A short Intro. to Java Mission Control

A (very) Short Intro. To Java Mission Control

© Copyright Performize-IT LTD.

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


What is Mission Control?

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

© Copyright Performize-IT LTD.CPU Profiling

Collection Infrastructure

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


GUI

Based on Eclipse An Eclipse RCP MBean Server

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

A profiler based on the rotating buffer



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



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



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


Flight Recorder


Flight Recorder

High performance event recorder Extremely low overhead

Records Event Types of event

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


Flight Recorder

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


Enablement

!

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


Start flight recording Wizard

Timed Continuous


Templates

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


Recording dump

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

General Memory Code Threads IO System Events


Recording dump

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

General Memory Code Threads IO System Events


General Tab

Overview JVM Information System variables Recording


Memory Tab

Overview GC (3 views) Allocations Object Histogram


Code Tab

Overview Hot Methods Call Tree Exceptions Compilations Class Loading


Threads Tab

Overview Contention Thread dumps Latencies


IO Tab

Files Sockets


System Tab

Overview Processes Environment Variables


Events Tab

Raw events Logs


Demo Time


Thank You

www.performize-it.com


Date post:	18-Dec-2014
Category:	Technology
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A short Intro. to Java Mission Control

Technology