javamemory-managementmemory-footprint

How to determine the size of PermGen within a Java application (i.e., programmatically)?

  1. Is there any way to measure the currently used size of permanent generation (PermGen) within my Java application? I cannot use external profiling tools such as VisualVM.

  2. Even better would be an estimation of the memory consumption of a Java class in the PermGen. Is it nearly proportional to the size of the bytecode file?

Solution

  • You could use MemoryMXBean that comes with JDK. But I don't think there is a way to query on the permgen usage from within a running application. Docs about MemoryMXBean.