alkis opened a new pull request, #40464:
URL: https://github.com/apache/spark/pull/40464

   ### What changes were proposed in this pull request?
   Scheduler micro optimizations to speed up the scheduling loop.
   
   ### Why are the changes needed?
   The scheduler is single threaded and the faster we can schedule the faster a 
query executes. Changes to the scheduler usually adversely affect scheduling 
throughput which makes it hard to prototype novel changes. Getting some 
headroom makes experimentation faster while not hurting production.
   
   
   ### Does this PR introduce _any_ user-facing change?
   No.
   
   ### How was this patch tested?
   Existing tests.
   


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