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PODual-core CPU utilization w/ single Java thread running
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  1. PODual-core CPU utilization w/ single Java thread running
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    copied!<blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/1649402/would-a-multithreaded-java-application-exploit-a-multi-core-machine-very-well">Would a multithreaded Java application exploit a multi-core machine very well?</a> </p> </blockquote> <p>I have a plain and simple Java thread like this running on my dual-core machine (Windows XP 32bit enviroment)</p> <pre><code>public static void main(String[] strs) { long j = 0; for(long i = 0; i&lt;Long.MAX_VALUE; i++) j++; System.out.println(j); } </code></pre> <p>My expectation was that it would stick to a single CPU to fully exploit the high-speed cache(since in the loop we keep operating with local variable j, hence one CPU utiliaztion would be 100% and the other would be pretty much idle. To my suprise both of the CPUs are being utilized at around 40%~60% after the thread starts and the utilization of one CPU is slightly higher than the other.</p> <p>My question is that Is there any OS load-balancing mechanism that kicks in when out-of-balance has been detected? In my case is it possible that Windows OS found that one CPU is hitting nearly 100% and the other is almost idle so it reschedules the thread to another CPU periodically?</p> <p><img src="https://i.stack.imgur.com/rit1D.jpg" alt="enter image description here"></p> <p><strong>#EDIT1</strong> I've found a possible explanation: <a href="http://siber.cankaya.edu.tr/ozdogan/OperatingSystems/ceng328/node130.html" rel="nofollow noreferrer">http://siber.cankaya.edu.tr/ozdogan/OperatingSystems/ceng328/node130.html</a></p>
 

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