On Wed, 20 Sep 2006, Eric Anderson wrote: EA> > > > My experiments show that if you have enough memory to host radmdrive EA> > for > /usr/src you'd better leave it for caching - there were no EA> > statistically EA> > > meaningful performance difference, at least on machines with 1G+ RAM. EA> > EA> > That might only be true if you have enough RAM to keep EA> > _all_ buildworld files (src, obj, toolchain) in the cache EA> > _and_ you pre-read all of /usr/src before actually starting EA> > the buildworld, so it is in the cache. If you don't have EA> > that much RAM, but enough to store /usr/src, then using EA> > a RAM disk for it is a win. EA> > EA> > Reading /usr/src from a physical disk certainly requires EA> > quite some I/O that takes more than zero time. EA> EA> But, in order to populate the ram disk, you must read /usr/src also from EA> something, and that also takes time, which you should include in the full EA> scope.
... and that populates cache with src files as well ;-) Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- [EMAIL PROTECTED] *** ------------------------------------------------------------------------ _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
