Linux Performance Tuning

USE method: Utilization, Saturation, Errors for every resource.

USE Method¶

• CPU: top -> utilization, vmstat -> runqueue
• Memory: free -h, vmstat si/so
• Disk: iostat -> utilization, await
• Network: sar -n DEV

CPU¶

top -o %CPU cpupower frequency-set -g performance taskset -c 0-3 ./my-app

Memory¶

free -h ps aux –sort=-%mem | head -10 sysctl vm.swappiness=10

Disk¶

iostat -xz 1 iotop -oP echo mq-deadline > /sys/block/sda/queue/scheduler

Sysctl¶

/etc/sysctl.d/99-perf.conf¶

vm.swappiness = 10 net.core.somaxconn = 65535 net.ipv4.tcp_tw_reuse = 1 fs.file-max = 2097152

Measure, Then Optimize¶

Never blindly. USE method -> identify the bottleneck -> targeted optimization.