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cyseal
Adept III

Cycles and OpenCl error

On AMD 7870, 16.12.2

It seams this is reproducible on Win 10 so there could be some issue with WDDM 2.0 and older GCN1 cards.

Download Blender

1. Go to File->User Preferences-System - Check OpenCl, save user settings

s1.JPG

2. Click Emulate Numpad , save settings and close window

s2.JPG

3.  Press number 0 on numpad (you will go to camera view)

4.Switch to Cycles and device GPU compute. Set tile size to 512x512 under Performance.

s3.JPG

5. Go to create tab -> Plane, radius 50

s4.JPG

6. Right click on cube -> Click ROUND ICON, Click New material

s5.JPG

7. Render the scene, wait while scene is rendered

s6.JPG

8. Go to this tab and click 3D view

s7.JPG

9. Go to this tab, click on it and click Rendered (wait while kernels are loaded )

s789.JPG

10. Go to the same tab again and click Solid  (wait while kernels are loaded )

11.Go to material tab of the cube from step 6. and change roughness of material

S78.JPG

12. Repeat step 9. and 10.

13. Click render again,  click Window -> Toggle system console

s8.JPG

s9.JPG

Tags (2)
9 Replies
dipak
Staff
Staff

Re: Cycles and OpenCl error

Hi Sam,

As I ran the same on similar setup, I didn't observe any such error. Please find the setup details as below:

blender-2.78.0-git.911544c-windows64

Crimson 16.12.2

Windows 10(64) (RAM 4GB)

HD 7870 (Global memory 2GB)

blender.png

cyseal
Adept III

Re: Cycles and OpenCl error

Could you try this steps but using bigger tile sizes and changing difuse material into glossy. Then opening Viewport shading - Rendered  twice before rendering final image in last step.

tile.jpg

dipak
Staff
Staff

Re: Cycles and OpenCl error

Hi Sam,

I was able to reproduce the error (i.e. CL_MEM_OBJECT_ALLOCATION_FAILURE) for larger tile sizes (e.g. 256x256, 512x512) (find the setup details below). As following the previous steps, each time the error occurred at step 9 [Go to this tab, click on it and click Rendered (wait while kernels are loaded )].

Reducing the tile size to 128x128, it worked fine. However, as checked with GPU-Z, consumed GPU memory was more than 1GB for this setting (find the attachment).

It seems that the issue is due to insufficient device memory as correctly reported by the runtime. I think, the size of the memory objects created for the lager tiles by the host code (part of Blender application) could indicate the issue more clearly.

Btw, I didn't observe any issue when ran the testm.blend file (:anchor: T50694 AMD 7870 2GB memory issue/OpenCl ) with tile size 512x512 (find attachment).

Setup:

Blender version: blender-2.78-34a502c-win64

Driver: Crimson 17.2.1 public (16.60.2011-170210a-311139E-ATI)

Device: HD 7870 (Pitcairn)

Regards,

cyseal
Adept III

Re: Cycles and OpenCl error

Thank you. But, how come simple cube scene can have more than 1GB consumed when rendering for example 512x512 ?

Is it possible there is somewhere memory leak?

dipak
Staff
Staff

Re: Cycles and OpenCl error

I don't think we can point it as a driver or application level issue unless it's checked with multiple drivers and blender versions and get any regression point, if any. I haven't checked it with older drivers (other than 16.12.2) and Blender version, so, can't sure about that. I shared my findings what I observed. If you've any observation in this regard, it would be helpful to trace the issue.

Regards,

dipak
Staff
Staff

Re: Cycles and OpenCl error

Update:

After checking with multiple drivers and Blender versions, the issue seems related to the driver (still working on regression) particularly on Windows 10. Here are my findings till now:


With latest drivers
--------------------------------

Crimson 17.2.1 and 16.12.2 on Windows 10: observed the memory  error.

Crimson 17.2.1 and 16.12.2 on Windows 7:  worked fine without any error.

With older drivers on Windows 10:

-----------------------------------------------

16.11.5 and  16.9.2: no error however there was some rendering issue for step 7 (no object seen). It rendered correctly for 3-D View though (i.e. step 9 and 12)

15.9.1: everything worked fine without any error

I'll check with the latest internal builds and let you my findings.

Note: Blender version used: blender-2.78-34a502c-win64

Regards,

dipak
Staff
Staff

Re: Cycles and OpenCl error

Just to inform you that a ticket has been raised against this issue. Once I get any further update, I'll share with you.

Regards,

cyseal
Adept III

Re: Cycles and OpenCl error

Thank you so much Dipak!

cyseal
Adept III

Re: Cycles and OpenCl error

Todays build of Blender has improvement with Cycles split kernel.

Includes SSS/Volume rendering on AMD GPU.

It does not work on 7870.

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