Revision as of 16:59, 6 December 2005

Types of Memory

• Normal heap. Use -J-verbosegc to debug this
• Permanent heap. Configured with -XX:MaxPermSize. The default is generally too small
• malloc() memory. Used by JNI and in small parts by the JVM.
• mmap memory. On Unix, .jar files are mmapped taking up virtual memory.
• Thread stacks. Each thread has preallocated stack memory. The default is 8m.

See Also

• Garbage Collection