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The SPDK fio plugin only supports jobs as threads, not separate processes. So log an error and bail if --thread=1 is not specified. Signed-off-by: Jim Harris <james.r.harris@intel.com> Change-Id: I318f924e0b7fbb76f11427a447dd7c5fc0ebc221
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Compiling
First, clone the fio source repository from http://github.com/axboe/fio
git clone http://github.com/axboe/fio
Then check out the fio 2.18 tag
cd fio && git checkout fio-2.18
Finally, compile the code with
./configure && make
Next, edit the CONFIG file located in the root of the SPDK repository and set CONFIG_FIO_PLUGIN to y and FIO_SOURCE_DIR to the location of the fio repository that was just created.
Further, you'll need to build DPDK with -fPIC set. You can do this by modifying your DPDK config file (i.e. config/defconfig_x86_64-native-linuxapp-gcc) to include the line
EXTRA_CFLAGS=-fPIC
At this point, build SPDK as per normal. The fio plugin will be placed in the same directory as this README.
Usage
To use the SPDK fio plugin with fio, simply set the following in the fio configuration file (see example_config.fio in the same directory as this README).
ioengine=<path to fio_plugin binary>
To select NVMe devices, you simply pass an identifier as the filename in the format
domain.bus.slot.func/namespace
Remember that NVMe namespaces start at 1, not 0! Also, the notation uses '.' throughout, not ':'. For example - 0000.04.00.0/1.
Currently the SPDK fio plugin is limited to a single thread, so only one job is supported. fio jobs must also specify thread=1 when using the SPDK fio plugin.
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.