a short intro. to java mission control

A (very) Short Intro. To Java Mission Control

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lifeyx

Haim Yadid - Performize-IT

More Info

Java Mission Control and Flight Recorder Demo (Series by OracleLearning @Youtube) Java One SessionOracle JRockit Mission Control Is Dead: Long Live Java Mission Control:http://www.youtube.com/watch?v=ExGzoYQqgkA

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What is Mission Control?

A monitoring and profiling tool for production environments (also dev) JMC consists of two components Collection Infrastructure GUI

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Collection Infrastructure

Flight recorder A rotating buffer collecting profiling events Like A black box in an aircraft

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GUI

Based on Eclipse An Eclipse RCP MBean Server

Management and Monitoring console(JMX) Flight recorder (profiler)

A profiler based on the rotating buffer

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Origin

JMC was traditionally part of JRockit JVM Oracle owns JRockit and Hotspot Merge of JRockit into HotSpot Bundled as part of the HotSpot JDK from J7u40

CPU Profiling: Terminology

MBean Server

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What is JMX

Java Management Extensions (JMX) JVM exposes MBeans (managed beans) Reporting state of JVM resources Which can be consumed by external tools:

JConsole VisualVm Mission Control

CPU Profiling: Terminology

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MBean Server

Can connect to any JVM on the machine, Using attach mechanism (with attach mechanism limitations) Can connect to a remote JVM if remote JMX params A very flexible and customisable User Interface Enables Filtering Can persist monitoring data to a file A demo soon

CPU Profiling: Terminology

Flight Recorder

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Flight Recorder

High performance event recorder Extremely low overhead

Records Event Types of event

Duration [start, end] Instant (exception) Requestable (polling)

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Flight Recorder

A cyclic buffer holding latest history Continuous recording Free to use in development Requires commercial license in production Oops ….

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Enablement

!

J7u40+ -XX:+UnlockCommercialFeatures -XX:+FlightRecorder

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Start flight recording Wizard

Timed Continuous

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Templates

Continuous (for Production) Profiling (for dev) Custom (select you events and frequency)

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Recording dump

A file with extension .jfr Opened in JMC Has the following perspectives

General Memory Code Threads IO System Events

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Recording dump

A file with extension .jfr Opened in JMC Has the following perspectives

General Memory Code Threads IO System Events

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General Tab

Overview JVM Information System variables Recording

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Memory Tab

Overview GC (3 views) Allocations Object Histogram

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Code Tab

Overview Hot Methods Call Tree Exceptions Compilations Class Loading

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Threads Tab

Overview Contention Thread dumps Latencies

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IO Tab

Files Sockets

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System Tab

Overview Processes Environment Variables

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Events Tab

Raw events Logs

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Demo Time

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Thank You

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