assert: typed array deepequal performance fix

assert.deepEqual: when actual and expected are typed arrays,
wrap them in a new Buffer each to increase performance
significantly.

PR-URL: https://github.com/nodejs/node/pull/4330
Fixes: https://github.com/nodejs/node/issues/4294
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/benchmark/assert/deepequal-typedarrays.js b/benchmark/assert/deepequal-typedarrays.js
new file mode 100644
index 0000000000..99c13206d7
--- /dev/null
+++ b/benchmark/assert/deepequal-typedarrays.js
@@ -0,0 +1,22 @@
+'use strict';
+var common = require('../common.js');
+var assert = require('assert');
+var bench = common.createBenchmark(main, {
+  type: ('Int8Array Uint8Array Int16Array Uint16Array Int32Array Uint32Array ' +
+    'Float32Array Float64Array Uint8ClampedArray').split(' '),
+  n: [1]
+});
+
+function main(conf) {
+  var type = conf.type;
+  var clazz = global[type];
+  var n = +conf.n;
+
+  bench.start();
+  var actual = new clazz(n * 1e6);
+  var expected = new clazz(n * 1e6);
+
+  assert.deepEqual(actual, expected);
+
+  bench.end(n);
+}