Re: [HTCondor-users] limiting number of core used

[Todd L Miller <tlmiller@xxxxxxxxxxx>]

> What is the proper way to limit the number of cores condor will use?

	If you use NUM_CPUS, you'll have more flexibility in how you 
configure your slots.  However, regardless of whether you set NUM_SLOTS 
or NUM_CPUS, HTCondor will only /assign/ that number of cores to jobs; 
limiting the number of cores actually /used/ by jobs is another matter 
entirely.  I believe the current best practice is to use cgroups; see 
section 3.14.15 in the manual.  Note that cgroups aren't hard limits; 
you'd have to assign cpu shares to whatever else on the system is using 
the other cores to make sure they get their share if there's contention.

- ToddM