What is JVM?
A Java virtual machine is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled into Java bytecode. The JVM is detailed by a specification that formally describes what is required in a JVM implementation
When to use 64-bit JVM?
You can use 64-bit JVM to run Java applications like Minecraft, NetBeans, Eclipse, etc., This is used to reduce the frequent garbage collection and also allows you to allocate memory. As Garbage Collection takes a long pause time, it may take more time to clean up.
In 64-bit JVM, Sun PKCS#11 provider is not supported because of PKCS#11 libraries. Client JVM is not available in 64-bit JVM.
Now, see the difference between the 32-bit and 64-bit JVM.
The Difference:
32-bit JVM | 64-bit JVM |
You have less memory for heap size than in 64-bit JVM | You can specify more memory for heap size than 32-bit JVM |
It is useful for 4G connectivity. | It is useful for java applications with large heaps. |
The header size is 8 bytes | The header size is 12 bytes |
Internal references size is 4 bytes | Internal references size is 8 bytes |
Why 64-bit JVM is slower than 32-bit JVM?
Because each native pointer in the system takes up eight bytes instead of four and the loading of extra data will increase the memory usage, hence resulting in slow execution. This depends on how many pointers are loaded during the execution of the Java program.
The JVM gains some extra registers which are used to create efficient native instruction sequences. The extra registers help to increase the performance in the execution of the Java program.
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