[GE users] Reservation trouble

skylar2 skylar2 at u.washington.edu
Thu May 28 16:04:01 BST 2009

I'm having trouble getting slot reservations working with 6.1u6. Our
cluster mostly services long-running single slot jobs, but occasionally
we get multi-slot jobs that must run on a single node. We service those
with a special parallel environment with its allocation rule set to
$pe_slots. We're trying to use resource reservations to get SGE to allow
a node to empty out so that the multi-slot single-node jobs can run.
Unfortunately, SGE appears to be backfilling the smaller jobs in front
of the multi-slot jobs. Here's what I'm seeing in the scheduler log:

693995:1:RESERVING:1243522207:59:Q:all.q at sage023.grid.gs.washington.edu:slots:7.000000
693119:1:STARTING:1243522192:59:Q:all.q at sage023.grid.gs.washington.edu:slots:1.000000

This was at a point when sage023 already had three out of eight slots
used, so SGE shouldn't have scheduled any more jobs to run on sage. We
have the default h_rt set to INFINITY in the hopes that would disable
backfilling, but it doesn't appear to be working. Is there anything else
we can try?


-- Skylar Thompson (skylar2 at u.washington.edu)
-- Genome Sciences Department, System Administrator
-- Foege Building S048, (206)-685-7354
-- University of Washington School of Medicine


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