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Re: [condor-users] Pc's with hyperthreading
- Date: Thu, 22 Apr 2004 19:45:21 -0500
- From: Erik Paulson <epaulson@xxxxxxxxxxx>
- Subject: Re: [condor-users] Pc's with hyperthreading
On Fri, Apr 23, 2004 at 10:30:32AM +1000, Ian.McLeod@xxxxxxxx wrote:
> Our latest crop of Pc's are coming with hyperthreading
> The computers are pretending to have 2 cpu's
> Two questions
> 1. How do I want to convince condor that it really has only one CPU
> I found the NUM_CPUS in the config file -
> but I note that its use is not recommended.
For disabling hyperthreading, that is the recommended solution.
Many machines will let you disable hyperthreading in the BIOS
In Condor 6.6.5 (still a few weeks off), we have a
COUNT_HYPERTHREAD_CPUS = FALSE
option, which will detect if some of the CPUs are hyperthreads
and not count them, so you can set this as a global config file.
It's currently a Linux-only option, we'll see if we can make it work
on Windows too.
> 1. How good is the hyper-threading technology ?
> Should I be trying to convince condor that it really has only one CPU
As with all things HPC, it depends on the app :)
For the most part, here at UW we've disabled it to keep the RAM per
virtual machine high.
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