fio For Linux

fio is an I/O tool meant to be used both for benchmark and stress/hardware verification.

fio supports for 4 different types of I/O engines: sync, mmap, libaio, posixaio, rate I/O, I/O priorities, forked or threaded jobs, and much more.

 fio

-s IO is sequential -b block size in KiB for each io -t < sec > Runtime in seconds -r For random io, sequence must be repeatable -R < on > If one thread fails to meet rate, quit all -o < on > Use direct IO is 1, buffered if 0 -l Generate per-job latency logs -w Generate per-job bandwidth logs -f < file > Read < file > for job descriptions

A sample job file doing the same as above looks like this:

[read_file] rw=0 bs=4096

[write_file] rw=1 bs=16384

And fio would be invoked as:

 fio -o1 -s -f file_with_above

The second example would look like this: [rf1] rw=0 prio=6

[rf3] rw=0 prio=0 direct=1

And fio would be invoked as:

 fio -o0 -s -b4096 -f file_with_above