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I believe even NodeJS's libuv came to the same unfortunate conclusion for non windows hosts.

https://github.com/joyent/libuv http://nikhilm.github.com/uvbook/filesystem.html

When node switched to libuv it didn't degrade io performance on unix hosts; io in threads has been competitive with evented io. I don't think async io was even considered, but let me know if you dig up anything.

yep, node has always used a threadpool for filesystem calls, even before libuv.

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