World multiple importance sample CUDA error #40228
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Reference: blender/blender#40228
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System Information
Win 7 64 bits, AMD Phenom II X6 1090T
8Go
GPU GEFORCE 580 3Go, TITAN, TITAN BLACK
Blender Version
Any version since Multiple Importance Sampling have existed in the world menu (!)
Short description of error
Enabling World menu Multiple Importance Sampling with all GPU enabled (even the one to display) cause "CUDA error: Unknown error in cuCtxSynchronize()" (and crashe renders)
Turn Off World menu Multiple Importance Sampling and render works fine !
Best regards
Changed status to: 'Open'
Added subscriber: @remibug
Does it work with the individual GPUs?
Yes works fine with only one GPU (even the displaying one).
Added subscriber: @zuggamasta
System Information
Win 7 64 bits, Intel Core i7 X980 3.33Ghz, 24GB ram
3 GPU setup:
2x GEFORCE 480, GEFORCE 750ti
Blender Version
Multiple versions with sm_50 compatibility.
Error
When using all 3 GPUs, the Mem Load gets unusual big with the error:
"CUDA error: Unkown CUDA error value in cuMemFree(cida_device_ptr(mem.device_pointer))"
BVH etc. gets built but then the image stays black
When deactivating MIS, everything works as expected.
Added subscriber: @ThomasDinges
CUDA error: Unknown error in cuCtxSynchronize()to World multiple importance sample CUDA errorPlease give the specific version number of the latest version that crashes, it's not clear to me if this happens in the 2.70a release or the latest test builds as well.
Does this happen on the default cube .blend file, no settings changed except enabling this option? Does the Map Resolution have an influence, does lowering it stop the error?
Hi Brecht,
The build from today
07e8096
win64, still crashes with the default cube + activated MISWhen Lowering the Map Resolution from the default 256 down to 128 the default cube is rendered with no CUDA error.
A Map Resolution of 255 is the highest value which worked for me. Everything higher crashes.
Hi guys,
Win 7 64 bits, AMD Phenom II X6 1090T
Hash
19e627c
(official 2.70, I presume) and buildbot build : Hash30361a7
Factory Setting with default cube, 3 GPU rendering, Multi Importance Sampling Enabled --> Crash.
Map Resolution [0;255] = works fine
Map Resolution > 255 = crash.
I think a damn real bug has been spotted !
Thanks.
This issue was referenced by
865dfa8a7e
Changed status from 'Open' to: 'Resolved'
Closed by commit
865dfa8a7e
.