Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/8178#issuecomment-130865078
I noticed this while running a very simple scheduling throughput benchmark
under YourKit Java profiler with CPU tracing enabled. Here's a comparison of
two trace results, clearly illustrating the slowdown:
For scheduling a job with 10000 no-op tasks, (`sc.makeRDD(1 to NUM_TASKS,
NUM_TASKS).mapPartitions(identity).count()`), the end-to-end time in `local[*]`
mode dropped from ~48 seconds to ~20 seconds as a result of this change.
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