Thermostat

From IcedTea

This wiki is mainly for Thermostat developers and organized as such. If you are not a Thermostat developer, please start at the home page instead. If you are a new user, please see the User Guide on how to get started.

Thermostat.next Developer Resources

1 What is Thermostat?
2 Why Thermostat?
3 Screenshots
- 3.1 Thermostat Swing GUI
- 3.2 Thermostat Shell (CLI)
4 Using Thermostat
5 Thermostat Development
6 Thermostat Features
7 Thermostat Talks and Presentations
8 OSGi Services
9 NUMA

1 What is Thermostat?

Thermostat is an instrumentation tool for the Hotspot JVM, with support for monitoring multiple JVM instances on multiple hosts, optionally in a cloud environment.

We want a tool that allows users of IcedTea/OpenJDK to monitor running JVMs, especially remote JVMs.
Both high level (uptime, cpu and memory usage) and low level (including hotspot's perf data) information should be available through the tool.
The tool should be usable in a production environment, with minimal overhead.

Please see the home page and the User Guide on how to get, install and use Thermostat.

The name Thermostat is intended as a play on words - Thermostat is to Hotspot much as IcedTea is to Java. There are a number of ways of accessing information about the running Hotspot JVM. These include jstatd, JMX, JVMTI, and Systemtap. There is also information available from the host system that would be relevant to developers and administrators. Thermostat should provide a pluggable framework for using one or more of these information sources to monitor local or remote JVMs, in order to best allow us as well as other members of the Open Source Java community to extend the collection capability of the system.

It is worth noting that there is some overlap in terms of the information that several of these monitoring tools/APIs can provide.

2 Why Thermostat?

Here is some discussion about what makes Thermostat stand out.

3 Screenshots

3.1 Thermostat Swing GUI

Host Overview	Host CPU View	Host Memory View	Host NUMA View
Host Notes View	JVM Overview	JVM CPU View	JVM Garbage Collection Cycles View
JVM Loaded Classes Stats View	JVM Memory Regions View	JVM Heap View (Dumped Heap Selected)	JVM Heap View (Object Browser)
JVM Threads View	JVM Threads View (Pie Chart)	JVM Threads View (Thread Count Stats)	Thermostat Agent Backends View