node . js OS . CPU()方法

原文:https://www.geeksforgeeks.org/node-js-os-cpus-method/

os . CPU()方法是 OS 模块的内置应用编程接口，用于获取计算机每个逻辑 CPU 内核的信息。

语法:

os.cpus()

参数:此方法不接受任何参数。

Return: 这个方法返回一个包含每个逻辑 CPU 核心信息的对象。每个返回的对象将包含以下属性:

  • Model: A string that specifies the CPU kernel model.
  • Speed: A number that specifies the CPU core speed (in megahertz).
  • Time: Objects with the following attributes:
    • User: A number specifies the time (in milliseconds) spent by the CPU in user mode.
    • nice: A number specifies the time spent by the CPU in nice mode, in milliseconds.
    • sys: A number specifies the time spent by CPU in sys mode, in milliseconds.
    • idle: A number specifies the time spent by the CPU in idle mode, in milliseconds.
    • irq: A number that specifies the time spent by the CPU in IRQ mode, in milliseconds.

注意:nice值仅用于 POSIX。在 Windows 操作系统上，所有处理器的nice值始终为 0。

下面的例子说明了OS . CPU()方法在 Node.js 中的使用:

例 1:

// Node.js program to demonstrate the   
// os.cpus() method

// Allocating os module
const os = require('os');

// Printing os.cpus() values
console.log(os.cpus());

输出:

[ { model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
    speed: 2712,
    times:
     { user: 900000, nice: 0, sys: 940265, idle: 11928546, irq: 147046 } },
  { model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
    speed: 2712,
    times:
     { user: 860875, nice: 0, sys: 507093, idle: 12400500, irq: 27062 } },
  { model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
    speed: 2712,
    times:
     { user: 1273421, nice: 0, sys: 618765, idle: 11876281, irq: 13125 } },
  { model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
    speed: 2712,
    times:
     { user: 943921, nice: 0, sys: 460109, idle: 12364453, irq: 12437 } } ]

例 2:

// Node.js program to demonstrate the   
// os.cpus() method

// Allocating os module
const os = require('os');

// Printing os.cpus()
var cpu_s=os.cpus();
var no_of_logical_core=0;
cpu_s.forEach(element => { 
    no_of_logical_core++;
    console.log("Logical core "
            + no_of_logical_core + " :");
    console.log(element); 
}); 

console.log("total number of logical core is "
        + no_of_logical_core);

输出:

Logical core 1 :
{ model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
  speed: 2712,
  times:
   { user: 856437, nice: 0, sys: 866203, idle: 11070046, irq: 133562 } }
Logical core 2 :
{ model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
  speed: 2712,
  times:
   { user: 805296, nice: 0, sys: 462656, idle: 11524406, irq: 23218 } }
Logical core 3 :
{ model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
  speed: 2712,
  times:
   { user: 1225062, nice: 0, sys: 566421, idle: 11000875, irq: 12203 } }
Logical core 4 :
{ model: 'Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz',
  speed: 2712,
  times:
   { user: 900234, nice: 0, sys: 420000, idle: 11472125, irq: 11781 } }
total number of logical core is 4

注意:以上程序使用node index.js命令编译运行。

参考:https://nodejs . org/API/OS . html # OS _ OS _ CPU

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