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POWhy is there a huge performance difference between 32 and 64 bit JDK?
 

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  1. POWhy is there a huge performance difference between 32 and 64 bit JDK?
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    <p>So I've been doing Project Euler, and I found two ways to solve Problem 57. However, there seems to be a huge difference in performance between using a 32bit JDK and a 64bit JDK. </p> <pre><code>public static int fractionSolution (int l){ int count = 0; for (int i = 1; i &lt; l; i++) { BigFraction f = iterateFraction(i).subtract(new BigFraction(1,1)); if(f.getDenominator().toString().length() &lt; f.getNumerator().toString().length()){ count++; } } return count; } public static BigFraction iterateFraction(int n){ if(n==1){ return new BigFraction(2.5); } else{ BigFraction base = new BigFraction(1,1); BigFraction two = new BigFraction(2,1); return two.add(base.divide(iterateFraction(n-1))); } } public static int patternSolution (int l){ BigInteger n = new BigInteger("3"); BigInteger d = new BigInteger("2"); int count = 0; for (int i = 1; i &lt; l; i++) { n = n.add(d.multiply(new BigInteger("2"))); d = n.subtract(d); if(n.toString().length() &gt; d.toString().length()){ count++; } } return count; } </code></pre> <p>If I run the fractionSolution on 64 bit JDK, it will take 30 seconds, but on 32bit, it will take 90 seconds. </p> <p>If I run patternSolution on 64 bit JDK, it will take about 80 ms, but on 32 bit, it will take about 40 ms. </p> <p>Why is there such a huge difference between the JDKs? Which one should I use?</p> <p>I'm using Java SE 7, JDK 1.7</p> <p>Here are screen caps of my program so you don't have to run it. <a href="http://imgur.com/elzQMi3,BxEZ1RK,lDo6YBW,rRiaelE#0" rel="nofollow">http://imgur.com/elzQMi3,BxEZ1RK,lDo6YBW,rRiaelE#0</a></p> <p>You can tell which JDK it is from the file paths.</p>
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    1. COPlease state the JDK version numbers.
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    2. COhave you made sure of other possible variables involved? eg running one in client mode and another in server mode, etc
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    3. COYep. I'm using Intellj, and I just switch between jdks in the Module Settings.
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