stream: avoid additional validation for Buffers

These changes result in ~50% improvement in the included benchmark.

PR-URL: https://github.com/nodejs/node/pull/10580
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/benchmark/streams/writable-manywrites.js b/benchmark/streams/writable-manywrites.js
new file mode 100644
index 0000000000..fadafe86e4
--- /dev/null
+++ b/benchmark/streams/writable-manywrites.js
@@ -0,0 +1,23 @@
+'use strict';
+
+const common = require('../common');
+const Writable = require('stream').Writable;
+
+const bench = common.createBenchmark(main, {
+  n: [2e6]
+});
+
+function main(conf) {
+  const n = +conf.n;
+  const b = Buffer.allocUnsafe(1024);
+  const s = new Writable();
+  s._write = function(chunk, encoding, cb) {
+    cb();
+  };
+
+  bench.start();
+  for (var k = 0; k < n; ++k) {
+    s.write(b);
+  }
+  bench.end(n);
+}