From: Brian Candler <B.Candler@...>
Date: 2003-04-08T07:04:25+09:00
Subject: Re: Newbie question:read file speed

On Tue, Apr 08, 2003 at 06:32:29AM +0900, Daniel Berger wrote:
> Does running your code through the profiler provide any insight?

Not greatly:

$ ruby -rprofile x.rb /usr/share/dict/words 
Elapsed = 166.156065
  %   cumulative   self              self     total
 time   seconds   seconds    calls  ms/call  ms/call  name
 66.76    93.20     93.20        1 93203.12 139601.56  IO#each_line
 33.23   139.60     46.40   235881     0.20     0.20  Fixnum#+
  0.00   139.60      0.00        1     0.00     0.00  Float#to_s
  0.00   139.60      0.00        1     0.00     0.00  Array#[]
  0.00   139.60      0.00        2     0.00     0.00  IO#write
  0.00   139.60      0.00        1     0.00     0.00  Kernel.puts
  0.00   139.60      0.00        1     0.00 139617.19  #toplevel
  0.00   139.60      0.00        2     0.00     0.00  Time#now
  0.00   139.60      0.00        1     0.00     0.00  Float#-
  0.00   139.60      0.00        1     0.00     0.00  File#open
  0.00   139.60      0.00        2     0.00     0.00  Time#to_f
  0.00   139.60      0.00        1     0.00     0.00  String#+

I can't do Perl without some serious work:

===>  Configuring for p5-Devel-Profiler-0.04
Perl 5.006 required--this is only version 5.00503, stopped at ./Makefile.PL line 4.
BEGIN failed--compilation aborted at ./Makefile.PL line 4.
*** Error code 255

However I suspect it would say the same: that it spends most of its time
running a fetch-next-line loop, and a bit of time adding one to a counter
:-) What it really needs is a C profiler.

Regards,

Brian.