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With modern servers, a lot of people are migrating to 64-bit architectures. Apparently, there are performance considerations in regards to using a 64-bit JVM. If you are using/considering installing a 64-bit JVM, you might want to read up on compressed oops (ordinary object pointers) — don’t worry, we are only talking about JVM command line options which affect performance. Please visit the links below:

http://www.lowtek.ca/roo/2008/java-performance-in-64bit-land/
http://blog.juma.me.uk/2008/10/14/32-bit-or-64-bit-jvm-how-about-a-hybrid/
http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/index.jsp?topic=/com.ibm.java.doc.user.lnx.60/user/garbage_compressed_refs.html

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