1. Use w to view the system load
w, uptime to view the system load, 0.00 means the load is 0 within 1 minute
cat /proc/cpuinfo to view the number of cpu cores
Second, vmstat command, view process, cpu, memory, swap, io, system
r 、 swpd 、 si 、 so 、 bi 、 bo 、 us 、 wa
Dynamic display a total of 5 times per second
run is running, the block process is waiting, and the swap partition will not be placed until there is not enough memory.
How many kilobytes of data si/so enter/exit from swap memory, bi/bo read/write memory from disk, us user occupies cpu percentage, will not exceed 100, id is idle, wa waits for wait
3. top
Top view the resource usage of the process, update every 3 seconds
top -c shows detailed process information
top -bin1 shows all processes statically
q to exit, number 1 to show all core cpus, M to sort by memory usage
Big P sorted by cpu usage
Fourth, the sar command
[root@davery ~]# yum install -y sysstat
sar -n DEV 1 5 NIC traffic
sar -q system load
sar -b disk read and write
sar -f /var/log/sa/sa08 View historical file No. 08
Five, nload command
yum install -y epel-release
yum install -y nload