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> I routinely wrote apps using 10,000+ threads before.

Running on how many CPU cores? Were you writing code for a supercomputing cluster? Otherwise for what kind of system could 10,000 threads possibly be an ok strategy?

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Bunch of natively 256-thread CPUs, distributed enterprise messaging system (TIBCO-style) in Java (before NIO). It was normal to have 60,000 threads/machine, just debugging was a bit weird. Whole London, Frankfurt and NYC trading was running on the same or similar systems.

Can't wait for 64-core Threadripper to have something similar at home in a little box ;-)

It can work because when sleeping the only cost is literally the size of the stack (that you can set to a low value).

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