[jboss-as7-dev] AS 7 profiling output while running under load

[Andrig Miller]

One of the things to note, is that the CPU percentages seem very small.  Having said that, its actually counting each CPU cycle available on the entire system.  On my test system I have 16 virtual cores, so 1600% would be 100% CPU utilization.

So, a small percentage, like 1 or 2% is actually quite a bit of CPU cycles.

Andy

----- Original Message -----
> From: "Scott Marlow" <smarlow at redhat.com>
> To: jboss-as7-dev at lists.jboss.org
> Sent: Saturday, May 21, 2011 11:38:30 AM
> Subject: [jboss-as7-dev] AS 7 profiling output while running under load
> 
> You probably saw Andy Miller's notes, explaining how to profile AS7
> with
> the oprofile tool on Fedora
> (http://community.jboss.org/wiki/ProfilingAS7UsingOProfileOnFedora).
> 
> http://pastebin.com/ewvCdC48 contains output from a performance test.
>  I
> wanted to share this with everyone, as its interesting to see how
> much
> CPU is used by various parts of our codebase.  Take the information
> with
> a grain of salt, as its not that meaningful by itself.
> 
> This could probably be combined with a traditional profiler (which
> would
> show the reason why something was called thousands of times).  But at
> least this gives you an idea of which code to focus on.
> 
> I'm still trying to understand what some of the oprofile details mean
> exactly as well.
> 
> Scott
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