[gridengine users] Question about load average and slots and non-SGE-managed tasks...

Reuti reuti at staff.uni-marburg.de
Tue May 7 17:28:35 UTC 2013


Am 07.05.2013 um 19:09 schrieb Stephen Spencer:

> Good morning.
> I'm administering a cluster of machines with SGE (6.2u5, from the RHEL distro) and have a question concerning the scheduler's behavior. (I'm rather new to SGE.)
> On this cluster, users can and do log in (via 'ssh') and run computational tasks on cluster nodes, which ties up resources but not an SGE 'slot' because the tasks aren't submitted through SGE.
> My question is this: does SGE take into consideration the current load average on a node when assigning tasks? For example, given two nodes with equivalent numbers of slots, and one node has a load average of 10 and the other 0, will SGE send a waiting job to the node with less load?
> I see "load_thresholds   np_load_avg=1.75" in the output of "qconf -sq all.q" and am guessing that if the value of "np_load_avg" on a given host, as SGE calculates it, is greater than 1.75, tasks will be assigned elsewhere first, but that's only a guess. Confirmation, or clarification of what this means, would be wonderful.

The explanation you can get from `man queue_conf`.

-- Reuti

> Thank you.
> Best, 
> -- 
> Stephen Spencer
> spencer at cs.washington.edu
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