process.memoryUsage()
返回描述 Node.js 进程的内存使用量(以字节为单位)的对象。
- Returns: <Object>
Returns an object describing the memory usage of the Node.js process measured in bytes.
import { memoryUsage } from 'node:process';
console.log(memoryUsage());
// Prints:
// {
// rss: 4935680,
// heapTotal: 1826816,
// heapUsed: 650472,
// external: 49879,
// arrayBuffers: 9386
// }
const { memoryUsage } = require('node:process');
console.log(memoryUsage());
// Prints:
// {
// rss: 4935680,
// heapTotal: 1826816,
// heapUsed: 650472,
// external: 49879,
// arrayBuffers: 9386
// }
heapTotal
andheapUsed
refer to V8's memory usage.external
refers to the memory usage of C++ objects bound to JavaScript objects managed by V8.rss
, Resident Set Size, is the amount of space occupied in the main memory device (that is a subset of the total allocated memory) for the process, including all C++ and JavaScript objects and code.arrayBuffers
refers to memory allocated forArrayBuffer
s andSharedArrayBuffer
s, including all Node.jsBuffer
s. This is also included in theexternal
value. When Node.js is used as an embedded library, this value may be0
because allocations forArrayBuffer
s may not be tracked in that case.
When using Worker
threads, rss
will be a value that is valid for the
entire process, while the other fields will only refer to the current thread.
The process.memoryUsage()
method iterates over each page to gather
information about memory usage which might be slow depending on the
program memory allocations.