production time profiling out of the box

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


Program Agenda

Experimental Plug-ins

Future

Resources


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.


Java Mission Control Overview

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

The new JDK profiling and diagnostics tools platform


History of Mission Control

The very first JVM management console

The JRockit Runtime Analyzer

– Mission Control 2

– Eclipse Based

The Latency Analyzer Tool (LAT)

JRockit Flight Recorder

JRockit Tooling


JVM Convergence

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…

Oracle + Sun


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 (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

– Soft Real-Time GC

– No Perm-Gen (8)

– Compiler Optimizations

– Improved JMX Agent & JDP (7u40)

– …

Used by Mission Control


Java Mission Control Toolset

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!

(As delivered in the JDK 7u40 release)


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.

Supported Platforms


JMC INSTALLATION AND USAGE


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/

https://download.oracle.com/technology/products/missioncontrol/updatesites/base/5.2.0/eclipse/




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

https://download.oracle.com/technology/products/missioncontrol/updatesites/experimental/5.2.0/eclipse/




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

http://hirt.se/blog/?p=281


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

http://hirt.se/blog


Starting the Management Agent

Use the com.sun.management.jmxremote properties as normalhttp://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>

For remote access

http://docs.oracle.com/javase/7/docs/technotes/guides/management/agent.html


TOOLS WALK-THROUGH


The JMX Console

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

– …

Highlights


JMX CONSOLEDEMO


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

Flight RecorderHighlights


FLIGHT RECORDER DEMO


Experimental Plugins

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

Downloadable from within Mission Control


DTRACE DEMO


JOVERFLOWDEMO


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


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

http://oracle.com/missioncontrol

http://www.facebook.com/pages/Java-Mission-Control/275169442493206






Shameless Book PlugOracle JRockit: The Definitive Guide


Maurizio CimadamoreEx Lang Tools, Oracle

“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>.”


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production time profiling out of the box

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