Archives Discussions

[sh2]

Latest beta drivers seems to support gcn additional compute rings.

No gui and mouse freeze!

Requirements:

0. SI/gcn hardware

1. 12.9 drivers

2.  "set GPU_USE_COMPUTE_RINGS=1" env. variable

[dmeiser]

I've never heard of the GPU_USE_COMPUTE_RINGS environment variable. Was this added in 12.9? What is it supposed to do?

Cheers,

Dominic

[sh2]

It's unsupported and undocumented feature(for now). It enables two additional hw queue fetchers (ACE), so graphics and compute tasks could run simultaneously.

[dmeiser]

Thanks for the response. That's very helpful.

Dominic

[pwvdendr]

Could you please detail how to "set GPU_USE_COMPUTE_RINGS=1 env. variable"? Should one declare this inside the .cl file? I'm not getting it to work. Or is this some unix-only terminal thing?

Also, does this mean that we can now run kernels of >5 seconds without the watchdog kicking in?

[nou]

yes it is unix terminal thing. you can run "export GPU_USE_COMPUTE_RING=1" or "set GPU_USE_COMPUTE_RING=1"

you can set enviroment variables on windows too. use google.

[pwvdendr]

Ok, so it is only usable for those running OpenCL from the command line, not for those running OpenCL through a framework such as JOCL? That's too bad. I'll see if I can find a way around it.

[nou]

framework is irelevant as you set this variables before execution of program.

[sh2]

No, watchdog timer remains as is.

[pwvdendr]

Well, I tried it for windows 7 and JOCL and I still had mouse freezes even after setting the environment variable and rebooting. It is with the 12.10 drivers though, but I presume they won't remove such a feature...