IBM User Guide for Java V7 on Windows > Performance
Class data sharing between JVMs
Class data sharing enables multiple JVMs to share a single space in memory.
You can share class data between Java Virtual Machines (JVMs) by storing it in a memory-mapped cache file on disk. Sharing reduces the overall virtual storage consumption when more than one JVM shares a cache. Sharing also reduces the startup time for a JVM after the cache has been created. The shared class cache is independent of any running JVM and persists until it is deleted.
A shared cache can contain:
- Bootstrap classes
- Application classes
- Metadata that describes the classes
- Ahead-of-time (AOT) compiled code
See
- Overview of class data sharing
- Class data sharing command-line options
- Creating, populating, monitoring, and deleting a cache
- Performance and memory consumption
- Considerations and limitations of using class data sharing
- Adapting custom class loaders to share classes
Parent: Performance
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