mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
961 B
31 lines
961 B
9 years ago
|
'use strict';
|
||
|
|
require('../common');
|
||
|
|
const assert = require('assert');
|
||
|
|
|
||
|
|
const start = process.cpuUsage();
|
||
|
|
|
||
|
|
// Run a busy-loop for specified # of milliseconds.
|
||
|
|
const RUN_FOR_MS = 500;
|
||
|
|
|
||
|
|
// Define slop factor for checking maximum expected diff values.
|
||
|
|
const SLOP_FACTOR = 2;
|
||
|
|
|
||
|
|
// Run a busy loop.
|
||
|
|
const now = Date.now();
|
||
|
|
while (Date.now() - now < RUN_FOR_MS);
|
||
|
|
|
||
|
|
// Get a diff reading from when we started.
|
||
|
|
const diff = process.cpuUsage(start);
|
||
|
|
|
||
|
|
const MICROSECONDS_PER_SECOND = 1000 * 1000;
|
||
|
|
|
||
|
|
// Diff usages should be >= 0, <= ~RUN_FOR_MS millis.
|
||
|
|
// Let's be generous with the slop factor, defined above, in case other things
|
||
|
|
// are happening on this CPU. The <= check may be invalid if the node process
|
||
|
|
// is making use of multiple CPUs, in which case, just remove it.
|
||
|
|
assert(diff.user >= 0);
|
||
|
|
assert(diff.user <= SLOP_FACTOR * RUN_FOR_MS * MICROSECONDS_PER_SECOND);
|
||
|
|
|
||
|
|
assert(diff.system >= 0);
|
||
|
|
assert(diff.system <= SLOP_FACTOR * RUN_FOR_MS * MICROSECONDS_PER_SECOND);
|