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Jdk Tools For Performance Diagnostics
 

Jdk Tools For Performance Diagnostics

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Coverage of JDK tools for JVM performance monitoring including visualvm, jhat and btrace

Coverage of JDK tools for JVM performance monitoring including visualvm, jhat and btrace

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    Jdk Tools For Performance Diagnostics Jdk Tools For Performance Diagnostics Presentation Transcript

    • JDK tools for performance diagnostics Dror Bereznitsky Director of Technologies, AlphaCSP
    • Introduction
      • Application to slow ?
      Image courtesy of WTL photos - flickr
    • Introduction Leaking Memory ? Image courtesy of neoliminal - flickr
    • Intoduction Suffering from deadlocks ? Image courtesy of hfb - flickr
    • Introduction
      • The JDK has tools that can help you …
      Image courtesy of docman - flickr
    • JDK tools for performance diag.
      • JDK tools for performance diagnostics:
      Image courtesy of dodgechallenger1 - flickr
        • VisualVM
        • BTrace
        • jhat
        • jmap
        • jconsole
        • jstat
        • jinfo
        • jps
        • jstack
    • VisualVM
    • VisualVM
      • Java troubleshooting tool
      • Visual tool integrating several command line JDK tools and much more
      • For development and production time
    • VisualVM Features
      • Display local/remote Java applications
      • Monitor memory and threads
      • Take and browse heap + thread dumps
      • Extensible with plugins
      • Attach API or JMX
      • MBean browser
      • Visual GC
      • Memory sampler
      • Profiler – CPU, Memory
      • BTrace plugin
      • Direct buffers monitor (JDK 7)
      • Many more …
      VisualVM Plugins
    • VisualVM Feature Matrix           JDK 6 Local      JDK 6 Remote      JDK 5 JConsole plugins MBean Browser Heam Dump OOME Heap Dump Thread Dump Profiler Threads  Monitor System properties  Overview JDK 1.4.2
    • Supported VMs Requires the VisualVM Extensions plugin SAP JDK HP-UX JDK Using JMX only IBM J9 Oracle JRockit Apple JDK Open JDK Sun JDK Remarks Java VM
    • Getting Started
      • Version 1.0 ships with JDK6 since update 7
        • Look for jvisualvm in your JDK bin directory
      • Version 1.1.1 now ships with JDK6 update 14
      • Latest version can be downloaded from https:// visualvm.dev.java.net
    • The Demo Application
    • VisualVM Demo
      • VisualVM Demo
    • Working With Remote Applications
      • Start a jstatd daemon on the remote host
        • Allow remote monitoring tools to attach to running JVMs
        • May have security implications
      • Add the remote host to the ‘Remote’ node in the Applications window
    • Extending VisualVM
      • What is VisualVM, really?
      • Generic desktop application infrastructure for analyzing sources of data.
      • Default data sources
        • Applications
        • Hosts
        • Dumps
        • Snapshots
    • Extending VisualVM
      • Why you would want to extend VisualVM:
        • Tool-Centric You have a monitoring or management tool that you want to make available to VisualVM
          • BTrace plugin
        • Application-Centric You have an application with specific monitoring/management needs
          • Glassfish plugin
    • Extending VisualVM
      • What Can You Create?
        • Tabs: Main tabs, Sub tabs
        • Actions: Menu items, Toolbar buttons
        • Application Types
        • Data Sources
    • Getting Started With Extending VisualVM
      • Install JDK 6
      • Read VisualVM API Javadoc & Tutorials
      • Create VisualVM modules
        • Netbeans IDE
      • VisualVM samples collection
    • VisualVM Usage Scenarios
      • General health monitoring
      • Diagnose specific problems
        • Memory leaks
        • Deadlocks
        • Excessive use of finalizers
        • Hot lock contention
        • Hung process
    • BTrace
    • BTrace
      • Dynamic tracing tool for the Java platform
      • Safe – read, no write
      • Low-overhead
      • Tracing code is written in Java
      • Available as a VisualVM plugin or as a command line tool
    • Dynamic Tracing
      • Works by dynamically instrumenting classes of a running Java program – using ASM 3.0
        • ASM is an all purpose Java bytecode manipulation and analysis framework
      • Inserts tracing actions by hot-swapping the traced program classes
    • BTrace HelloWorld Example
      • import com.sun.btrace.annotations.*;
      • import static com.sun.btrace.BTraceUtils.*;
      • @BTrace
      • public class HelloWorld {
      • @OnMethod (
      • clazz= "java.lang.Thread" ,
      • method= "start"
      • )
      • public static void func() {
      • println( "about to start a thread!" );
      • }
      • }
    • BTrace Terminology
      • Probe Point
        • "location" or "event" at which a set of tracing statements are executed.
      • Trace Actions/Actions
        • Trace statements that are executed whenever a probe "fires".
      • Action Methods
        • Trace statements that are executed when a probe fires
        • defined inside a static method
        • Such methods are called "action" methods.
    • BTrace HelloWorld Example
      • import com.sun.btrace.annotations.*;
      • import static com.sun.btrace.BTraceUtils.*;
      • @BTrace
      • public class HelloWorld {
      • @OnMethod (
      • clazz= "java.lang.Thread" ,
      • method= "start"
      • )
      • public static void func() {
      • println( "about to start a thread!" );
      • }
      • }
      Probe Point Action Method
    • Some BTrace Annotations
      • @OnMethod
        • Specify target class(es), target method(s) and "location(s)" within the method(s)
      • @OnLowMemory
        • Trace memory threshold exceed event
      • @OnTimer
        • Specify tracing actions that have to run periodically once every N milliseconds
      • can not create new objects.
      • can not create new arrays.
      • can not throw exceptions.
      • can not catch exceptions.
      • can not have loops (for, while, do..while)
      • Almost everything is restricted …
      BTrace Restrictions ?
    • com . sun . btrace . BTraceUtils
      • Contains 270 public static methods which may be called from a BTrace script
      • Many useful methods:
        • deadlocks - prints the Java level deadlocks detected (if any)
        • dumpHeap - dump the snapshot of the Java heap
        • jstack - Prints the java stack trace of the current thread
    • Getting Started
      • BTrace is available as a VisualVM plugin
      • Requires VisualVM 1.0.1+
      • Available at the BTrace plugin center - https:// btrace.dev.java.net/uc/updates.xml
    • BTrace Demo
      • Demo
    • BTrace Demo Source
      • @BTrace
      • public class SizeOfStatusCache {
        • @OnMethod(
          • clazz = "com.alphacsp.performance.seminar.twitter.Main" ,
          • method = "pollForNewStatuses" ,
          • location = @Location( Kind. RETURN) )
        • public static void onNewStatuses(Object obj) {
        • List statusCache =
        • (List) get(field(classOf( obj), "statusCache" , true ), obj);
        • println(concat( "Number of cached statuses: " ,
        • str(size( statusCache))));
        • }
      • }
    • BTrace Usage Scenarios
      • Fine grained performance analysis
      • Runtime profiling and monitoring
      • Collecting statistics
      • When no graphic user interface available
    • jhat
      • jhat
    • jhat
      • Java Heap Analysis Tool
      • Parses a java heap dump and launches a web server
      • Basic web interface for browsing the heap dump
      • Useful for analyzing memory leaks
    • jhat Features
      • View all class instances
      • View class classloader
      • View all references to an object
      • View reference chains from Rootset
      • Use OQL ( O bject Q uery L anguage) to query heap dumps
    • OQL
      • SQL-like query language to query Java heap
      • Based on JavaScript expression language
      • Built-in objects and functions
      • OQL help is available from the jhat OQL screen
    • Getting Started
      • C:jdk1.6.0_13in>jhat -J-mx512m c:heapdump-1245057502890.hprof
      • Reading from c:heapdump-1245057502890.hprof...
      • Dump file created Mon Jun 15 12:18:22 IDT 2009
      • Snapshot read, resolving...
      • Resolving 120908 objects...
      • Chasing references, expect 24 dots ........................
      • Eliminating duplicate references........................
      • Snapshot resolved.
      • Started HTTP server on port 7000
      • Server is ready.
    • jhat demo
      • jhat Demo
    • jhat Usage Scenarios
      • When analyzing large heap dumps – can use a remote powerful server
      • When you do not have a graphic user interface
      • If you want to perform smart queries on heap content
    • Summary
      • Summary
    • Summary
      • The JDK contains useful performance diagnostics tools
      • These tools can be used for detecting, analyzing and solving performance related issues
    • References
      • Monitoring and Troubleshooting Java applications using JDK tools (PDF)
      • VisualVM
      • VisualVM Sample Collection
      • TS-4247 Getting More Out of the Java VisualVM Tool (PDF)
      • btrace
      • ASM
      • jhat
      • Thank You 