CMPXCHG latency

By: Gabriele Svelto (gabriele.svelto.delete@this.gmail.com), March 31, 2008 2:08 am
Room: Moderated Discussions
Michael S (already5chosen@yahoo.com) on 3/31/08 wrote:
---------------------------
>With fine-grained locking - I agree. But too fine-grained locking is probably a
>bad idea for other reason. Besides, how would you apply a fine-grain locking to
>something like [modifiable] balanced binary tree?

Very good point, in the end you need as little contention as possible *and* having the same thread grabbing the same locks as often as possible. Hitting both nails at the same time isn't easy though as the core count increase it's either that or we'll feel Amdahl's wrath.

Gabriele
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