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by ibraheemdev
1479 days ago
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> More precisely, OS threads, because of their scarcity, introduce an artificial bound on throughput that's lower than what the hardware can support, and usermode threads remove that bound. Why are OS threads scarce? The OS allocates thread stacks lazily. Given a kernel stack of ~8kb (two pages) and a user stack of ~4kb, one could spawn 100k threads with just over 1GB. A userspace runtime will allow you to bring that number down, but if you're at the scale of concurrency it is unlikely to matter much. |
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