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009. C++ vs Python - Performance Comparison

Difficulty: 🟡 Medium
Category: Language Comparison
Tags: python, cpp, performance, benchmarking
Execution Type: ros2_publisher

Frequency: low

💡 Why This Problem Matters

Python is great for prototyping, logic, and glue code. C++ is used for tight control loops (1kHz+) and image processing. Knowing when to switch languages is a senior robotics engineer skill.

Problem Statement

Problem Statement

Performance is critical in robotics. Although Python is easier to write, high-frequency tasks often drift or consume high CPU. In this problem, you will implement a high-frequency publisher and measure its actual performance.

Requirements

  • Create a Python node named high_frequency_publisher
  • Publish an Int64 message to counter_topic at exactly 100 Hz (0.01s interval).
  • Logic: Increment a self.counter in every callback.
  • Performance Check: Every 100 messages, calculate and log the average frequency (Hz) or elapsed time.

Input/Output Format

Output:

  • Console Log: A message containing "Hz", "frequency", or "time" every 100 messages.

⚠️ Common Pitfalls

  • Timer drift: Python timers are not real-time; actual frequency may be slightly lower than 100Hz.
  • Blocking callbacks: Heavy logic in the callback will drop the frequency significantly.

📚 Helpful Resources

Test Cases

  • High frequency: 100 Hz publishing
  • Performance metrics: Timing logged
  • Counter accuracy: Correct increment

Similar Problems

  • Problem #7
  • Problem #8

Contributing

Found an issue with this problem's description, or have a better hint?
Open a PR or report it in Discussions.

Note: TestScripts and reference solutions are maintained by the SimuCode team
and are not part of this open spec. This ensures grading integrity on simucode.online.