Java Tools Tutorials - Herong's Tutorial Notes - Version 5.32, by Dr. Herong Yang

Java Tools Tutorials - Herong's Tutorial Notes

∟'jstat' - JVM Statistics Monitoring Tool

∟'jstat' Command Options and Parameters

"jstat": A JVM statistics monitoring tool that displays performance statistics of a given JVM process with a specified sampling interval. "jstat" tool is distributed as part of the JDK package and represented by the \Progra~1\java\jdk*\bin\jstat.exe program file. "jstat" can be executed with the following syntax:

jstat [options] vmid interval [count]

• "options" - List of "jstat" command options.
• "vmid" - Virtual machine identifier string to identify a local or a remote JVM process.
• "interval" - Sampling interval in seconds (s) or milliseconds (ms).
• "count" - Number of samples to collect. Default value is infinity; that is, jstat displays statistics until the target JVM terminates or the jstat command is terminated.

Some "jstat" options are listed below:

• "-t" - Display a timestamp column as the first column of output. The timestamp is the time since the start time of the target JVM.
• "-class" - Display multiple columns of statistics on the behavior of the class loader.
• "-compiler" - Display multiple columns of statistics of the behavior of the HotSpot Just-in-Time compiler.
• "-gc" - Display multiple columns of statistics of the behavior of the garbage collected heap.
• "-gcutil" - Display multiple columns of summary of garbage collection statistics.
• "-gccapacity" - Display multiple columns of statistics of the capacities of the generations and their corresponding spaces.

See the next section on how to use "jstat" to collect statistic samples of a given JVM process.

Last update: 2015.

Table of Contents

 About This Book

 Java Tools Terminology

 Installing Java 8 on Windows

 'javac' - The Java Program Compiler

 'java' - The Java Program Launcher

 'jdb' - The Java Debugger

 'jconsole' - Java Monitoring and Management Console

►'jstat' - JVM Statistics Monitoring Tool

 'jps' - JVM Process Status Tool

 Listing JVM Processes on the Local Machine with "jps"

 'jstatd' - JVM Remote Monitoring Server

 Starting 'jstatd' with a Security Policy File

 Connecting to 'jps' to Remote 'jstatd'

►'jstat' Command Options and Parameters

 Garbage Collection Testing Program

 'jstat -gcutil' - Garbage Collection Statistics

 Accessing Remote JVM Processes with 'jstat'

 JVM Troubleshooting Tools

 jvisualvm (Java VisualVM) - JVM Visual Tool

 'jar' - The JAR File Tool

 'javap' - The Java Class File Disassembler

 'keytool' - Public Key Certificate Tool

 'native2ascii' - Native-to-ASCII Encoding Converter

 Outdated Tutorials

 References

 PDF Printing Version

'jstat' Command Options and Parameters - Updated in 2017, by Dr. Herong Yang