JDK-7196801 : NPG: Fix java/lang/management/MemoryMXBean/LowMemoryTest2
  • Type: Bug
  • Component: core-svc
  • Sub-Component: java.lang.management
  • Affected Version: 8
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2012-09-07
  • Updated: 2014-04-07
  • Resolved: 2013-10-14
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JDK 8
8 b113Fixed
Related Reports
Blocks :  
JDK-8000754 - NPG: Implement a MemoryPool MXBean for Metaspace
Blocks :  
JDK-8013590 - NPG: Add a memory pool MXBean for Metaspace
Blocks :  
JDK-8025996 - Track metaspace usage when metaspace is expanded
Blocks :  
JDK-8024547 - MaxMetaspaceSize should limit the committed memory used by the metaspaces
Duplicate :  
JDK-8025089 - MetaspaceMemoryPoolMXBean.getUsage() throws "Memory Pool not found" error
Duplicate :  
JDK-6842298 - Occasional failing testcase java/lang/management/MemoryMXBean/LowMemoryTest2.sh
Relates :  
JDK-7198162 - exclude test MemoryMXBean/LowMemoryTest2.sh
Description
The java/lang/management/MemoryMXBean/LowMemoryTest2 is timing out.  It is
spending lots of time in GC but it is making progress.  Needs investigation.
Comments
I plan to push this the next week.
11-10-2013
Stefan - do you plan to push this for 8 or should we file for deferral?
11-10-2013
Embedded: http://aurora.ru.oracle.com/functional/faces/RunDetails.xhtml?names=290074.JAVASE_EMBEDDED_PROMOTION_TESTCYCLE_8_ALL-4248 java/lang/management/MemoryMXBean/LowMemoryTest2.sh
25-09-2013
Suggested fix, after JDK-8024547 has been fixed.
23-09-2013
Coleen provided a patch, that I've slightly altered, to fix the test. However, the test will fail until JDK-8024547 has been resolved.
23-09-2013
After the Metaspace memory pools are in we can see if it's possible to make this test run properly
29-05-2013
EVALUATION It appears that the test is trying to load classes in order to get a MXBean memory usage theshold notification for non-heap memory. Since the removal of the perm gen MXBean the code cache is the only non-heap MXBean with usage threshold capabilities. Thus the test loads classes until it times out or until the counter for the class names wraps around. I'd say that there's no good way to fix this test other than removing it. Trying to fill up the code cache in order to get a notification seems to be very fragile, with the test being run both with and without -Xcomp etc.
13-09-2012