gRPC Conf 2025

io_uring is an open source asynchronous syscall API for linux which allows an user to submit a syscall and receive an asynchronous completion notification. It brings some advanced features such as (1) syscall batching and chaining - the ability to batch multiple syscalls into one submission into the kernel, (2) buffer pooling - automatic selection of receive buffers from a pre-registered set of buffers to hold data read over the socket. These features can help improve performance of the gRPC-C++ stack. This talk would cover our experiences with developing an io_uring based EventEngine for gRPC-C++ and benchmarking it against the default epoll implementation.