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OpenCL

arsenm
Adept III

GPU clock speed reported as 0 Mhz

I've seen this problem come and go every few Catalyst releases where the CL_DEVICE_MAX_CLOCK_FREQUENCY is reported as 0 (you can see it from clinfo). It seems to come and go; right now I've noticed that on Linux it happens if I'm SSHed in, but not if I'm actually using the display.

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jeff_golds
Staff
Staff

Re: GPU clock speed reported as 0 Mhz

There currently is no console support for Linux.  I believe that there needs to be an X Server running for OpenCL to work correctly.  If X is already running and you still get bad results, try redirecting your display to your host machine.

(I am not a Linux expert.)

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arsenm
Adept III

Re: GPU clock speed reported as 0 Mhz

The X server is running, and it does work the same except for the 0 Mhz thing.

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jeff_golds
Staff
Staff

Re: GPU clock speed reported as 0 Mhz

Hmm weird!  I'll file a bug.  Thanks for reporting the issue.

Mind providing some more info?  GPU, Linux version, driver version, SDK version, etc.  Thanks!

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arsenm
Adept III

Re: GPU clock speed reported as 0 Mhz

Right now it is happening on one system running Ubuntu 11.10 x86_64 with Catalyst 12.1 on a Radeon 4870, and on another Ubuntu system for both a Radeon 5870 and 7970 using the special 7900 driver from http://support.amd.com/us/kbarticles/Pages/catalyst121linuxdriver.aspx

clinfo gives:

  Max clock frequency:                    0Mhz

...

  Name:                                          ATI RV770

  Vendor:                                        Advanced Micro Devices, Inc.

  Device OpenCL C version:             OpenCL C 1.0

  Driver version:                              CAL 1.4.1664

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