[SPDK] How to use the fio plugin

I'm trying to run some fio benchmarks and it doesn't seem to work for me. The example in GitHub ( https://github.com/spdk/spdk/tree/master/examples/nvme/fio_plugin) doesn't work (says "size=" is required) and it's very unclear if there needs to be any configuration to point to the device. It seems that when I run it everything goes straight to the root filesystem (drive gets saturated with writes, all terminals freeze) or memory (ungodly throughputs). Here's one input file: [global] And I get: Run status group 0 (all jobs): Am I using it correctly? Something seems off. Also, my root filesystem gets saturated with writes. I can easily notice it using dstat. Is this normal? Could anyone give me a pointer or an example which works? My end goal is to do some random writes benchmarks. Thank you.