From: Tim Bates <tim@...>
Date: 2003-04-16T12:50:55+09:00
Subject: profile.rb overhead

I have a script.

tim@zaphod:~/ruby$ ruby -v
ruby 1.6.7 (2002-03-19) [i386-linux]
tim@zaphod:~/ruby$ time ruby test1.rb

real    0m22.490s
user    0m20.010s
sys     0m0.340s

So far, so good.
But when I try to profile this script, it runs for ages:

tim@zaphod:~/ruby$ time ruby -r profile test1.rb
  %   cumulative   self              self     total
 time   seconds   seconds    calls  ms/call  ms/call  name
 39.60   395.46    395.46    77090     5.13    17.16  Array#each
...

real    18m37.780s
user    16m38.740s
sys     0m6.580s

Now I realise that the profiler must have some overhead, but this is 
ridiculous - it's taking 50 times longer! I've run similar scripts through 
the profiler before, and I've never seen an increase like this. Any ideas?

Tim Bates
-- 
tim@bates.id.au