Vladimir Ershov created IGNITE-2616:
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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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