benchmark: include writev in benchmark

Currently we only consider write when benchmarking.

PR-URL: https://github.com/nodejs/node/pull/31066
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

benchmark/streams/writable-manywrites.js

@@ -5,25 +5,36 @@ const Writable = require('stream').Writable;
 
 const bench = common.createBenchmark(main, {
   n: [2e6],
-  sync: ['yes', 'no']
+  sync: ['yes', 'no'],
+  writev: ['yes', 'no'],
+  callback: ['yes', 'no']
 });
 
-function main({ n, sync }) {
+function main({ n, sync, writev, callback }) {
   const b = Buffer.allocUnsafe(1024);
   const s = new Writable();
   sync = sync === 'yes';
-  s._write = function(chunk, encoding, cb) {
+
+  const writecb = (cb) => {
     if (sync)
       cb();
     else
       process.nextTick(cb);
   };
 
+  if (writev === 'yes') {
+    s._writev = (chunks, cb) => writecb(cb);
+  } else {
+    s._write = (chunk, encoding, cb) => writecb(cb);
+  }
+
+  const cb = callback === 'yes' ? () => {} : null;
+
   bench.start();
 
   let k = 0;
   function run() {
-    while (k++ < n && s.write(b));
+    while (k++ < n && s.write(b, cb));
     if (k >= n)
       bench.end(n);
   }

test/benchmark/test-benchmark-streams.js

@@ -9,6 +9,8 @@ runBenchmark('streams',
                'kind=duplex',
                'n=1',
                'sync=no',
+               'writev=no',
+               'callback=no',
                'type=buffer',
              ],
              { NODEJS_BENCHMARK_ZERO_ALLOWED: 1 });