fs: improve performance for sync stat() functions

PR-URL: https://github.com/nodejs/node/pull/11522
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 25 insertions, 7 deletions

diff --git a/benchmark/fs/bench-statSync.js b/benchmark/fs/bench-statSync.js
index ba1e8168b4a..4bc2ecd65a3 100644
--- a/benchmark/fs/bench-statSync.js
+++ b/benchmark/fs/bench-statSync.js
@@ -5,17 +5,35 @@ const fs = require('fs');
 
 const bench = common.createBenchmark(main, {
   n: [1e4],
-  kind: ['lstatSync', 'statSync']
+  kind: ['fstatSync', 'lstatSync', 'statSync']
 });
 
 
 function main(conf) {
   const n = conf.n >>> 0;
-  const fn = fs[conf.kind];
-
-  bench.start();
-  for (var i = 0; i < n; i++) {
-    fn(__filename);
+  var fn;
+  var i;
+  switch (conf.kind) {
+    case 'statSync':
+    case 'lstatSync':
+      fn = fs[conf.kind];
+      bench.start();
+      for (i = 0; i < n; i++) {
+        fn(__filename);
+      }
+      bench.end(n);
+      break;
+    case 'fstatSync':
+      fn = fs.fstatSync;
+      const fd = fs.openSync(__filename, 'r');
+      bench.start();
+      for (i = 0; i < n; i++) {
+        fn(fd);
+      }
+      bench.end(n);
+      fs.closeSync(fd);
+      break;
+    default:
+      throw new Error('Invalid kind argument');
   }
-  bench.end(n);
 }