dmsetup remove_all
wipefs -a --force /dev/sda1
mkfs -t btrfs /dev/sda1
mkdir -p /fs/sda1
mount -t btrfs /dev/sda1 /fs/sda1

for cpu_dir in /sys/devices/system/cpu/cpu[0-9]*
do
	online_file="$cpu_dir"/online
	[ -f "$online_file" ] && [ "$(cat "$online_file")" -eq 0 ] && continue

	file="$cpu_dir"/cpufreq/scaling_governor
	[ -f "$file" ] && echo "performance" > "$file"
done

echo '
[global]
bs=4M
ioengine=posixaio
iodepth=32
size=2147483648
direct=0
runtime=300
file_service_type=roundrobin
random_distribution=random
group_reporting
pre_read=0

nr_files=1
filesize=2147483648
invalidate=1
fallocate=posix
io_size=2147483648

[task_0]
rw=randwrite
directory=/fs/sda1
numjobs=64' | fio --output-format=json -