benchmark: update manywrites back pressure

Make manywrites benchmark a bit more realistic by
taking back pressure into account. Otherwise
memory usage would no correspond well with
real world usage.

PR-URL: https://github.com/nodejs/node/pull/30977
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/benchmark/streams/writable-manywrites.js b/benchmark/streams/writable-manywrites.js
index 0ed38d0357a..ebd83779b76 100644
--- a/benchmark/streams/writable-manywrites.js
+++ b/benchmark/streams/writable-manywrites.js
@@ -20,8 +20,13 @@ function main({ n, sync }) {
   };
 
   bench.start();
-  for (var k = 0; k < n; ++k) {
-    s.write(b);
+
+  let k = 0;
+  function run() {
+    while (k++ < n && s.write(b));
+    if (k >= n)
+      bench.end(n);
   }
-  bench.end(n);
+  s.on('drain', run);
+  run();
 }