Cycles Viewport freezes at 1 sample #32800

New Issue

Manson Mamaril · 2012-10-07T01:44:11+02:00

Manson Mamaril commented

2012-10-07 01:44:11 +02:00

%%%Specs:

Intel i3
2GB RAM
2GB Nvidia GeForce GT520
Windows 7 Professional

As the title says, everytime I activate viewport rendering in cycles it is always stuck at 1 sample and never goes forward... well that's all I can say for now... %%%

%%%Specs: - Intel i3 - 2GB RAM - 2GB Nvidia GeForce GT520 - Windows 7 Professional As the title says, everytime I activate viewport rendering in cycles it is always stuck at 1 sample and never goes forward... well that's all I can say for now... %%%

Manson Mamaril commented

2012-10-07 01:44:11 +02:00

Changed status to: 'Open'

Thomas Dinges commented

2012-10-07 15:28:09 +02:00

%%%Which Blender version do you use? Also please provide a blend file where the issue happens... I can't confirm this here with 2.64, and a nvidia 540M. Also do you use 32 or 64bit OS? %%%

Brecht Van Lommel commented

2012-10-07 16:08:50 +02:00

%%%Also please mention if you are doing CPU or GPU rendering.%%%

Steven van der Veen commented

2012-10-08 11:57:04 +02:00

%%%I have the same issue with the with booth CPU and GPU (cypress 2x) cycles viewport rendering with some blend files. See attachment. Other files and the cube start-up file work fine.

specs:

blender 2.64 (r51026)
windows 7 prof. 64bit
12GB Ram
2x intel Xeon E5520 @ 2.27GHz
Ati Radeon HD 5900 serie

Regards, Steven
%%%

%%%I have the same issue with the with booth CPU and GPU (cypress 2x) cycles viewport rendering with some blend files. See attachment. Other files and the cube start-up file work fine. specs: - blender 2.64 (r51026) - windows 7 prof. 64bit - 12GB Ram - 2x intel Xeon E5520 @ 2.27GHz - Ati Radeon HD 5900 serie Regards, Steven %%%

Sergey Sharybin commented

2012-10-08 12:34:42 +02:00

%%%Using 512x512 tiles isn't a nice idea here -- this ends up with tiles like 2 pixels large which makes rendering really really slow (it not stuck, it just incredible slow). For final rendering there's a clamping happens to prevent small tiles. Attached a patch which does the same for preview.

Would want Brecht to check if it's indeed ok.

@brecht, i also seems tile clamping for renders with buffers enabled doesn't happen correct -- it allows to have tiles 2x2 pixels. Is it intended?%%%

%%%Using 512x512 tiles isn't a nice idea here -- this ends up with tiles like 2 pixels large which makes rendering really really slow (it not stuck, it just incredible slow). For final rendering there's a clamping happens to prevent small tiles. Attached a patch which does the same for preview. Would want Brecht to check if it's indeed ok. @brecht, i also seems tile clamping for renders with buffers enabled doesn't happen correct -- it allows to have tiles 2x2 pixels. Is it intended?%%%

Brecht Van Lommel commented

2012-10-08 13:03:04 +02:00

%%%Clamping the tile size sounds fine, and it should happen for save buffers also, if it doesn't work don't think that's intentional. I don't see any patch attached though.%%%

Sergey Sharybin commented

2012-10-08 13:09:51 +02:00

%%%Brecht, initial patch is attached now. Would check on buffers tiles as a separate change.%%%

Brecht Van Lommel commented

2012-10-08 13:23:13 +02:00

%%%Patch looks fine to me.%%%

Tobias Oelgarte commented

2012-10-08 13:43:41 +02:00

%%%In the recent time i made multiple tests with different tiles sizes. If I'm not entirely wrong then there is something like an optimal tile size (not tile count) for different GPUs. Hitting it perfectly gives a great performance boost. On a GTX 560 TI i came to the conclusion that the for small renderings 1x1 would be the best. For larger images it isn't as good, and 2x2 or 4x4 renders faster. Same appeared on other graphics cards as well, but with different tile sizes. So in the end i have to assume that there is some kind of optimal size for each GPU. But for the user it means that he has to go trough various settings to figure out which tile size (he actually sets the number of tiles) would be optimal. Shouldn't Blender use the resolution of the tiles instead, and maybe have internal presets for various GPUs?%%%

%%%In the recent time i made multiple tests with different tiles sizes. If I'm not entirely wrong then there is something like an optimal tile size (not tile count) for different GPUs. Hitting it perfectly gives a great performance boost. On a GTX 560 TI i came to the conclusion that the for small renderings 1x1 would be the best. For larger images it isn't as good, and 2x2 or 4x4 renders faster. Same appeared on other graphics cards as well, but with different tile sizes. So in the end i have to assume that there is some kind of optimal size for each GPU. But for the user it means that he has to go trough various settings to figure out which tile size (he actually sets the number of tiles) would be optimal. Shouldn't Blender use the _resolution of the tiles_ instead, and maybe have internal presets for various GPUs?%%%

Sergey Sharybin commented

2012-10-08 13:52:14 +02:00

%%%Commited the patch to rev51179, will look into buffers tile size later.

As for tile resolution it could indeed be better way to control tiles for GPU, but such a discussion out of scope of bug tracker :)%%%

%%%Commited the patch to rev51179, will look into buffers tile size later. As for tile resolution it could indeed be better way to control tiles for GPU, but such a discussion out of scope of bug tracker :)%%%

Sergey Sharybin commented

2012-10-08 13:52:14 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2012-10-08 13:52:14 +02:00

Steven van der Veen commented

2012-10-08 14:37:36 +02:00

%%%It was not intended to set the tile count that high, but I altered the value in the past for testing and I forgot about it (previous Blender versions worked fine with the high count). I lowered the tile count for the attached Blend file and it doesn't freeze anymore!

Thanks %%%

%%%It was not intended to set the tile count that high, but I altered the value in the past for testing and I forgot about it (previous Blender versions worked fine with the high count). I lowered the tile count for the attached Blend file and it doesn't freeze anymore! Thanks %%%

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Cycles Viewport freezes at 1 sample #32800