[GE users] Correct Way to Reduce Number of Slots?

templedf dan.templeton at sun.com
Wed Jan 6 20:06:59 GMT 2010


The number of CPUs is just informational and is unrelated to the number 
of slots (other than that the default number of slots chosen during 
installation is based on the number of CPUs).  You did it right.

Daniel

jlforrest wrote:
> I have a pseudo-cluster of 12 dual processor
> Mac Pros all running Mac OS 10.5 and SGE 6.2u4.
> (I say pseudo-cluster because these Macs
> are also being used as desktop machines
> for grad students).
>
> 3 of these Mac Pros are newer than the rest,
> and have dual Nehalem processors which support
> hyperthreading. This makes them look like they
> have 16 cores, but they really only have 8.
>
> SGE correctly sees 16 CPUs and slots on these
> 3 Macs. However, the users don't like this because
> it means that although these machines can run twice
> as many jobs as the other Macs, each job takes
> twice as long to finish. Seeing results sooner
> is more important to them then seeing lots of results.
>
> So, I tried to modify my SGE configuration so that
> SGE would only see 8 slots on these Macs. I ran
> 'qconf -mconf all.q' and changed the number of
> slots for the 3 Macs to 8. This kind of worked,
> as shown by the following line of output from
> 'qstat':
>
> all.q at xxx.cchem.berkeley.ed BIP  0/15/8  15.13 darwin-x86
>
> There are 15 slots in use because they were in use before
> I made the change. The total number of slots reflects
> the change I made.
>
> However, when I run 'qmon' and look at the Queue Control->
> Hosts page, the "#CPU" column still shows 16. I was
> expecting this to also show 8.
>
> What am I doing wrong? Is there a better way to do
> this?
>
> Cordially,
>

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