1 files changed, 8 insertions, 3 deletions
diff --git a/benchmark/streams/writable-manywrites.js b/benchmark/streams/writable-manywrites.js
index 6fcb07e849..0ed38d0357 100644
--- a/benchmark/streams/writable-manywrites.js
+++ b/benchmark/streams/writable-manywrites.js
@@ -4,14 +4,19 @@ const common = require('../common');
 const Writable = require('stream').Writable;
 
 const bench = common.createBenchmark(main, {
-  n: [2e6]
+  n: [2e6],
+  sync: ['yes', 'no']
 });
 
-function main({ n }) {
+function main({ n, sync }) {
   const b = Buffer.allocUnsafe(1024);
   const s = new Writable();
+  sync = sync === 'yes';
   s._write = function(chunk, encoding, cb) {
-    cb();
+    if (sync)
+      cb();
+    else
+      process.nextTick(cb);
   };
 
   bench.start();