On 3/25/19 2:14 PM, Alexander Prokhorov
wrote:
Also keep in mind that if you have any
idle parallel universe jobs in your queue, the
dedicated scheduler is going to try its best to
claim resources for each of those jobs, and those
resources are going to be claimed/idle until the
scheduler is able to claim enough resources for the
job to start.
This strategy is fine for me now. Can I be sure that
deadlock will not happen if there are multiple parallel jobs
are waiting in the queue at the same time?
Each machine that is willing to be scheduled by the parallel
universe declares, via the DedicatedScheduler attribute, the one
schedd it is willing to allow parallel jobs from. Because only
one schedd can run parallel jobs on any given machine, and because
each schedd is single threaded, there is no way to hit deadlock.
There are two phases to scheduling dedicated jobs -- first, the
acquisition of resources, and second, assigning those resources to
job. As the job queue can change between these two phases, it is
possible that the dedicated scheduler can acquire resources for
job A, but before those resources are given to it by the
negotiator, a higher priority job, B, arrives, which will start
before A.
-greg
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