From: Robert Feldt <feldt@...>
Date: 2003-04-16T19:06:49+09:00
Subject: Re: profile.rb overhead

On Wed, 16 Apr 2003, Tim Bates wrote:

> 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?
>
thats typical since it installs a trace proc which is invoked for each
source code line.

rbprof might be what you need but it hasn't been updated in ages... Check
RAA.

/Robert Feldt