[Condor-users] Order of selection of machines in condor pool

[Steven Timm <timm@xxxxxxxx>]

I recently added 40 fast nodes to my pool of what had been just 14
slow nodes.  The 40 fast nodes seem to be working OK. However,
when the pool is mostly idle, it seems like it is very often the
slow nodes that match first.  for example, there are 16 jobs
running at the moment and all but one of them have matched on the slow
nodes that were in the pool at first.

So what is the scheduling algorithm that is being used?  As far
as I know any node in the pool would meet the requirements of
these jobs equally well.   I verified by submitting 100 jobs that
all the nodes are in fact able to accept and run jobs.  It's obviously
not a round-robin scheduler.  What would make the bias?

Steve Timm


--
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Steven C. Timm, Ph.D  (630) 840-8525  timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Div/Core Support Services Dept./Scientific Computing Section
Assistant Group Leader, Farms and Clustered Systems Group
Lead of Computing Farms Team