Subject: Re: Thread benchmarks, round 2
To: Mindaugas R. <>
From: Kris Kennaway <>
List: tech-kern
Date: 10/06/2007 19:35:15
Mindaugas R. wrote:
> Andrew Doran <> wrote:
>>> I was only able to run in the 8 CPU configuration because when I tried 
>>> to disable CPUs with cpuctl, processes would hang under load.  This is 
>>> probably a scheduler issue.
>> Right, I doubt that bit has been well tested since the scheduler is so new.
> In this case, it is not a matter of testing - just left this part for more
> thought, while this functionality is not used much. Anyway, I have made a
> primary patch for this, hope will be useful shortly.
> Kris Kennaway <> wrote:
>> John Nemeth wrote:
>>>      cpuctl doesn't truly disable the cpus.  You would probably need to
>>> disable them in the BIOS or build a custom kernel.
>> How do I disable them in the kernel?
> Switching the CPU offline with cpuctl keeps the execution of bound threads
> only. At this moment, it should be OK for the benchmarking.

Except it didn't work, as above ;-)