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# Introduction
This directory contains a plug-in module for fio to enable use
with SPDK. Fio is free software published under version 2 of
the GPL license.
# Compiling fio
Clone the fio source repository from https://github.com/axboe/fio
git clone https://github.com/axboe/fio
cd fio
Compile the fio code and install:
make
make install
# Compiling SPDK
Clone the SPDK source repository from https://github.com/spdk/spdk
git clone https://github.com/spdk/spdk
cd spdk
git submodule update --init
Then, run the SPDK configure script to enable fio (point it to the root of the fio repository):
cd spdk
./configure --with-fio=/path/to/fio/repo <other configuration options>
Finally, build SPDK:
make
**Note to advanced users**: These steps assume you're using the DPDK submodule. If you are using your
own version of DPDK, the fio plugin requires that DPDK be compiled with -fPIC. You can compile DPDK
with -fPIC by modifying your DPDK configuration file and adding the line:
EXTRA_CFLAGS=-fPIC
# Usage
To use the SPDK fio plugin with fio, specify the plugin binary using LD_PRELOAD when running
fio and set ioengine=spdk_bdev in the fio configuration file (see example_config.fio in the same
directory as this README).
LD_PRELOAD=<path to spdk repo>/build/fio/spdk_bdev fio
The fio configuration file must contain one new parameter:
spdk_conf=./examples/bdev/fio_plugin/bdev.conf
This must point at an SPDK configuration file. There are a number of example configuration
files in the SPDK repository under etc/spdk.
You can specify which block device to run against by setting the filename parameter
to the block device name:
filename=Malloc0
Or for NVMe devices:
filename=Nvme0n1
Currently the SPDK fio plugin is limited to the thread usage model, so fio jobs must also specify thread=1
when using the SPDK fio plugin.
fio also currently has a race condition on shutdown if dynamically loading the ioengine by specifying the
engine's full path via the ioengine parameter - LD_PRELOAD is recommended to avoid this race condition.
When testing random workloads, it is recommended to set norandommap=1. fio's random map
processing consumes extra CPU cycles which will degrade performance over time with
the fio_plugin since all I/O are submitted and completed on a single CPU core.
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