Merge pull request #15742 from Kundan-CR7/feat/nested-array-benchmark

Add benchmark for large nested array documents (related to #9588)

Author: vkarpov15

benchmarks/nestedArrayLarge.js

@@ -0,0 +1,50 @@
+'use strict';
+
+const mongoose = require('../');
+
+run().catch(err => {
+    console.error(err);
+    process.exit(-1);
+});
+
+async function run() {
+    await mongoose.connect('mongodb://127.0.0.1:27017/mongoose_benchmark');
+
+    const bookSchema = new mongoose.Schema({
+        ticker: String,
+        asks: [[Number]],
+        bids: [[Number]],
+        timestamp: String,
+    });
+
+    const Book = mongoose.model('BookNestedArray', bookSchema);
+
+    const doc = { asks: [], bids: [] };
+    for (let i = 0; i < 10000; ++i) {
+        doc.asks.push([i]);
+        doc.bids.push([i]);
+    }
+
+    if (!process.env.MONGOOSE_BENCHMARK_SKIP_SETUP) {
+        await Book.deleteMany({});
+    }
+
+    const constructStart = Date.now();
+    for (let i = 0; i < 100; ++i) {
+        new Book(doc);
+    }
+    const constructEnd = Date.now();
+
+    const inst = new Book(doc);
+    const saveStart = Date.now();
+    await inst.save();
+    const saveEnd = Date.now();
+
+    const results = {
+        'document construction (100x) ms': +(constructEnd - constructStart).toFixed(2),
+        'save() time ms': +(saveEnd - saveStart).toFixed(2)
+    };
+
+    console.log(JSON.stringify(results, null, '  '));
+    process.exit(0);
+}