Contents
How does FIO measure disk performance?
Run commands and use fio to test the disk performance: To test random write IOPS, run fio -direct=1 -iodepth=128 -rw=randwrite -ioengine=libaio -bs=4k -size=10G -numjobs=1 -runtime=600 -group_reporting -filename= /opt/fiotest/fiotest.
What is filename in FIO?
fio normally makes up a file name based on the job name, thread number, and file number. If you want to share files between threads in a job or several jobs, specify a filename for each of them to override the default. ‘-‘ is a reserved name, meaning stdin or stdout, depending on the read/write direction set.
What is a Fio?
free in and out: a term of contract in which a ship charterer pays for loading and unloading.
What is the default iodepth setting in Fio?
Keep an eye on the I/O depth distribution in the fio output to verify that the achieved depth is as expected. Default: 1. Fio has an iodepth setting that controls how many IOs it issues to the OS at any given time. This is entirely application-side, meaning it is not the same thing as the device’s IO queue.
Which is the best tool for Io benchmarking?
There are two proven software tools for IO benchmark used there – Iometer (http://www.iometer.org) for Windows and FIO (http://freecode.com/projects/fio) for Linux OS. Both of them offer many advanced features for simulating different types of workloads. Unfortunately, FIO lacks of GUI interface, it’s only command based.
Why is the depth not achieved in Fio?
Even async engines may impose OS restrictions causing the desired depth not to be achieved. This may happen on Linux when using libaio and not setting :option: direct \\=1, since buffered I/O is not async on that OS. Keep an eye on the I/O depth distribution in the fio output to verify that the achieved depth is as expected.
How to set Fio to run for the specified time?
time_based¶ If set, fio will run for the duration of the runtime specified even if the file(s) are completely read or written. It will simply loop over the same workload as many times as the runtime allows. startdelay=irange(time)¶ Delay the start of job for the specified amount of time.