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From "Vladimir Ershov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-2616) NonHeap memory usage metrics don't work as expected.
Date Wed, 10 Feb 2016 10:45:18 GMT
Vladimir Ershov created IGNITE-2616:
---------------------------------------

             Summary: NonHeap memory usage metrics don't work as expected.
                 Key: IGNITE-2616
                 URL: https://issues.apache.org/jira/browse/IGNITE-2616
             Project: Ignite
          Issue Type: Bug
          Components: general
    Affects Versions: 1.5.0.final
            Reporter: Vladimir Ershov
            Priority: Minor


This simple code:
{noformat}
    public static void main(String ... args) {
        MemoryMXBean mxBean = ManagementFactory.getMemoryMXBean();
        System.out.println(mxBean.getNonHeapMemoryUsage());
        GridUnsafeMemory uMem = new GridUnsafeMemory(1024L * 1024 * 1024 * 3); //3GB
        System.out.println(mxBean.getNonHeapMemoryUsage());
        uMem.allocate(1024 * 1024 * 1024, true, false);
        System.out.println(mxBean.getNonHeapMemoryUsage());
        uMem.allocate(1024 * 1024 * 1024, true, true);
        System.out.println(mxBean.getNonHeapMemoryUsage());
    }
{noformat}
shows: 
{noformat}
init = 2555904(2496K) used = 4783352(4671K) committed = 8060928(7872K) max = -1(-1K)
init = 2555904(2496K) used = 5018704(4901K) committed = 8060928(7872K) max = -1(-1K)
init = 2555904(2496K) used = 5018960(4901K) committed = 8060928(7872K) max = -1(-1K)
init = 2555904(2496K) used = 5018960(4901K) committed = 8060928(7872K) max = -1(-1K)
{noformat}
which means: offHeap metrics are incorrect. The  problem is: Apache Ignite uses that MemoryMXBean
 for collecting metrics, thus Apache Ignite offHeap metrics are incorrect too. We should find
the way to fix this, if there are any.



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