Function benchmarkConcurrentQueryMemory

benchmark/performance.js:678–711

* Benchmark: Concurrent Query GC Pressure * Measures max GC pause under concurrent load with large result sets. * Simulates production conditions where multiple clients query simultaneously, * compounding GC pressure from cursor batch sizes.

(name)

 * compounding GC pressure from cursor batch sizes.
 */
async function benchmarkConcurrentQueryMemory(name) {
  const TestObject = Parse.Object.extend('BenchmarkConcurrentResult');
  const TOTAL_OBJECTS = 3_000;
  const SAVE_BATCH_SIZE = 200;
  const CONCURRENT_QUERIES = 10;

  // Seed data in batches; ~8 KB per document so 3,000 docs ≈ 24 MB total,
  // exceeding MongoDB's 16 MiB default batch limit to test cursor batching
  for (let i = 0; i < TOTAL_OBJECTS; i += SAVE_BATCH_SIZE) {
    const batch = [];
    for (let j = 0; j < SAVE_BATCH_SIZE && i + j < TOTAL_OBJECTS; j++) {
      const obj = new TestObject();
      obj.set('category', (i + j) % 10);
      obj.set('value', i + j);
      obj.set('data', `padding-${i + j}-${'x'.repeat(8000)}`);
      batch.push(obj);
    }
    await Parse.Object.saveAll(batch);
  }

  return measureMemoryOperation({
    name,
    iterations: 50,
    operation: async () => {
      const queries = [];
      for (let i = 0; i < CONCURRENT_QUERIES; i++) {
        const query = new Parse.Query('BenchmarkConcurrentResult');
        query.limit(TOTAL_OBJECTS);
        queries.push(query.find({ useMasterKey: true }));
      }
      await Promise.all(queries);
    },
  });
}

/**
 * Benchmark: Query $regex