From: Maran Chandrasekar <maran.asterisk@...>
Date: 2009-02-13T16:19:33+09:00
Subject: Re: performance tips

Joel VanderWerf wrote:
> Vince Forgetta wrote:
>> Hi all,
>> 
>> I've been using ruby for about 2 years, but only recently got around trying
>> and learning it well.
>> 
>> Is there some central repository I can get performance tips/discussions such
>> as the one posted here:
>> 
>> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/158212
> 
> Instead of:
> 
> lines = File.readlines('sometextfile').each {|l| l.chomp!}

require 'benchmark'
include Benchmark

bm(7){|test|
        test.report('report : '){
                lines = File.readlines('LOG/development.log').each {|l| 
l.chomp!}
        }
}

Output:
         user     system      total        real
report :   0.090000   0.030000   0.120000 (  0.117250)

Actually 'development.log' file 6MB size

> do this:
> 
> lines = File.open "test" do |f|
>    f.map {|line| line.chomp}
>end


require 'benchmark'
include Benchmark
bm(7){|test|
        test.report('report : '){
                lines = File.open "LOG/development.log" do |f|
                f.map {|line| line.chomp}
                end
        }
}
Output :
 user     system      total        real
report :      0.240000   0.040000   0.280000 (  0.272991)

which is better?
> 
>
> That saves you from having the large string returned by #readlines.
> 
> Sorry, no idea if these tips are collected somewhere. The rubygarden
> wiki used to have them, IIRC, but it got killed by spam.


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