perf(runtime): short-circuit `queue_async_op` for Poll::Ready (#15773)

1 files changed, 22 insertions, 0 deletions

diff --git a/cli/bench/tcp.js b/cli/bench/tcp.js
new file mode 100644
index 000000000..826f5f87b
--- /dev/null
+++ b/cli/bench/tcp.js
@@ -0,0 +1,22 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+const listener = Deno.listen({ port: 4500 });
+const response = new TextEncoder().encode(
+  "HTTP/1.1 200 OK\r\nContent-Length: 12\r\n\r\nHello World\n",
+);
+
+// Accept a connection and write packets as fast as possible.
+async function acceptWrite() {
+  const conn = await listener.accept();
+  try {
+    while (true) {
+      await conn.write(response);
+    }
+  } catch {
+    // Pass
+  }
+  conn.close();
+}
+
+await acceptWrite();
+await acceptWrite();