How to use Linux for CPU utilization optimization

How to use Linux for CPU utilization optimization

Abstract: In Linux systems, optimizing CPU utilization can improve system performance and resource utilization efficiency. This article will introduce some common CPU utilization optimization techniques and give corresponding code examples.

1. Use the process scheduling algorithm

1. Modify the process scheduling policy: The Linux system uses the completely fair scheduling (CFS) algorithm by default, and the scheduling policy can be modified according to actual needs. For example, setting the process scheduling policy to the real-time scheduling (RT) algorithm can allocate more CPU time slices to critical tasks.

Code example:

# 修改进程调度策略为实时调度算法
chrt -r -p 99 <PID>

2. Priority setting: You can control the order in which processes obtain CPU time slices by adjusting the priority of the process. Higher priority processes will get more CPU time and execute faster.

Code example:

# 设置进程的优先级为较高级别（范围：-20 ~ 19，-20表示最高优先级）
nice -n -10 <command>

2. Use multi-threading technology

1. Concurrent programming: Use multi-threading technology to perform multiple tasks at the same time and make full use of Multi-core CPU performance. You can use multi-threading libraries (such as pthread) for thread creation and management.

Code example:

#include <stdio.h>
#include <pthread.h>

void* task(void* arg) {
  // 线程的具体任务
  printf("Hello from thread!
");
  return NULL;
}

int main() {
  pthread_t tid;
  pthread_create(&tid, NULL, task, NULL);
  printf("Hello from main thread!
");
  pthread_join(tid, NULL);  // 等待子线程结束
  return 0;
}

3. Use efficient algorithms and data structures

1. Space for time: Using efficient algorithms and data structures can reduce CPU calculation time. For example, using a hash table allows you to quickly find elements without having to traverse the entire data set.

Code example:

#include <iostream>
#include <unordered_map>

int main() {
  std::unordered_map<int, std::string> map;
  map[1] = "Hello";
  map[2] = "World";
  std::cout << map[1] << " " << map[2] << std::endl;
  return 0;
}

4. Use system tools

1. Monitor CPU utilization: Use system tools to monitor CPU usage and help optimize CPU utilization. Commonly used system tools include top, htop, powertop, etc.

Code example:

# 使用top命令查看CPU利用率
top

2. Adjust CPU frequency: On some CPUs with dynamic frequency adjustment function, the frequency of the CPU can be adjusted to reduce power consumption and temperature, and Improve CPU performance.

Code sample:

# 设置CPU频率为最高性能模式
sudo cpupower frequency-set --governor performance

Summary: By using process scheduling algorithms, multi-threading technology, efficient algorithms and data structures, and the cooperation of system tools, the Linux system can be effectively optimized CPU utilization. Properly scheduling tasks, making full use of multi-core CPUs, and using efficient computing methods can improve system performance and resource utilization efficiency.

Reference materials:

1. Linux Manual Pages
2. pthread Library Documentation
3. C Standard Library Documentation

The above is the detailed content of How to use Linux for CPU utilization optimization. For more information, please follow other related articles on the PHP Chinese website!