Jens Axboe

Who is Jens Axboe?

Jens Axboe is a Linux kernel hacker. He is the current Linux kernel maintainer of the block layer and other block devices, along with contributing the CFQ I/O scheduler, Noop scheduler, Deadline scheduler and splice IO architecture. Jens is also the author of the blktrace utility and kernel parts, which provides a way to trace every block IO activity in the Linux kernel. blktrace exists in 2.6.17 and later Linux kernels.

To facilitate his block layer work in the Linux kernel, Axboe created the flexible IO tester benchmarking and workload simulation tool. FIO is able to simulate various types of I/O loads, such as synchronous, asynchronous, mmap, etc., as well as specifying the number of threads or processes, read vs. write mix, and various other parameters. FIO was used to set the world record in December 2012 for the highest number of I/Os-per-second in a single system.