New Workload: Babylon class-heavy workload (#143)

Applying the same cache-busting pattern, I've created a [Babylon.js](https://github.com/BabylonJS/Babylon.js)-based startup workload.

- Startup Version (parse - first-eval focused):
  - Eval a new string on every second iteration (configurable)
  - Load all class names from the babylon module
  - Set up a basic scene and run a few frames (configurable)
- Scene Version (JS execution focused):
  - Does not measure startup 
  - Sets up complex scene (parsing .glb blobs)
  - Renders and animates 100 frames

There is an ES6 and ES5 version of the same workload and they both heavily stress parse+top-level setup code with many classes.

Author: camillobruni

JetStreamDriver.js

@@ -2603,6 +2603,68 @@ let BENCHMARKS = [
         allowUtf16: true,
         tags: ["default", "Wasm"],
     }),
+    new AsyncBenchmark({
+        name: "babylonjs-startup-es5",
+        files: [
+            "./utils/StartupBenchmark.js",
+            "./babylonjs/benchmark/startup.js",
+        ],
+        preload: {
+            BUNDLE: "./babylonjs/dist/bundle.es5.min.js",
+        },
+        arguments: {
+            expectedCacheCommentCount: 23988,
+        },
+        tags: ["startup",  "js", "class", "es5", "babylonjs"],
+        iterations: 10,
+    }),
+    new AsyncBenchmark({
+        name: "babylonjs-startup-es6",
+        files: [
+            "./utils/StartupBenchmark.js",
+            "./babylonjs/benchmark/startup.js",
+        ],
+        preload: {
+            BUNDLE: "./babylonjs/dist/bundle.es6.min.js",
+        },
+        arguments: {
+            expectedCacheCommentCount: 21222,
+        },
+        tags: ["Default",  "js", "startup", "class", "es6", "babylonjs"],
+        iterations: 10,
+    }),
+    new AsyncBenchmark({
+        name: "babylonjs-scene-es5",
+        files: [
+            // Use non-minified sources for easier profiling:
+            // "./babylonjs/dist/bundle.es5.js",
+            "./babylonjs/dist/bundle.es5.min.js",
+            "./babylonjs/benchmark/scene.js",
+        ],
+        preload: {
+            PARTICLES_BLOB: "./babylonjs/data/particles.json",
+            PIRATE_FORT_BLOB: "./babylonjs/data/pirateFort.glb",
+            CANNON_BLOB: "./babylonjs/data/cannon.glb",
+        },
+        tags: ["scene", "js",  "es5", "babylonjs"],
+        iterations: 5,
+    }),
+    new AsyncBenchmark({
+        name: "babylonjs-scene-es6",
+        files: [
+            // Use non-minified sources for easier profiling:
+            // "./babylonjs/dist/bundle.es6.js",
+            "./babylonjs/dist/bundle.es6.min.js",
+            "./babylonjs/benchmark/scene.js",
+        ],
+        preload: {
+            PARTICLES_BLOB: "./babylonjs/data/particles.json",
+            PIRATE_FORT_BLOB: "./babylonjs/data/pirateFort.glb",
+            CANNON_BLOB: "./babylonjs/data/cannon.glb",
+        },
+        tags: ["Default", "js", "scene", "es6", "babylonjs"],
+        iterations: 5,
+    }),
     // WorkerTests
     new AsyncBenchmark({
         name: "bomb-workers",

babylonjs/README.md

@@ -0,0 +1,34 @@
+# Babylon.js Benchmarks for JetStream
+
+This project contains two benchmarks for testing the performance of the Babylon.js 3D engine.
+
+## Build Instructions
+
+```bash
+# install required node packages.
+npm ci
+# build the workload, output is ./dist
+npm run build
+```
+
+## Workloads
+
+There are two distinct workloads in this benchmark suite:
+
+### 1. Startup Workload
+
+This benchmark measures the time it takes for the Babylon.js engine to initialize. It evaluates a large, bundled source file and measures the time to parse the code and execute a simple test. This workload is primarily focused on parse and startup time.
+
+To run this benchmark in node for testing:
+```bash
+npm run test:startup
+```
+
+### 2. Scene Workload
+
+This benchmark measures the rendering performance of a complex 3D scene. It loads 3D models (`.glb` files), animations, and particle systems, and then renders the scene for a number of frames. 
+
+To run this benchmark in node for testing:
+```bash
+npm run test:scene
+```

babylonjs/benchmark/scene-node.mjs

@@ -0,0 +1,25 @@
+import { runComplexScene } from "../src/babylon-js-benchmark.mjs";
+import { promises as fs } from "fs";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const fortPath = path.resolve(__dirname, "../data/pirateFort.glb");
+const cannonPath = path.resolve(__dirname, "../data/cannon.glb");
+const particlePath = path.resolve(__dirname, "../data/particles.json");
+
+async function main() {
+    try {
+    const fortBuffer = await fs.readFile(fortPath);
+    const cannonBuffer = await fs.readFile(cannonPath);
+    const particleData = JSON.parse(await fs.readFile(particlePath, "utf-8"))
+    const {classNames, cameraRotationLength} = await runComplexScene(fortBuffer, cannonBuffer, particleData, 1000);
+    } catch(e) {
+        console.error(e);
+        console.error(e.stack);
+    }
+}
+
+main();

babylonjs/benchmark/scene.js

@@ -0,0 +1,53 @@
+// console.log = () => {};
+
+globalThis.setTimeout = (callback, timeout) => callback();
+globalThis.requestAnimationFrame = (callback) => callback();
+
+// JetStream benchmark.
+class Benchmark {
+  iterationCount = 0;
+  preloaded = {
+    fortData: null,
+    cannonData: null,
+    particlesJson: null,
+  };
+
+  constructor(iterationCount) {
+    this.iterationCount = iterationCount;
+  }
+
+  async init() {
+    const [fort, cannon, particles] = await Promise.all([
+      JetStream.getBinary(JetStream.preload.PIRATE_FORT_BLOB),
+      JetStream.getBinary(JetStream.preload.CANNON_BLOB),
+      JetStream.getString(JetStream.preload.PARTICLES_BLOB),
+    ]);
+    this.preloaded.fortData = fort;
+    this.preloaded.cannonData = cannon;
+    this.preloaded.particlesJson = JSON.parse(particles);
+  }
+
+  async runIteration() {
+    const {classNames, cameraRotationLength} = await BabylonJSBenchmark.runComplexScene(
+      this.preloaded.fortData,
+      this.preloaded.cannonData,
+      this.preloaded.particlesJson,
+      100
+    );
+    const lastResult = {
+      classNames,
+      cameraRotationLength
+    };
+    this.validateIteration(lastResult);
+  }
+
+  validateIteration(lastResult) {
+    this.expect("this.lastResult.classNames.length", lastResult.classNames.length, 2135);
+    this.expect("this.lastResult.cameraRotationLength", lastResult.cameraRotationLength, 0);
+  }
+
+  expect(name, value, expected) {
+    if (value != expected)
+      throw new Error(`Expected ${name} to be ${expected}, but got ${value}`);
+  }
+}

babylonjs/benchmark/startup-node.mjs

@@ -0,0 +1,3 @@
+import { runTest } from "../src/babylon-js-benchmark.mjs";
+
+console.log(runTest());

babylonjs/benchmark/startup.js

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2025 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// console.log = () => {};
+
+class Benchmark extends StartupBenchmark {
+  iteration = 0;
+
+  constructor({iterationCount, expectedCacheCommentCount}) {
+    super({
+      iterationCount,
+      codeReuseCount: 2,
+      expectedCacheCommentCount,
+    });
+  }
+
+  runIteration() {
+    const sourceCode = this.iterationSourceCodes[this.iteration];
+    if (!sourceCode)
+      throw new Error(`Could not find source for iteration ${this.iteration}`);
+    // Module in sourceCode it assigned to the ClassStartupTest variable.
+    let BabylonJSBenchmark;
+
+    // let initStart = performance.now();
+    eval(sourceCode);
+    // const runStart = performance.now();
+
+    const { classNames, cameraRotationLength } = BabylonJSBenchmark.runTest(30);
+    const lastResult = {
+      classNames,
+      cameraRotationLength,
+    };
+    this.validateIteration(lastResult)
+    // const end = performance.now();
+    // const loadTime = runStart - initStart;
+    // const runTime = end - runStart;
+    // For local debugging:
+    // print(`Iteration ${this.iteration}:`);
+    // print(`  Load time: ${loadTime.toFixed(2)}ms`);
+    // print(`  Render time: ${runTime.toFixed(2)}ms`);
+    this.iteration++;
+  }
+
+  validateIteration(lastResult) {
+    this.expect(
+      "this.lastResult.classNames.length",
+      lastResult.classNames.length,
+      2135
+    );
+    this.expect(
+      "this.lastResult.cameraRotationLength",
+      Math.round(lastResult.cameraRotationLength * 1000),
+      464
+    );
+  }
+
+  expect(name, value, expected) {
+    if (value != expected)
+      throw new Error(`Expected ${name} to be ${expected}, but got ${value}`);
+  }
+}

babylonjs/build/build.mjs

@@ -0,0 +1,30 @@
+
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const SNIPPET_URL = 'https://snippet.babylonjs.com/LCBQ5Y/6';
+const RAW_SNIPPET_PATH = path.resolve(__dirname, '../data/snippets.LCBQ5Y.raw.json');
+const PARTICLES_PATH = path.resolve(__dirname, '../data/particles.json');
+
+async function main() {
+  const response = await fetch(SNIPPET_URL);
+  if (!response.ok) {
+    throw new Error(`Failed to download file: ${response.status} ${response.statusText}`);
+  }
+  const snippetJson = await response.json();
+
+  console.log(`Saving raw snippet: ${RAW_SNIPPET_PATH}`);
+  fs.writeFileSync(RAW_SNIPPET_PATH, JSON.stringify(snippetJson));
+
+  const jsonPayload = JSON.parse(snippetJson.jsonPayload);
+  const particleSystem = JSON.parse(jsonPayload.particleSystem);
+
+  console.log(`Saving particles: ${PARTICLES_PATH}:`);
+  fs.writeFileSync(PARTICLES_PATH, JSON.stringify(particleSystem, null, 2));
+}
+
+main();