How to use Linux for system performance tuning and monitoring

How to use Linux for system performance tuning and monitoring

Introduction:
Linux is an open source operating system that is widely used in server environments and embedded devices. When using Linux for system performance tuning and monitoring, we can achieve this through some simple commands and tools. This article will introduce some commonly used Linux performance tuning and monitoring methods, as well as related code examples.

1. CPU performance tuning and monitoring

1. View CPU information
   Use the command "lscpu" to view CPU-related information, including model, number of cores, Number of threads, etc.
   Sample code:

   lscpu

2. View CPU usage
   Use the command "top" to view real-time CPU usage and the CPU usage of each process. Press "1" to display the usage of each core.
   Sample code:

   top

3. Set CPU scheduling policy
   Use the command "chrt" to set the CPU scheduling policy and set the specified process to real-time priority.
   Sample code:

   chrt -f -p 99 <进程PID>

2. Memory performance tuning and monitoring

1. View memory usage
   Use the command "free "You can view the system's memory usage, including total memory, used memory, free memory, etc.
   Sample code:

   free -h

2. View process memory usage
   Use the command "pmap" to view the memory usage of the specified process, including virtual memory, shared memory, and private memory wait.
   Sample code:

   pmap <进程PID>

3. Adjust memory allocation
   You can adjust the memory allocation strategy by modifying system parameters, including adjusting virtual memory size, adjusting memory buffer size, etc. The relevant system parameter files are located in the "/proc/sys/vm" directory.
   Sample code:

   echo <数值> > /proc/sys/vm/<参数文件名>

3. Disk performance tuning and monitoring

1. View disk usage
   Use the command "df "You can view disk usage, including total disk capacity, used capacity, available capacity, etc.
   Sample code:

   df -h

2. View disk IO status
   Use the command "iostat" to check the disk IO status, including read and write speed, number of IO requests, etc.
   Sample code:

   iostat

3. Adjust disk scheduling strategy
   You can adjust the disk scheduling strategy by modifying system parameters, including setting the IO scheduler, adjusting the IO request queue length, etc. The relevant system parameter files are located in the "/sys/block//queue" directory.
   Sample code:

   echo <调度策略> > /sys/block/<设备名称>/queue/scheduler

4. Network performance tuning and monitoring

1. Check the network connection status
   Use the command "netstat "You can check the network connection status, including local IP address, remote IP address, connection status, etc.
   Sample code:

   netstat -an

2. View network traffic
   Use the command "nethogs" to view process-level network traffic, including the network receiving and sending speed of each process.
   Sample code:

   nethogs

3. Adjust network parameters
   You can adjust network parameters by modifying system parameters, including adjusting TCP buffer size, adjusting network delay, etc. The relevant system parameter files are located in the "/proc/sys/net" directory.
   Sample code:

   echo <数值> > /proc/sys/net/<参数文件名>

Conclusion:
This article introduces some common methods of using Linux for system performance tuning and monitoring, and provides relevant code examples for readers practice. However, the configurations and requirements of different systems may be different, so readers can adjust and optimize according to the actual situation. I hope this article will be helpful to readers in performance tuning and monitoring using Linux.

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