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

["Guy K. Kloss" <guy.kloss@xxxxxxxxx>]

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

-- 
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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