From: Mark Probert <probertm@...>
Date: 2005-03-01T05:17:03+09:00
Subject: catting files


Hi ..

There is approximately an order of magnitude difference in the performance of 
these two snippets.  Is there a faster way of doing the pure Ruby version?


### use the system call 'cat'
def sys_cat
    of = "plato.txt.cat"
    clean(of)
    l = `cat Plato/*.txt > #{of}`
end


### open each file and copy it
def rby_cat
    of = "plato.txt.rby"
    clean(of)
    off = File.new(of, "w+")
    Dir["Plato/*.txt"].each do |f|
        text = IO.readlines(f)
        off.puts text
    end
    off.close
end

                user     system      total        real
sys_cat     0.000000   0.015625   0.117188 (  0.167577)
rby_cat     0.937500   0.085938   1.023438 (  1.064247)


Thanks,

-- 
-mark.  (probertm at acm dot org)