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  1. JDK
  2. JDK-4390286

java vm eats memory when opening, closing and destroying Java windows

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    • Subcomponent:
    • CPU:
      x86
    • OS:
      generic

      Description

      customer's email:

      We use Java version:
      >java -fullversion:
      java full version "1.3.0-C"

      >java -version:
      java version "1.3.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
      Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)
       
      a) System resources under WinNT 4.0 SP5

      Watching the system resources, when opening, closing and destroying Java
      windows does produce the following behavior: Any action taken on Java
      windows will consume a specific amount of memory. The Java VM increases
      continuously. Even a System.gc(); does not force the VM to free up memory.
      However, minimizing the Java windows into the system taskbar actually does
      free up almost any resource, which was allocated for managing the windows.
      Please explain this behavior and tell us, if there is a way to force the VM
      to free up system resources no longer used.

      The enclosed example window.jar does demonstrates this behavior:
      - start it by running "java -cp window.jar Control"
      - pressing "Create new Windows" creates 100 new windows. Spreading them over
      the desktop allocates a lot of resources.
      - pressing "Close all Windows" closes them. Again, additional resources are
      allocated.
      - repeating the last 2 steps always consumes a little bit more resources.
      - closing all windows and minimizing the control panel frees up almost any
      resources.

      ================================

      I can verify this under Solaris 8 too.
      see attached log file from sdtprocess. ram and swap usage grows continuously when opening and closing windows.

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            • Assignee:
              rraysunw Richard Ray (Inactive)
              Reporter:
              pmaier Peter Maier (Inactive)
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