numbers don't lie ...

[Kris Kennaway]

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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