Subj : Re: What is the real costs of LOCK on x86 multiprocesor machine?
To   : comp.programming.threads
From : Mirek Fidler
Date : Sat Jul 30 2005 05:51 pm

> In practice, the actual amortized cost appears to be much lower than
> 50-100x. I see a 4x difference on shared_ptr_timing_test (which
> basically tests reference count increments and decrements in a somewhat
> real-life worst case scenario.)

Have you tested on real MP machine? (4x is close to what I have measured 
on my SP).

Mirek

.