Monitoring Tools
You can use the following tools to monitor JVM performance statistics. The tools described in this section are unsupported and experimental, and should be used with that in mind. They may not be available in future JDK versions.
These tools are supported on all platforms except Windows 98 and Windows ME.
| Tool Name | Brief Description |
|---|---|
| jps | Experimental: JVM Process Status Tool - Lists instrumented HotSpot Java virtual machines on a target system. |
| jstat | Experimental: JVM Statistics Monitoring Tool - Attaches to an instrumented HotSpot Java virtual machine and collects and logs performance statistics as specified by the command line options. |
| jstatd | Experimental: JVM jstat Daemon - Launches an RMI server application that monitors for the creation and termination of instrumented HotSpot Java virtual machines and provides a interface to allow remote monitoring tools to attach to Java virtual machines running on the local system. |
Troubleshooting Tools
The following tools can be used for specific troubleshooting tasks. The tools described in this section are unsupported and experimental in nature and should be used with that in mind. They may not be available in future JDK versions.
Some of these tools are not currently available on Windows platforms.
| Tool Name | Brief Description |
|---|---|
| jinfo | Experimental - Configuration Info for Java - Prints configuration information for a given process or core file or a remote debug server. |
| jhat | Experimental - Heap Dump Browser - Starts a web server on a heap dump file (for example, produced by jmap -dump), allowing the heap to be browsed. |
| jmap | Experimental - Memory Map for Java - Prints shared object memory maps or heap memory details of a given process or core file or a remote debug server. |
| jsadebugd | Experimental - Serviceability Agent Debug Daemon for Java - Attaches to a process or core file and acts as a debug server. |
| jstack | Experimental - Stack Trace for Java - Prints a stack trace of threads for a given process or core file or remote debug server. |