Java Runtime Monitor 

Introduction:

This section is common to all the editions of IT360, as per the below constraints;

Monitor Information:

Java Runtime Monitor provides out-of-the-box remote monitoring and management on the Java platform, and of applications that run on it. It gives memory and thread statistics. Thresholds can be associated and alerts can be generated.

Note: Support is available for JRE1.5 and above.

Java Runtime Monitor checks the availability, response time, connection time (time taken by the IT360 to look up the JMX agent on the remote JVM) of the monitor, along with many other parameters, listed below.

Parameter

Description

Monitor Information

Name

Name of the JavaRuntime monitor.

Health

Specifies the health (Clear, Warning, Critical), of the JavaRuntime monitor.
Type Specifies the type, you are monitoring.
Host Name Specifies the host, at which the database server is running.
Port Specifies the port number, at which the JavaRuntime monitor is running.

Host OS

Specifies the OS of the host, where the JavaRuntime monitor is running.

Last Polled at

Specifies the time, at which the last poll was performed.

Next Poll at

Specifies the time, at which the next poll is scheduled.

Availability

Shows the current status of the JavaRuntime monitor - Available or Not available.

Connection Time

Time taken to connect to the JavaRuntime.

Process Memory

Eden Space (Heap Memory)

The pool, from which the memory is initially allocated for most objects.

Survivor Space (Heap Memory)

Pool containing objects that have survived GC of eden space.
Tenured Generation (Heap Memory) Pool containing objects that have existed for some time in the survivor space.
Permanent Generation (Non-Heap) Holds all the reflective data of the virtual machine itself, such as class and method objects. With JVMs that use class data sharing, this generation is divided into read-only and read-write areas.
Code Cache (Non-Heap) Memory used for compilation and storage of native code.
Thread Parameters
Total threads started Total number of threads created and also started, since the Java virtual machine started.
Peak Threads Peak live thread count, since the Java virtual machine started, or peak was reset.
Live Threads Number of live threads, currently running.
Daemon Threads Number of daemon threads, currently running.
Runnable Threads A thread, executing in the Java virtual machine is in this state.
Blocked Threads A thread that is blocked waiting for a monitor lock is in this state.
Waiting Threads A thread that is waiting indefinitely for another thread, to perform a particular action, is in this state.
Timed waiting Threads A thread that is waiting for another thread to perform an action, for up to a specified waiting time, is in this state.
Deadlocked Number of threads that are in deadlock, waiting to acquire object monitors.
Virtual Memory Parameters
Classes loaded Number of classes loaded.
Classes Unloaded Number of classes unloaded.
GC time Time taken to perform garbage collection.
Compile time Time spent in just-in-time (JIT) compilation.
Max file descriptor Maximum permissible open file descriptor. Available only for UNIX.
Host Memory Parameters
Total Physical Memory Total amount of physical memory, in Megabytes.
Free Physical Memory The amount of free physical memory, in Megabytes.
Total Swap Space Total amount of swap space, in Megabytes.
Committed Virtual Memory The amount of virtual memory that is guaranteed to be available to the running process, in Megabytes.
Garbage Collector
Time Spent/Min Approximate collection elapsed time, in milliseconds.
Collections/Min Total number of collections that have occurred.
Thread Count Number of threads, used for Garbage Collector.
Last Start Time Start time of this GC.
Last End Time End time of this GC.
Memory usage before GC Memory usage of all memory pools, at the beginning of this GC.
Memory usage after GC Memory usage of all memory pools, at the end of this GC.
Configuration
Uptime The uptime of the Java virtual machine.
Java Virtual Machine The Java virtual machine implementation name.
Vendor The Java virtual machine implementation vendor.
Process ID The process identifier is a number, used by some operating system kernels, to uniquely identify a process.
Name The name, representing the running Java virtual machine.
VM arguments The input arguments, passed to the Java virtual machine, which does not include the arguments to the main method.
Class path The Java class path that is used by the system class loader, to search for class files.
Library path The Java library path.
Boot class path The boot class path that is used by the bootstrap class loader, to search for class files.
JIT compiler The name of the Just-in-time (JIT) compiler.
Objects Pending for finalization The approximate number of objects, for which finalization is pending.
Operating System The name of the operating system.
Architecture The operating system architecture.
Processors The number of processors, available to the Java Virtual Machine.

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View Thread Dump:

There is an option to view the thread dump history, under 'Threads' tab. Click the 'View Thread Dump' link in the 'Threads' tab. The Thread Dump screen opens up in a new window, where you will be able to view the current thread dump details. Once you close this window, the thread dump details are moved under the Thread History section. You can view this information, any time, you want from this section.

Reports:

We provide this option, in order to view both realtime and historical data of any of the attributes, present in the 'Configuration Information' section under the Configuration tab. Click on any attribute, under the Configuration tab. This will open up a new window, named 'History Data' that provides more information about these attributes.

There are two tabs in the History Data window;

  1. History Report - This tab provides historical reports of the attribute, selected based on the time period chosen. You can also use the Select Attribute drop-down box, and view reports for other attributes.

  2. Global View: This tab displays the current values of the attribute selected, across multiple monitors. To view information about other attributes, present in the monitor, use the Select Attribute drop-down box, and change the attribute.

If you want to view data of multiple attributes, click the Customize Columns link, present at the top left corner of the window. This will take you to the Edit Global View screen. In this screen, you can change the monitor type, by using the Filter by Monitor Type drop-down box, select the metrics to be displayed, and show monitors on monitor basis, or monitor group basis. After you select your options, click the Show Report button, to view those information in the Global View tab.

Few Help Links for Reference:

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See Also:

Creating New Monitor - Java Runtime Monitor



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