@afre @Silvio_Grosso I have added both a tooltip for the relight button, and a close button to the soft-proofing dialog. It is true that this was already mentioned in the past, but went over my head. Thanks for the reminder!
The fixes are committed to the stable branch only.
@paulmiller @gadolf @afre I have introduced two changes, now that it is more or less clear that the issue is in the multi-threading part:
Once more, your feedback will be very much appreciated, because on my system I can scroll like hell and nothing bad happens!!!
The new MacOS package should be ready in a short whileā¦
You should make a scroll_like_hell branch just for kicks. It isnāt only about scrolling rapidly or scrolling lots but also leaving PF open for a long time.
Is that 1c461?
Its still crashing (but with a slightly different stack trace - there are a couple of extra vips_* calls in there):
Thread 19 Crashed:: worker
0 libsystem_kernel.dylib 0x00007fff5989e2c6 __pthread_kill + 10
1 libsystem_pthread.dylib 0x00007fff59959bf1 pthread_kill + 284
2 libsystem_c.dylib 0x00007fff598086a6 abort + 127
3 libglib-2.0.0.dylib 0x0000000108070688 g_assertion_message + 423
4 libglib-2.0.0.dylib 0x00000001080706e6 g_assertion_message_expr + 94
5 photoflow 0x0000000105aef8fc phf_tile_cache_gen + 2172
6 libvips.42.dylib 0x0000000107ca486d vips_region_prepare + 253
7 libvips.42.dylib 0x0000000107bd8639 vips_embed_base_gen + 121
8 libvips.42.dylib 0x0000000107ca486d vips_region_prepare + 253
9 photoflow 0x0000000105af6264 vips_layer_gen(_VipsRegion*, void*, void*, void*, int*) + 196
photoflow_log6.txt (13.9 KB)
This is fast, even at 1:1.
I had this crash after inserting a gradient layer early into the pixel pipe (I probably shouldnāt, but I did it)
debug2.txt (128.3 KB)
Just tried b9f2f:
It still crashes, but it took longer. I ran it with PHF_TILECACHE_DEBUG=1. The resulting log is 25MB!
photoflow_log7.txt.zip (1.5 MB)
@gadolf: there is nothing wrong with inserting a gradient layer anywhere in the layers stack, this should just work. However, the crash you observed does not seem to be related to tile caching, and would require running the program through gdb or valgrind in order to catch the exact place where crash occursā¦
@paulmiller: I am happy to see that the crash is still there when using the verbose logging. Looking at the referencing/dereferencing history of the tile that generates the crash, I see the following:
phf_tile_ref: tile: 0x10f3c7338 ref_count: 1
phf_tile_ref: tile: 0x10f3c7338 ref_count: 2
phf_tile_ref: tile: 0x10f3c7338 ref_count: 3
phf_tile_unref: tile: 0x10f3c7338 ref_count: 3
phf_tile_unref: tile: 0x10f3c7338 ref_count: 2
phf_tile_unref: tile: 0x10f3c7338 ref_count: 1
phf_tile_ref: tile: 0x10f3c7338 ref_count: 1
phf_tile_ref: tile: 0x10f3c7338 ref_count: 2
phf_tile_unref: tile: 0x10f3c7338 ref_count: 2
phf_tile_ref: tile: 0x10f3c7338 ref_count: 3
phf_tile_unref: tile: 0x10f3c7338 ref_count: 1
phf_tile_cache_gen[1]: tile 0x10f3c7338 wrong ref_count 0, state=0, region=0x7facc62225a0, cache=0x7fac850ac970
In the last two lines on sees a jump in reference counting of 2 (from 3 to 1), which is not expected. However, I think we are in a good track to pin-down the issue.
If you donāt mind, I have prepared a new package with even more tile-related messages in PHF_TILECACHE_DEBUG=1 mode, hopefully it will let me figure out where exactly the mismatch is taking placeā¦
Thanks!
I also got the impression that my recent changes made the preview even more responsive. Good to know that I am not the only one having this impression 
Unfortunately, I havenāt been able to get 53faf to crash in PHF_TILECACHE_DEBUG mode yet. It still crashes if I turn that off. Maybe the extra printfs have disturbed the timing enough to fix the problem (does printf have an internal mutex?). Iāll keep trying.
That is what I was afraid ofā¦ IN the version you have tested, each printf was followed by a flush of stdout in order to make sure to see the latest messages on the terminal. Maybe this is slowing down the processing too much, so I have prepared a new version without the flushing. Given that the crashes are not segfaults but are due to failed asserts, it should make no difference in terms of what is printed to the terminal.
I would suggest to give this new version a try. Also, what are your CPU specs? How many cores?
Thanks!
2,6GHz i7, 6 cores (12 threads).
3f04b is not cooperating either: it will crash with PHF_TILECACHE_DEBUG off, but not with it on.
Edit:
I managed to get 3f04b to crash:
photoflow_log8.txt.zip (6.1 MB)
I have an i5 2.9GHz with 2 cores, so this might explain why my system is not fast enough to trigger the crash.
I now suspect that the issue is due to concurrent increase/decrease of the tile reference counters (which seems to be confirmed by your latest log).
I have now protected the phf_tile_ref() and phf_tile_unref() functions with a global mutex, and also decreased again the verbosity level with PHF_TILECACHE_DEBUG=1 (you can still get more verbose output with PHF_TILECACHE_DEBUG=2).
As usual, I am not getting any crashes on my systemā¦
The new package is ready for download.
Thanks!
Iāve been running 9596d all day (about 45mins total) with PHF_TILECACHE_DEBUG=1, and it hasnāt crashed yet. Looks like you may have fixed the refCounting race condition 
There are a few problems that still need looking at:
I really hope so! It has been a real PITAā¦
Did you also try without debugging messages?
I have just started to work on a proper fix for this. If you could help me catch the controls that do not update the image, it would be great. I have already taken note of the gamut warning and the crop tool
Could you provide me a good example? Might be due to the resizing algorithm that I am usingā¦
Thanks!
Here is an example of the colour shift I mentioned:
The exported image:
The view in PhotoFlow:
The view in Photoflow at 1:1 scale:
Here are the source files:
DSC_1018rl.pfi (42.1 KB)
DSC_1018.NEF (14.4 MB)
These files are made available under a CC BY-NC-SA 4.0 Licence.
Hope this helps.
Probably the color shift is due to the CA correction in the raw developer module not updated in the āfit to screenā resize
@paulmiller @age
I confirm the color shift, but I rather suspect the demosaicing. At zoom levels below 1:1 a simple fast demosaicing is used. With the past caching mechanism, the cached image was computed at 1:1 and the re-scaled, while not the caching happens at the zoom level requested by the preview. I need to find a proper fix for this, that is force the demosaicing at 1:1 and re-scale on the fly.
I will post an update once this is doneā¦
Not a crash, but a freezing.
Follow gdb output.
As usual, I am not able to reproduce the freeze, but I am not very surprisedā¦ those seem to be quite subtle bugs, and difficult to reproduce.
Your gdb output shows however that the freeze was actually a consequence of a segmentation fault. However, the log only shows the latest function call in the stack, not the full backtrace. Next time please run the following command at the gdb prompt, to get the backtrace from all active threads:
thread apply all bt full
This is better described in the bug reporting documentation of RawTherapee: How to write useful bug reports - RawPedia
Most of what is described there also applies to PhFā¦
Thanks!