Production Time Profiling Out of the Box

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Copyright © 2013, Oracle and/or its affiliates. All rights reserved.

Production Time Profiling
Out of the Box
Marcus Hirt
Consulting Member of Technical Staff

Program Agenda
 Introduction to Mission Control
 Convergence Status

 Brief Look at the JMX Console
 Java Flight Recorder

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Program Agenda
 Experimental Plug-ins
 Future

 Resources

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The following is intended to outline our general product direction. It is intended
for information purposes only, and may not be incorporated into any contract.
It is not a commitment to deliver any material, code, or functionality, and should
not be relied upon in making purchasing decisions. The development, release,
and timing of any features or functionality described for Oracle’s products
remains at the sole discretion of Oracle.

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Java Mission Control Overview
The new JDK profiling and diagnostics tools platform
 A tools suite for production use (fine in development too)
– Basic monitoring
– Production time profiling and diagnostics

 Focus on low overhead
– Built into the JVM
– Already available runtime information
– High performance implementation
– More details during the Flight Recorder Tutorial

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History of Mission Control
JRockit Tooling
 The very first JVM management console
 The JRockit Runtime Analyzer
– Mission Control 2
– Eclipse Based

 The Latency Analyzer Tool (LAT)
 JRockit Flight Recorder

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JVM Convergence
Oracle + Sun
 JRockit & HotSpot features to merge
 Use HotSpot as base
 Mission Control for HotSpot
 Now released with 7u40!
 Unfortunately named 5.2.0

It’s really a 1.0.0 release…

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JVM Convergence
 JRockit + Hotspot = Best of Breed JVM
– JCMD (JMX access)

(8)

– Built-in Flight Recorder (engine only)

(7u4)

– Flight Recorder Event Parity

(7u40)

– On-line Heap Analysis
– Native Memory Tracking (JMX access)
– Soft Real-Time GC
– No Perm-Gen

(8)

– Compiler Optimizations
– Improved JMX Agent & JDP
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– …


(7u40)

JVM Convergence
 JRockit + Hotspot = Best of Breed JVM
– JCMD (JMX access)

(8)

– Built-in Flight Recorder (engine only)

(7u4)

– Flight Recorder Event Parity

(7u40)

– On-line Heap Analysis
– Native Memory Tracking

Used by Mission Control

– Soft Real-Time GC
– No Perm-Gen

(8)

– Compiler Optimizations
– Improved JMX Agent & JDP
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– …


(7u40)

Java Mission Control Toolset
(As delivered in the JDK 7u40 release)
 JMX Console
– For monitoring running Java processes in real time
– Monitoring of a few select key indicators
– The implementation in JMC is quite good!

 Java Flight Recorder
– Analogous to a data flight recorder (DFR) in a modern aircraft
– Profiling of running production systems!

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Supported Platforms
Supported Platforms

 Client
– Windows, Linux [x86,x64], MacOSX [x64]
– Building for Solaris x86 and Sparc – not distributed, nor supported

 Server
– Windows, Linux [x86,x64], MacOSX [x64], Solaris [x86,x64,SPARC]

– For OS version specifics, see the 7u40 supported platforms.

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JMC
INSTALLATION
AND USAGE

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JMC installation
 JMC stand alone client
– Simply download and install the JDK (>=7u40)

 Eclipse version
– Install from update site on OTN:
https://download.oracle.com/technology/products/missioncontrol/updatesites/base/5.2.0/eclipse/

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JMC installation, experimental plug-ins
 Two classes of experimental plug-ins
– Features we think may be useful, but want feedback on
– Features not necessarily useful for J2SE users

 Already configured in the stand alone client
– Choose Help | Install New Software…

 Eclipse version
– Install from update site on OTN:
https://download.oracle.com/technology/products/missioncontrol/updatesites/experimental/5.2.0/eclipse/

 Note that experimental plug-ins are:
– Not as thoroughly tested as JMC base
– Not supported
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Starting the JMC client
 Just double-click on the launcher in bin

 Starting from the command line is useful for trouble shooting:

jmc –consoleLog –debug 2>&1 | more
 More info on http://hirt.se/blog/?p=281

 The logging settings file (in java.util.logging format) can be specified

from the preferences
– Window | Preferences | Java Mission Control | Logging Settings File

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Starting the server
 To be able to access Flight Recorder
-XX:+UnlockCommercialFeatures -XX:+FlightRecorder

 Not dynamically enabled like in JRockit (yet)
 There are plenty of command line options for controlling JFR
– More on this in the Tutorial
– Some examples can be found on http://hirt.se/blog

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Starting the Management Agent
For remote access

 Use the com.sun.management.jmxremote properties as normal
http://docs.oracle.com/javase/7/docs/technotes/guides/management/agent.html

 Don’t forget – rmi registry and server port can be set to the same

port – good for tunneling! (>=7u4)
com.sun.management.jmxremote.rmi.port
 To broadcast the presence of the agent on the network (7u40):

com.sun.management.jmxremote.autodiscovery=true
com.sun.management.jdp.name=mygroup/MyJVM (optional)
 Sometimes RMI will get the hostname wrong:
java.rmi.server.hostname=<hostname client should use>

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TOOLS
WALK-THROUGH

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The JMX Console
Highlights

 Simple but feature rich JMX Console
– JConsole on steroids

 Real time monitoring of key indicators
 Triggers
– Simple rules engine
– User can provide custom actions

 Various experimental plug-ins
– Coherence
– JConsole plug-in support
– …
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JMX CONSOLE
DEMO

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Flight Recorder
Highlights

 High performance JVM event recorder
 Produces binary recordings
 Recordings contain runtime profile information
 The recorder can be running continuously
– Whenever something happens, the data can

be dumped
– A bit like having a ”black box” for the JVM

 Recordings are self describing and self contained
 More on the Flight Recorder in the tutorial tomorrow

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FLIGHT
RECORDER
DEMO

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Experimental Plugins
Downloadable from within Mission Control

 WLS plug-in –> tutorial tomorrow
 DTrace plug-in
– Extended DScript language to produce self describing events
– Visualization similar to Flight Recorder

 JOverflow
– Tool for analyzing heap waste (empty/sparse collections)
– Uses hprof dumps
– First stab at using Java FX for visualization in a JMC plug-in

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DTRACE DEMO

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JOVERFLOW
DEMO

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Java Mission Control Future

 Currently working on 5.3.0
– Will be released with JDK 8 and a later 7 update
– Improved JMX Console (Remote Diagnostic Commands and more)
– Improved content type handling and formatting
– 5.3.0 almost feature complete

 Also working on 6.0.0
– Automatic analysis of flight recordings

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Some Java Mission Control Resources
Homepage:
http://oracle.com/missioncontrol
Twitter:
@javamissionctrl
@hirt

Blog:
http://hirt.se/blog

Facebook (not kidding!):
http://www.facebook.com/pages/Java-Mission-Control/275169442493206

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Shameless Book Plug
Oracle JRockit: The Definitive Guide

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“It's an invaluable piece of work.”
“I managed to do in one day what I've failed to do in 2+
weeks using <profiling tool> and <another profiling tool>.”
Maurizio Cimadamore
Ex Lang Tools,
Oracle

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Production Time Profiling Out of the Box

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