If people are interested in trying this, there are two important
startd policy config settings I'd recommend:
1) set JOB_RENICE_INCREMENT=20 so that, if the Condor job is competing
with an interactive user, the interactive user will get the
overwhelming majority of CPU time at Condor's expense.
2) set your SUSPEND expression to suspend the condor job if there is
an interactive user *and* the machine's free memory drops below a
certain threshold. This will prevent the situation alluded to below,
where the Condor job affects an interactive user through its memory
use, rather than its CPU use.
Good luck!
-Peter
On Apr 8, 2005, at 11:54 AM, John Wheez wrote:
This is true. I sometimes do work on my Windows computer as a condor
job runs in the background on Windows. You do run the risk of having
a job fail though if the students are doing tasks which are very RAM
intensive or if they crash the computer....
some people report that if you use mapped drives, the drive mapping
willbe lost to the condor user when the student logs in...i've not
really noticed this on my system..so do a test first of course.
your students will also notice tha teh computer can be slow and
slugish if the background task is demanding. If you have a dual cpu
system you can try to send condor tasks to one cpu and leave the ther
cpu available for the student tasks.
JW
Masao Fujinaga wrote:
At the recent condor week, I heard people talking about running
condor jobs in the background in student labs running windows. They
said that as long as the jobs did not use a lot of memory, the
interactive users did not notice the presence of the condor jobs
running. If this were the case, it would be a great improvement to
putting the jobs to sleep whenever there was an interactive user.
Has anybody documented this minimal impact of condor jobs? We would
use such a document as argument to the people responsible of our
labs to let us run condor continuously.
Masao
--
Masao Fujinaga | Research Computing Support
fujinaga@xxxxxxxxxxx | Computing and Network Services
Tel.: (780) 492-2117 | University of Alberta
Fax.: (780) 492-1729 | Edmonton, Alberta, CANADA
--
Peter Couvares University of Wisconsin-Madison
Condor Project Research Department of Computer Sciences
pfc@xxxxxxxxxxx 1210 W. Dayton St. Rm #4241
(608) 265-8936 Madison, WI 53706-1685
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