From: Felix Windt <fwmailinglists@...>
Date: 2007-09-24T09:57:49+09:00
Subject: Re: How fast does your Ruby run?

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> -----Original Message-----
> From: M. Edward (Ed) Borasky [mailto:znmeb@cesmail.net] 
> Sent: Sunday, September 23, 2007 5:32 PM
> To: ruby-talk ML
> Subject: Re: How fast does your Ruby run?
> 
> Lloyd Linklater wrote:
> > SpringFlowers AutumnMoon wrote:
> >> The performance gain I got from Ruby 1.8.6 to Ruby 1.9 is 
> only from 
> >> about 52,000 iterations per second to 58,000... I wonder why other 
> >> people get so big performance gain instead.  is it because 
> they compile 
> >> their only Ruby 1.9.
> > 
> > If that is true, then is the release version specifically 
> compiled to be 
> > slow?  Which compiler is the best and which settings to use 
> for a "roll 
> > your own" ruby for windows?  Unix?
> > 
> 
> As far as I've been able to determine, with gcc, the compiler settings
> should be "-O3 -march=<architecture>", where <architecture> 
> is the chip
> name, for example "-O3 -march=athlon64". There doesn't seem to be much
> gain from going from O2 to O3, but it's non-zero. The tests 
> I've looked
> at indicate that it's the "-march" piece that does the real job.
> Incidentally, I saw a post go by somewhere that had "-march= -mcpu=
> -mtune=" flags all set. The only one you want is "-march" -- 
> the others
> are redundant or ignored or both.
> 
> See http://www.jhaampe.org/software/ruby-gcc for the details.
> 
> I can't help you with the Microsoft or other Windows compilers. Cygwin
> or MSYS/MinGW compiling, on the other hand, should work the 
> same way as
> Linux -- you've got gcc, so use "-march=" and "-O3".
> 


Just for the hell of it, on a Core 2 Duo @ 2GhZ:


Vanilla Ubuntu Ruby from repositories
$ ruby test.rb
Ruby 1.8.5 on i486-linux
It took 20.8315 seconds to run. 48004 iterations per second.


Standard compiled from source (no compiler flags)
$ ./ruby1.8.6/bin/ruby test.rb
Ruby 1.8.6 on i686-linux
It took 7.015534 seconds to run. 142540 iterations per second.


Optimized compiled from source (CFLAGS="-O3 -march=nocona")
$ ./ruby1.8.6opt/bin/ruby test.rb
Ruby 1.8.6 on i686-linux
It took 6.543835 seconds to run. 152815 iterations per second.


Vanilla Ubuntu Ruby 1.9 from repositories
$ ruby1.9 test.rb
Ruby 1.9.0 on i486-linux
It took 24.726563 seconds to run. 40442 iterations per second.


Standard 1.9 compiled from source (no compiler flags)
$ ./ruby1.9/bin/ruby test.rb
Ruby 1.9.0 on i686-linux
It took 2.627064 seconds to run. 380653 iterations per second.


Optimized 1.9 compiled from source (CFLAGS="-O3 -march=nocona")
felix@felix-laptop:~$ ./ruby1.9opt/bin/ruby test.rb
Ruby 1.9.0 on i686-linux
It took 2.593149 seconds to run. 385631 iterations per second.


Felix

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