Examples with ConcurrentHistogram org.HdrHistogram.ConcurrentHistogram used on opensource projects

Example 1 with ConcurrentHistogram

use of org.HdrHistogram.ConcurrentHistogram in project jcog by dumbai.

the class HashedWheelTimerTest method fixedDelaySubsequentFireTest.

private void fixedDelaySubsequentFireTest(int periodMS, int count, boolean fixedDelayOrRate) throws InterruptedException {
    int warmup = count / 2;
    CountDownLatch latch = new CountDownLatch(count + warmup);
    Histogram when = new ConcurrentHistogram(1_000L, /* 1 uS */
    1_000_000_000L * 2, /* 2 Sec */
    5);
    long start = System.nanoTime();
    long[] last = { start };
    Runnable task = () -> {
        long now = System.nanoTime();
        if (latch.getCount() < count)
            when.recordValue(now - last[0]);
        last[0] = now;
        latch.countDown();
    };
    if (fixedDelayOrRate) {
        timer.scheduleWithFixedDelay(task, 0, periodMS, TimeUnit.MILLISECONDS);
    } else {
        timer.scheduleAtFixedRate(task, 0, periodMS, TimeUnit.MILLISECONDS);
    }
    assertTrue(latch.await(count * periodMS * 3, TimeUnit.MILLISECONDS), () -> latch.getCount() + " should be zero");
    assertTrue(1 >= timer.size(), () -> timer.size() + " tasks in wheel");
    {
        Histogram w = when.copy();
        Str.histogramPrint(w, System.out);
        // System.out.println("mean=" + Texts.timeStr(w.getMean()));
        // System.out.println("max=" + Texts.timeStr(w.getMaxValue()));
        long delayNS = TimeUnit.MILLISECONDS.toNanos(periodMS);
        double err = Math.abs(delayNS - w.getMean());
        assertTrue(err < delayNS / 4.0);
    }
}