Virtual Memory Virtual memory is a technique employed by operating systems to provide a larger virtual memory space than physically available in main memory....
Virtual memory is a technique employed by operating systems to provide a larger virtual memory space than physically available in main memory. This allows applications to run faster by sharing memory with the operating system.
Key features of virtual memory:
Address translation: Virtual addresses are converted into physical addresses by the operating system. This ensures that the application sees the desired memory location even though it is stored in a different location.
Memory protection: Virtual memory provides an extra layer of protection to ensure that different processes do not access the same memory locations. This helps prevent memory corruption and protects sensitive data.
Sharing: Multiple processes can share the same virtual address space, allowing them to access the same data without interfering with each other. This is commonly used for shared libraries and system files.
Benefits of virtual memory:
Increased memory capacity: Allows more applications to run concurrently, even if their combined memory requirements exceed the available physical memory.
Improved performance: By reducing the time spent searching for memory, virtual memory can significantly improve application performance.
Protection from memory management errors: The operating system handles memory allocation and deallocation transparently, preventing application crashes caused by memory management issues.
Examples:
A virtual memory space of 16GB is created for an application, even though only 4GB of physical memory is available.
The operating system can share the virtual memory space of multiple applications with the same physical memory.
When the application requires more memory than available in physical memory, it can be swapped out to secondary storage (e.g., hard disk) and loaded back in when needed