Example usage for java.lang.management ThreadMXBean isThreadContentionMonitoringEnabled

Introduction

In this page you can find the example usage for java.lang.management ThreadMXBean isThreadContentionMonitoringEnabled.

Prototype

public boolean isThreadContentionMonitoringEnabled();

Source Link

Document

Tests if thread contention monitoring is enabled.

Usage

From source file:io.pcp.parfait.benchmark.StandardMetricThroughPutBenchmark.java

public static void main(String[] args) throws InterruptedException, UnknownHostException {
    int numThreads = args.length < 1 ? Runtime.getRuntime().availableProcessors() : Integer.valueOf(args[0]);
    int numCounters = 1000;
    int iterations = 10000;

    ReportHelper.environmentReportHeader();
    ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    System.out.printf("Thread Contention Supported: %s, Enabled by default: %s\n",
            threadMXBean.isThreadContentionMonitoringSupported(),
            threadMXBean.isThreadContentionMonitoringEnabled());
    System.out.printf("numThreads: %d, numCounters=%d, iterations=%d\n", numThreads, numCounters, iterations);

    new StandardMetricThroughPutBenchmark(numThreads, numCounters, iterations, false, false).runBenchmark();
    new StandardMetricThroughPutBenchmark(numThreads, numCounters, iterations, true, false).runBenchmark();
    new StandardMetricThroughPutBenchmark(numThreads, numCounters, iterations, true, true).runBenchmark();

    // now do it all again reverse, in case there's any JVM warmup issues unfairly treating the first/last runs
    new StandardMetricThroughPutBenchmark(numThreads, numCounters, iterations, true, true).runBenchmark();
    new StandardMetricThroughPutBenchmark(numThreads, numCounters, iterations, true, false).runBenchmark();
    new StandardMetricThroughPutBenchmark(numThreads, numCounters, iterations, false, false).runBenchmark();
}

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From source file:org.apache.tajo.master.querymaster.QueryMasterRunner.java

public static void printThreadInfo(PrintWriter stream, String title) {
    ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
    final int STACK_DEPTH = 60;
    boolean contention = threadBean.isThreadContentionMonitoringEnabled();
    long[] threadIds = threadBean.getAllThreadIds();
    stream.println("Process Thread Dump: " + title);
    stream.println(threadIds.length + " active threads");
    for (long tid : threadIds) {
        ThreadInfo info = threadBean.getThreadInfo(tid, STACK_DEPTH);
        if (info == null) {
            stream.println("  Inactive");
            continue;
        }//from   www .jav  a 2s  .c om
        stream.println("Thread " + getTaskName(info.getThreadId(), info.getThreadName()) + ":");
        Thread.State state = info.getThreadState();
        stream.println("  State: " + state);
        stream.println("  Blocked count: " + info.getBlockedCount());
        stream.println("  Waited count: " + info.getWaitedCount());
        if (contention) {
            stream.println("  Blocked time: " + info.getBlockedTime());
            stream.println("  Waited time: " + info.getWaitedTime());
        }
        if (state == Thread.State.WAITING) {
            stream.println("  Waiting on " + info.getLockName());
        } else if (state == Thread.State.BLOCKED) {
            stream.println("  Blocked on " + info.getLockName());
            stream.println("  Blocked by " + getTaskName(info.getLockOwnerId(), info.getLockOwnerName()));
        }
        stream.println("  Stack:");
        for (StackTraceElement frame : info.getStackTrace()) {
            stream.println("    " + frame.toString());
        }
    }
    stream.flush();
}

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