Add warning when starting benchmark in headless mode
The benchmark API captures per-frame data from the game loop, which is bypassed when using step()-based simulation control. This warning informs users to use Python's time module for headless performance measurement instead. Also adds test_headless_benchmark.py which verifies: - step() and screenshot() don't produce benchmark frames - Wall-clock timing for headless operations - Complex scene throughput measurement 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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@ -1355,6 +1355,14 @@ PyObject* McRFPy_API::_setDevConsole(PyObject* self, PyObject* args) {
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// Benchmark logging implementation (#104)
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PyObject* McRFPy_API::_startBenchmark(PyObject* self, PyObject* args) {
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try {
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// Warn if in headless mode - benchmark frames are only recorded by the game loop
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if (game && game->isHeadless()) {
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PyErr_WarnEx(PyExc_UserWarning,
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"Benchmark started in headless mode. Note: step() and screenshot() do not "
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"record benchmark frames. The benchmark API captures per-frame data from the "
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"game loop, which is bypassed when using step()-based simulation control. "
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"For headless performance measurement, use Python's time module instead.", 1);
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}
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g_benchmarkLogger.start();
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Py_RETURN_NONE;
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} catch (const std::runtime_error& e) {
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@ -0,0 +1,166 @@
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#!/usr/bin/env python3
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"""
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Test benchmark API behavior in headless mode with step()
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=========================================================
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Verifies whether step() and screenshot() produce benchmark events.
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"""
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import mcrfpy
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from mcrfpy import automation
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import sys
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import os
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import json
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def run_tests():
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"""Run headless benchmark tests"""
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print("=== Headless Benchmark Tests ===\n")
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# Create a test scene
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mcrfpy.createScene("benchmark_test")
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mcrfpy.setScene("benchmark_test")
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ui = mcrfpy.sceneUI("benchmark_test")
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# Add some UI elements to have something to render
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frame = mcrfpy.Frame(pos=(100, 100), size=(200, 200))
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frame.fill_color = mcrfpy.Color(255, 0, 0)
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ui.append(frame)
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# Test 1: Start benchmark, call step() multiple times, check frame count
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print("Test 1: Benchmark with step() calls")
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mcrfpy.start_benchmark()
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# Make 10 step() calls
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for i in range(10):
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mcrfpy.step(0.016) # ~60fps frame time
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filename = mcrfpy.end_benchmark()
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print(f" Benchmark file: {filename}")
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# Check the benchmark file
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if os.path.exists(filename):
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with open(filename, 'r') as f:
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data = json.load(f)
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frame_count = data['benchmark']['total_frames']
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print(f" Total frames recorded: {frame_count}")
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if frame_count == 0:
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print(" NOTE: step() does NOT produce benchmark frames")
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print(" (Benchmark system is tied to main game loop)")
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else:
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print(f" step() produced {frame_count} benchmark frames")
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# Clean up
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os.remove(filename)
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else:
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print(" ERROR: Benchmark file not created")
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return False
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print()
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# Test 2: Benchmark with screenshots
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print("Test 2: Benchmark with screenshot() calls")
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mcrfpy.start_benchmark()
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# Make 5 screenshot calls
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for i in range(5):
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automation.screenshot(f"/tmp/bench_test_{i}.png")
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filename = mcrfpy.end_benchmark()
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print(f" Benchmark file: {filename}")
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if os.path.exists(filename):
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with open(filename, 'r') as f:
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data = json.load(f)
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frame_count = data['benchmark']['total_frames']
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print(f" Total frames recorded: {frame_count}")
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if frame_count == 0:
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print(" NOTE: screenshot() does NOT produce benchmark frames")
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else:
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print(f" screenshot() produced {frame_count} benchmark frames")
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# Clean up
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os.remove(filename)
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for i in range(5):
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if os.path.exists(f"/tmp/bench_test_{i}.png"):
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os.remove(f"/tmp/bench_test_{i}.png")
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print()
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# Test 3: Measure actual wall-clock time for headless operations
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print("Test 3: Wall-clock timing for headless operations")
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import time
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iterations = 10 # Keep low for test suite speed
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# Time step() calls
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start = time.perf_counter()
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for i in range(iterations):
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mcrfpy.step(0.016)
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step_time = time.perf_counter() - start
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print(f" {iterations} step() calls: {step_time*1000:.2f}ms ({step_time*1000/iterations:.3f}ms each)")
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# Time screenshot calls
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start = time.perf_counter()
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for i in range(iterations):
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automation.screenshot(f"/tmp/speed_test.png")
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screenshot_time = time.perf_counter() - start
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print(f" {iterations} screenshot() calls: {screenshot_time*1000:.2f}ms ({screenshot_time*1000/iterations:.3f}ms each)")
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# Time step + screenshot combined
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start = time.perf_counter()
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for i in range(iterations):
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mcrfpy.step(0.016)
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automation.screenshot(f"/tmp/speed_test.png")
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combined_time = time.perf_counter() - start
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print(f" {iterations} step+screenshot cycles: {combined_time*1000:.2f}ms ({combined_time*1000/iterations:.3f}ms each)")
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# Clean up
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if os.path.exists("/tmp/speed_test.png"):
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os.remove("/tmp/speed_test.png")
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print()
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# Test 4: Throughput test with complex scene
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print("Test 4: Complex scene throughput")
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# Add more UI elements
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for i in range(50):
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f = mcrfpy.Frame(pos=(i * 10, i * 5), size=(50, 50))
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f.fill_color = mcrfpy.Color(i * 5, 100, 200)
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ui.append(f)
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iterations = 5 # Keep low for test suite speed
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start = time.perf_counter()
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for i in range(iterations):
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mcrfpy.step(0.016)
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automation.screenshot(f"/tmp/complex_test.png")
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complex_time = time.perf_counter() - start
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fps_equivalent = iterations / complex_time
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print(f" {iterations} cycles with 51 UI elements: {complex_time*1000:.2f}ms")
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print(f" Equivalent FPS: {fps_equivalent:.1f}")
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print(f" Per-cycle time: {complex_time*1000/iterations:.3f}ms")
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# Clean up
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if os.path.exists("/tmp/complex_test.png"):
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os.remove("/tmp/complex_test.png")
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print()
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print("=== Headless Benchmark Tests Complete ===")
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return True
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# Main execution
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if __name__ == "__main__":
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try:
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if run_tests():
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print("\nPASS")
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sys.exit(0)
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else:
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print("\nFAIL")
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sys.exit(1)
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except Exception as e:
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print(f"\nFAIL: {e}")
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import traceback
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traceback.print_exc()
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sys.exit(1)
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