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    <p>With this version of java -XX:+DoEscapeAnalysis results in far less gc activity and 14x faster execution.</p> <pre><code>$ java -version java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing) $ uname -a Linux xxx 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686 GNU/Linux </code></pre> <p>Without escape analysis,</p> <pre><code>$ java -server -verbose:gc EscapeAnalysis|cat -n 1 start 2 [GC 896K-&gt;102K(5056K), 0.0053480 secs] 3 [GC 998K-&gt;102K(5056K), 0.0012930 secs] 4 [GC 998K-&gt;102K(5056K), 0.0006930 secs] --snip-- 174 [GC 998K-&gt;102K(5056K), 0.0001960 secs] 175 [GC 998K-&gt;102K(5056K), 0.0002150 secs] 176 10000000 </code></pre> <p>With escape analysis,</p> <pre><code>$ java -server -verbose:gc -XX:+DoEscapeAnalysis EscapeAnalysis start [GC 896K-&gt;102K(5056K), 0.0055600 secs] 10000000 </code></pre> <p>The execution time reduces significantly with escape analysis. For this the loop was changed to 10e9 iterations,</p> <pre><code>public static void main(String [] args){ System.out.println("start"); for(int i = 0; i &lt; 1000*1000*1000; ++i){ Foo foo = new Foo(); } System.out.println(Foo.counter); } </code></pre> <p>Without escape analysis,</p> <pre><code>$ time java -server EscapeAnalysis start 1000000000 real 0m27.386s user 0m24.950s sys 0m1.076s </code></pre> <p>With escape analysis,</p> <pre><code>$ time java -server -XX:+DoEscapeAnalysis EscapeAnalysis start 1000000000 real 0m2.018s user 0m2.004s sys 0m0.012s </code></pre> <p>So with escape analysis the example ran about 14x faster than the non-escape analysis run.</p>
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    1. POEscape analysis in Java
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    1. COIf you run "java -server" then you should use "java -server -version" to see its version, not just "java -version".
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    2. COThis works great. Should be the accepted answer
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