How do you view a sample of the call stack in ruby?

ruby-on-rails ruby optimization profiling
Jeremy Smith picture Jeremy Smith · Jun 12, 2011 · Viewed 22.3k times · Source

I'm investigating different optimization techniques, and I came across this post Analyzing Code for Efficiency? by someone who believes that sampling the call stack is more effective than using a profiler. The basic idea is that if you take a view of the call stack, you see where your application is most likely to be spending most of its time, and then optimize there.

It is certainly interesting, and he is obviously an expert on this, but I don't know how to view the call stack in ruby. In debugger I can say "info stack" but only seems to show one line.

EDIT: I saw this comment by Mike Dunlavey: "I would just like to point out that if you run under the debugger, interrupt it manually, and display the call stack..."

I'm just not sure how to interrupt it manually and dipslay the call stack.

Answer

sawa picture sawa · Jun 12, 2011

Just put

puts caller

anywhere in the code. If you don't like its format, it's an array of strings, so you can do some regex manipulation for a desired output.

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