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From Shrinivas Joshi <jshrini...@gmail.com>
Subject Re: JIT debug symbols and OProfile under Hadoop
Date Mon, 21 Jun 2010 18:16:34 GMT
Hi All,

I just wanted to check if anybody had a comment on this query.


On Wed, Jun 16, 2010 at 9:50 PM, Shrinivas Joshi <jshrinivas@gmail.com>wrote:

> Sorry if this is repeat email for you, I did send this to common-dev list
> as well.
> Hello,
> I am trying to get profiles for a workload running on top of Hadoop 0.20.2
> framework. The workload jars and Hadoop jars have been compiled with debug
> symbols enabled. I could see local variable tables and line number tables in
> the jar class files using javap. I am passing the right value for *
> agentpath* flag pointing to oprofile JVMTI agent and I am also seeing it
> passed correctly to map and reduce JVMs from *ps *output. This is done
> through conf/mapred-site.xml properties. However, in the profiles I am
> unable to see meaningful samples for JITed code; everything is getting
> attributed to anon samples.
> Profiling a test app works just fine with the same JVM that is being used
> by Hadoop. I can see the right debug symbols being attributed in the
> resulting profiling. In fact, I even tried profiling a JVM process that was
> spawned using *ProcessBuilder* API, the way Hadoop spawns its map and
> reduce JVMs, that seem to work fine too.
> Does anybody have any pointers as to what I might be missing here? Has
> anybody successfully collected profiles showing JIT debug symbols for any
> Hadoop workload? I am using OProfile 0.9.6.
> Thanks,
> -Shrinivas

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