Linux performance monitoring

This article mainly talks about the operation of performance monitoring on Linux (CentOS).

1. Monitor cpu usage --uptime

This command will print out the current time, how long the system has been running, the current number of logged-in users, and the average system load

The load here is the evaluation of how many processes are waiting in the CPU waiting queue per unit time. The more waiting processes, the busier the CPU.

2. Monitor the usage of memory and swap partition--free

3. System disk usage--df

Here we use df -h to display capacity information in a humanized manner

4. Monitor network usage--ip and netstat

ip can check the interface information of the network card. In centos, the network card does not use the unified command ethx. Instead, it checks the host hardware information and makes different commands according to different network cards. The netstat command can check the port information opened by the server and The link status of the network.

5. Print network connection, routing table, network interface statistics and other information

6. Monitor process usage-ps and top commands

ps
View current process information (ps has different syntax in different versions, here is centos)
ps -e View all process information

ps -ef displays process information in full format

top Dynamically view process information
top -d refresh interval, default 3 seconds

top -p View the pid of the specified process

The above is the detailed content of Linux performance monitoring. For more information, please follow other related articles on the PHP Chinese website!