benchmark: add benchmark for dns.promises.lookup()

Adding this benchmark will let us check the performance implications of
https://github.com/nodejs/node/pull/27081.

PR-URL: https://github.com/nodejs/node/pull/27249
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/benchmark/dns/lookup-promises.js b/benchmark/dns/lookup-promises.js
new file mode 100644
index 0000000000..a74c856cd3
--- /dev/null
+++ b/benchmark/dns/lookup-promises.js
@@ -0,0 +1,31 @@
+'use strict';
+
+const common = require('../common.js');
+const { lookup } = require('dns').promises;
+
+const bench = common.createBenchmark(main, {
+  name: ['127.0.0.1', '::1'],
+  all: ['true', 'false'],
+  n: [5e6]
+});
+
+function main({ name, n, all }) {
+  if (all === 'true') {
+    const opts = { all: true };
+    bench.start();
+    (async function cb() {
+      for (let i = 0; i < n; i++) {
+        await lookup(name, opts);
+      }
+    })();
+    bench.end(n);
+  } else {
+    bench.start();
+    (async function cb() {
+      for (let i = 0; i < n; i++) {
+        await lookup(name);
+      }
+    })();
+    bench.end(n);
+  }
+}