Core + max pool size
Core = always-alive workers. Max = grows to this under load. When queue is unbounded, max never triggers.
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Core + max pool size
Core = always-alive workers. Max = grows to this under load. When queue is unbounded, max never triggers.
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Queue choice matters
LinkedBlockingQueue = unbounded, workers = core. SynchronousQueue = no buffer, direct handoff, workers can grow to max.