From: Vivek Vaid <vivek.vaid@...>
Date: 2011-04-01T06:01:01+09:00
Subject: Monitoring

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Charles - Any insights into jxinsight vs new relic?

<snip>
Another option would be the JXInsight tool
(http://www.jinspired.com/products/jxinsight/), which has builtin
support for profiling Ruby (and may make it possible to combine Ruby
and Java results in the same output. It is, however, a commercial
tool.
<snip>


On Sat, Dec 4, 2010 at 7:26 PM, Charles Oliver Nutter
<headius@headius.com>wrote:

> On Fri, Nov 19, 2010 at 5:56 PM, Joel VanderWerf
> <joelvanderwerf@gmail.com> wrote:
> > I'm looking at the output from both --profile and --sample. It seems th=
at
> > --profile measures only jruby methods, and --sample measures only java
> > functions. (Or maybe --sample would show some of the jruby methods if
> they
> > were taking enough time to be observed at a tick. My program is much mo=
re
> > heavily bottlenecked in the java side at the moment.)
> >
> > Is there any possibility of --profile instrumenting both jruby and java
> > code?
>
> Currently, no. Because Ruby dispatches differently than Java,
> including both in the same profile is at least difficult, and maybe
> impossible. Liken it to wanting to show profile results for both Ruby
> and C (or C++, C#, ObjC) in other implementations, when Ruby method
> dispatch is actually implemented *in* those native languages. The two
> worlds are largely separate.
>
> However...
>
> If you are able to force all Ruby code to compile before invocation
> (using -X+C to force all files to compile or -Xjit.threshold=3D1 to
> force all methods to compile on first invocation) normal Java
> profiling tools will show the compiled Ruby method bodies alongside
> regular Java method bodies. Be forewarned, however...as with any C or
> C++-based implementation that JITs Ruby code to native code, the
> resulting method are "mangled" a bit, and you'll have to do some
> manual chewing to interpret them. But at least you can use any of the
> dozens of Java profiling tools and show results for both Ruby and Java
> at the same time. If there's interest, I could try to do a screencast
> of how to do this with various JVM profilers (such as the built-in
> -J-Xrunhprof:cpu=3Dtimes):
>
> =E2=9E=94 jruby -J-Xrunhprof:cpu=3Dtimes -e "def foo; a =3D 0; while a < =
1000; a
> +=3D 1; end; end; 100.times { foo }"
> Dumping CPU usage by timing methods ... done.
>
> Result, buried in a java.hprof.txt file: https://gist.github.com/728666
>
> Here, the "ruby.__dash_e__.method__0$RUBY$foo" method is the jitted
> version of the "foo" method defined above.
>
> Now, on JRuby 1.6, it may be possible to take this mangled output and
> at least do a cleanup pass (because we have standardized the mangling
> a bit better), but the profiling output is very tool-specific...so
> de-mangling would have to happen on a per-tool basis
>
> Another option would be the JXInsight tool
> (http://www.jinspired.com/products/jxinsight/), which has builtin
> support for profiling Ruby (and may make it possible to combine Ruby
> and Java results in the same output. It is, however, a commercial
> tool.
>
> - Charlie
>
>

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