Posts by HugoNotte
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1) Message boards : Windows : opencl_amd_cpu using all cpu cores instead of boinc limit (Message 19047)
Posted 1377 days ago by HugoNotte
Beware a "gotcha" .... :)
A twist to all this ..... you can get into a royal pickle by not having the settings inside the Collatz Preferences set correctly, and that can produce the symptom you described. Check and make sure you have tagged the correct option inside Collatz Preferences, inside the Run only the selected plan classes part at the bottom of the options lists. You will need ONLY the second option ticked OpenCL for AMD GPUs (opencl_amd_gpu). Untick all others.

If you have OpenCL for AMD/Intel CPUs (opencl_amd_cpu) ticked, it will use all CPUs you have, no matter what else you do, that setting overrides everything else, you must only have ticked the option I showed above to be able to control the number of CPUs it uses.


Thanks for the explanation. I went to check the settings, but "OpenCL for AMD/Intel CPUs (opencl_amd_cpu)" wasn't even ticked. Hence I am not sure were I got that work unit from.
Since I got a nVidia card, I have the options "cuda" & "OpenCL for nVidia" ticked, not the AMD GPU one. Is that correct?

Do the settings in the app_config.xml do anything different than the settings in the Boinc Manager GUI?
2) Message boards : Windows : opencl_amd_cpu using all cpu cores instead of boinc limit (Message 19044)
Posted 1377 days ago by HugoNotte
That's not what I am talking about. I am talking about all 8 cpu cores being used to almost 100% by that one type of collatz application. When other single threaded projects are running, the workload of 6 cores is spread over the 8 cores, as you describe. In that case total cpu use is lower and so are the temperatures. When collatz 6.04 opencl_amd_cpu runs, cpu usage goes up to almost 100% and the temperatures are rising, which is my main concern.
3) Message boards : Windows : opencl_amd_cpu using all cpu cores instead of boinc limit (Message 19042)
Posted 1377 days ago by HugoNotte
On an AMD FX8320 the opencl_amd_cpu application runs on all 8 cores, instead of only 6, as I have set a limit (75% of all cores) in the boinc manager.
In the boinc manager task window, it claims to run on 6 cores only, but cpu core usage clearly shows the application uses all 8 cores.
Is there any way to adjust settings, e.g. in a collatz config file?




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