Performance on Oracle JDK and OpenJDK
<p>I have Oracle JDK7(JavaSE Hotspot Embedded JRE) and OpenJDK7(Cacao,JamVM,ZeroVM). 
Platform is : PPC32 Embedded Platform (e550)</p>

<p>I have run simple prime number java application with both java. 
As coclusion Oracle JRE is much faster than open jdk with cacao or jamvm or zero VM.</p>

<p>I am looking to improve the execution speed with openjdk. Need the excecution time same as oracle JRE.
How can I improve the execution speed of java application (single or multithread).</p>

<p>Which are the component different in Oracle and Open JDK.    </p>