process.cpuUsage([previousValue])


process.cpuUsage()方法返回包含当前进程的用户CPU时间和系统CPU时间的对象。此对象包含usersystem属性,属性值的单位都是微秒(百万分之一秒)。 usersystem属性值分别计算了执行用户程序和系统程序的时间,如果此进程在执行任务时是基于多核CPU,值可能比实际花费的时间要大。

上一次调用process.cpuUsage()方法的结果,可以作为参数值传递给此方法,得到的结果是与上一次的差值。

const startUsage = process.cpuUsage();
// { user: 38579, system: 6986 }

// spin the CPU for 500 milliseconds
const now = Date.now();
while (Date.now() - now < 500);

console.log(process.cpuUsage(startUsage));
// { user: 514883, system: 11226 }

The process.cpuUsage() method returns the user and system CPU time usage of the current process, in an object with properties user and system, whose values are microsecond values (millionth of a second). These values measure time spent in user and system code respectively, and may end up being greater than actual elapsed time if multiple CPU cores are performing work for this process.

The result of a previous call to process.cpuUsage() can be passed as the argument to the function, to get a diff reading.

const startUsage = process.cpuUsage();
// { user: 38579, system: 6986 }

// spin the CPU for 500 milliseconds
const now = Date.now();
while (Date.now() - now < 500);

console.log(process.cpuUsage(startUsage));
// { user: 514883, system: 11226 }