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better nlines calc

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better cache sizing for some image widths
This commit is contained in:
John Cupitt 2017-04-13 22:38:32 +01:00
parent 126fdd4f6f
commit c79f64ab7d
1 changed files with 1 additions and 2 deletions
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3
libvips/iofuncs/threadpool.c
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@ -1058,8 +1058,7 @@ vips_get_tile_size( VipsImage *im,
* to a multiple of tileheight.
*/
*n_lines = vips__tile_height *
VIPS_MAX( 1,
nthr / VIPS_MAX( 1, im->Xsize / vips__tile_width ) );
VIPS_ROUND_UP( vips__tile_width * nthr, im->Xsize ) / im->Xsize;
*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 );