Re: Dynamically allocated locks

[Jason Thorpe <thorpej%shagadelic.org@localhost>]

On Mar 24, 2008, at 10:10 AM, Matt Thomas wrote:

> Yes.  One / cacheline size is a dramatic waste of space.  Some  
> systems have
> 128 bytes per cacheline.  On systems with small caches or UP systems  
> it's
> extremely expensive.

Two independent locks in a single cache line is guaranteed to crease a  
false-sharing situation.  It is best avoided, even if cache pressure  
is the trade-off.

-- thorpej