Re: Linux 2.4.2 fails to merge mmap areas, 700% slowdown.

[Mike Galbraith]

On Wed, 21 Mar 2001, Kurt Garloff wrote:

> On Wed, Mar 21, 2001 at 07:41:55AM +0100, Mike Galbraith wrote:
> > On 20 Mar 2001, Kevin Buhr wrote:
> > >     real    60m4.574s
> > >     user    101m18.260s  <-- impossible no?
> > >     sys     3m23.520s
> >
> > Why do numbers like this show up?  I noticed some of this after having
> > enabled SMP on my UP box.
>
> As you have two CPUs, you can spend more time in CPU than your wall clock
> shows if you time multithreaded processes or multiple processes. At most
> (ideal case) twice as much.

Yes.  I'm so used to UP numbers I didn't think.  I saw user larger than
real on my UP box yesterday during some testing, and then seeing this
post... oops.

        -Mike

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