Question
I'd like to profile my JRuby app. For MRI I always use ruby-prof, but I don't think this works on JRuby. I don't want to use a Java-profiler, because it won't give me the ruby line numbers.
Is there a jruby-prof?
Solution
JRuby 1.5.5 includes a decent --profile command line flag.
Use it like this:
jruby --profile -S <script> <args>
OTHER TIPS
Check out Daniel Lucraft's new jruby-prof
We have never received a request for line numbers because that is typically only ever used when performing call stack sampling but I would see whether we can turn this on as an option. But for the most part you will not have to work because our automatic hotspot detection and extensible metering solutions would find the issue whether in the ruby code or the jruby implementation.