Tools for analysing -XX:+LogCompilation output
ben.evans at db.com
Fri Nov 13 05:30:46 PST 2009
This looks to be a great basis for what we need - I'll give it a proper
run through its paces and report back (probably after Devoxx now).
eFX Algorithmic Trading
Deutsche Bank, London
Office: +44 (0)20 7541 3953
Tom Rodriguez <Thomas.Rodriguez at Sun.COM>
Sent by: Thomas.Rodriguez at Sun.COM
Ben Evans/db/dbcom at DBEMEA
hotspot-dev at openjdk.java.net
Re: Tools for analysing -XX:+LogCompilation output
The official tool for this is in src/share/tool/LogCompilation in the
hotspot repository. By default it produces output something like
-XX:+PrintCompilation but if you pass the -i option it will report
inlining decisions too. It parses the whole log and builds a
representation of each compile with a tree of the call sites and all the
inlining. Presumably you could modify it to figure out whatever you need.
There are a few parsing bugs in the current version and I have an in
progress set of fixes and feature addition in this webrev
http://cr.openjdk.java.net/~never/6900757. It's not fully cleaned up yet
but it works quite well. There are also some notes on the LogCompilation
output itself at
the way, currently the client compiler doesn't report anything about
inlining so if that's your target you're out of luck for the moment.
On Nov 12, 2009, at 2:06 AM, Ben Evans wrote:
> I hope this mail is appropriate to the group - if there's a doc or a
Fine Wiki I ought to be reading instead, please point me at it.
> I am trying to analyse the output of LogCompilation XML logs, and can't
find a suitable tool.
> The sort of questions I would like answers to are:
> 1) Which of my methods are being inlined?
> 2) Given a method m and an integer d, which methods at call-depth < d
from m are compiled by HS? Which are inlined?
> I see some rather odd results between Solaris 10 and Linux, and am
seeking better insight. My current line of attack is parsing the XML
output by LogCompilation, but if there's an existing tool or a better
approach, I'd love to hear about it.
> Ben Evans
> eFX Algorithmic Trading
> Deutsche Bank, London
> Office: +44 (0)20 7541 3953
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