View Centos system performance indicators

1. check CPU usage the cpu usage reflects the current cpu usage. the reason for its high or low usage is that the process that occupies cpu processing time may be in the I/O waiting status but has not yet been released and enters wait. The average load (loadaverage) refers to the number of processes that occupy cpu time and wait for cpu time in a certain period of time. here, the process waiting for cpu time refers to the process waiting for wake-up, processes in the wait status are not included. 1. CPU usage of good status indicators: UserTime & lt; = 70%, Sy

1. View CPU usage

Cpu usage reflects the current cpu usage. the reason for its high or low usage is that the process that occupies cpu processing time may be in the I/O waiting status but has not been released and enters wait.

The average load average refers to the number of processes that occupy cpu time and wait for cpu time in a certain period of time. here, the process waiting for cpu time refers to the process waiting for wake-up, processes in the wait status are not included.

1. good status indicators

• CPU utilization: User Time <= 70%, System Time <= 35%, User Time + System Time <= 70%.
• Context Switch: it is associated with the CPU usage. If the CPU usage is in good state, a large number of context switches are acceptable.

• Runnable queue: three threads per processor.

2. tools

(1) vmstat