Speed up Parallel::Scheduler#quick_dequeue? for max=1
#15961
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straight-shoota
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Parallel::scheduler# quick_dequeue? when max=1Parallel::Scheduler#quick_dequeue? for max=1
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Brings an optimization from the
Concurrentcontext to theParallelcontext when the parallelism is set to 1: we can spare a switch to the scheduler's run loop fiber to (not so) quickly check the global queue and event loop.With this, there's no noticeable speed difference between
ConcurrentandParallelwith a single scheduler in a few benchmarks, such as a swarm of fibers or a HTTP server.Built on top of #15936.