From: "Berger, Daniel" <Daniel.Berger@...>
Date: 2006-05-16T01:20:53+09:00
Subject: Re: Compiling Ruby w/ Profile Guided Optimization

> -----Original Message-----
> From: Greg Buchholz [mailto:sleepingsquirrel@yahoo.com] 
> Sent: Monday, May 15, 2006 10:15 AM
> To: ruby-talk ML
> 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

<snip>

Odd, I thought Ruby died a horrible death if compiled with -O3.  Has
that changed with gcc 4.x?

Thanks,

Dan


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