argh

ChangeLog

@@ -1,5 +1,8 @@
 31/12/12 started 7.30.7
 - better option parsing for "vips", thanks Haida
+- small fixes to help OS X
+- removed sequential skip-ahead, it was not reliable on machines under 
+  heavy load
 
 14/11/12 started 7.30.6
 - capture tiff warnings earlier

TODO

@@ -1,3 +1,41 @@
+- carrierwave-vips is doing
+
+	im_png2vips
+		vips_sequential	
+			vips_linecache
+				vips_blockcache(), but upsizes
+			vips_sequential_generate() to delay ahead threads
+	im_shrink
+	im_tile_cache (old single-threaded vips7 tile cache)
+	im_affine
+	im_conv
+	im_vips2png
+
+  the im_tile_cache() single-threads, so one threads get out of order there,
+  no amount of delay in vips_sequential_generate() is going to fix it ...
+  we've deadlocked
+
+  vipsthumbnail does exactly the same thing
+
+  the comment there says that im_tile_cache() is necessary, since the conv
+  will force SMALLTILE, and that will break sequentiality
+
+  turning the im_tile_cache() into an im_copy() fixes the deadlock, but might
+  break for large shrink factors
+
+  try with im_tile_cache() disabled with vipsthumbnail and huge shrinks
+
+  perhaps swap the im_tile_cache() for another vips_sequential()? could we
+  then remove the one from png2vips?
+
+
+
+
+
+
+
+
+
 blocking bugs
 =============
 

libvips/conversion/extract.c

@@ -181,7 +181,6 @@ vips_extract_area_class_init( VipsExtractAreaClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
-	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_extract_area_class_init\n" );
 
@@ -192,8 +191,6 @@ vips_extract_area_class_init( VipsExtractAreaClass *class )
 	vobject_class->description = _( "extract an area from an image" );
 	vobject_class->build = vips_extract_area_build;
 
-	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
-
 	VIPS_ARG_IMAGE( class, "input", 0, 
 		_( "Input" ), 
 		_( "Input image" ),

libvips/conversion/insert.c

@@ -342,7 +342,6 @@ vips_insert_class_init( VipsInsertClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
-	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_insert_class_init\n" );
 
@@ -353,8 +352,6 @@ vips_insert_class_init( VipsInsertClass *class )
 	vobject_class->description = _( "insert an image" );
 	vobject_class->build = vips_insert_build;
 
-	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
-
 	VIPS_ARG_IMAGE( class, "main", -1, 
 		_( "Main" ), 
 		_( "Main input image" ),

libvips/conversion/sequential.c

@@ -45,8 +45,8 @@
  */
 
 /*
- */
 #define VIPS_DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -64,8 +64,11 @@
 #include "conversion.h"
 
 /* Stall threads that run ahead for this long, in seconds.
+ *
+ * This has to be a long time: if we're trying to use all cores on a busy 
+ * system it could be ages until all the other threads get a chance to run. 
  */
-#define STALL_TIME (1.0)
+#define STALL_TIME (10000.0)
 
 typedef struct _VipsSequential {
 	VipsConversion parent_instance;
@@ -133,14 +136,11 @@ vips_sequential_generate( VipsRegion *or,
 		return( -1 );
 	}
 
-	if( r->top > sequential->y_pos 
-			//&& sequential->y_pos > 0 
-			) {
+	if( r->top > sequential->y_pos ) {
 		GTimeVal time;
 
-		/* We have started reading (y_pos > 0) and this request is for 
-		 * stuff beyond that, stall for a short while to give other
-		 * threads time to catch up.
+		/* This read is ahead of the current read point. 
+		 * Stall for a while to give other threads time to catch up.
 		 */
 		VIPS_DEBUG_MSG( "thread %p stalling for up to %gs ...\n", 
 			STALL_TIME, g_thread_self() ); 

libvips/deprecated/im_tile_cache.c

@@ -392,6 +392,7 @@ int
 im_tile_cache( IMAGE *in, IMAGE *out,
 	int tile_width, int tile_height, int max_tiles )
 {
+	/*
 	Read *read;
 
 	if( tile_width <= 0 || tile_height <= 0 || max_tiles < -1 ) {
@@ -409,4 +410,7 @@ im_tile_cache( IMAGE *in, IMAGE *out,
 		return( -1 );
 
 	return( 0 );
+	 */
+
+	return( im_copy( in, out ) ); 
 }

libvips/foreign/vipspng.c

@@ -407,9 +407,9 @@ png2vips_generate( VipsRegion *or,
 	int y;
 
 #ifdef DEBUG
-#endif /*DEBUG*/
 	printf( "png2vips_generate: line %d, %d rows\n", 
 		r->top, r->height );
+#endif /*DEBUG*/
 
 	/* We're inside a tilecache where tiles are the full image width, so
 	 * this should always be true.

libvips/iofuncs/sinkdisc.c

@@ -387,8 +387,9 @@ wbuffer_allocate_fn( VipsThreadState *state, void *a, gboolean *stop )
 	 */
 	wstate->buf = write->buf;
 
-	VIPS_DEBUG_MSG( "  allocated "
+	VIPS_DEBUG_MSG( "  thread %p allocated "
 		"left = %d, top = %d, width = %d, height = %d\n", 
+		g_thread_self(), 
 		tile.left, tile.top, tile.width, tile.height );
 
 	/* Add to the number of writers on the buffer.
@@ -415,13 +416,15 @@ wbuffer_work_fn( VipsThreadState *state, void *a )
 
 	int result;
 
-	VIPS_DEBUG_MSG( "wbuffer_work_fn: %p %d x %d\n", 
-		state, state->pos.left, state->pos.top );
+	VIPS_DEBUG_MSG( "wbuffer_work_fn: thread %p, %d x %d\n", 
+		g_thread_self(), 
+		state->pos.left, state->pos.top );
 
 	result = vips_region_prepare_to( state->reg, wstate->buf->region, 
 		&state->pos, state->pos.left, state->pos.top );
 
-	VIPS_DEBUG_MSG( "wbuffer_work_fn: %p result = %d\n", state, result );
+	VIPS_DEBUG_MSG( "wbuffer_work_fn: thread %p result = %d\n", 
+		g_thread_self(), result );
 
 	/* Tell the bg write thread we've left.
 	 */

libvips/resample/shrink.c

@@ -63,8 +63,8 @@
  */
 
 /*
- */
 #define DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -347,6 +347,14 @@ vips_shrink_build( VipsObject *object )
 		return( -1 );
 	}
 
+#ifdef DEBUG
+	printf( "vips_shrink_build: shrinking %d x %d image to %d x %d\n", 
+		resample->in->Xsize, resample->in->Ysize, 
+		resample->out->Xsize, resample->out->Ysize );  
+	printf( "vips_shrink_build: %d x %d block average\n", 
+		shrink->mw, shrink->mh ); 
+#endif /*DEBUG*/
+
 	if( vips_image_generate( resample->out,
 		vips_shrink_start, vips_shrink_gen, vips_shrink_stop, 
 		resample->in, shrink ) )