From: Josip Gracin <gracin@...>
Date: 2007-09-22T14:45:03+09:00
Subject: Re: How fast does your Ruby run?

Eric Hodel wrote:
> On Sep 21, 2007, at 02:20, Josip Gracin wrote:
>> 3. With ruby 1.8.6 compiled from sources on the machine:
>>
>>    Ruby 1.8.6 on i686-linux
>>    It took 7.107875 seconds to run. 140689 iterations per
>>    second.
>>
>>
>> Obviously, the target instruction set matters quite a lot.  I think 
>> I'll be compiling my own ruby from now on. :-)
> 
> How can you draw that conclusion?  You used three different versions of 
> ruby.

You are right, that was one hasty conclusion.

Here are the real results, indicating how ruby was compiled:

1. CFLAGS="-O3 -mcpu=i686 -march=i686 -mtune=i686" ./configure
    --target=i686-linux

    Ruby 1.8.5 on i686-linux
    It took 6.561333 seconds to run. 152408 iterations per
    second.


2. CFLAGS="-O3 -mcpu=i486 -march=i486 -mtune=i486" ./configure
    --target=i486-linux

    Ruby 1.8.5 on i486-linux
    It took 6.847393 seconds to run. 146040 iterations per
    second.


3. CFLAGS="-O3 -mcpu=i686 -march=i686 -mtune=i686" ./configure 
--target=i686-linux --enable-pthread

    Ruby 1.8.5 on i686-linux
    It took 17.856484 seconds to run. 56002 iterations per
    second.


Note the "--enable-pthread" in the last measurement.  The binary 
distributed with Ubuntu is compiled with pthreads.