JProfiler
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JProfiler is an award-winning all-in-one Java profiler. JProfiler's intuitive GUI helps you find performance bottlenecks, pin down memory leaks and resolve threading issues.

特征综述 About Feature

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JProfiler's Features
  • Memory profiling
    JProfiler's memory view section offers dynamically updated views on memory usage and views that show information about allocations spots. All views have several aggregation levels and can show live and garbage collected objects.

    • All objects
      Shows classes or packages of all objects on the heap with instance counts and size information. You can mark current values and show differences.
    • Recorded objects
      Shows classes or packages of all recorded objects. You can mark current values and show differences.
    • Allocation call tree
      Shows a call tree or methods, classes, packages or J2EE components with annotated allocations of selected classes.
    • Allocation hot spots
      Shows a list of methods, classes, packages or J2EE components that allocate selected classes. You can mark current values and show differences. The tree of backtraces can be shown for each hot spot.

  • Heap walker
    In JProfiler's heap walker you can take a snapshot of the heap and drill down to objects of interest by performing selection steps. The heap walker has five views:

    • Classes
      Shows all classes and their instances.
    • Allocations
      Shows allocation tree and allocation hot spots for recorded objects.
    • References
      Shows a graph of references for individual objects and offers a "show path to garbage collector root" functionality. Also offers cumulated views for incoming and outgoing references.
    • Data
      Shows instance and class data for individual objects.
    • Time
      Shows a time-resolved histogram of recorded objects.

  • CPU profiling
    JProfiler offers various ways to record the call tree to optimize for performance or detail. The thread or thread group as well as the thread status can be chosen for all views. All views can be aggregated on a method, class, package or J2EE component level. The CPU view section contains:

    • Call tree
      Shows a cumulated top-down tree of all recorded call sequences in the JVM. JDBC, JMS and JNDI service calls are annotated into the call tree. The call tree can be split for different request URL to a servlet or JSP.
    • Hot spots
      Shows the list of the most time consuming methods. The tree of backtraces can be shown for each hot spot. Hotspots can be calculated for method calls, JDBC, JMS and JNDI service calls, as well as for URL invocations.
    • Call graph
      Shows a graph of call sequences starting from selected methods, classes, packages or J2EE components.

  • Thread profiling
    For thread profiling, JProfiler offers the following views:

    • Thread history
      Shows a timeline with thread activity and thread status.
    • Thread monitor
      Shows a list of all live threads with their current activity.
    • Deadlock detection graph
      Shows a graph of all deadlocks in the JVM.
    • Current monitor usage
      Shows the currently used monitors and their associated threads.
    • Monitor usage history
      Shows the history of significant waiting and blocking events.
    • Monitor usage statistics
      Shows statistics for monitors grouped by monitors, threads and classes of monitors.

  • VM telemetry
    To observe the internal state of your JVM, JProfiler offers various telemetry views:

    • Heap
      Shows a timeline with a graph of the used heap and the heap size.
    • Objects
      Shows a timeline with a graph of live objects and arrays.
    • Garbage collector
      Shows a timeline with a graph of garbage collector activity.
    • Classes
      Shows a timeline with a graph of loaded classes.
    • Threads
      Shows a timeline with a graph of active threads.

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