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Fio README
Overview and history
Fio was originally written to save me the hassle of writing special test case programs when I wanted to test a specific workload, either for performance reasons or to find/reproduce a bug. The process of writing such a test app can be tiresome, especially if you have to do it often. Hence I needed a tool that would be able to simulate a given I/O workload without resorting to writing a tailored test case again and again.
A test work load is difficult to define, though. There can be any number of processes or threads involved, and they can each be using their own way of generating I/O. You could have someone dirtying large amounts of memory in a memory mapped file, or maybe several threads issuing reads using asynchronous I/O. fio needed to be flexible enough to simulate both of these cases, and many more.
Fio spawns a number of threads or processes doing a particular type of I/O action as specified by the user. fio takes a number of global parameters, each inherited by the thread unless otherwise parameters given to them overriding that setting is given. The typical use of fio is to write a job file matching the I/O load one wants to simulate.
Source
Fio resides in a git repo, the canonical place is:
git://git.kernel.dk/fio.git
When inside a corporate firewall, git:// URL sometimes does not work.
If git:// does not work, use the http protocol instead:
http://git.kernel.dk/fio.git
Snapshots are frequently generated and :file:fio-git-*.tar.gz include the git
meta data as well. Other tarballs are archives of official fio releases.
Snapshots can download from:
http://brick.kernel.dk/snaps/
There are also two official mirrors. Both of these are automatically synced with the main repository, when changes are pushed. If the main repo is down for some reason, either one of these is safe to use as a backup:
git://git.kernel.org/pub/scm/linux/kernel/git/axboe/fio.git
https://git.kernel.org/pub/scm/linux/kernel/git/axboe/fio.git
or
git://github.com/axboe/fio.git
https://github.com/axboe/fio.git
Mailing list
The fio project mailing list is meant for anything related to fio including general discussion, bug reporting, questions, and development. For bug reporting, see REPORTING-BUGS.
An automated mail detailing recent commits is automatically sent to the list at most daily. The list address is fio@vger.kernel.org, subscribe by sending an email to majordomo@vger.kernel.org with
subscribe fio
in the body of the email. Archives can be found here:
http://www.spinics.net/lists/fio/
or here:
https://lore.kernel.org/fio/
and archives for the old list can be found here:
http://maillist.kernel.dk/fio-devel/
Author
Fio was written by Jens Axboe axboe@kernel.dk to enable flexible testing of the Linux I/O subsystem and schedulers. He got tired of writing specific test applications to simulate a given workload, and found that the existing I/O benchmark/test tools out there weren't flexible enough to do what he wanted.
Jens Axboe axboe@kernel.dk 20060905
Binary packages
Debian: Starting with Debian "Squeeze", fio packages are part of the official Debian repository. http://packages.debian.org/search?keywords=fio .
Ubuntu: Starting with Ubuntu 10.04 LTS (aka "Lucid Lynx"), fio packages are part of the Ubuntu "universe" repository. http://packages.ubuntu.com/search?keywords=fio .
Red Hat, Fedora, CentOS & Co: Starting with Fedora 9/Extra Packages for Enterprise Linux 4, fio packages are part of the Fedora/EPEL repositories. https://apps.fedoraproject.org/packages/fio .
Mandriva:
Mandriva has integrated fio into their package repository, so installing
on that distro should be as easy as typing urpmi fio.
Arch Linux: An Arch Linux package is provided under the Community sub-repository: https://www.archlinux.org/packages/?sort=&q=fio
Solaris:
Packages for Solaris are available from OpenCSW. Install their pkgutil
tool (http://www.opencsw.org/get-it/pkgutil/) and then install fio via
pkgutil -i fio.
Windows: Rebecca Cran rebecca@bsdio.com has fio packages for Windows at https://bsdio.com/fio/ . The latest builds for Windows can also be grabbed from https://ci.appveyor.com/project/axboe/fio by clicking the latest x86 or x64 build, then selecting the ARTIFACTS tab.
BSDs: Packages for BSDs may be available from their binary package repositories. Look for a package "fio" using their binary package managers.
Building
Just type::
./configure
make
make install
Note that GNU make is required. On BSDs it's available from devel/gmake within
ports directory; on Solaris it's in the SUNWgmake package. On platforms where
GNU make isn't the default, type gmake instead of make.
Configure will print the enabled options. Note that on Linux based platforms, the libaio development packages must be installed to use the libaio engine. Depending on distro, it is usually called libaio-devel or libaio-dev.
For gfio, gtk 2.18 (or newer), associated glib threads, and cairo are required
to be installed. gfio isn't built automatically and can be enabled with a
--enable-gfio option to configure.
To build fio with a cross-compiler::
make clean
make CROSS_COMPILE=/path/to/toolchain/prefix
Configure will attempt to determine the target platform automatically.
It's possible to build fio for ESX as well, use the --esx switch to
configure.
Windows
The minimum versions of Windows for building/runing fio are Windows 7/Windows
Server 2008 R2. On Windows, Cygwin (https://www.cygwin.com/) is required in
order to build fio. To create an MSI installer package install WiX from
https://wixtoolset.org and run :file:dobuild.cmd from the :file:os/windows
directory.
How to compile fio on 64-bit Windows:
- Install Cygwin (http://www.cygwin.com/). Install make and all packages starting with mingw64-x86_64. Ensure mingw64-x86_64-zlib are installed if you wish to enable fio's log compression functionality.
- Open the Cygwin Terminal.
- Go to the fio directory (source files).
- Run
make clean && make -j.
To build fio for 32-bit Windows, ensure the -i686 versions of the previously
mentioned -x86_64 packages are installed and run ./configure --build-32bit-win before make.
It's recommended that once built or installed, fio be run in a Command Prompt or other 'native' console such as console2, since there are known to be display and signal issues when running it under a Cygwin shell (see https://github.com/mintty/mintty/issues/56 and https://github.com/mintty/mintty/wiki/Tips#inputoutput-interaction-with-alien-programs for details).
Documentation
Fio uses Sphinx_ to generate documentation from the reStructuredText_ files.
To build HTML formatted documentation run make -C doc html and direct your
browser to :file:./doc/output/html/index.html. To build manual page run
make -C doc man and then man doc/output/man/fio.1. To see what other
output formats are supported run make -C doc help.
.. _reStructuredText: http://www.sphinx-doc.org/rest.html
.. _Sphinx: http://www.sphinx-doc.org
Platforms
Fio works on (at least) Linux, Solaris, AIX, HP-UX, OSX, NetBSD, OpenBSD, Windows, FreeBSD, and DragonFly. Some features and/or options may only be available on some of the platforms, typically because those features only apply to that platform (like the solarisaio engine, or the splice engine on Linux).
Some features are not available on FreeBSD/Solaris even if they could be implemented, I'd be happy to take patches for that. An example of that is disk utility statistics and (I think) huge page support, support for that does exist in FreeBSD/Solaris.
Fio uses pthread mutexes for signalling and locking and some platforms do not support process shared pthread mutexes. As a result, on such platforms only threads are supported. This could be fixed with sysv ipc locking or other locking alternatives.
Other *BSD platforms are untested, but fio should work there almost out of the box. Since I don't do test runs or even compiles on those platforms, your mileage may vary. Sending me patches for other platforms is greatly appreciated. There's a lot of value in having the same test/benchmark tool available on all platforms.
Note that POSIX aio is not enabled by default on AIX. Messages like these::
Symbol resolution failed for /usr/lib/libc.a(posix_aio.o) because:
Symbol _posix_kaio_rdwr (number 2) is not exported from dependent module /unix.
indicate one needs to enable POSIX aio. Run the following commands as root::
# lsdev -C -l posix_aio0
posix_aio0 Defined Posix Asynchronous I/O
# cfgmgr -l posix_aio0
# lsdev -C -l posix_aio0
posix_aio0 Available Posix Asynchronous I/O
POSIX aio should work now. To make the change permanent::
# chdev -l posix_aio0 -P -a autoconfig='available'
posix_aio0 changed
Running fio
Running fio is normally the easiest part - you just give it the job file (or job files) as parameters::
$ fio [options] [jobfile] ...
and it will start doing what the jobfile tells it to do. You can give more
than one job file on the command line, fio will serialize the running of those
files. Internally that is the same as using the :option:stonewall parameter
described in the parameter section.
If the job file contains only one job, you may as well just give the parameters
on the command line. The command line parameters are identical to the job
parameters, with a few extra that control global parameters. For example, for
the job file parameter :option:iodepth=2 <iodepth>, the mirror command line
option would be :option:--iodepth 2 <iodepth> or :option:--iodepth=2 <iodepth>. You can also use the command line for giving more than one job
entry. For each :option:--name <name> option that fio sees, it will start a
new job with that name. Command line entries following a
:option:--name <name> entry will apply to that job, until there are no more
entries or a new :option:--name <name> entry is seen. This is similar to the
job file options, where each option applies to the current job until a new []
job entry is seen.
fio does not need to run as root, except if the files or devices specified in the job section requires that. Some other options may also be restricted, such as memory locking, I/O scheduler switching, and decreasing the nice value.
If jobfile is specified as -, the job file will be read from standard
input.