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POincrementAndGet method of AtomicLong is blocking call?
 

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  1. POincrementAndGet method of AtomicLong is blocking call?
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    <p>I am working on <code>Multithreaded code</code> from which I am trying to measure how much time a particular method is taking as I am trying to benchmark most of our teammate codes as I am doing <code>Load and Performance</code> testing of our <code>Client code</code> and then our <code>Service code</code>.</p> <p>So for this performance measurement, I am using-</p> <p><code>System.nanoTime();</code></p> <p>And I am having Multithreaded code from which I am spawning multiple threads and trying to measure how much time that code is taking.</p> <p>Below is the sample example by which I am trying to measure the performance of any code- In the below code I am trying to measure-</p> <p><code>beClient.getAttributes method</code></p> <p>Below is the code-</p> <pre><code>public class BenchMarkTest { public static void main(String[] args) { ExecutorService executor = Executors.newFixedThreadPool(5); try { for (int i = 0; i &lt; 3 * 5; i++) { executor.submit(new ThreadTask(i)); } executor.shutdown(); executor.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS); } catch (InterruptedException e) { } } } </code></pre> <p>Below is the class that implements Runnable interface</p> <pre><code>class ThreadTask implements Runnable { private int id; public static ConcurrentHashMap&lt;Long, AtomicLong&gt; selectHistogram = new ConcurrentHashMap&lt;Long, AtomicLong&gt;(); public ThreadTask(int id) { this.id = id; } @Override public void run() { long start = System.nanoTime(); attributes = beClient.getAttributes(columnsList); long end = System.nanoTime() - start; final AtomicLong before = selectHistogram.putIfAbsent(end / 1000000L, new AtomicLong(1L)); if (before != null) { before.incrementAndGet(); } } } </code></pre> <p>Whatever code I want to measure, I usually put the below line just above that method</p> <p><code>long start = System.nanoTime();</code></p> <p>And these two lines after the same method but with different <code>ConcurrentHashMap</code></p> <pre><code>long end = System.nanoTime() - start; final AtomicLong before = selectHistogram.putIfAbsent(end / 1000000L, new AtomicLong(1L)); if (before != null) { before.incrementAndGet(); } </code></pre> <p>Today I had the meeting with one of my senior folks and he said <code>incrementAndGet</code> method of <code>ConcurrentHashMap</code> is a blocking call. So your thread will be waiting for some time there. </p> <p>And he asked me to make that <code>Asynchronous call</code>.</p> <p>Is there any possibility of making that Asynchronous call?</p> <p>Because in all our client code and service code to measure the performance of each method, I am using the same above three lines that I usually put before and after each method to measure the performance of those method. And after the program finishes, I am printing it out the result from those maps.</p> <p>So now I am thinking of making that <code>Asynchronous call</code>? Can anyone help me to do that?</p> <p><strong>Basically, I am trying to measure the performance of a particular method in an asynchronous manner so that each thread won't wait and gets blocked.</strong></p> <p>I think, I can do this using <code>Futures</code>. Can anyone provide an example related to that?</p> <p>Thanks for the help.</p>
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    1. COI got confused here, incrementAndGet is not a method of `ConcurrentHashMap`, instead of it's a method of `AtomicLong`. So is this your question?
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      1. USNándor Krácser
    2. COYeah. I messed up somehow. Just update the question with changes.
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      1. USarsenal
    3. CO@TechGeeky I did an update to the answer, may improve your code's performance. Check it out and use it if you like. Cheers.
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      1. USacdcjunior
 

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