RES: /usr/lib vs /usr/libexec

[Humberto Massa Guimarães <humberto.massa@almg.gov.br>]

Josselin:
> Le jeudi 12 mai 2005 à 18:32 -0700, Thomas Bushnell BSG a écrit :
> > > You said it: there is a cache. After the first access, the directory
> > > will be in the cache. Making all of this a purely imaginary problem.
> > 
> > The whole directory is in the cache?  I don't think so.  Remember,
> > that in between each lookup, a library gets searched, which probably
> > flushes the entire cache.
> 
> Currently, on my 256 MB machine, the kernel is using 60 MB for the
> cache. I think this is enough to include a few directory blocks,
> especially some as frequently used as /usr/lib.

You said it yourself. Even if your 256MB machine were typical (it's not), the less cache memory you use to cache dentries of /usr/lib, the better (more memory for your apps, or to cache other, more useful stuff).