Friday May 29, 2009

Instruction selection for volatile fences : MFENCE vs LOCK:ADD

In the past the JVM has used MFENCE but, because of latency issues on AMD processors and potential pipeline issues on modern Intel processors it appears that a LOCK:ADD of 0 to the top of stack is preferable (Gory Details).

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Dave is a senior research scientist in the Scalable Synchronization Research Group within Oracle Labs : Google Scholar.

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