Re: Profiling Java code running on Sun HotSpot JVM with linux perf

[Maynard Johnson <maynardj@xxxxxxxxxx>]

On 08/31/2011 2:35 AM, Stefan Hajnoczi wrote:
> On Tue, Aug 30, 2011 at 9:03 PM, Geoffrey Blake
> <geoffrey.w.blake@xxxxxxxxx>  wrote:
> > Hi all,
> >
> > I am trying to profile some java server applications using %>perf
> > record -a, and as expected the majority of the execution time of these
> > applications is spent within jit'ed java code.  According to these
> > lists, the jit should be outputting a /tmp/perf-$pid.map file for each
> > thread being jit'ed.  The Sun JIT does not seem to have this output
> > enabled by default.  Does anyone here know what options I need to set
> > on the command line to get the JVM to output the symbol map files from
> > the JIT?
>
> I don't know the answer but if you don't get one here you could check
> the OProfile mailing list.  I believe there was a solution for JIT
> compilers with OProfile and people probably got popular JVMs like
> HotSpot working.  That might reveal what support HotSpot has for doing
> this.
Geoffrey,
I don't know if there's a way to get perf to show you profile information for 
Java class methods, but as Stefan said, you can indeed get this using oprofile. 
 See http://oprofile.sourceforge.net/doc/index.html and read every section with 
"JIT" in the title.

-Maynard

> Stefan
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