Re: [Condor-users] hyper-threading on Win compute nodes

[Ziliang Guo <ziliang@xxxxxxxxxxx>]

Hi, I'm the guy that's been assigned the ticket today (imagine my
surprise when I checked my email).  We have a plan for detecting
hyperthreaded cores, but the bad news is Microsoft only added support
for this in Vista and higher, so if you are on an XP machine, I'm
afraid the problem will remain.

Z

On Wed, Apr 11, 2012 at 4:42 PM, Guy K. Kloss <guy.kloss@xxxxxxxxx> wrote:
> Hi Matt,
>
> On 12/04/12 00:25, Matthew Farrellee wrote:
>> Given the ticket is still open, I'd surmise that the bug is still there.
>
> That's what I've been fearing ... :-(
>
>> Set TOOL.DEBUG = D_FULLDEBUG to see the processor calculation when you
>> pass -debug to condor_config_val.
>
> Tried that, but under Windows the output is rather sparse in comparison
> to Linux. There's apparently no calculation of processors involved under
> Windows, at least none that the D_FULLDEBUG would report about. See the
> output in my mail for the condor_config_val command, the only additional
> info spat out with the D_FULLDEBUG was the info on the locale.
>
>> Ok, I can confirm it won't work on Windows...
>>
>> $ grep -B3 -A1 COUNT_\HYPERTHREAD_CPUS src/condor_sysapi/reconfig.cpp
>> #ifdef LINUX
>>     /* Should we count hyper threads? */
>>     _sysapi_count_hyperthread_cpus =
>>         param_boolean_int("COUNT_HYPERTHREAD_CPUS", 1);
>> #endif
>
> Thanks for tracking down and confirming this.
>
> Too bad, as particularly for cycle scavenging scenarios on (lab)
> machines this would be a particularly useful feature.
>
> I'll have to look into some sort of deployment script that'll detect the
> number of physical CPU cores only and generate a condor_config.local
> file with a set NUM_CPUS field, I guess.
>
> Anyway, thanks for looking into that. I know what to do now (pimp up a
> deployment script).
>
> Guy
>
> --
> Guy K. Kloss
> School of Computing + Mathematical Sciences
> Auckland University of Technology
> Private Bag 92006, Auckland 1142
> phone: +64 9 921 9999 ext. 5032
> eMail: Guy.Kloss@xxxxxxxxx
>
>
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Condor Project Windows Developer