How to perform advanced system tuning and configuration on Kirin OS?

How to perform advanced system tuning and configuration on Kirin operating system?

Introduction:
Kirin operating system is a Linux-based operating system with a high degree of stability and security, and is widely used in servers and personal computers. However, in order to get better performance and adapt to specific needs, we need to perform advanced tuning and configuration. This article will introduce how to perform advanced system tuning and configuration on Kirin operating system, including kernel parameter optimization, file system settings, IO scheduling, process priority, memory management, etc., and provide corresponding code examples.

1. Kernel parameter optimization
The performance and stability of Kirin operating system are closely related to the setting of kernel parameters. Kernel parameters can be changed by modifying files in the /sys or /proc directories. The following is some sample code for common kernel parameter settings:

(1) Adjust TCP/IP related parameters:
sysctl -w net.core.somaxconn=65535
sysctl -w net.ipv4 .tcp_max_syn_backlog=65535
sysctl -w net.ipv4.tcp_max_tw_buckets=65535

(2) Adjust the file descriptor limit:
sysctl -w fs.file-max=65535
ulimit - n 65535

(3) Adjust the memory allocation mechanism:
sysctl -w vm.swappiness=10
sysctl -w vm.dirty_ratio=5
sysctl -w vm.dirty_background_ratio=3

2. File system settings
The selection and optimization of the file system also have an important impact on the performance of the system. In Kirin operating system, the ext4 file system is used by default. Here is some sample code for file system settings:

(1) Enable write cache:
tune2fs -o journal_data_writeback /dev/sda1

(2) Adjust the maximum number of open files:
echo "* - nofile 65535" >> /etc/security/limits.conf

3. IO scheduling method
IO scheduling method refers to the selection of the scheduling method for disk IO requests , different scheduling methods are suitable for different scenarios. In the Kirin operating system, the deadline scheduling method is used by default. The following is some sample code for IO scheduling mode settings:

(1) Change the scheduling mode:
echo "deadline" > /sys/block/sda/queue/scheduler

（ 2) Set the read-write ratio:
echo "512" > /sys/block/sda/queue/iosched/writes_starved

4. Process priority
For processes that need priority, You can improve the efficiency of a process by adjusting its priority. In Kirin OS, the default process priority range is -20 to 19. The following is some sample code for process priority settings:

(1) Adjust process priority:
renice -20 -p 12345

5. Memory management
For the system Memory management can improve performance by adjusting the page replacement policy and memory allocation mechanism. The following is sample code for some memory management settings:

(1) Adjust the page replacement policy:
echo "0" > /proc/sys/vm/swappiness

(2) Use hugepages:
echo "vm.nr_hugepages = 256" >> /etc/sysctl.conf

Summary:
This article introduces how to perform advanced system tuning on Kirin operating system and configuration. By adjusting kernel parameters, file system settings, IO scheduling methods, process priorities and memory management, the system can achieve better performance and adaptability in different application scenarios. However, the actual system tuning and configuration depends on the specific needs and environment, and needs to be adjusted and optimized according to the actual situation.

Reference materials:
[1] https://github.com/kunpengcompute/khanka/blob/master/tuning_guide.md

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