On Tue, Sep 19, 2006 at 04:11:12PM +0400, Dmitry Morozovsky wrote: > On Thu, 14 Sep 2006, Oliver Fromme wrote: > > OF> Because buildworld is I/O-bound on systems with sufficiently > OF> fast processors. > OF> > OF> Try putting the contents of /usr/src into a RAM disk and > OF> repeat the benchmark. The numbers might look a little > OF> different then. Of course, you should have sufficient RAM > OF> in the machines -- If they're going to swap to the disks, > OF> your benchmark won't be happy. > OF> > OF> I think putting /usr/obj onto a RAM disk is _not_ necessary > OF> because of soft-updates, so the processes shouldn't block > OF> on writes. > > My experiments show that if you have enough memory to host radmdrive for > /usr/src you'd better leave it for caching - there were no statistically > meaningful performance difference, at least on machines with 1G+ RAM.
Really? My measurements show the opposite (on a system with 16GB of RAM). Kris
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