Add Benchmark Suite

[Virviil]

Description

Create performance benchmarks using criterion.rs for different image sizes and scenarios to measure and track oci2git performance over time.

Tasks

• Add criterion.rs dependency and benchmark setup
• Create benches/ directory with benchmark tests
• Benchmark different image sizes (small <100MB, medium 100MB-1GB, large >1GB)
• Benchmark different image types (Alpine, Ubuntu, multi-stage builds)
• Benchmark different container engines (docker, nerdctl, tar)
• Add memory usage profiling
• Create performance regression testing
• Generate benchmark reports and documentation

Skills Required

• Rust programming
• criterion.rs benchmarking framework
• Performance analysis and profiling
• Statistical analysis of benchmark results

Benchmark Categories

1. Image Processing Speed: Time to convert images of different sizes
2. Memory Usage: Peak memory consumption during processing
3. Engine Comparison: Performance differences between docker/nerdctl/tar
4. Git Operations: Time spent on Git repository creation and commits
5. I/O Performance: File system operations and temporary data handling

Files to Create

• benches/image_processing.rs - Main image processing benchmarks
• benches/engine_comparison.rs - Container engine performance comparison
• benches/memory_usage.rs - Memory profiling benchmarks

Test Images for Benchmarking

• Small: alpine:latest (~5MB)
• Medium: ubuntu:latest (~70MB)
• Large: node:latest (~1GB)
• Complex: Multi-stage build images

Expected Deliverables

• Automated benchmark suite
• Performance baseline documentation
• CI integration for performance regression detection

This is an intermediate task perfect for Hacktoberfest! 🎃

Hacktoberfest 2025 🍂