[GE users] question on slotwise preemption configuration

stephendennis sdennis at univaud.com
Thu Jul 22 20:55:11 BST 2010


Hi John

We work around the necessity of providing the slot counts with syntax and
configuration like this.

subordinate_list=slots=8(low:2:sr), \
  [@4_slot=slots=4(low:0:sr)], \
  [@8_slot=slots=8(low:1:sr)]

As you can see we set host groups for each range of slot counts.

There is a bug in 6.2u5 which leaves jobs in suspension sometimes
http://gridengine.sunsource.net/issues/show_bug.cgi?id=3233

SGE Engineering tells me that it is fixed in 6.2u6

We have a patched version of lx24-amd64 qmaster for version 6.2u5 which addresses
the issue which I can provide if you contact me of list.

Thanks
Stephen
________________________________________
From: cjf001 [john.foley at motorola.com]
Sent: Thursday, July 22, 2010 3:47 PM
To: users at gridengine.sunsource.net
Subject: [GE users] question on slotwise preemption configuration

Guys -

I have a question regarding slotwise preemption. (I did a
search of the archive and only found 2 entries with this topic,
so I don't think this has been covered... would be nice if the
searcher could search the bodies of the posts, and not just the
subjects....)

Anyway, I have 2 cluster queues - "primary" and "secondary".
"secondary" is subordinate to "primary". It was this way before
I upgraded to v6.2u5 from v6.2u2; it still works as before -
that is, if I fill the slots on a host with jobs in the secondary
queue, and then submit a job into the primary queue, all the
jobs in the secondary queue are suspended until the primary job
finishes. As expected.

So, I would like to take advantage of the slotwise preemption feature.
After reading the page at:

http://wikis.sun.com/display/gridengine62u6/How+To+Use+Slotwise+Preemption

and the queue_conf man page, I'm left wondering if this is going to
work for me, because.....

...the descriptions show a syntax of (for my case, of my "primary"
queue) :

"subordinate_list slots=2(secondary)"

where the "2" is the total number of slots on the host. And that's
my problem - my queues ("primary" and "secondary") are across all
my hosts - and some of them have 2 slots, and some have 4 slots, and
some even have 8 slots.

So, is there a way to specify my "primary" queue config that will
work for all the hosts, regardless of how many slots they have ?

(SGE knows how many slots there are on each host anyway, so I'm wondering
why we should even need to specify this number ?...)

What am I missing ?

     Thanks !

        John



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