Introduction to Linux Performance Testing Tool Uptime

The Uptime command of the Linux performance testing tool displays how long the server has been running, how many login users there are, and the overall load average evaluation of server performance ). The load average value records the number of processes waiting for execution in the queue for the last 1 minute, 5 minutes, and 15 minutes respectively ).

The main evaluation indicator of linux system pressure is the load index of the last five minutes. As long as the load within five minutes is no greater than 5, the system is healthy and no maintenance is required, if this number is greater than 5, the system will usually slow down. There are several possible reasons:

1) the Linux Performance Testing Tool Uptime has a program that occupies a large amount of CPU. Use the top command to check whether java programs are locked or not)

2) Linux Performance Testing Tool Uptime has a program that occupies a large amount of memory, so that the memory is not enough. This is the time when the memory needs to be added)
For example, because MySQL (the best combination with PHP) runs a database with a capacity of GB under a large load, resulting in insufficient memory, more physical memory needs to be inserted to the server.

3) Linux Performance Testing Tool Uptime disk system read/write failures, IO throughput errors cause CPU load to rise, need to boot into single user mode scan Repair Disk, if not repaired, you can only change the New Hard Disk
Therefore, do not worry too much about the percentage of memory used by Linux/Unix systems. Generally, check the system load parameters.