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30 lines
961 B
30 lines
961 B
'use strict';
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require('../common');
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const assert = require('assert');
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const start = process.cpuUsage();
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// Run a busy-loop for specified # of milliseconds.
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const RUN_FOR_MS = 500;
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// Define slop factor for checking maximum expected diff values.
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const SLOP_FACTOR = 2;
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// Run a busy loop.
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const now = Date.now();
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while (Date.now() - now < RUN_FOR_MS);
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// Get a diff reading from when we started.
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const diff = process.cpuUsage(start);
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const MICROSECONDS_PER_SECOND = 1000 * 1000;
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// Diff usages should be >= 0, <= ~RUN_FOR_MS millis.
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// Let's be generous with the slop factor, defined above, in case other things
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// are happening on this CPU. The <= check may be invalid if the node process
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// is making use of multiple CPUs, in which case, just remove it.
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assert(diff.user >= 0);
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assert(diff.user <= SLOP_FACTOR * RUN_FOR_MS * MICROSECONDS_PER_SECOND);
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assert(diff.system >= 0);
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assert(diff.system <= SLOP_FACTOR * RUN_FOR_MS * MICROSECONDS_PER_SECOND);
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