:PROPERTIES: :ID: b6f5b357-3ecb-454f-866a-7770e1034638 :mtime: 20240319060755 :ctime: 20240319060754 :END: #+title: Vectored IO #+filetags: :operatingsystems:public:project: * Vectored IO ** Definition of Vectored IO - Enable one system call to perform multiple I/O operations ** Reasons to use Vectored IO - Decreases context switching and system call overhead - This scatter-gather method better than multiple individual I/O calls ** Example of Vectored IO E.g., Unix readve accepts a vector of multiple buffers to read into or write from ** Atomicity - Some versions provide atomicity - In other words, if one operation fails, all operations must fail. - Avoids, e.g., worry about multiple threads changing data while I/O occurring