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read->out = out;
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read->tile_width = tile_width;
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read->tile_height = tile_height;
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read->max_tiles = max_tiles;
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read->time = 0;
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read->ntiles = 0;
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read->lock = g_mutex_new();
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||||
read->cache = NULL;
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||||
|
||||
if( im_add_close_callback( out,
|
||||
(im_callback_fn) read_destroy, read, NULL ) ) {
|
||||
read_destroy( read );
|
||||
return( NULL );
|
||||
}
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||||
|
||||
return( read );
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||||
}
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||||
|
||||
static Tile *
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||||
tile_new( Read *read )
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||||
{
|
||||
Tile *tile;
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||||
|
||||
if( !(tile = IM_NEW( NULL, Tile )) )
|
||||
return( NULL );
|
||||
|
||||
tile->read = read;
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||||
tile->region = NULL;
|
||||
tile->time = read->time;
|
||||
tile->x = -1;
|
||||
tile->y = -1;
|
||||
read->cache = g_slist_prepend( read->cache, tile );
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||||
g_assert( read->ntiles >= 0 );
|
||||
read->ntiles += 1;
|
||||
|
||||
if( !(tile->region = im_region_create( read->in )) ) {
|
||||
tile_destroy( tile );
|
||||
return( NULL );
|
||||
}
|
||||
im__region_no_ownership( tile->region );
|
||||
|
||||
return( tile );
|
||||
}
|
||||
|
||||
static int
|
||||
tile_move( Tile *tile, int x, int y )
|
||||
{
|
||||
Rect area;
|
||||
|
||||
tile->x = x;
|
||||
tile->y = y;
|
||||
|
||||
area.left = x;
|
||||
area.top = y;
|
||||
area.width = tile->read->tile_width;
|
||||
area.height = tile->read->tile_height;
|
||||
|
||||
if( im_region_buffer( tile->region, &area ) )
|
||||
return( -1 );
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/* Do we have a tile in the cache?
|
||||
*/
|
||||
static Tile *
|
||||
tile_search( Read *read, int x, int y )
|
||||
{
|
||||
GSList *p;
|
||||
|
||||
for( p = read->cache; p; p = p->next ) {
|
||||
Tile *tile = (Tile *) p->data;
|
||||
|
||||
if( tile->x == x && tile->y == y )
|
||||
return( tile );
|
||||
}
|
||||
|
||||
return( NULL );
|
||||
}
|
||||
|
||||
static void
|
||||
tile_touch( Tile *tile )
|
||||
{
|
||||
g_assert( tile->read->ntiles >= 0 );
|
||||
|
||||
tile->time = tile->read->time++;
|
||||
}
|
||||
|
||||
/* Fill a tile with pixels.
|
||||
*/
|
||||
static int
|
||||
tile_fill( Tile *tile, REGION *in )
|
||||
{
|
||||
Rect area;
|
||||
|
||||
#ifdef DEBUG
|
||||
printf( "im_tile_cache: filling tile %d x %d\n", tile->x, tile->y );
|
||||
#endif /*DEBUG*/
|
||||
|
||||
area.left = tile->x;
|
||||
area.top = tile->y;
|
||||
area.width = tile->read->tile_width;
|
||||
area.height = tile->read->tile_height;
|
||||
|
||||
if( im_prepare_to( in, tile->region, &area, area.left, area.top ) )
|
||||
return( -1 );
|
||||
|
||||
tile_touch( tile );
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/* Find existing tile, make a new tile, or if we have a full set of tiles,
|
||||
* reuse LRU.
|
||||
*/
|
||||
static Tile *
|
||||
tile_find( Read *read, REGION *in, int x, int y )
|
||||
{
|
||||
Tile *tile;
|
||||
int oldest;
|
||||
GSList *p;
|
||||
|
||||
/* In cache already?
|
||||
*/
|
||||
if( (tile = tile_search( read, x, y )) ) {
|
||||
tile_touch( tile );
|
||||
|
||||
return( tile );
|
||||
}
|
||||
|
||||
/* Cache not full?
|
||||
*/
|
||||
if( read->max_tiles == -1 ||
|
||||
read->ntiles < read->max_tiles ) {
|
||||
if( !(tile = tile_new( read )) ||
|
||||
tile_move( tile, x, y ) ||
|
||||
tile_fill( tile, in ) )
|
||||
return( NULL );
|
||||
|
||||
return( tile );
|
||||
}
|
||||
|
||||
/* Reuse an old one.
|
||||
*/
|
||||
oldest = read->time;
|
||||
tile = NULL;
|
||||
for( p = read->cache; p; p = p->next ) {
|
||||
Tile *t = (Tile *) p->data;
|
||||
|
||||
if( t->time < oldest ) {
|
||||
oldest = t->time;
|
||||
tile = t;
|
||||
}
|
||||
}
|
||||
|
||||
g_assert( tile );
|
||||
|
||||
#ifdef DEBUG
|
||||
printf( "im_tile_cache: reusing tile %d x %d\n", tile->x, tile->y );
|
||||
#endif /*DEBUG*/
|
||||
|
||||
if( tile_move( tile, x, y ) ||
|
||||
tile_fill( tile, in ) )
|
||||
return( NULL );
|
||||
|
||||
return( tile );
|
||||
}
|
||||
|
||||
/* Copy rect from from to to.
|
||||
*/
|
||||
static void
|
||||
copy_region( REGION *from, REGION *to, Rect *area )
|
||||
{
|
||||
int y;
|
||||
|
||||
/* Area should be inside both from and to.
|
||||
*/
|
||||
g_assert( im_rect_includesrect( &from->valid, area ) );
|
||||
g_assert( im_rect_includesrect( &to->valid, area ) );
|
||||
|
||||
/* Loop down common area, copying.
|
||||
*/
|
||||
for( y = area->top; y < IM_RECT_BOTTOM( area ); y++ ) {
|
||||
PEL *p = (PEL *) IM_REGION_ADDR( from, area->left, y );
|
||||
PEL *q = (PEL *) IM_REGION_ADDR( to, area->left, y );
|
||||
|
||||
memcpy( q, p, IM_IMAGE_SIZEOF_PEL( from->im ) * area->width );
|
||||
}
|
||||
}
|
||||
|
||||
/* Loop over the output region, filling with data from cache.
|
||||
*/
|
||||
static int
|
||||
tile_cache_fill( REGION *out, void *seq, void *a, void *b )
|
||||
{
|
||||
REGION *in = (REGION *) seq;
|
||||
Read *read = (Read *) b;
|
||||
const int tw = read->tile_width;
|
||||
const int th = read->tile_height;
|
||||
Rect *r = &out->valid;
|
||||
|
||||
/* Find top left of tiles we need.
|
||||
*/
|
||||
int xs = (r->left / tw) * tw;
|
||||
int ys = (r->top / th) * th;
|
||||
|
||||
int x, y;
|
||||
|
||||
g_mutex_lock( read->lock );
|
||||
|
||||
for( y = ys; y < IM_RECT_BOTTOM( r ); y += th )
|
||||
for( x = xs; x < IM_RECT_RIGHT( r ); x += tw ) {
|
||||
Tile *tile;
|
||||
Rect tarea;
|
||||
Rect hit;
|
||||
|
||||
if( !(tile = tile_find( read, in, x, y )) ) {
|
||||
g_mutex_unlock( read->lock );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
/* The area of the tile.
|
||||
*/
|
||||
tarea.left = x;
|
||||
tarea.top = y;
|
||||
tarea.width = tw;
|
||||
tarea.height = th;
|
||||
|
||||
/* The part of the tile that we need.
|
||||
*/
|
||||
im_rect_intersectrect( &tarea, r, &hit );
|
||||
|
||||
copy_region( tile->region, out, &hit );
|
||||
}
|
||||
|
||||
g_mutex_unlock( read->lock );
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/**
|
||||
* im_tile_cache:
|
||||
* @in: input image
|
||||
* @out: output image
|
||||
* @tile_width: tile width
|
||||
* @tile_height: tile height
|
||||
* @max_tiles: maximum number of tiles to cache
|
||||
*
|
||||
* This operation behaves rather like im_copy() between images
|
||||
* @in and @out, except that it keeps a cache of computed pixels.
|
||||
* This cache is made of up to @max_tiles tiles (a value of -1 for
|
||||
* means any number of tiles), and each tile is of size @tile_width
|
||||
* by @tile_height pixels. Each cache tile is made with a single call to
|
||||
* im_prepare().
|
||||
*
|
||||
* This is a lower-level operation than im_cache() since it does no
|
||||
* subdivision. It is suitable for caching the output of operations like
|
||||
* im_exr2vips() on tiled images.
|
||||
*
|
||||
* See also: im_cache().
|
||||
*
|
||||
* Returns: 0 on success, -1 on error.
|
||||
*/
|
||||
int
|
||||
im_tile_cache( IMAGE *in, IMAGE *out,
|
||||
int tile_width, int tile_height, int max_tiles )
|
||||
{
|
||||
VipsImage *x;
|
||||
|
||||
if( vips_tilecache( in, &x,
|
||||
"tile_width", tile_width,
|
||||
"tile_height", tile_height,
|
||||
"max_tiles", max_tiles,
|
||||
"strategy", VIPS_CACHE_SEQUENTIAL,
|
||||
"threaded", TRUE,
|
||||
NULL ) )
|
||||
return( -1 );
|
||||
if( im_copy( x, out ) ) {
|
||||
g_object_unref( x );
|
||||
return( -1 );
|
||||
}
|
||||
g_object_unref( x );
|
||||
|
||||
return( 0 );
|
||||
|
||||
/*
|
||||
Read *read;
|
||||
|
||||
if( tile_width <= 0 || tile_height <= 0 || max_tiles < -1 ) {
|
||||
im_error( "im_tile_cache", "%s", _( "bad parameters" ) );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
if( im_piocheck( in, out ) ||
|
||||
im_cp_desc( out, in ) ||
|
||||
im_demand_hint( out, IM_ANY, in, NULL ) ||
|
||||
!(read = read_new( in, out,
|
||||
tile_width, tile_height, max_tiles )) ||
|
||||
im_generate( out,
|
||||
im_start_one, tile_cache_fill, im_stop_one, in, read ) )
|
||||
return( -1 );
|
||||
|
||||
return( 0 );
|
||||
*/
|
||||
|
||||
return( im_copy( in, out ) );
|
||||
}
|
||||
|
|
@ -2143,3 +2143,42 @@ im_rightshift_size( IMAGE *in, IMAGE *out,
|
|||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/* This is used by vipsthumbnail and the carrierwave shrinker to cache the
|
||||
* output of shrink before doing the final affine.
|
||||
*
|
||||
* We use the vips8 threaded tilecache to avoid a deadlock: suppose thread1,
|
||||
* evaluating the top block of the output is delayed, and thread2, evaluating
|
||||
* the second block gets here first (this can happen on a heavily-loaded
|
||||
* system).
|
||||
*
|
||||
* With an unthreaded tilecache (as we had before), thread2 will get
|
||||
* the cache lock and start evaling the second block of the shrink. When it
|
||||
* reaches the png reader it will stall untilthe first block has been used ...
|
||||
* but it never will, since thread1 will block on this cache lock.
|
||||
*
|
||||
* This function is only used in those two places (I think), so it's OK to
|
||||
* hard-wire this to be a sequential threaded cache.
|
||||
*/
|
||||
int
|
||||
im_tile_cache( IMAGE *in, IMAGE *out,
|
||||
int tile_width, int tile_height, int max_tiles )
|
||||
{
|
||||
VipsImage *x;
|
||||
|
||||
if( vips_tilecache( in, &x,
|
||||
"tile_width", tile_width,
|
||||
"tile_height", tile_height,
|
||||
"max_tiles", max_tiles,
|
||||
"strategy", VIPS_CACHE_SEQUENTIAL,
|
||||
"threaded", TRUE,
|
||||
NULL ) )
|
||||
return( -1 );
|
||||
if( im_copy( x, out ) ) {
|
||||
g_object_unref( x );
|
||||
return( -1 );
|
||||
}
|
||||
g_object_unref( x );
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue