node: improve accessor perf of process.env

Set process.env array entries in JS.

PR-URL: https://github.com/nodejs/node/pull/3780
Reviewed-By: Fedor Indutny <fedor@indutny.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/benchmark/misc/bench-env.js b/benchmark/misc/bench-env.js
new file mode 100644
index 0000000000..66f966f587
--- /dev/null
+++ b/benchmark/misc/bench-env.js
@@ -0,0 +1,18 @@
+'use strict';
+
+const common = require('../common');
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+});
+
+
+function main(conf) {
+  const n = conf.n >>> 0;
+  bench.start();
+  for (var i = 0; i < n; i++) {
+    // Access every item in object to process values.
+    Object.keys(process.env);
+  }
+  bench.end(n);
+}