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That is part of the problem; if you have 4 cores, your program should be using 4 OS-threads. Your programming language's runtime should take care of distributing your 4000 lightweight/green threads to the 4 actual threads.

This is what e.g. Haskell does, and Go as well, I think.

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> This is what e.g. Haskell does, and Go as well, I think.

This is what Erlang does by default, GHC >= 6.12 will do it when using `+RTS -N -RTS` and Go requires explicitly setting GOMAXPROCS, the runtime defaults to single-threaded (as far as I know, GOMAXPROCS still hasn't been retired) and there is no way to have it auto-detect the core count.

The current weekly release has (and Go v1 will have) runtime.NumCPU() so you can do runtime.GOMAXPROCS(runtime.NumCPU())

Is that the default? If not, why not?

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