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WIP: test: force garbage collection on crypto timing test #8203

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Trott wants to merge 7 commits into from
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WIP: test: force garbage collection on crypto timing test #8203

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b487bfb
test: force garbage collection on crypto timing test
Trott Aug 21, 2016
347e60d
squash: gc every time
Trott Aug 21, 2016
ac7c143
squash: 10K -> 1K
Trott Aug 21, 2016
c672a47
squash: flip
Trott Aug 21, 2016
26a3080
squash: logging
Trott Aug 21, 2016
fb8c326
squash: two separate functions for benchmarks
not-an-aardvark Aug 22, 2016
4f562ee
squash: replace timingSafeEqual with incorrect timing-safe function
not-an-aardvark Aug 22, 2016
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test: force garbage collection on crypto timing test 
Garbage collection interferes with timing statistics gathering so force
it before beginning the data collection.
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@Trott
Trott committed Aug 21, 2016
commit b487bfbfab836f4ddd76c909b1477321b5ac716b
7 changes: 6 additions & 1 deletion test/sequential/test-crypto-timing-safe-equal.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Flags: --allow_natives_syntax
// Flags: --allow_natives_syntax --expose-gc
'use strict';
const common = require('../common');
const assert = require('assert');
Expand All @@ -8,6 +8,8 @@ if (!common.hasCrypto) {
return;
}

assert.equal(typeof global.gc, 'function', 'Run this test with --expose-gc');

const crypto = require('crypto');

assert.strictEqual(
Expand Down Expand Up @@ -127,6 +129,8 @@ runBenchmark(crypto.timingSafeEqual, Buffer.from('A'), Buffer.from('A'), true);
// significantly affect the threshold.
const T_THRESHOLD = 3.291;

// Make sure garbage collection does not interfere with timing
global.gc();
const t = getTValue(crypto.timingSafeEqual);
assert(
Math.abs(t) < T_THRESHOLD,
Expand All @@ -137,6 +141,7 @@ assert(
// same benchmarks again, this time with an unsafe comparison function. In this
// case the t-value should be above the threshold.
const unsafeCompare = (bufA, bufB) => bufA.equals(bufB);
global.gc();
const t2 = getTValue(unsafeCompare);
assert(
Math.abs(t2) > T_THRESHOLD,
Expand Down