The scheduling loop in schedule() and findRunnable() drives it all — checking the local queue, the global queue for fairness every 61 ticks, the netpoller, and stealing from other Ps before giving up. Spinning threads keep the system responsive by staying awake briefly to catch new work, and context switching between goroutines costs only about 50–100 nanoseconds thanks to the small amount of state involved.
Number of threads to use
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actually matters.