axboe/liburing
Liburing
liburing is a C library that provides a low-level wrapper for the Linux kernel io_uring interface. It serves as a programming interface for executing non-blocking disk and network operations and abstracts the system calls required to communicate with the Linux kernel.
The library focuses on reducing system call overhead and context switching for high-throughput data processing. It implements mechanisms for shared ring buffers, zero-copy buffer registration, and fixed-file descriptor mapping to minimize internal lookup and reference counting overhead.
The project covers asynchronous input and output management for both network programming and disk operations. It utilizes submission queue polling and completion queue event-loops to handle concurrent tasks without blocking.
Features
- io_uring Async IO - Serves as a low-level wrapper for the Linux io_uring interface to perform high-performance asynchronous system calls.
- Disk IO Optimization - Provides asynchronous disk I/O operations to maximize throughput and prevent application blocking on hardware latency.
- Kernel-Userspace Shared Memory - Implements shared memory regions between user space and kernel space to exchange IO requests and completions without copying.
- Asynchronous I/O Libraries - Provides a high-level interface for executing non-blocking system I/O operations via kernel ring buffers.
- High-Performance System IO Libraries - Implements a high-performance C library designed to minimize system call overhead for high-throughput data processing.
- Kernel API Wrappers - Provides a set of helper functions that abstract the complex system calls required to communicate with the Linux kernel.
- Unified IO Interfaces - Provides a unified programming interface for executing non-blocking disk and network operations.
- User-Space Submission Rings - Manages a circular submission ring in user space to efficiently stage and send requests to the kernel.
- Asynchronous Network Programming - Enables high-concurrency network programming by handling multiple socket operations asynchronously without blocking.
- System Call Optimizations - Reduces context switching overhead by batching system operations through shared ring buffers.
- Submission Queue Polling - Enables the kernel to poll for new submission queue entries, eliminating the need for frequent system calls.
- Completion Queue Polling - Implements a completion queue event-loop to monitor and notify the application of finished asynchronous operations.
- Fixed Descriptor Registration - Provides fixed-file descriptor mapping to reduce internal lookup and reference counting overhead during I/O.
- Zero-Copy Buffers - Supports zero-copy buffer registration to eliminate data copying during transfers between user and kernel space.
