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subprocesses are not cheap

This statement depends heavily on the runtime environment. Consider either Erlang or fibers as implemented in C/C++, for example.

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We usually only refer to OS-level processes as "subprocesses". You'll see terms like "lightweight threads", "greenlets", "fibers" for concurrency units managed by the application runtime instead.

Exactly what I meant -- thanks... Are you the erjiang that wrote the blog post? If so, thanks, I thoroughly enjoyed it

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