JDK-6840305 : Discrepancy in system memory details (when 4G or greater) reported by JVM and Windows OS
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 5.0u16
  • Priority: P2
  • Status: Closed
  • Resolution: Won't Fix
  • OS: windows_2008
  • CPU: generic
  • Submitted: 2009-05-12
  • Updated: 2011-02-16
  • Resolved: 2009-07-14
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JDK 6 JDK 7 Other
6u16-revFixed 7Fixed hs14.2Fixed
Description
Customer seeing a discrepancy in system memory details shown in hs_err log and the actual memory in the win2k8 server.

Actual RAM size  :4GB  but in hs_err it is  physical 2097151k(157596k free)
Actual Virtual Memory      :8GB but in hs_err it is swap 4194303k(3189640k free)

Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/8c79517a9300
17-07-2009

EVALUATION GlobalMemoryStatus() does not report correct memory usage when the system has more than 4gb of RAM. GlobalMemoryStatusEx() should be used in place of GlobalMemoryStatus().
17-06-2009