Examples with GarbageCollectorMXBean java.lang.management.GarbageCollectorMXBean used on opensource projects

Example 56 with GarbageCollectorMXBean

use of java.lang.management.GarbageCollectorMXBean in project phoenix by apache.

the class GarbageCollectorElapsedTimeMonitor method getStat.

@Override
public Stat getStat() {
    List<GarbageCollectorMXBean> beans = ManagementFactory.getGarbageCollectorMXBeans();
    long average = 0;
    Stat<Long> stat = null;
    if (beans.size() > 0) {
        for (GarbageCollectorMXBean bean : beans) {
            average += bean.getCollectionTime();
        }
        stat = new Stat(average / beans.size());
    } else {
        stat = new Stat(0);
    }
    return stat;
}

Example 57 with GarbageCollectorMXBean

use of java.lang.management.GarbageCollectorMXBean in project voltdb by VoltDB.

the class GCInspector method logGCResults.

private void logGCResults() {
    for (GarbageCollectorMXBean gc : beans) {
        Long previousTotal = gctimes.get(gc.getName());
        Long total = gc.getCollectionTime();
        if (previousTotal == null)
            previousTotal = 0L;
        if (previousTotal.equals(total))
            continue;
        gctimes.put(gc.getName(), total);
        // may be zero for a really fast collection
        Long duration = total - previousTotal;
        Long previousCount = gccounts.get(gc.getName());
        Long count = gc.getCollectionCount();
        if (previousCount == null)
            previousCount = 0L;
        if (count.equals(previousCount))
            continue;
        gccounts.put(gc.getName(), count);
        MemoryUsage mu = membean.getHeapMemoryUsage();
        long memoryUsed = mu.getUsed();
        long memoryMax = mu.getMax();
        long durationPerCollection = duration / (count - previousCount);
        if (durationPerCollection > MIN_DURATION) {
            String st = String.format("GC for %s: %s ms for %s collections, %s used; max is %s", gc.getName(), duration, count - previousCount, memoryUsed, memoryMax);
            logger.info(st);
        } else if (logger.isDebugEnabled()) {
            String st = String.format("GC for %s: %s ms for %s collections, %s used; max is %s", gc.getName(), duration, count - previousCount, memoryUsed, memoryMax);
            logger.debug(st);
        }
        // if we just finished a full collection and we're still using a lot of memory, log
        if (newGenGCs.contains(gc.getName())) {
            m_voltGcStats.gcInspectorReport(true, (int) (count - previousCount), duration);
        }
        if (oldGenGCs.contains(gc.getName())) {
            m_voltGcStats.gcInspectorReport(false, (int) (count - previousCount), duration);
            if (memoryUsed > .5 * memoryMax) {
                double usage = (double) memoryUsed / memoryMax;
                String usageStr = String.format("%.2f", usage * 100);
                //2^20 Bytes
                String memoryMaxStr = String.format("%.2f", (double) memoryMax / 1_048_576);
                if (.5 <= usage && usage < .6) {
                    logger.info("Heap is " + usageStr + "% full out of " + memoryMaxStr + "MB.");
                } else if (.6 <= usage) {
                    logger.warn("Heap is " + usageStr + "% full out of " + memoryMaxStr + "MB.");
                }
            }
        }
    }
}

Example 58 with GarbageCollectorMXBean

use of java.lang.management.GarbageCollectorMXBean in project leopard by tanhaichao.

the class JvmManagement method printGC.

public static void printGC() {
    System.out.println("=======================MemoryPoolMXBean============================ ");
    List<GarbageCollectorMXBean> gcmList = ManagementFactory.getGarbageCollectorMXBeans();
    for (GarbageCollectorMXBean gcm : gcmList) {
        System.out.println("getName " + gcm.getName() + " count:" + gcm.getCollectionCount() + " time:" + gcm.getCollectionTime());
    // System.out.println("getMemoryPoolNames " + gcm.getMemoryPoolNames());
    }
}

Example 59 with GarbageCollectorMXBean

use of java.lang.management.GarbageCollectorMXBean in project Payara by payara.

the class GarbageCollectorHealthCheck method doCheck.

@Override
public HealthCheckResult doCheck() {
    HealthCheckResult result = new HealthCheckResult();
    List<GarbageCollectorMXBean> gcBeanList = ManagementFactory.getGarbageCollectorMXBeans();
    for (GarbageCollectorMXBean gcBean : gcBeanList) {
        double percentage = 0;
        if (YOUNG_PS_SCAVENGE.equals(gcBean.getName()) || YOUNG_G1GC.equals(gcBean.getName()) || YOUNG_COPY.equals(gcBean.getName()) || YOUNG_PARNEW.equals(gcBean.getName())) {
            long diffCount = gcBean.getCollectionCount() - youngLastCollectionCount;
            long diffTime = gcBean.getCollectionTime() - youngLastCollectionTime;
            if (diffTime > 0 && youngLastCollectionCount > 0) {
                percentage = ((diffCount) / (youngLastCollectionCount)) * 100;
                result.add(new HealthCheckResultEntry(decideOnStatusWithRatio(percentage), diffCount + " times Young GC (" + gcBean.getName() + ") after " + prettyPrintDuration(diffTime)));
            }
            youngLastCollectionCount = gcBean.getCollectionCount();
            youngLastCollectionTime = gcBean.getCollectionTime();
        } else if (OLD_PS_MARKSWEEP.equals(gcBean.getName()) || OLD_G1GC.equals(gcBean.getName()) || OLD_MARK_SWEEP_COMPACT.equals(gcBean.getName()) || OLD_CONCURRENTMARKSWEEP.equals(gcBean.getName())) {
            long diffCount = gcBean.getCollectionCount() - oldLastCollectionCount;
            long diffTime = gcBean.getCollectionTime() - oldLastCollectionTime;
            if (diffTime > 0 && oldLastCollectionCount > 0) {
                percentage = ((diffCount) / (oldLastCollectionCount)) * 100;
                result.add(new HealthCheckResultEntry(decideOnStatusWithRatio(percentage), diffCount + " times Old GC (" + gcBean.getName() + ") after " + prettyPrintDuration(diffTime)));
            }
            oldLastCollectionCount = gcBean.getCollectionCount();
            oldLastCollectionTime = gcBean.getCollectionTime();
        } else {
            result.add(new HealthCheckResultEntry(HealthCheckResultStatus.CHECK_ERROR, "Could not identify " + "GarbageCollectorMXBean with name: " + gcBean.getName()));
        }
    }
    return result;
}

Example 60 with GarbageCollectorMXBean

use of java.lang.management.GarbageCollectorMXBean in project Payara by payara.

the class MemoryReporter method getGarbageCollectionReport.

private String getGarbageCollectionReport() {
    final StringBuilderNewLineAppender sb = new StringBuilderNewLineAppender(new StringBuilder());
    for (final GarbageCollectorMXBean m : gcmbeans) {
        final String name = sm.getString("gc.name", m.getName());
        sb.append(name);
        final String cc = sm.getString("gc.numcol", JVMInformationCollector.formatLong(m.getCollectionCount()));
        sb.append(cc);
        final String gct = sm.getString("gc.coltime", JVMInformationCollector.millis2SecondsMillis(m.getCollectionTime()));
        sb.append(gct);
    }
    return (sb.toString());
}