I'm trying to learn a bit more about dtrace and I thought that using it to add
probes to macruby would be fun.
I pulled up the sample dtrace scripts from the Macruby 0.5 b2 source and was
working with the script:
class World
def say(message)
puts message
end
end
world = World.new
world.say('hello')
(taken from http://redartisan.com/2008/5/18/dtrace-ruby)
I tried to run the trace as:
$ sudo dtrace -s methods_count.d -c "macruby world.rb"
(where methods_count.d is one of the sample dtrace scripts)
This doesn't produce any meaningful results.
After playing around for a bit, I have learned that if I add a bit to the end
of my ruby script:
while(true)
sleep 1
end
What I take from that is if the ruby script runs for a longer time, dtrace has
a chance plugging into the ruby application which it does not have when the
script exits quickly.
Am I doing something the wrong way? Is there a better way to ask dtrace to
attach to my ruby application and catch information?
Scott
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