| Date | Sun, 23 Feb 2003 23:22:30 -0700 | From | Val Henson <> | Subject | Re: Minutes from Feb 21 LSE Call |
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On Sun, Feb 23, 2003 at 06:57:09PM -0500, Bill Davidsen wrote: > On Sat, 22 Feb 2003, Larry McVoy wrote: > > > > But that's a false promise because by definition, fine grained threading > > adds more bus traffic. It's kind of hard to not have that happen, the > > caches have to stay coherent somehow. > > Clearly. And things which require more locking will pay some penalty for > this. But a quick scan of this list on keyword "lockless' will show that > people are thinking about this.
Lockless algorithms still generate bus traffic when you do the atomic compare-and-swap or load-linked or whatever hardware instruction you use to implement your lockless algorithm. Caches still have to stay coherent, lock or no lock.
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