Java

Java Analysis

Linux Applications - Best Practices - Java

ESAMON screens/ESAMAP reports:

Java Virtual Machines

ESAJVM - Java Subsystem Analysis

JVM Threads

ESAJVMT - Java Thread Analysis

Using zVPS to find information for solving issues with the Linux applications:

ESAJVM - Shows information about the Java Virtual Machine on nodes being monitored.

Node - This shows the zTCP node name.

Name - This shows the name of the JVM application as defined in snmpd.conf.

Type - This shows the type of application as defined in the snmpd.conf.

CPU (ms) - This shows the total CPU for all the java threads for this server.

Heap Memory (MB) - This shows the total amount of JVM heap memory - Initially requested, Used, Committed and Maximum for all heap memory pools.

Note: Can click on a line (zview) or zoom (z/VM) to see all of the JVM threads (ESAJVMT).

ESAJVMT - Shows information about the Java Virtual Machine threads.

Node - This shows the name of the server.

Application Name - This shows the description of the JVM application as defined in snmpd.conf.

Thrd Num - This shows the thread number.

Blocks - This shows the rate per second that the thread has blocked to enter or re-enter a monitor.

Wait - This shows the rate per second that the thread has waited for notification.

CPU (ms) - This shows the CPU time used by the thread.

Status - This shows the status of the thread.

Blocked - A blocked thread is a thread in a runnable state of the thread life cycle and is contending for a lock.
A blocked thread has more impact to the scheduler.

New Thread- a not yet started thread

Runnable- executing in the JVM but may be waiting for other resources such as CPU.

Terminated- a thread that has completed execution.

Timed wait- waiting a specific amount of time.

Waiting -A thread in wait state is dormant and has less impact on the scheduler.

Second status - In native- executing native code via Java Native Interface (JNI)

Second status - Suspended- suspended via a Thread.suspend() call.

Thread Name - This shows the name of the thread.