Tuesday, November 08, 2011

Martin Thompson on lock cost

Anything Martin Thompson says about performance is usually worth a good study. No exception is Locks & Condition Variables - Latency Impact.

His takeaway points:
  1. The one-way latency to signal a change is pretty much the same as what is considered current state of the art for network hops between nodes via a switch.
  2. The impact is clear when letting the OS choose what CPUs the threads get scheduled on rather than pinning them manually.
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