fix: prevent benchmark/publish infinite loop with path filters

[cloud-hai-vo]

Problem

When benchmark PRs merge to main, the push event can re-trigger benchmark and publish workflows — creating an infinite loop. The actor guard (github.actor != 'github-actions[bot]') was unreliable because auto-merge used PAT_TOKEN, making the merge actor the PAT owner instead of the bot.

Fix — Three-layer defense

1. Path filters (primary, deterministic)

• Benchmark workflow: only triggers on src/**, scripts/**, benchmarks.yml changes
• Publish workflow: only triggers on src/** changes
• README-only merges from benchmark PRs never match → no re-trigger

2. Actor guard (secondary safety net)

Both workflows keep github.actor != 'github-actions[bot]' as fallback.

3. Auto-merge uses GITHUB_TOKEN (not PAT_TOKEN)

• Merge actor is now github-actions[bot] instead of the PAT owner
• Actor guards work correctly as secondary defense
• PAT_TOKEN still used only for benchmark PR creation (required by org)

Expected flow after this fix

Code PR merges → benchmarks run (src/** changed) → creates README PR
  → CI runs → auto-merge squashes to main
  → push event fires but paths: only README.md → benchmark SKIPS ✓
  → publish SKIPS ✓

Test plan

• Merge this PR → should trigger benchmarks (workflow YAML changed is in paths)
• Benchmark PR created → CI runs on it (no [skip ci])
• Benchmark PR merges → no re-trigger of benchmark or publish

🤖 Generated with Claude Code

[github-actions]

📊 Benchmark Results

Generated: 2026-03-26 04:51 UTC  ·  Download full artifacts

Column guide:
Mean = average execution time  ·  Error = half of 99.9 % confidence interval  ·  StdDev = standard deviation  ·  Min / Median / Max = statistical range  ·  Ratio = vs Manual baseline (lower = closer to hand-written speed)  ·  RatioSD = ratio std dev  ·  Rank = 1 is fastest  ·  Gen0/1/2 = GC collections per 1 000 ops  ·  Allocated = managed heap per operation  ·  Alloc Ratio = allocation ratio vs baseline

🔵 Flat Mapping — 10-property object

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	15.04 ns	1.258 ns	0.069 ns	14.97 ns	15.04 ns	15.11 ns	1.00	0.01	1	0.0048	80 B	1.00
EggMapper	26.40 ns	8.424 ns	0.462 ns	26.00 ns	26.30 ns	26.91 ns	1.76	0.03	2	0.0048	80 B	1.00
AutoMapper	82.03 ns	1.778 ns	0.097 ns	81.94 ns	82.01 ns	82.13 ns	5.45	0.02	3	0.0048	80 B	1.00
Mapster	27.80 ns	0.985 ns	0.054 ns	27.74 ns	27.83 ns	27.83 ns	1.85	0.01	2	0.0048	80 B	1.00
MapperlyMap	15.53 ns	6.770 ns	0.371 ns	15.15 ns	15.56 ns	15.89 ns	1.03	0.02	1	0.0048	80 B	1.00
AgileMapper	493.30 ns	116.242 ns	6.372 ns	486.47 ns	494.37 ns	499.08 ns	32.80	0.39	4	0.0200	344 B	4.30
EggMapperGenerator	15.70 ns	9.889 ns	0.542 ns	15.23 ns	15.57 ns	16.30 ns	1.04	0.03	1	0.0048	80 B	1.00
EggMapperClassMapper	15.20 ns	6.255 ns	0.343 ns	14.84 ns	15.24 ns	15.52 ns	1.01	0.02	1	0.0048	80 B	1.00

🟡 Flattening — 2 nested objects → 8 flat properties

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	18.90 ns	1.561 ns	0.086 ns	18.81 ns	18.91 ns	18.98 ns	1.00	0.01	1	0.0048	80 B	1.00
EggMap	30.39 ns	9.201 ns	0.504 ns	30.04 ns	30.16 ns	30.97 ns	1.61	0.02	3	0.0048	80 B	1.00
AutoMapper	92.92 ns	5.924 ns	0.325 ns	92.71 ns	92.76 ns	93.30 ns	4.92	0.02	4	0.0048	80 B	1.00
Mapster	36.35 ns	12.615 ns	0.691 ns	35.90 ns	36.00 ns	37.15 ns	1.92	0.03	3	0.0048	80 B	1.00
MapperlyMap	23.36 ns	2.655 ns	0.146 ns	23.27 ns	23.29 ns	23.53 ns	1.24	0.01	2	0.0062	104 B	1.30
AgileMapper	496.86 ns	57.058 ns	3.128 ns	493.51 ns	497.39 ns	499.70 ns	26.29	0.18	5	0.0200	344 B	4.30

🟣 Deep Mapping — 2 nested address objects

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	53.52 ns	2.540 ns	0.139 ns	53.43 ns	53.46 ns	53.68 ns	1.00	0.00	1	0.0162	272 B	1.00
EggMapper	65.12 ns	24.329 ns	1.334 ns	63.81 ns	65.08 ns	66.48 ns	1.22	0.02	2	0.0162	272 B	1.00
AutoMapper	128.54 ns	45.874 ns	2.514 ns	126.18 ns	128.27 ns	131.18 ns	2.40	0.04	3	0.0162	272 B	1.00
Mapster	67.25 ns	22.293 ns	1.222 ns	65.84 ns	67.91 ns	68.00 ns	1.26	0.02	2	0.0162	272 B	1.00
MapperlyMap	53.15 ns	56.150 ns	3.078 ns	49.63 ns	54.48 ns	55.34 ns	0.99	0.05	1	0.0162	272 B	1.00
AgileMapper	519.46 ns	32.963 ns	1.807 ns	517.39 ns	520.28 ns	520.71 ns	9.71	0.04	4	0.0248	424 B	1.56

🟢 Complex Mapping — nested object + collection

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	70.79 ns	10.940 ns	0.600 ns	70.17 ns	70.84 ns	71.37 ns	1.00	0.01	1	0.0191	320 B	1.00
EggMapper	90.87 ns	25.561 ns	1.401 ns	89.41 ns	90.99 ns	92.21 ns	1.28	0.02	2	0.0191	320 B	1.00
AutoMapper	158.32 ns	21.687 ns	1.189 ns	156.96 ns	158.88 ns	159.13 ns	2.24	0.02	3	0.0196	328 B	1.02
Mapster	88.89 ns	9.991 ns	0.548 ns	88.28 ns	89.05 ns	89.34 ns	1.26	0.01	2	0.0191	320 B	1.00
MapperlyMap	72.00 ns	10.467 ns	0.574 ns	71.35 ns	72.23 ns	72.42 ns	1.02	0.01	1	0.0191	320 B	1.00
AgileMapper	577.60 ns	52.804 ns	2.894 ns	574.26 ns	579.17 ns	579.36 ns	8.16	0.07	4	0.0315	528 B	1.65

🟠 Collection — 100-item List<T>

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
Manual	1.731 μs	0.6117 μs	0.0335 μs	1.700 μs	1.727 μs	1.767 μs	1.00	0.02	1	0.5283	0.0172	8.65 KB	1.00
EggMapper	1.754 μs	0.2548 μs	0.0140 μs	1.740 μs	1.753 μs	1.768 μs	1.01	0.02	1	0.5283	0.0172	8.65 KB	1.00
AutoMapper	2.352 μs	0.6798 μs	0.0373 μs	2.314 μs	2.353 μs	2.389 μs	1.36	0.03	2	0.6065	0.0191	9.95 KB	1.15
Mapster	1.756 μs	0.2864 μs	0.0157 μs	1.740 μs	1.758 μs	1.771 μs	1.01	0.02	1	0.5283	0.0172	8.65 KB	1.00
MapperlyMap	1.819 μs	0.2305 μs	0.0126 μs	1.808 μs	1.816 μs	1.833 μs	1.05	0.02	1	0.5283	0.0172	8.65 KB	1.00
AgileMapper	2.538 μs	0.8063 μs	0.0442 μs	2.492 μs	2.542 μs	2.580 μs	1.47	0.03	2	0.5417	0.0153	8.91 KB	1.03

🟠 Collection — 100-item List<T>

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
Manual	5.321 μs	0.5789 μs	0.0317 μs	5.288 μs	5.322 μs	5.351 μs	1.00	0.01	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	5.915 μs	5.6239 μs	0.3083 μs	5.624 μs	5.882 μs	6.238 μs	1.11	0.05	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	6.712 μs	2.4001 μs	0.1316 μs	6.617 μs	6.658 μs	6.862 μs	1.26	0.02	1	1.7548	0.1068	28.7 KB	1.05
Mapster	5.808 μs	1.3360 μs	0.0732 μs	5.752 μs	5.781 μs	5.891 μs	1.09	0.01	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	5.297 μs	0.7160 μs	0.0392 μs	5.261 μs	5.293 μs	5.339 μs	1.00	0.01	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	5.228 μs	1.2442 μs	0.0682 μs	5.170 μs	5.211 μs	5.303 μs	0.98	0.01	1	1.0223	0.0610	16.72 KB	0.61

🟠 Collection — 100-item List<T>

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
Manual	17.34 μs	5.023 μs	0.275 μs	17.18 μs	17.19 μs	17.66 μs	1.00	0.02	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	17.50 μs	2.291 μs	0.126 μs	17.36 μs	17.57 μs	17.58 μs	1.01	0.02	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	21.08 μs	4.601 μs	0.252 μs	20.87 μs	21.02 μs	21.36 μs	1.22	0.02	1	5.7678	1.4343	94.34 KB	1.10
Mapster	17.57 μs	1.884 μs	0.103 μs	17.45 μs	17.60 μs	17.65 μs	1.01	0.01	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	19.45 μs	8.310 μs	0.456 μs	19.12 μs	19.27 μs	19.97 μs	1.12	0.03	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	20.11 μs	8.194 μs	0.449 μs	19.84 μs	19.86 μs	20.62 μs	1.16	0.03	1	5.2795	1.3123	86.25 KB	1.00

⚪ Startup / Configuration time

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
EggMapperStartup	1,339.970 μs	1,233.4463 μs	67.6094 μs	1,283.450 μs	1,321.591 μs	1,414.869 μs	1.002	0.06	3	3.9063	1.9531	94.48 KB	1.00
AutoMapperStartup	422.794 μs	1,110.5616 μs	60.8736 μs	361.480 μs	423.685 μs	483.217 μs	0.316	0.04	2	5.8594	-	104.22 KB	1.10
MapsterStartup	2.492 μs	0.4879 μs	0.0267 μs	2.468 μs	2.486 μs	2.521 μs	0.002	0.00	1	0.7019	0.0267	11.51 KB	0.12

EggMapper.Benchmarks.ColdStartBenchmark-report-github

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
EggMapper	1.279 ms	1.747 ms	0.0958 ms	1.185 ms	1.274 ms	1.376 ms	1.00	0.09	1	5.8594	-	95.56 KB	1.00
AutoMapper	4.072 ms	7.553 ms	0.4140 ms	3.695 ms	4.005 ms	4.515 ms	3.20	0.35	2	15.6250	7.8125	310.92 KB	3.25
Mapster	4.479 ms	8.312 ms	0.4556 ms	4.002 ms	4.524 ms	4.910 ms	3.52	0.38	2	39.0625	15.6250	757.76 KB	7.93

---

📝 Notes

• Each benchmark class is decorated with [MemoryDiagnoser] and [RankColumn].
• The global config (see src/EggMapper.Benchmarks/Program.cs) adds Min, Median, and Max columns.
• Manual is the hand-written baseline (ratio = 1.00). A ratio < 1 means faster than manual.
• Benchmarks run on GitHub-hosted runners — absolute times may vary between runs; focus on Ratio for comparisons.
• To reproduce locally:

  cd src/EggMapper.Benchmarks
  dotnet run --configuration Release -- --filter '*'