What is Java?
Developed in the mid-1990s, Java is a popular programming language that is used to develop software for multiple platforms. The specialty of a code written in Java is that the code that is compiled from the source code can run on most popular operating systems like Mac OS, Linux, Windows, and so on. The syntax of Java is almost similar to C and C++, with minor variations.
Java is mainly used to develop programs that are able to run on browsers. These help in making rich and interactive Graphical User Interfaces (GUI). Before Java, webpages were mostly static without any graphics. Now, Java is slowly being phased out for the purpose of building GUI based browser apps, and other technologies like adobe flash are taking over. Though this is happening, many critical program interfaces are still being built using Java.
Developing programs in Java requires an SDK (Software development Kit). This kit contains three main things: a compiler to compile the source code, an interpreter, and a document generator. Along with these, there might be other tools as well that help coders develop java code. Java has become so important that computer science engineers all over the world still learn it and write code with it. Most universities still teach it as an important subject to understand the art of programming.
What is 32-bit architecture and 64-bit architecture?
In 32-bit operating systems, there is 4096 MB of RAM that is available for use. Technically speaking, you can allocate about 4 GB per process. When it comes to the Windows Operating system, the OS divides the allocated process address space into two halves. The first half of the process address will be reserved for the operating system to use itself. This essentially means that this space cannot be used by any other process. The second half of the allocated process address is for any user processes.
Also, the address space that is allocated to the user process has to be contagious; this means that in reality, you are left with only about 1.6 GB to 1.8 GB of heap space left on the Windows OS. Also, the Basic Input Output System (BIOS) will be occupying some of the space in this heap. This means that at the end of all considerations, you are left with only about 1.5 GB of usable space for your process.
Why are 64 bits better?
When it comes to 64-bit system architecture, theoretically, a 64-bit system can access about 17.2 Billion Gigabytes of system memory! This is an incredible number and will look like it solves all the problems that a 32-bit architecture system had with Java; in reality, the whole thing does not work that way. In the windows operating system, especially the home editions of the OS, the memory access is still limited to 16 Gigabytes of RAM. The professional, as well as the ultimate version, can use about 192 GB of RAM each. Each application that is running on the 64-bit architecture operating system can use up to 8 TB of virtual memory.
Differences between the 32-bit Java and 64-bit Java.
• Firstly, if you are running a 32-bit OS, then you will only be able to install the 32-bit version of Java. But, if you are using a system that is based on the 64-bit architecture, then
• The 64-bit JVM (Java Virtual Machine) will be able to allocate more memory than the 32-bit JVM.
• The 64-bit JVM uses the native datatypes. These data types are better when it comes to the aspect of performance. Though they might need more space to operate, considering that in most machines these days, there is no shortage of space, this will still be a plus point for the 64-bit version of Java.
Is garbage collection an issue with the 64-bit Java?
In order to understand why there are longer garbage collection pauses, we have to understand what actually happens. When you build up a bigger eap because of the 64-bit version of Java, there is more work that has to be done by the garbage collector to process this data. When it comes to practical applications, the programmer must ensure that while he or she is building heaps that are bigger than 12 GB to 16 GB, he or she must fine-tune the process.Without measuring and properly fine-tuning the garbage collection process, you may end up with a pause that is as long as a whole minute. This problem can be easily solved by partitioning the heap and does not pose any big problem to an able coder of Java. Other ways of solving this problem are by allocating a bit of memory of the heap and also by building the project on different Java virtual machines.
Though there are some consequences of using the 64-bit Java, the pros outweigh the cons.