benchmark: adds groups to better separate benchmarks

Fixes: https://github.com/nodejs/node/issues/26425
Co-Authored-By: Yaman Kassir <mestery@protonmail.com>
PR-URL: https://github.com/nodejs/node/pull/54393
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

benchmark/http/headers.js

@@ -4,10 +4,22 @@ const common = require('../common.js');
 const http = require('http');
 
 const bench = common.createBenchmark(main, {
-  n: [10, 600],
-  len: [1, 100],
-  duration: 5,
-});
+  fewHeaders: {
+    n: [10],
+    len: [1, 5],
+    duration: 5,
+  },
+  mediumHeaders: {
+    n: [50],
+    len: [1, 10],
+    duration: 5,
+  },
+  manyHeaders: {
+    n: [600],
+    len: [1, 100],
+    duration: 5,
+  },
+}, { byGroups: true });
 
 function main({ len, n, duration }) {
   const headers = {
@@ -15,10 +27,9 @@ function main({ len, n, duration }) {
     'Transfer-Encoding': 'chunked',
   };
 
-  // TODO(BridgeAR): Change this benchmark to use grouped arguments when
-  // implemented. https://github.com/nodejs/node/issues/26425
-  const Is = [ ...Array(Math.max(n / len, 1)).keys() ];
-  const Js = [ ...Array(len).keys() ];
+  const Is = [...Array(n / len).keys()];
+  const Js = [...Array(len).keys()];
+
   for (const i of Is) {
     headers[`foo${i}`] = Js.map(() => `some header value ${i}`);
   }
@@ -27,6 +38,7 @@ function main({ len, n, duration }) {
     res.writeHead(200, headers);
     res.end();
   });
+
   server.listen(0, () => {
     bench.http({
       path: '/',