add benchmark

Author: gurgunday

benchmark/buffers/fast-buffer.js

@@ -0,0 +1,31 @@
+'use strict';
+
+// flags: --expose-internals
+
+const common = require('../common');
+const { FastBuffer } = require('internal/buffer');
+
+const bench = common.createBenchmark(main, {
+  n: [1e6],
+  operation: ['fastbuffer', 'bufferalloc'],
+});
+
+
+function main({ n, operation }) {
+  switch (operation) {
+    case 'fastbuffer':
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        new FastBuffer();
+      }
+      bench.end(n);
+      break;
+    case 'bufferalloc':
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        Buffer.alloc(0);
+      }
+      bench.end(n);
+      break;
+  }
+}