[ILUG] 2.6 Kernel + Hyperthreading

[Justin Mason]

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kevin lyda writes:
> On Fri, Sep 10, 2004 at 08:05:21PM +0100, Paul Jakma wrote:
> > On Fri, 10 Sep 2004, John P. Looney wrote:
> > > It'd be cool if you could have a daemon running in the background, 
> > > polling for new releases of GCC, then every time a new compiler 
> > > comes out, it'd re-compile your whole OS in the background, so you 
> > > know you have all the fastest binaries.
> > Actually, what would be cute here is to do the following:
> > - compile everything with profiling enabled, specifically
> >    -fprofile-arcs
> > 
> > - every time after above when you recompile the distro, use the
> >    profile data collected previously for -fbranch-probabilities
> 
> on a serious note are there also options for laying out the binary in
> such a way to minimize page faults?

wasn't someone working on a tool to do this -- GNU rope or something, but
dropped the project due to lack of tuits, and never posted the source?

But I'd be very doubtful of "order of magnitude" speedup claims
anyway.

BTW see also http://kcachegrind.sourceforge.net/cgi-bin/show.cgi .
as far as I know you can valgrind any executable (although you won't
get source symbols without -g compilation.)

> > I'm willing to bet a machine which did the above could potentially be 
> > an order of magnitude faster, and I'd really like to investigate this 
> > - if someone would send me a 4-way Opteron with at least 8GB of RAM 
> > to facilitate research into the above, i'd be very grateful.
> 
> i can send you a pentium 75 with 8 megs of ram.  you'd notice
> performance gains more there.

he's right!   slow machines for the Gentooites!

- --j.
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