#!/bin/bash

set -e
set -x
modprobe brd rd_nr=1 rd_size=20000000 max_part=1
bcachefs format /dev/ram0
mount -t bcachefs /dev/ram0 /mnt
START=`date +%s`
while [ $(( $(date +%s) - 3600 )) -lt $START ]; do

        OPTIONS="--filesize=1G --numjobs=16 --iodepth=256 --ioengine=libaio \
        --eta=never --ramp_time=2s --runtime=1m --direct=1 --verify=0 \
        --randrepeat=0 --group_reporting --directory=/mnt --unlink=1"

        fio --name=write --blocksize=1m --readwrite=write $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
        fio --name=randwrite --blocksize=4k --readwrite=randwrite $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
        fio --name=read --blocksize=1m --readwrite=read $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
        fio --name=randread --blocksize=4k --readwrite=randread $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt

        OPTIONS="--filesize=16G --numjobs=1 --iodepth=1 --ioengine=libaio \
        --eta=never --ramp_time=2s --runtime=1m --direct=1 --verify=0 \
        --randrepeat=0 --group_reporting --directory=/mnt --unlink=1"

        fio --name=write --blocksize=1m --readwrite=write $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
        fio --name=randwrite --blocksize=4k --readwrite=randwrite $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
        fio --name=read --blocksize=1m --readwrite=read $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
        fio --name=randread --blocksize=4k --readwrite=randread $OPTIONS
        ls -alh /mnt; df -h /mnt; bcachefs fs usage /mnt
done

umount /mnt
rmmod brd