Example usage for java.lang.management MemoryPoolMXBean isUsageThresholdSupported

Introduction

In this page you can find the example usage for java.lang.management MemoryPoolMXBean isUsageThresholdSupported.

Prototype

public boolean isUsageThresholdSupported();

Source Link

Document

Tests if this memory pool supports usage threshold.

Usage

From source file:org.apache.pig.impl.util.SpillableMemoryManager.java

private SpillableMemoryManager() {
    ((NotificationEmitter) ManagementFactory.getMemoryMXBean()).addNotificationListener(this, null, null);
    List<MemoryPoolMXBean> mpbeans = ManagementFactory.getMemoryPoolMXBeans();
    long totalSize = 0;
    for (MemoryPoolMXBean pool : mpbeans) {
        log.debug("Found heap (" + pool.getName() + ") of type " + pool.getType());
        if (pool.getType() == MemoryType.HEAP) {
            long size = pool.getUsage().getMax();
            totalSize += size;/*from www.  jav a2  s . c  om*/
            // CMS Old Gen or "tenured" is the only heap that supports
            // setting usage threshold.
            if (pool.isUsageThresholdSupported()) {
                tenuredHeap = pool;
            }
        }
    }
    extraGCSpillSizeThreshold = (long) (totalSize * extraGCThresholdFraction);
    if (tenuredHeap == null) {
        throw new RuntimeException("Couldn't find heap");
    }

    configureMemoryThresholds(MEMORY_THRESHOLD_FRACTION_DEFAULT, COLLECTION_THRESHOLD_FRACTION_DEFAULT,
            UNUSED_MEMORY_THRESHOLD_DEFAULT);

}

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From source file:org.toobsframework.management.MemoryMonitor.java

private void init() {
    MemoryMXBean mem = ManagementFactory.getMemoryMXBean();
    ((NotificationBroadcaster) mem).addNotificationListener(listener, null, null);

    for (MemoryPoolMXBean memPool : ManagementFactory.getMemoryPoolMXBeans()) {
        if (memPool.isUsageThresholdSupported()) {
            memPools.put(memPool.getName(), memPool);
            log.info("Putting Pool " + memPool.getName());
            setUsageThreshold(memPool, 0.7);
        }//from w  w  w  .j av a 2  s  . c  o m
    }
}

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