Zero Copy
Zero copy is a performance optimization technique in computing that eliminates unnecessary data copying between memory spaces, such as between kernel and user space or between different buffers, during I/O operations. It allows data to be transferred directly from a source to a destination without intermediate copies, reducing CPU usage, memory bandwidth consumption, and latency. This is commonly implemented in operating systems, networking stacks, and file systems to enhance efficiency in data-intensive applications.
Developers should learn and use zero copy techniques when building high-performance systems that involve heavy I/O, such as web servers, database engines, or real-time data processing pipelines, to minimize overhead and improve throughput. It is particularly valuable in scenarios like network packet processing, file transfers, or multimedia streaming where reducing CPU cycles and memory operations can lead to significant scalability gains and lower resource costs.