benchmark: make benchmarks runnable in older versions of Node.js

Also remove the require-cachable.js benchmarks because now all builtin
modules are cacheable, it would be comparing oranges to apples when
we try to compare the performance of loading all cacheable modules
in different Node.js binaries since the set of modules are just
different. Comparison of startup performance that involves loading
of the long-standing, stable builtins is already covered by the
require-builtins benchmark.

PR-URL: #45746
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

benchmark/common.js

@@ -38,7 +38,7 @@ class Benchmark {
     this.config = this.queue[0];
 
     process.nextTick(() => {
-      if (Object.hasOwn(process.env, 'NODE_RUN_BENCHMARK_FN')) {
+      if (process.env.NODE_RUN_BENCHMARK_FN !== undefined) {
         fn(this.config);
       } else {
         // _run will use fork() to create a new process for each configuration
@@ -91,7 +91,7 @@ class Benchmark {
         process.exit(1);
       }
       const [, key, value] = match;
-      if (Object.hasOwn(configs, key)) {
+      if (configs[key] !== undefined) {
         if (!cliOptions[key])
           cliOptions[key] = [];
         cliOptions[key].push(
@@ -290,10 +290,10 @@ function sendResult(data) {
   if (process.send) {
     // If forked, report by process send
     process.send(data, () => {
-      if (Object.hasOwn(process.env, 'NODE_RUN_BENCHMARK_FN')) {
+      if (process.env.NODE_RUN_BENCHMARK_FN !== undefined) {
         // If, for any reason, the process is unable to self close within
         // a second after completing, forcefully close it.
-        setTimeout(() => {
+        require('timers').setTimeout(() => {
           process.exit(0);
         }, 5000).unref();
       }

benchmark/misc/startup.js

@@ -1,80 +1,69 @@
 'use strict';
 const common = require('../common.js');
-const { spawn } = require('child_process');
+const { spawnSync } = require('child_process');
 const path = require('path');
 
 let Worker;  // Lazy loaded in main
 
 const bench = common.createBenchmark(main, {
-  dur: [1],
   script: [
     'benchmark/fixtures/require-builtins',
-    'benchmark/fixtures/require-cachable',
     'test/fixtures/semicolon',
   ],
-  mode: ['process', 'worker']
-}, {
-  flags: ['--expose-internals']
+  mode: ['process', 'worker'],
+  count: [30],
 });
 
-function spawnProcess(script) {
+function spawnProcess(script, bench, state) {
   const cmd = process.execPath || process.argv[0];
-  const argv = ['--expose-internals', script];
-  return spawn(cmd, argv);
-}
+  while (state.finished < state.count) {
+    const child = spawnSync(cmd, [script]);
+    if (child.status !== 0) {
+      console.log('---- STDOUT ----');
+      console.log(child.stdout.toString());
+      console.log('---- STDERR ----');
+      console.log(child.stderr.toString());
+      throw new Error(`Child process stopped with exit code ${child.status}`);
+    }
+    state.finished++;
+    if (state.finished === 0) {
+      // Finished warmup.
+      bench.start();
+    }
 
-function spawnWorker(script) {
-  return new Worker(script, { stderr: true, stdout: true });
+    if (state.finished === state.count) {
+      bench.end(state.count);
+    }
+  }
 }
 
-function start(state, script, bench, getNode) {
-  const node = getNode(script);
-  let stdout = '';
-  let stderr = '';
-
-  node.stdout.on('data', (data) => {
-    stdout += data;
-  });
-
-  node.stderr.on('data', (data) => {
-    stderr += data;
-  });
-
-  node.on('exit', (code) => {
+function spawnWorker(script, bench, state) {
+  const child = new Worker(script);
+  child.on('exit', (code) => {
     if (code !== 0) {
-      console.error('------ stdout ------');
-      console.error(stdout);
-      console.error('------ stderr ------');
-      console.error(stderr);
-      throw new Error(`Error during node startup, exit code ${code}`);
+      throw new Error(`Worker stopped with exit code ${code}`);
     }
-    state.throughput++;
-
-    if (state.go) {
-      start(state, script, bench, getNode);
+    state.finished++;
+    if (state.finished === 0) {
+      // Finished warmup.
+      bench.start();
+    }
+    if (state.finished < state.count) {
+      spawnProcess(script, bench, state);
     } else {
-      bench.end(state.throughput);
+      bench.end(state.count);
     }
   });
 }
 
-function main({ dur, script, mode }) {
-  const state = {
-    go: true,
-    throughput: 0
-  };
-
-  setTimeout(() => {
-    state.go = false;
-  }, dur * 1000);
-
+function main({ count, script, mode }) {
   script = path.resolve(__dirname, '../../', `${script}.js`);
+  const warmup = 3;
+  const state = { count, finished: -warmup };
   if (mode === 'worker') {
     Worker = require('worker_threads').Worker;
-    bench.start();
-    start(state, script, bench, spawnWorker);
+    spawnWorker(script, bench, state);
   } else {
-    bench.start();
-    start(state, script, bench, spawnProcess);
+    spawnProcess(script, bench, state);
   }
 }