History

Darek Stojaczyk 410bdfdbe3 bdev/fio_plugin: accept wildcard () as fio target FIO in our scripts is usually run as follows: (more or less) fio_bdev /path/to/job.fio --spdk_json_conf=/path/to/spdk.json --filename="$(discover_bdevs /path/to/spdk.json --json)" The bdev names are usually hardcoded in the json config, but still, they have to be provided to fio again. Not anymore - just use --filename= and FIO will use all available bdevs as I/O targets, just as if all filenames were provided. The above command could be now simplified to: fio_bdev /path/to/job.fio --spdk_json_conf=/path/to/spdk.json --filename=* Change-Id: I56a02e56877b138429d68fb24f1a383c6700c4f4 Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com> Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1542 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>		2020-04-06 07:56:11 +00:00
..
.gitignore	bdev: Add an example fio plugin	2017-08-04 20:03:37 -04:00
bdev.conf.in	bdev: Add an example fio plugin	2017-08-04 20:03:37 -04:00
example_config.fio	bdev: Add an example fio plugin	2017-08-04 20:03:37 -04:00
fio_plugin.c	bdev/fio_plugin: accept wildcard (*) as fio target	2020-04-06 07:56:11 +00:00
full_bench.fio	bdev: Add an example fio plugin	2017-08-04 20:03:37 -04:00
Makefile	make: don't link vpp into fio plugins.	2020-03-26 08:12:04 +00:00
README.md	examples/fio_plug-in: update README to clarify licensing	2020-02-20 09:48:11 +00:00

README.md

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>/examples/bdev/fio_plugin/fio_plugin 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.