🧠 MacBook Memory Benchmark

Test your L1, L2, and L3 cache performance — as well as memory bandwidth — right from your terminal.
This lightweight benchmark helps you understand how your Mac’s CPU caches handle Read, Write, and Copy operations.

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🚀 Features

• 🔍 Measures L1 / L2 / L3 cache and main memory performance
• ⚡ Tests Read, Write, and Copy speeds
• 💻 Optimized for Apple Silicon (M1 / M2 / M3) and Intel Mac
• 📈 Outputs clear performance results with automatic unit scaling

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🧰 Requirements

• macOS with g++ (Xcode Command Line Tools)
• C++17 compatible compiler
• Terminal access

To install Xcode tools (if needed):

xcode-select --install

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🛠️ Build & Run

Clone or copy the repository, then build and run the benchmark:

g++ -O3 -march=native -std=c++17 benchmark.cpp -o benchmark
./benchmark

✅ Tip: -O3 enables full optimization; -march=native uses all CPU features available on your Mac.

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📊 Example Output

AIDA-like (quick) Cache & Memory Benchmark
Memory    Read 8784.85  MB/s   Write 57156.84 MB/s   Copy 31403.20 MB/s   Latency 165.26 ns
L1        Read 10922.67 MB/s   Write 73691.15 MB/s   Copy 65536.00 MB/s   Latency 1.10   ns
L2        Read 10624.37 MB/s   Write 77672.30 MB/s   Copy 68018.68 MB/s   Latency 6.22   ns
L3        Read 10693.51 MB/s   Write 85670.89 MB/s   Copy 35567.91 MB/s   Latency 75.86  ns

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🧪 Use Cases

• Benchmarking after system updates
• Comparing different Mac models
• Evaluating CPU throttling or thermal performance
• Testing effects of memory pressure

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💡 Notes

• Results may vary slightly run to run due to background processes
• Best performance readings are with low system load
• Try closing heavy apps (e.g. Chrome, Xcode) before testing

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❤️ Enjoy & Contribute

Use this tool for fun, testing, or curiosity! Feel free to open issues or PRs if you want to add new features (like latency tests or threading).