Chapter 13: Performance

CPU and Memory

top
htop
vmstat 1 5
sar -u 1 5
mpstat
free -h

Disk IO

iostat -x 1 5
iotop
df -h
du -sh /*

Network

iftop
nethogs
ss -tuln
ip -s link

Load Average

uptime
w
cat /proc/loadavg

• Load avg: 1m 5m 15m values
• 1.0 per CPU core = 100% utilisation
• Check CPU, RAM, disk IO, network in order