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revise cache sizing

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we had output buffers too large, input caches too small

see https://github.com/jcupitt/libvips/issues/639
This commit is contained in:
John Cupitt 2017-04-13 16:24:51 +01:00
parent 38b65478e5
commit e01a90f7cf
4 changed files with 17 additions and 7 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
7/4/17 started 8.5.3
- more link fixing in docs
- revise cache sizing again to help out of order errors under heavy load, thanks
kleisauke
25/3/17 started 8.5.2
- better behaviour for truncated PNG files, thanks Yury

2
TODO
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@ -1,5 +1,3 @@
- add analytics tags to docs output
- not sure about utf8 error messages on win
- strange:

7
libvips/conversion/tilecache.c
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@ -935,7 +935,12 @@ vips_line_cache_build( VipsObject *object )
vips_get_tile_size( block_cache->in,
&tile_width, &tile_height, &n_lines );
block_cache->tile_width = block_cache->in->Xsize;
block_cache->max_tiles = 1 + 2 * n_lines / block_cache->tile_height;
/* Output has two buffers n_lines height, so 2 * n_lines is the maximum
* non-locality from threading. Add another n_lines for conv / reducev
* etc.
*/
block_cache->max_tiles = 3 * n_lines / block_cache->tile_height;
VIPS_DEBUG_MSG( "vips_line_cache_build: n_lines = %d\n",
n_lines );

13
libvips/iofuncs/threadpool.c
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@ -48,9 +48,9 @@
*/
/*
#define VIPS_DEBUG
#define VIPS_DEBUG_RED
#define DEBUG_OUT_OF_THREADS
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
@ -1011,6 +1011,10 @@ vips__threadpool_init( void )
* Pick a tile size and a buffer height for this image and the current
* value of vips_concurrency_get(). The buffer height
* will always be a multiple of tile_height.
*
* The buffer height is the height of each buffer we fill in sink disc. Since
* we have two buffers, the largest range of input locality is twice the output
* buffer size, plus whatever margin we add for things like convolution.
*/
void
vips_get_tile_size( VipsImage *im,
@ -1054,9 +1058,10 @@ vips_get_tile_size( VipsImage *im,
* to a multiple of tileheight.
*/
*n_lines = vips__tile_height *
(1 + nthr / VIPS_MAX( 1, im->Xsize / vips__tile_width )) * 2;
*n_lines = VIPS_MAX( *n_lines, vips__fatstrip_height * nthr * 2 );
*n_lines = VIPS_MAX( *n_lines, vips__thinstrip_height * nthr * 2 );
VIPS_MAX( 1,
nthr / VIPS_MAX( 1, im->Xsize / vips__tile_width ) );
*n_lines = VIPS_MAX( *n_lines, vips__fatstrip_height * nthr );
*n_lines = VIPS_MAX( *n_lines, vips__thinstrip_height * nthr );
*n_lines = VIPS_ROUND_UP( *n_lines, *tile_height );
/* We make this assumption in several places.