On 21 Mar 2001, Kevin Buhr wrote:
> Mike Galbraith <mikeg@wen-online.de> writes:
> >
> > 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.
>
> Okay, so you see "user > real" on a UP box running an SMP kernel.
On ac20 I see this (has rw_mmap_sem patch in place tho..), but not on
2.4.3-pre6 with Linus' deadlock fix.
[snip nice explanation.. thanks] box is genuine UP btw.
> In any event, if the discrepancy is large: if user, for a
> single-threaded process, exceeds the real time by more than 1% (or a
> few hundredths of a second, whichever is greater) on any system, I
> think this indicates a serious problem.
Let me check virgin ac20 and see what it does.
2.4.2.ac20.virgin 2.4.3-pre6
real 11m0.708s 11m58.617s
user 15m8.720s 7m29.970s
sys 1m31.410s 0m41.590s
It looks like ac20 is doing some double accounting.
-Mike
(fwiw, the smp/up numbers suck rocks compared to up/up)
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This archive was generated by hypermail 2b29 : Fri Mar 23 2001 - 21:00:16 EST