From: Greg Buchholz <sleepingsquirrel@...>
Date: 2006-05-16T01:14:49+09:00
Subject: Compiling Ruby w/ Profile Guided Optimization


    Since gcc-4.1 now has the option to perform profile guided
optimization, I thought I'd try compiling a version of Ruby with this
feature turned on.  For the (somewhat contrived/synthetic) scenario
below, it looks like compiling with profile guided optimization turned
on, along with -O3, results in about a 9% speed increase vs. -O3 alone.
  YMMV.  I compiled a version of Ruby-1.8.4 using the following config
options...

    configure CFLAGS="-O3 -fprofile-generate" LDFLAGS=-fprofile-generate

...Then I ran the short version of the n-body program from the Great
Computer Language Shootout with n=1000...

http://shootout.alioth.debian.org/debian/benchmark.php?test=nbody&lan...

...this generated the profile information needed for the next stage.  I
then compiled a Ruby with...

    configure CFLAGS="-O3 -fprofile-use"

...Running the resulting interpreter runs the exact same n-body program
about 8-10% faster than an compiling with just -O3.

FWIW,

Greg Buchholz 

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com