From: Peter Giacomo Lombardo <lists@...>
Date: 2013-07-17T02:40:50+09:00
Subject: Kernel.caller Performance Across Different Ruby Versions

I wrote a quick Ruby script to benchmark Kernel.caller using ruby-prof.
I then ran that script manually across 3 Ruby versions.

The results indicate that Kernel.caller is incrementally slower in newer
Ruby versions.

This seems counter-intuitive to me so what am I missing?  Is there
something wrong in the way I'm benchmarking Kernel.caller or the test
script itself?

The test script with ruby-prof output is available here:
https://gist.github.com/pglombardo/5978849

A couple notes:

* For each Ruby version, I ran the test suite 5 times and pasted the
fastest output in the gist (based on total time)
* Ruby versions were standard "out of the box" as installed by rbenv
* The three Ruby versions were: 1.8.7-p374, 1.9.3-p448, 2.0.0-p247

Test Summary:

Kernel.caller Total Times across Ruby Versions
(Each test makes 500 Kernel.caller calls with 1508 frames)

Ruby 1.8.7-p374: 0.369ms
Ruby 1.9.3p448 : 0.462ms
Ruby 2.0.0-p247: 0.769ms

Any input/guidance would be appreciated.  Thanks!
Peter Giacomo Lombardo

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