Benchmarks

Detailed performance comparisons.

Test Environment

• OS: Linux 6.x
• CPU: Multi-core system
• Test: 100 C source files
• Toolchain: GCC

Build Times

Full Build (Cold)

Tool	Time	Notes
ninja	2.63s	Average of 5 runs
rninja	1.79s	First cold run
rninja (cached)	0.15s	With cache

No-op Build

Tool	Time	Notes
ninja	0.23s	After warmup
rninja	0.01s	Fast-path

Improvement: 23x faster

Incremental Build

After modifying one file:

Tool	Time
ninja	0.45s
rninja	0.12s

Speedup by Scenario

Scenario	Speedup
No-op builds	10-23x
Cached rebuilds	10-20x
Warm incremental	2-5x
Cold builds	1.3-2x
CI with remote cache	2-5x

Running Benchmarks

# Generate benchmark project
python3 scripts/gen_bench.py 100

# Benchmark ninja
rm -f *.o .ninja_log
time ninja

# Benchmark rninja
rm -f *.o .ninja_log
time rninja

Benchmark Tips

1. Run multiple iterations
2. Use hyperfine for accurate timing
3. Test with warm and cold caches
4. Profile with --trace