Re: Compiling Ruby w/ Profile Guided Optimization


#1

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

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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#2

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

YMMV. I compiled a version of Ruby-1.8.4 using the
following config options…

configure CFLAGS="-O3 -fprofile-generate"

LDFLAGS=-fprofile-generate

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

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


Eric H. - removed_email_address@domain.invalid - http://blog.segment7.net
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