Raspberry Pi 4B Maintenance Guide - pip3 & disk performance test

[davideuler]

1.Install pip
#python3 -m pip install

/usr/bin/python3: No module named pip

You need to install python3-pip

#apt install python3-pip

2.Performance disk write performance test

Perform write perf test on root disk, just write a file to /tmp/temp.file
sudo dd if=/dev/zero of=/tmp/temp.file oflag=direct bs=128k count=8k

Perform write test on /dev/sda2 which is mounted at /data:
sudo dd if=/dev/zero of=/data/temp.file oflag=direct bs=128k count=8k

3.Performance disk read performance test
sudo apt install hdparm
sudo hdparm -Ttv /dev/sda2

On my test, both the write performance on micro SD card, and Samsung EVO 840 SSD are about 15 MB/s, it is quiet slow.

Note on raspberry pi disk io performance:
https://rvprasad.medium.com/how-fast-is-i-o-on-a-raspberry-pi-3b-fbf85cd6e58d
https://github.com/rvprasad/io-perf
https://raspberrypi.stackexchange.com/questions/43618/raspberry-pi-3-micro-sd-card-speed