Re: [HTCondor-users] RANK question; slots unclaimed on a single computer

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 8/8/2014 1:02 PM, Ralph Finch wrote:
> Ben and Todd, thanks much for the helpful replies.
>
> A little more explanation:
>
> We have a single Windows7x64 HTC pool of about 90 cores among about 20
> deskside machines. Most have 4 cores, but two have 16 cores, and those two
> have clock speeds of 2.2 and 3.3 GHz, enough to make a difference in job
> speed. Typical jobs are 1000+ at a time, and each one takes 5-10 mins to
> finish. Of the 90 cores, up to 75-80 are usable, the remaining don't have
> enough disk space or their HTC install is boogered and I need to fix that.
>
> We've noticed that as the last core is claimed and run on the 4-core
> machines, interactive use becomes fairly dismal.

Some additional random thoughts re using the last core problem, besides 
using RANK -

+ Your start expression on your execute machine could only allow Slot1 
to be claimed during the night and/or weekends, when interactive use is 
unlikely, and/or your preempt expression could kick off the job on Slot1 
when keyboard activity is detected.

+ You could permanently reserve one core for interactive use by the 
owner with
    NUM_CPUS = $(DETECTED_CPUS) - 1

regards,
Todd