Davide Libenzi <dlibenzi@maticad.it> said:
> On Sat, 29 Jan 2000, Horst von Brand wrote:
> > In case your application switches rapidly, it is thrashing the cache, which
> > is crucial for performance with current CPUs. You simply don't want to do
> > that, ever. You get best performance by _never_ switching unless forced to
> > do so, but that isn't realistic.
> If You switch fast You have more cache reloads of probably less cache lines (
> or pages ).
Yep. You don't even get to build up your working set that way. Just cache
misses, no real work done.
> Since a task that run a short time has a lower probability to "touch" RAM
> locations.
It also hasn't got time enough to use the RAM locations it got into cache
for more than a few times.
This obviously depends on the exact behaviour of processes and cache use.
-- Horst von Brand vonbrand@sleipnir.valparaiso.cl Casilla 9G, Viņa del Mar, Chile +56 32 672616- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Jan 31 2000 - 21:00:24 EST