Full Sample render crashes when using 2 blender instances on same machine #28314

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Olivier Amrein · 2011-08-21T15:57:24+02:00

Olivier Amrein commented

2011-08-21 15:57:24 +02:00

%%%Dear Bugtracker,
How are you doing today on a fine sunday afternoon ? :-)
I have noticed that when 2 instances of blender try to render a scene using Full Sample, it either gives strange output images, or if u get lucky it simply crashes on of the 2 instances (as in http://www.pasteall.org/24188).
I noticed this when trying to do a "No Overwrite / Placeholder" render of an animation using 2 instances of blender on the same machine.
There is the same problem when using 2 instances of a render farm client on one machine.

I am on MAC osx, tested on 10.6 10.7

So I nailed down the problem to the naming of temporary OpenEXR files used for each sample...
I think prolbem is that both blender instance save and use the same tmp .exr filename....
Maybe adding the frame number to them could help.
Now its /tmp/SCENENAME.blend_scene_SAMPLENUMBER.exr, maybe making it /tmp/SCENENAME.blend_scene_FRAMENUMBER_SAMPLENUMBER.exr

p.s. to help get an idea this is from the console output :
write exr tmp file, 960x540, /tmp/full_sample.blend_Scene.exr
write exr tmp file, 960x540, /tmp/full_sample.blend_Scene1.exr
write exr tmp file, 960x540, /tmp/full_sample.blend_Scene2.exr
write exr tmp file, 960x540, /tmp/full_sample.blend_Scene3.exr
write exr tmp file, 960x540, /tmp/full_sample.blend_Scene4.exr
read exr tmp file: /tmp/full_sample.blend_Scene.exr
read exr tmp file: /tmp/full_sample.blend_Scene1.exr
read exr tmp file: /tmp/full_sample.blend_Scene2.exr
read exr tmp file: /tmp/full_sample.blend_Scene3.exr
read exr tmp file: /tmp/full_sample.blend_Scene4.exr%%%

%%%Dear Bugtracker, How are you doing today on a fine sunday afternoon ? :-) I have noticed that when 2 instances of blender try to render a scene using Full Sample, it either gives strange output images, or if u get lucky it simply crashes on of the 2 instances (as in http://www.pasteall.org/24188). I noticed this when trying to do a "No Overwrite / Placeholder" render of an animation using 2 instances of blender on the same machine. There is the same problem when using 2 instances of a render farm client on one machine. I am on MAC osx, tested on 10.6 10.7 So I nailed down the problem to the naming of temporary OpenEXR files used for each sample... I think prolbem is that both blender instance save and use the same tmp .exr filename.... Maybe adding the frame number to them could help. Now its /tmp/SCENENAME.blend_scene_SAMPLENUMBER.exr, maybe making it /tmp/SCENENAME.blend_scene_FRAMENUMBER_SAMPLENUMBER.exr p.s. to help get an idea this is from the console output : write exr tmp file, 960x540, /tmp/full_sample.blend_Scene.exr write exr tmp file, 960x540, /tmp/full_sample.blend_Scene1.exr write exr tmp file, 960x540, /tmp/full_sample.blend_Scene2.exr write exr tmp file, 960x540, /tmp/full_sample.blend_Scene3.exr write exr tmp file, 960x540, /tmp/full_sample.blend_Scene4.exr read exr tmp file: /tmp/full_sample.blend_Scene.exr read exr tmp file: /tmp/full_sample.blend_Scene1.exr read exr tmp file: /tmp/full_sample.blend_Scene2.exr read exr tmp file: /tmp/full_sample.blend_Scene3.exr read exr tmp file: /tmp/full_sample.blend_Scene4.exr%%%

Olivier Amrein commented

2011-08-21 15:57:24 +02:00

Changed status to: 'Open'

Campbell Barton commented

2011-08-21 16:19:04 +02:00

%%%blender should use its own temp dir with a PID subdir or something similar which is unique.
eg:
/tmp/blender/pid/full_sample.blend_Scene.exr%%%

%%%blender should use its own temp dir with a PID subdir or something similar which is unique. eg: /tmp/blender/*pid*/full_sample.blend_Scene.exr%%%

Ton Roosendaal commented

2011-08-27 17:08:08 +02:00

%%%It's a known issue & limitation. Campbell's solution would be a regression though. FSA temp saves were meant to be usable for composite after render, also when you quit and start Blender. Using process number in it would make that impossible, and even fill up the disk even quicker.

Common use for render on 1 system is to give (in commandline) each running binary own temp to save to.

Will add clear note on the todo in wiki:
http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Render#Rendering%%%

%%%It's a known issue & limitation. Campbell's solution would be a regression though. FSA temp saves were meant to be usable for composite after render, also when you quit and start Blender. Using process number in it would make that impossible, and even fill up the disk even quicker. Common use for render on 1 system is to give (in commandline) each running binary own temp to save to. Will add clear note on the todo in wiki: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Render#Rendering%%%

Ton Roosendaal commented

2011-08-27 17:08:08 +02:00

Changed status from 'Open' to: 'Archived'

Ton Roosendaal closed this issue

2011-08-27 17:08:08 +02:00

Sergey Sharybin commented

2014-01-17 12:27:07 +01:00

Changed status from 'Archived' to: 'Duplicate'

Sergey Sharybin commented

2014-01-17 12:27:07 +01:00

✘ Merged into #37974.

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Full Sample render crashes when using 2 blender instances on same machine #28314