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

[Matthew Farrellee <matt@xxxxxxxxxx>]

On 04/11/2012 12:35 AM, Guy K. Kloss wrote:
> Hi all,
>
> in a cycle scavenging scenario for Win 7 lab machines (Condor 7.6.6),
> we've hit the problem that the nodes were running a worker per HT CPU
> core, and not per physical CPU core. Therefore, when people logged in,
> the machine may be a bit too sluggish. We've had complaints ... :-/
>
> With joy I have found out that the COUNT_HYPERTHREAD_CPUS=False
> directive in the configuration would help. However, things have
> unfortunately not changed. I've tried to drill down the problem by
> following the instructions as given in the thread this message belongs
> to [1]. Too bad, the only info I got from this was
>
> > condor_config_val -debug NUM_CPUS
> 04/11/12 14:27:04 Locale: English_United States.1252
> Not defined: NUM_CPUS
>
> Then trying to drill deeper, I stumbled across this ticket in the bug
> tracker [2]. Is it possible, that the HT CPU handling is still not
> implemented for Wintendo? If so, what are the suggestions to solve this
> problem, which might *not* involve having to manually set the number of
> CPUs for each and every machine (we've got quite a heterogeneous
> environment, and Condor is rolled out using an automated deployment.
>
> Any suggestions are welcome!
>
> Thanks in advance,
>
> Guy
>
>
> [1]
> https://lists.cs.wisc.edu/archive/condor-users/2011-November/msg00074.shtml
> [2] https://condor-wiki.cs.wisc.edu/index.cgi/tktview?tn=1721,14

Given the ticket is still open, I'd surmise that the bug is still there.

Set TOOL.DEBUG = D_FULLDEBUG to see the processor calculation when you 
pass -debug to condor_config_val.

* * *

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


Best,


matt