Fio which stands for Flexible I/O Tester [is a free and open source][1] disk I/O tool used both for benchmark and stress/hardware verification developed by Jens Axboe.
It has support for 19 different types of I/O engines (sync, mmap, libaio, posixaio, SG v3, splice, null, network, syslet, guasi, solarisaio, and more), 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, including complete IO latencies and percentiles.
It is in wide use in many places, for both benchmarking, QA, and verification purposes. It supports Linux, FreeBSD, NetBSD, OpenBSD, OS X, OpenSolaris, AIX, HP-UX, Android, and Windows.
In this tutorial, we will be using Ubuntu 16 and you are required to have sudo or root privileges to the computer. We will go over the installation and use of fio.
### Installing fio from Source
We are going to clone the repo on GitHub. Install the prerequisites, and then we will build the packages from the source code. Lets' start by making sure we have git installed.
```
sudo apt-get install git
```
For centOS users you can use:
```
sudo yum install git
```
Now we change directory to /opt and clone the repo from Github:
Now, we change directory into the fio codebase by typing the command below inside the opt folder:
```
cd fio
```
We can finally build fio from source using the `make` build utility bu using the commands below:
```
# ./configure
# make
# make install
```
### Installing fio on Ubuntu
For Ubuntu and Debian, fio is available on the main repository. You can easily install fio using the standard package managers such as yum and apt-get.
For Ubuntu and Debian you can simple use:
```
sudo apt-get install fio
```
For CentOS/Redhat you can simple use:
On CentOS, you might need to install EPEL repository to your system before you can have access to fio. You can install it by running the following command:
```
sudo yum install epel-release -y
```
You can then install fio using the command below:
```
sudo yum install fio -y
```
### Disk Performace testing with Fio
With Fio is installed on your system. It's time to see how to use Fio with some examples below. We are going to perform a random write, read and read and write test.
### Performing a Random Write Test
Let's start by running the following command. This command will write a total 4GB file [4 jobs x 512 MB = 2GB] running 2 processes at a time:
We hope you enjoyed this tutorial and enjoyed following along, Fio is a very useful tool and we hope you can use it in your next debugging activity. If you enjoyed reading this post feel free to leave a comment of questions. Go ahead and clone the repo and play around with the code.
