On Mon, Mar 17, 2003 at 06:04:21PM +0200, Jerome BENOIT wrote: > > > David Z Maze wrote: > >Jerome BENOIT <jgmbenoit@wanadoo.fr> writes: > > > > > >>I have a very naive question: > >>Can Debian tune the GNU C Compiler ? > >> > >>[e.g., put `-cpu=pentium' automaticly on Pentium box] > > > > > >There's a pentium-builder package that tries to do this, or you can > >try to set CFLAGS for the program in question. With a limited number > >of exceptions, though, conventional wisdom is that this buys you > >little in performance at the cost of portability of binaries to other > >x86-based machines. > > To be frank, the question arised when I read in gsl-1.3/INSTALL: > > >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> > Hints for Intel (Pentium) > ======================== > > For the Pentium 4 with GCC-3.2 the flags, > > CFLAGS="-O2 -march=pentium4 -mfpmath=sse -msse2" > > increase performance by 33% (reported by Sam Halliday <fommil@yahoo.ie>) > <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< > > Since I use my Deabian box mainly to make numerical computations, > I begin to think about these exceptions Ah, fair enough. Scientific libraries and crypto (OpenSSL apparently gets a HUGE speed boost one some sparc CPU when compiled with processor specific optimisations) are the expcetion to the rule. Generally, though, it doesn't gain you much :-) -- Rob Weir <rweir@ertius.org> http://ertius.org/
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