process: improve memoryUsage() performance

Creating an object in JS and using a typed array to transfer values
from C++ to JS is faster than creating an object and setting
properties in C++.

The included benchmark shows ~34% increase in performance with this
change.

PR-URL: https://github.com/nodejs/node/pull/11497
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/benchmark/process/memoryUsage.js b/benchmark/process/memoryUsage.js
new file mode 100644
index 0000000000..d68ef339b4
--- /dev/null
+++ b/benchmark/process/memoryUsage.js
@@ -0,0 +1,16 @@
+'use strict';
+
+var common = require('../common.js');
+var bench = common.createBenchmark(main, {
+  n: [1e5]
+});
+
+function main(conf) {
+  var n = +conf.n;
+
+  bench.start();
+  for (var i = 0; i < n; i++) {
+    process.memoryUsage();
+  }
+  bench.end(n);
+}