test/parallel/test-memory-usage.js

// Copyright Joyent, Inc. and other Node contributors.
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// Flags: --predictable-gc-schedule
'use strict';
const common = require('../common');
const assert = require('assert');

const r = process.memoryUsage();
// On IBMi, the rss memory always returns zero
if (!common.isIBMi) {
  assert.ok(r.rss > 0);
  assert.ok(process.memoryUsage.rss() > 0);
}

assert.ok(r.heapTotal > 0);
assert.ok(r.heapUsed > 0);
assert.ok(r.external > 0);

assert.strictEqual(typeof r.arrayBuffers, 'number');
if (r.arrayBuffers > 0) {
  const size = 10 * 1024 * 1024;
  // eslint-disable-next-line no-unused-vars
  const ab = new ArrayBuffer(size);

  const after = process.memoryUsage();
  assert.ok(after.external - r.external >= size,
            `${after.external} - ${r.external} >= ${size}`);
  assert.strictEqual(after.arrayBuffers - r.arrayBuffers, size,
                     `${after.arrayBuffers} - ${r.arrayBuffers} === ${size}`);
}