Re: [Condor-users] Changing the time interval for matching

[Stephen McGough <stephen.mcgough@xxxxxxxxxxxxxxx>]

Dear Peter, David, All,

Many thanks for this. We'd already tried taking NEGOTIATOR_INTERVAL down (to 20 seconds) without getting the desired result. Though we've not played around with SCHEDD_INTERVAL and I'll let you know if it has the desired effect.

Cheers,

Steve..


On 16/02/2011 16:49, "Peter Doherty" <doherty@xxxxxxxxxxxxxxxxxxx> wrote:



On Feb 15, 2011, at 16:49 , David Brodbeck wrote:

>
>
> On Mon, Feb 14, 2011 at 7:23 AM, Stephen McGough <stephen.mcgough@xxxxxxxxxxxxxxx
> > wrote:
> Dear All,
>
> We have successfully set up a cluster which uses a non Condor method
> for sleeping Windows 7 computers and uses Rooster to wake up these
> computers when jobs are waiting. However, we now have a race
> condition. The University here have a tight requirement for shutting
> down computers "out of hours" and if no Condor job starts within 5
> minutes the computer will be powered down. We have also seen that it
> can take Condor 5 minutes to match and start a job on a computer
> once Rooster has woken it up. At the moment we're seeing a number of
> jobs which wake a computer up, fail to start in 5 mins so the
> computer goes to sleep, just to wake up another computer. All jobs
> now run but it would be good to remove these unwanted wake-ups.
>
> To do this we would like to reduce the amount of time Condor takes
> to match (we're trying to extend the time interval before a computer
> sleeps too). The START expression evaluates directly to true "out of
> hours".
>
> You might try tweaking NEGOTIATOR_INTERVAL.  The default is 300
> seconds before 7.4.0, 60 seconds after.  At our site we set it to 30
> to reduce the amount of time jobs would spend sitting in the queue;
> we have a small cluster so the extra load on the central manager has
> not been a problem (or even noticeable, really.)
>
Also look at the SCHEDD_INTERVAL  You can decrease that as well,
although a SUBMIT event should trigger a new SCHEDD cycle to start,
unless you've tweaked that setting.

-Peter
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