Re: P4 optimized Debian GNU/Linux?
Nano Nano wrote:
> > When I run the program with no optimization -O0, I got some numbers that
> > looked about the same for both machines. Then I compiled with
> > -march=pentium-4 and -march=athlon-xp and -O6, and surprise, surprise,
> > the P4 had a speed *decrease*!! It slowed down from something like 23
> I did enough performance work at Microsoft to know that your test is
> meaningless. Just because you know X at level Y doesn't imply a thing
> about your knowledge at level 10Y, good or bad. The program might get
> slower, or faster, or crash.
> Some people call this "nonlinear." A perf expert described it to me as
> more accurately: stochastic.
> So you can draw no conclusions whatsoever from your test.
The conclusion is: Switching on all the optimizations is no silver bullet.