On Sun, Nov 09, 2003 at 11:06:07AM +0100, Jaromir Dolecek wrote: 
> I note this there is huge difference in number of page reclaims
> and page faults (other resource usage ~same). Perhaps that          
> affects the performace most?                                               

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> Could this be mmap() vs. read() ? I don't know what GNU grep                 
> and othersrc grep uses for I/O.                    
     
Off the top of my head, othersrc grep uses always tries to use mmap.            
GNU grep will always use read unless you give it --mmap.