From: Michael Husmann <Michael.Husmann@...>
Date: 2001-08-24T17:11:08+09:00
Subject: [ruby-talk:20259] Re: File.readline(s)

Yukihiro Matsumoto wrote:

> Hi,
>
> In message "[ruby-talk:20254] File.readline(s)"
>     on 01/08/24, Michael Husmann <michael.husmann@teleatlas.com> writes:
>
> |I am reading a 55MB ASCII file  by using File.readline(s) which takes on
> |my machine about 22s. The same runs in Python using readlines(0x2000) in
> |about 9 seconds. Does anybody know whether there is a chance to speed
> |things up in Ruby by reading chunks like in Python.
>
> There must be some bottleneck left, probably due to my stupidity.
> Could you show me your slow Ruby code, and fast Python code?
>
>                                                         matz.

Hi Matz,

this is the code in Python:

def read_blocks(name):
    lines = None
    line = ""
    n = 0
    f = open(name)
    while 1:
        lines = f.readlines(0x2000)
        if not lines: break
        for line in lines:
            n += 1
    return n


and this in Ruby:

def read_f(name)
    n = 0
    line = ""
    f = File.open(name)
    f.each_line{|line|
        n += 1
    }
    n
end


regards,
Michael