Example usage for java.lang.management ThreadMXBean getCurrentThreadCpuTime

Introduction

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

Prototype

public long getCurrentThreadCpuTime();

Source Link

Document

Returns the total CPU time for the current thread in nanoseconds.

Usage

From source file:eu.planets_project.tb.gui.backing.exp.ExpTypeMigrate.java

public static void main(String args[]) {

    Properties p = System.getProperties();

    ByteArrayOutputStream byos = new ByteArrayOutputStream();
    try {/*from   w  w  w .  ja  v  a2s. c o m*/
        p.storeToXML(byos, "Automatically generated for PLANETS Service ", "UTF-8");
        String res = byos.toString("UTF-8");
        System.out.println(res);
    } catch (IOException e) {
        e.printStackTrace();
    }

    // This.
    List<String> pl = new ArrayList<String>();
    for (Object key : p.keySet()) {
        pl.add((String) key);
    }
    Collections.sort(pl);

    //
    for (String key : pl) {
        System.out.println(key + " = " + p.getProperty(key));
    }

    /*
     * http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ThreadMXBean.html#getCurrentThreadCpuTime()
     * 
     * http://www.java-forums.org/new-java/5303-how-determine-cpu-usage-using-java.html
     * 
     */

    ThreadMXBean TMB = ManagementFactory.getThreadMXBean();
    int mscale = 1000000;
    long time = 0, time2 = 0;
    long cput = 0, cput2 = 0;
    double cpuperc = -1;

    //Begin loop.
    for (int i = 0; i < 10; i++) {

        if (TMB.isThreadCpuTimeSupported()) {
            if (!TMB.isThreadCpuTimeEnabled()) {
                TMB.setThreadCpuTimeEnabled(true);
            }

            //                if(new Date().getTime() * mscale - time > 1000000000) //Reset once per second
            //                {
            System.out.println("Resetting...");
            time = System.currentTimeMillis() * mscale;
            cput = TMB.getCurrentThreadCpuTime();
            //                cput = TMB.getCurrentThreadUserTime();
            //                }

        }

        //Do cpu intensive stuff
        for (int k = 0; k < 10; k++) {
            for (int j = 0; j < 100000; j++) {
                double a = Math.pow(i, j);
                double b = a / j + Math.random();
                a = b * Math.random();
                b = a * Math.random();
            }

            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }

        if (TMB.isThreadCpuTimeSupported()) {
            //                if(new Date().getTime() * mscale - time != 0) {
            cput2 = TMB.getCurrentThreadCpuTime();
            System.out.println("cpu: " + (cput2 - cput) / (1000.0 * mscale));
            //                cput2 = TMB.getCurrentThreadUserTime();

            time2 = System.currentTimeMillis() * mscale;
            System.out.println("time: " + (time2 - time) / (1000.0 * mscale));

            cpuperc = 100.0 * (cput2 - cput) / (double) (time2 - time);
            System.out.println("cpu perc = " + cpuperc);
            //                }
        }
        //End Loop
    }
    System.out.println("Done.");
}

---

From source file:ThreadTimer.java

public static long getCurrentThreadTime() {
    ThreadMXBean tb = ManagementFactory.getThreadMXBean();
    return tb.getCurrentThreadCpuTime();
}

---

From source file:com.github.jinahya.codec.BossVsEngineerTestCpuTimeDecode.java

private static long decodeLikeABoss(final byte[] encoded) {
    final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    final long start = threadMXBean.getCurrentThreadCpuTime();
    new HexDecoder().decodeLikeABoss(encoded);
    return threadMXBean.getCurrentThreadCpuTime() - start;
}

---

From source file:com.github.jinahya.codec.BossVsEngineerTestCpuTimeDecode.java

private static long decodeLikeAnEngineer(final byte[] encoded) {
    final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    final long start = threadMXBean.getCurrentThreadCpuTime();
    new HexDecoder().decodeLikeAnEngineer(encoded);
    return threadMXBean.getCurrentThreadCpuTime() - start;
}

---

From source file:com.github.jinahya.codec.BossVsEngineerTestCpuTimeEncode.java

private static long encodeLikeABoss(final byte[] decoded) {
    final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    final long start = threadMXBean.getCurrentThreadCpuTime();
    new HexEncoder().encodeLikeABoss(decoded);
    return threadMXBean.getCurrentThreadCpuTime() - start;
}

---

From source file:com.github.jinahya.codec.BossVsEngineerTestCpuTimeEncode.java

private static long encodeLikeAnEngineer(final byte[] decoded) {
    final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    final long start = threadMXBean.getCurrentThreadCpuTime();
    new HexEncoder().encodeLikeAnEngineer(decoded);
    return threadMXBean.getCurrentThreadCpuTime() - start;
}

---

From source file:com.espertech.esper.regression.client.MyMetricFunctions.java

public static boolean takeCPUTime(long nanoSecTarget) {
    if (nanoSecTarget < 100) {
        throw new RuntimeException("CPU time wait nsec less then zero, was " + nanoSecTarget);
    }//from ww w  . ja  v  a 2  s  .  co  m

    ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
    if (!mbean.isThreadCpuTimeEnabled()) {
        throw new RuntimeException("ThreadMXBean CPU time reporting not enabled");
    }

    long before = mbean.getCurrentThreadCpuTime();

    while (true) {
        long after = mbean.getCurrentThreadCpuTime();
        long spent = after - before;
        if (spent > nanoSecTarget) {
            break;
        }
    }

    return true;
}

---

From source file:com.rest4j.impl.UtilTest.java

@Test
public void testClone() {
    Tree test = new Tree();
    test.name = StringUtils.repeat("TEST", 10000);
    test.left = new Tree();
    test.right = test.left;/*  w  w  w .j  a v a 2  s .c om*/

    ThreadMXBean threadMx = ManagementFactory.getThreadMXBean();
    long start = threadMx.getCurrentThreadCpuTime();
    int N = 10000;
    for (int i = 0; i < N; i++)
        test = Util.deepClone(test);
    System.out.println("cloned in " + (threadMx.getCurrentThreadCpuTime() - start) / N + "ns");
    assertSame(test.left, test.right);
}

---

From source file:com.thoughtworks.go.server.service.builders.KillAllChildProcessTaskBuilderTest.java

public long getSystemTime() {
    ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.isCurrentThreadCpuTimeSupported()
            ? (bean.getCurrentThreadCpuTime() - bean.getCurrentThreadUserTime())
            : 0L;/*from   w ww.  j a va 2s.co  m*/
}

---

From source file:com.twosigma.beakerx.kernel.magic.command.functionality.TimeMagicCommand.java

public MagicCommandOutput time(String codeToExecute, Message message, int executionCount, boolean showResult) {
    CompletableFuture<TimeMeasureData> compileTime = new CompletableFuture<>();

    ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    long currentThreadId = Thread.currentThread().getId();

    Long startWallTime = System.nanoTime();
    Long startCpuTotalTime = threadMXBean.getCurrentThreadCpuTime();
    Long startUserTime = threadMXBean.getCurrentThreadUserTime();

    SimpleEvaluationObject simpleEvaluationObject = createSimpleEvaluationObject(codeToExecute, kernel, message,
            executionCount);//from   w w w .  java2 s .  co  m
    if (!showResult) {
        simpleEvaluationObject.noResult();
    }

    TryResult either = kernel.executeCode(codeToExecute, simpleEvaluationObject);

    Long endWallTime = System.nanoTime();
    Long endCpuTotalTime = threadMXBean.getThreadCpuTime(currentThreadId);
    Long endUserTime = threadMXBean.getThreadUserTime(currentThreadId);

    compileTime.complete(new TimeMeasureData(endCpuTotalTime - startCpuTotalTime, endUserTime - startUserTime,
            endWallTime - startWallTime));
    String messageInfo = "CPU times: user %s, sys: %s, total: %s \nWall Time: %s\n";

    try {
        TimeMeasureData timeMeasuredData = compileTime.get();

        return new MagicCommandOutput(MagicCommandOutput.Status.OK,
                String.format(messageInfo, format(timeMeasuredData.getCpuUserTime()),
                        format(timeMeasuredData.getCpuTotalTime() - timeMeasuredData.getCpuUserTime()),
                        format(timeMeasuredData.getCpuTotalTime()), format(timeMeasuredData.getWallTime())),
                either, simpleEvaluationObject);

    } catch (InterruptedException | ExecutionException e) {
        return new MagicCommandOutput(MagicCommandOutput.Status.ERROR,
                "There occurs problem during measuring time for your statement.");
    }
}

---

• «
• 1
• 2
• »