Compiling Ruby w/ Profile Guided Optimization

ruby-talk
1

<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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···

-----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

2

On OS X Ruby can fail when compiled with -fschedule-insns2 which is in -O2.

···

On May 15, 2006, at 9:20 AM, Berger, Daniel wrote:

-----Original Message-----
From: Greg Buchholz [mailto:sleepingsquirrel@yahoo.com]
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?

--
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
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