From: Shannon Fang <xrfang@...>
Date: 2002-12-19T09:23:47+09:00
Subject: yet another benchmark

Hi,

Inspired by the benchmark module, I wrote "yet another benchmark". The
benefit of the code:

1. simple :)
2. does not interfere with program output.

Usage:

require "yabm.rb"
bm=Yabm.new
...
bm.log("Task1")
...
bm.log
...
bm.log("Task2")
...
bm.log("Task3")
bm.report

The log method is called after the task has finished. A log call with no
argument will record the start time of a task, otherwise, the start time
of a task is same as the finish time of last task.

yabm.rb:

class Yabm
  def initialize
    @cp=[]
    @cp << [nil,Time.now]
  end
  def log(label=nil)
    @cp << [label,Time.now]
  end
  def report
    total=@cp[@cp.length-1][1]-@cp[0][1]
    caption="Time used: %0.2f sec."%total
    print "\n",caption,"\n"
    print "-"*caption.length,"\n"
    @cp.each_index do |i|
        if @cp[i][0]!=nil then
            elapsed=@cp[i][1]-@cp[i-1][1]
            printf "%s: %0.2f sec. (%0.2f%%)\n", @cp[i][0],elapsed,elapsed/total*100
        end
    end
  end
end

A moron question: what is the meaning of "user time" and "system time"?
Is it useful when doing benchmarking?

Thanks...
Shannon