How does Kirin OS monitor and optimize system performance?

Kirin operating system is a high-performance and high-reliability operating system independently developed by Huawei. It is widely used in various Huawei equipment and solutions. In order to ensure the operating efficiency and stability of the system, Kirin operating system provides a series of system performance monitoring and optimization functions. This article will introduce the system performance monitoring tools and optimization methods of Kirin operating system, and illustrate it through code examples.

1. System performance monitoring tools
   Kirin operating system provides a variety of system performance monitoring tools that can monitor the operating status and performance indicators of the system in real time. These include the following commonly used tools:

1.1 Top command
Top command is a command line tool for real-time monitoring of system performance. It can display the system's CPU usage, memory usage, and processes. Status etc. By entering the top command, you can view the overall performance of the system and sort by various indicators. The following is a sample code for using the top command to view the system CPU usage:

$ top

1.2 SAR command
The SAR command is a system performance analysis tool that can collect and report various performance data of the system, such as CPU usage , memory usage, disk IO, network bandwidth, etc. The following is a sample code for using the SAR command to view CPU usage:

$ sar -u

1.3 Perf tool
Perf is a powerful performance analysis tool that can perform comprehensive performance analysis and tuning of the system. It can monitor performance indicators in various aspects such as CPU, memory, disk IO, network, etc., and generate detailed reports. The following is a sample code for using the perf command to monitor system CPU usage:

$ perf stat -e cpu-cycles -a sleep 10

2. System performance optimization methods
   In addition to system performance monitoring tools, Kirin operating system also provides some performance optimization methods that can help Users improve the operating efficiency and response speed of the system. Here are some commonly used performance optimization methods.

2.1 Process priority adjustment
The process scheduler of Kirin operating system can allocate CPU resources according to the priority of the process. Users can adjust the execution order and execution order of the process by modifying the priority of the process. The proportion of CPU time occupied. The following is a sample code for adjusting process priority:

$ renice -n -10 -p <pid>

2.2 Cache Management
Kylin operating system provides a rich cache management mechanism, which can optimize the system's IO performance by adjusting the parameters of the cache mechanism. The following is a sample code for adjusting cache parameters:

$ echo 2048 > /proc/sys/vm/dirty_background_bytes

2.3 System kernel optimization
The kernel of Kirin operating system is highly customizable, and users can optimize the kernel according to the needs of the system. Kernel parameters can be adjusted by modifying the kernel configuration file to improve system performance and stability. The following is a sample code for modifying kernel parameters:

$ echo 1000000 > /proc/sys/kernel/threads-max

Through system performance monitoring tools and performance optimization methods, Kirin operating system can monitor the system's operating status and performance indicators in real time, and provide corresponding optimization methods. In actual system operation, maintenance and development work, you can choose appropriate tools and methods as needed to monitor and optimize the system performance to improve system performance and stability.

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