node 内存展示

memory.js

'use strict';

const os = require('os');

function format (bytes) {
  return (bytes / 1024 / 1024).toFixed(2) + ' MB';
}

function showMem () {
  const mem = process.memoryUsage();
  console.log('Process: heapTotal ' + format(mem.heapTotal) +
    ' heapUsed ' + format(mem.heapUsed) +
    ' rss ' + format(mem.rss) +
    ' external ' + format(mem.external));
  console.log('-------------------------------------------------------------------');
}

function useMem () {

  // array
  // const size = 20 * 1024 * 1024;
  // const arr = new Array(size);
  // for (let i = 0; i < size; i++) {
  //   arr[i] = 0;
  // }
  // return arr;

  // buffer
  const size = 200 * 1024 * 1024;
  const buffer = new Buffer(size);
  for (let i = 0; i < size; i++) {
    buffer[i] = 0;
  }
  return buffer;
}

function showOsMem () {
  const total = os.totalmem();
  const free = os.freemem();
  console.log('OS: total ' + format(total) + ' free ' + format(free));
}

const total = [];

for (let i = 0; i < 15; i++) {
  showOsMem();
  showMem();
  total.push(useMem());
}

showMem();