fio 1.17

fio is an I/O tool meant to be used both for benchmark and stress/hardware verification.
fio project has support for 4 different types of I/O engines (sync, mmap, libaio, posixaio), I/O priorities (for newer Linux kernels), rate I/O, forked or threaded jobs, and much more. It can work on block devices as well as files.
fio accepts job descriptions in a simple-to-understand text format. Several example job files are included. fio displays all sorts of I/O performance information, such as completion and submission latencies (avg/mean/deviation), bandwidth stats, cpu and disk utilization, and more.
Options:
$ 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
Examples using a job file:
A sample job file doing the same as above would look 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
[rf2]
rw=0
prio=3
[rf3]
rw=0
prio=0
direct=1
And fio would be invoked as:
$ fio -o0 -s -b4096 -f file_with_above
global is a reserved keyword. When used as the filename, it sets the default options for the threads following that section. It is possible to have more than one global section in the file, as it only affects subsequent jobs.
Enhancements:
- Support for replaying blktrace logs, full splice support (network and normal), adaptive latency histograms, many data verification improvements and additions, and many bugfixes and improvements.