Pushing Linux File I/O Performance to the Limit with Zig and io_uring

This post explores maximizing file I/O performance on Linux using Zig and io_uring. A custom Zig implementation is benchmarked against fio, achieving write speeds of 3.802 GB/s and read speeds of 6.996 GB/s—slightly slower than fio's 4.083 GB/s write and 7.33 GB/s read speeds but still within expected ranges. The author details crucial implementation techniques, including polled I/O, registered buffers, and the SQ_THREAD_POLL feature, all significantly impacting performance. While marginally slower than fio, the Zig code's performance is remarkably close, and its runtime almost exactly matches fio's, suggesting minor differences in bandwidth measurement.