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Subj : What is the real costs of LOCK on x86 multiprocesor machine?
To   : comp.programming.threads
From : Mirek Fidler
Date : Fri Jul 29 2005 04:54 pm

I am unable to find anwswer to above question. Only tidbit of 
information was that it is 100 cycles on P4, but perhaps that was just 
the worst case.

Measuring the same on my uniprocesor AMD64 machine, LOCKed instructin 
seem to be 3 times slower than regular one, but I guess that has only a 
little relevance on real MP machine.

Mirek

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