buffer: optimize write()

PR-URL: https://github.com/nodejs/node/pull/12361
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 70 insertions, 0 deletions

diff --git a/benchmark/buffers/buffer-write-string.js b/benchmark/buffers/buffer-write-string.js
new file mode 100644
index 0000000000..927aa0b684
--- /dev/null
+++ b/benchmark/buffers/buffer-write-string.js
@@ -0,0 +1,70 @@
+'use strict';
+
+const common = require('../common.js');
+const bench = common.createBenchmark(main, {
+  encoding: [
+    '', 'utf8', 'ascii', 'hex', 'UCS-2', 'utf16le', 'latin1', 'binary'
+  ],
+  args: [ '', 'offset', 'offset+length' ],
+  len: [10, 2048],
+  n: [1e7]
+});
+
+function main(conf) {
+  const len = +conf.len;
+  const n = +conf.n;
+  const encoding = conf.encoding;
+  const args = conf.args;
+
+  const string = 'a'.repeat(len);
+  const buf = Buffer.allocUnsafe(len);
+
+  var i;
+
+  switch (args) {
+    case 'offset':
+      if (encoding) {
+        bench.start();
+        for (i = 0; i < n; ++i) {
+          buf.write(string, 0, encoding);
+        }
+        bench.end(n);
+      } else {
+        bench.start();
+        for (i = 0; i < n; ++i) {
+          buf.write(string, 0);
+        }
+        bench.end(n);
+      }
+      break;
+    case 'offset+length':
+      if (encoding) {
+        bench.start();
+        for (i = 0; i < n; ++i) {
+          buf.write(string, 0, buf.length, encoding);
+        }
+        bench.end(n);
+      } else {
+        bench.start();
+        for (i = 0; i < n; ++i) {
+          buf.write(string, 0, buf.length);
+        }
+        bench.end(n);
+      }
+      break;
+    default:
+      if (encoding) {
+        bench.start();
+        for (i = 0; i < n; ++i) {
+          buf.write(string, encoding);
+        }
+        bench.end(n);
+      } else {
+        bench.start();
+        for (i = 0; i < n; ++i) {
+          buf.write(string);
+        }
+        bench.end(n);
+      }
+  }
+}