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comp.lang.ruby

effective profiling

Giles Bowkett

4/19/2007 7:03:00 AM

I have a friend who's run into some profiling problems. He set up a
profiler on a Rails app, maybe the default benchmarking stuff Rails
comes with, I'm not sure. Unit tests run 60s normally, and come in at
an hour and a half with the profiler going.

That sounds pretty extreme to me. What's the best way to profile a big
app in Ruby? They've got a lot of recursive cloning going on, I think
that's probably the issue, but how do they find out for sure?

--
Giles Bowkett
http://www.gilesg...
http://gilesbowkett.bl...
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2 Answers

Alex Young

4/19/2007 7:24:00 AM

0

Giles Bowkett wrote:
> I have a friend who's run into some profiling problems. He set up a
> profiler on a Rails app, maybe the default benchmarking stuff Rails
> comes with, I'm not sure. Unit tests run 60s normally, and come in at
> an hour and a half with the profiler going.
Is that with profile (rather slow) or ruby-prof (should be much faster)?

--
Alex

M. Edward (Ed) Borasky

4/19/2007 2:37:00 PM

0

Giles Bowkett wrote:
> I have a friend who's run into some profiling problems. He set up a
> profiler on a Rails app, maybe the default benchmarking stuff Rails
> comes with, I'm not sure. Unit tests run 60s normally, and come in at
> an hour and a half with the profiler going.
>
> That sounds pretty extreme to me. What's the best way to profile a big
> app in Ruby? They've got a lot of recursive cloning going on, I think
> that's probably the issue, but how do they find out for sure?
>
Perhaps premature optimization isn't so bad after all. :) Seriously,
though, profiling is a form of testing, and if you're going to do
test-driven development but *not* performance testing, you're finding
only *some* of the bugs. So the best way to profile a big application,
assuming a total absence of software performance engineering during its
construction, would be to break it up into smaller pieces in top-down
fashion.

--
M. Edward (Ed) Borasky, FBG, AB, PTA, PGS, MS, MNLP, NST, ACMC(P)
http://borasky-res...

If God had meant for carrots to be eaten cooked, He would have given rabbits fire.