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Download jconsole for windows free.jconsole - Java Monitoring and Management Console

 

The bar will turn red when the memory used exceeds the memory usage threshold. You can set the memory usage threshold through an attribute of the MemoryMXBean. Heap memory is the runtime data area from which the JVM allocates memory for all class instances and arrays. The heap may be of a fixed or variable size. The garbage collector is an automatic memory management system that reclaims heap memory for objects. Non-heap memory includes a method area shared among all threads and memory required for the internal processing or optimization for the JVM.

It stores per-class structures such as a runtime constant pool, field and method data, and the code for methods and constructors. The method area is logically part of the heap but, depending on implementation, a JVM may not garbage collect or compact it. Like the heap, the method area may be of fixed or variable size. The memory for the method area does not need to be contiguous.

In addition to the method area, a JVM implementation may require memory for internal processing or optimization which also belongs to non-heap memory.

For example, the JIT compiler requires memory for storing the native machine code translated from the JVM code for high performance. A memory pool represents a memory area that the JVM manages.

The JVM has at least one memory pool and it may create or remove memory pools during execution. A memory pool can belong to either heap or non-heap memory. A memory manager manages one or more memory pools.

The garbage collector is a type of memory manager responsible for reclaiming memory used by unreachable objects.

A JVM may have one or more memory managers. It may add or remove memory managers during execution. A memory pool can be managed by more than one memory manager. It is common to think of objects that have active references as being "alive" and un-referenced or unreachable objects as "dead. The algorithms and parameters used by GC can have dramatic effects on performance. The HotSpot VM garbage collector uses generational garbage collection.

Generational GC takes advantage of the observation that, in practice, most programs create:. So, generational GC divides memory into several generations , and assigns each a memory pool. When a generation uses up its allotted memory, the VM performs a partial garbage collection also called a minor collection on that memory pool to reclaim memory used by dead objects.

This partial GC is usually much faster than a full GC. The HotSpot VM defines two generations: the young generation sometimes called the "nursery" and the old generation. The young generation consists of an "eden space" and two "survivor spaces. When it performs a minor GC, the VM moves any remaining objects from the eden space to one of the survivor spaces.

The VM moves objects that live long enough in the survivor spaces to the "tenured" space in the old generation. When the tenured generation fills up, there is a full GC that is often much slower because it involves all live objects. The permanent generation holds all the reflective data of the virtual machine itself, such as class and method objects.

As explained in the following documents, if the garbage collector has become a bottleneck, you can improve performance by customizing the generation sizes. Using jconsole, explore the sensitivity of your performance metric to the garbage collector parameters.

For more information, see:. The Threads list in the lower left lists all the active threads. If you enter a string in the Filter field, the Threads list will show only those threads whose name contains the string you enter. However, you will need to download and install Apache Ant version 1.

Introduction The jconsole tool is a JMX-compliant graphical tool for monitoring a Java virtual machine. In addition to the existing standard tabs, you can add your own custom tabs to JConsole, to perform your own monitoring activities.

Contributing to JConsole To contribute to JConsole, make sure you read the page explaining how to contribute to the OpenJDK project, and follow the rules and guidelines described there.

To build JConsole, run the command ' ant build '. To test JConsole, run the command ' ant test '. To run JConsole, run the command ' ant run '.

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Downloading JConsole and connecting it to a local Java process..

   

Non-heap memory includes a method area shared among all threads and memory required for the internal processing or optimization for the JVM. It stores per-class structures such as a runtime constant pool, field and method data, and the code for methods and constructors. The method area is logically part of the heap but, depending on implementation, a JVM may not garbage collect or compact it.

Like the heap, the method area may be of fixed or variable size. The memory for the method area does not need to be contiguous. In addition to the method area, a JVM implementation may require memory for internal processing or optimization which also belongs to non-heap memory.

For example, the JIT compiler requires memory for storing the native machine code translated from the JVM code for high performance. A memory pool represents a memory area that the JVM manages.

The JVM has at least one memory pool and it may create or remove memory pools during execution. A memory pool can belong to either heap or non-heap memory. A memory manager manages one or more memory pools. The garbage collector is a type of memory manager responsible for reclaiming memory used by unreachable objects. A JVM may have one or more memory managers. It may add or remove memory managers during execution. A memory pool can be managed by more than one memory manager.

It is common to think of objects that have active references as being "alive" and un-referenced or unreachable objects as "dead. The algorithms and parameters used by GC can have dramatic effects on performance. The HotSpot VM garbage collector uses generational garbage collection. Generational GC takes advantage of the observation that, in practice, most programs create:. So, generational GC divides memory into several generations , and assigns each a memory pool. When a generation uses up its allotted memory, the VM performs a partial garbage collection also called a minor collection on that memory pool to reclaim memory used by dead objects.

This partial GC is usually much faster than a full GC. The HotSpot VM defines two generations: the young generation sometimes called the "nursery" and the old generation. The young generation consists of an "eden space" and two "survivor spaces. When it performs a minor GC, the VM moves any remaining objects from the eden space to one of the survivor spaces. Here, LocalJavaProcess. The program is compiled and executed with JRE 8.

On starting JConsole, we can see that there are three Java processes running on the system. The first one is Eclipse, the second one is the JConsole instance itself and the third one is the Java application that we started using Eclipse.

The process name will be visible as the fully qualified name of the Java class with the main function. To enable JMX monitoring for these applications. If you are using the command prompt to run your java program, you need to add the VM argument after java and before the class name. But you will not be able to connect to it. The process even though visible in the list of Java process, cannot be monitored using JConsole.

See Using JConsole for more information on jconsole's functionality and the jconsole command-line tool documentation for jconsole's command-line options. To contribute to JConsole, make sure you read the page explaining how to contribute to the OpenJDK project, and follow the rules and guidelines described there. You will find out that there can be many ways to contribute: one of them is to contribute to the quality.

JConsole doesn't contain native code. It's a pure java tool.