File Mapping
File mapping is a technique in computing that allows a process to map a file or a portion of a file into its virtual address space, enabling direct memory access to the file's contents as if it were an array in memory. This is commonly implemented through operating system APIs like memory-mapped files in Windows or mmap in Unix-like systems. It provides efficient I/O operations by reducing the need for explicit read/write system calls and can facilitate inter-process communication when shared between processes.
Developers should learn file mapping for high-performance applications that require fast, random access to large files, such as database systems, image processing, or real-time data analysis, as it minimizes disk I/O overhead. It is also useful for implementing shared memory in multi-process architectures, enabling efficient data exchange without serialization. Use cases include memory-mapped databases (e.g., SQLite), virtual memory management, and caching mechanisms in server applications.