Direct I/O
Direct I/O is a method of performing input/output operations in computing where data is transferred directly between a user-space application and a storage device, bypassing the operating system's page cache. This approach is used to avoid the overhead of caching and buffering, providing more predictable performance and control over data management. It is particularly relevant in high-performance computing, database systems, and applications requiring large, sequential data transfers.
Developers should use Direct I/O when building applications that handle large datasets or require consistent, low-latency I/O performance, such as in database management systems (e.g., MySQL, PostgreSQL), big data processing frameworks (e.g., Hadoop), or scientific computing. It is beneficial in scenarios where caching is inefficient, such as when data is not reused or when the application manages its own caching layer, as it reduces memory usage and avoids cache pollution.