new SUPER FUN blog post about threads, friends! Diving into concurrency: trying out mutexes and atomics http://jvns.ca/blog/2014/12/14/fun-with-threads/ …
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@bork The lock prevents later instructions from executing until the lock is retired, which makes the next instruction seem SUPER SLOW
@bork Since it's just sitting in a queue idling from when it's issued until the locked instruction retires it counts as taking a lot of time
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@danluu ah ha that explains everything! I feel like you explained this to me before already -
@b0rk BTW, this really nice blog post goes into more detail on when perf produces misleading numbers: http://www.pvk.ca/Blog/2014/10/19/performance-optimisation-~-writing-an-essay/ … - 4 more replies
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