Re: [HTCondor-users] Tracking available memory on a compute host

[Todd L Miller <tlmiller@xxxxxxxxxxx>]

> "All machines in the HTCondor pool advertise their resource
> properties, both static and dynamic, such as *available RAM memory*,
> CPU type, CPU speed, virtual memory size, physical location, and
> current load average, in a resource offer ad." --

	Yeah, that phrasing is not so good; I can see why you'd think 
"available RAM memory" would be a dynamic attribute.  This may mean that, 
like it reports system-wide usage for CPUs (with the misnamed LoadAvg), 
HTCondor should report system-wide usage of memory.

> But just like a CPU core can be used by the owner and then free for 
> Condor usage later, I would think RAM should be as well.

	However, even for CPUs, HTCondor does not adjust the number of 
reported CPU cores based on usage; instead, it reports the usage and 
allows the startd administrator and the job submitter to decide how much 
overcommitment is too much.  (As the admin, you can use the START 
expression to turn down new work if the machine is too busy and the 
PREEMPT expression to jettison old work.)

- ToddM