Why does linux cpu sys occupy too much?

linux cpu sys refers to the system usage in CPU occupancy that is too high: 1. Frequent IO operations, there are a large number of disk read and write operations in the system; 2. The network load is too high, and the system bears high network traffic 3. Running a large number of background programs or multi-threaded applications will lead to an increase in system usage and so on.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, sys refers to the system usage (System) in CPU usage. System utilization represents the proportion of CPU time spent by the operating system kernel performing system-level tasks.

When the CPU's sys usage is too high, it means that the system kernel is performing a large number of system-level tasks, such as device drivers, process scheduling, file system operations, etc. This may be caused by the following situations:

1. Frequent IO operations:

If there are a large number of disk read and write operations in the system, such as file copying and database query etc., which will cause the CPU usage of the system kernel to increase.

2. Network load:

When the system bears high network traffic, such as a network server or network switch, the system kernel needs to process the sending and receiving, routing, etc. of network data packets. tasks, causing CPU usage to rise.

3. Process scheduling:

The system kernel is responsible for process scheduling. If there are a large number of processes in the system competing for CPU time, such as running a large number of background programs or multi-threads application, will result in increased system usage.

4. Device driver:

Some device drivers may require a large amount of CPU resources to handle the device's interrupt requests and data transmission, especially at high temperatures. Under load, this may result in high system utilization.

When the system usage of the CPU is too high, it may cause the system to respond slowly or even freeze. In order to reduce system usage, you can take some of the following measures:

• Optimize programs: Check whether there are programs with low operating efficiency and optimize them to reduce the usage of system resources.

• Adjust system parameters: According to specific conditions, adjust operating system parameters, such as I/O scheduling algorithms, network parameters, etc., to improve system throughput and response speed.

• Load balancing: If there are multiple servers, you can consider using load balancing technology to spread the load across multiple servers to reduce the burden on each server.

• Upgrade hardware: If you face high system usage for a long time, you may need to consider upgrading your hardware, such as adding more CPU cores or memory capacity to improve system performance.

Finally, to solve the problem of excessive CPU system usage, it is usually necessary to conduct an in-depth analysis of the specific situation and reasons, and take corresponding optimization measures based on the actual situation.

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