Unbuffered I/O
Unbuffered I/O is a method of input/output operations where data is transferred directly between a program and a device or file without using an intermediate buffer in memory. This means each read or write call results in an immediate system-level operation, bypassing caching mechanisms. It is often used in scenarios where low latency, real-time data handling, or direct hardware interaction is required.
Developers should use unbuffered I/O when they need precise control over data timing, such as in real-time systems, device drivers, or logging applications where data must be written immediately to ensure integrity. It is also useful for avoiding buffer overhead in high-performance computing or when dealing with large files where caching might cause memory issues. However, it can be less efficient for bulk data transfers compared to buffered I/O due to increased system call overhead.