-64
The -d64 option means to use the 64-bit version of the JVM. The JVM has three basic configurations: -client, -server (both for 32-bit JVMs) and -d64. In order to use -d64, you have to separately install the 64-bit JVM for your platform (see, e.g., http://java.sun.com/javase/6/webnotes/install/system-configurations.html for supported platforms; the option itself is documented in the online man pages for the java tool).
Cited from https://www.java.net/node/674019
-Xms and -Xmx
The flag Xmx specifies maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms is specifies the initial memory allocation pool.
That means your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of memory.
For example, starting a JVM like so will start it with 256MB of memory, and will allow the process to use up to 2048MB of memory: java -Xmx2048m -Xms256m
Cited from http://stackoverflow.com/questions/14763079/what-are-the-xms-and-xmx-parameters-when-starting-jvms
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