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carlos-alm merged 2 commits into from
Mar 12, 2026
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docs: update build performance benchmarks (3.1.3) #423

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docs: update build performance benchmarks (3.1.3)
github-actions[bot] Mar 12, 2026
30578ee
Merge branch 'main' into benchmark/build-v3.1.3-20260312-021418
carlos-alm Mar 12, 2026
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10 changes: 5 additions & 5 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -562,14 +562,14 @@ Self-measured on every release via CI ([build benchmarks](generated/benchmarks/B

| Metric | Latest |
|---|---|
| Build speed (native) | **5.2 ms/file** |
| Build speed (WASM) | **15 ms/file** |
| Build speed (native) | **5.1 ms/file** |
| Build speed (WASM) | **14.6 ms/file** |
| Query time | **4ms** |
| No-op rebuild (native) | **6ms** |
| 1-file rebuild (native) | **296ms** |
| Query: fn-deps | **0.8ms** |
| 1-file rebuild (native) | **282ms** |
| Query: fn-deps | **0.9ms** |
| Query: path | **0.8ms** |
| ~50,000 files (est.) | **~260.0s build** |
| ~50,000 files (est.) | **~255.0s build** |

Metrics are normalized per file for cross-version comparability. Times above are for a full initial build — incremental rebuilds only re-parse changed files.

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155 changes: 132 additions & 23 deletions generated/benchmarks/BUILD-BENCHMARKS.md
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Expand Up @@ -5,6 +5,8 @@ Metrics are normalized per file for cross-version comparability.

| Version | Engine | Date | Files | Build (ms/file) | Query (ms) | Nodes/file | Edges/file | DB (bytes/file) |
|---------|--------|------|------:|----------------:|-----------:|-----------:|-----------:|----------------:|
| 3.1.3 | native | 2026-03-12 | 236 | 5.1 ~ | 3.9 ↓7% | 18 ~ | 39.4 ↑2% | 65553 ~ |
| 3.1.3 | wasm | 2026-03-12 | 236 | 14.6 ↓3% | 5.5 ↓5% | 18 ~ | 39.6 ~ | 63037 ~ |
| 3.1.2 | native | 2026-03-11 | 235 | 5.2 ↓15% | 4.2 ↑24% | 17.9 ↓14% | 38.6 ↓14% | 65275 ↓19% |
| 3.1.2 | wasm | 2026-03-11 | 235 | 15 ↓9% | 5.8 ↑26% | 17.9 ↓14% | 39.3 ↓13% | 62207 ↓20% |
| 3.1.0 | native | 2026-03-08 | 180 | 6.1 ~ | 3.4 ↑3% | 20.8 ~ | 44.7 ~ | 80919 ↑14% |
Expand Down Expand Up @@ -41,52 +43,54 @@ Metrics are normalized per file for cross-version comparability.
|--------|-------|
| Build time | 1.2s |
| Query time | 4ms |
| Nodes | 4,198 |
| Edges | 9,063 |
| DB size | 14.6 MB |
| Files | 235 |
| Nodes | 4,245 |
| Edges | 9,305 |
| DB size | 14.8 MB |
| Files | 236 |

#### WASM

| Metric | Value |
|--------|-------|
| Build time | 3.5s |
| Build time | 3.4s |
| Query time | 6ms |
| Nodes | 4,202 |
| Edges | 9,240 |
| DB size | 13.9 MB |
| Files | 235 |
| Nodes | 4,249 |
| Edges | 9,349 |
| DB size | 14.2 MB |
| Files | 236 |

### Build Phase Breakdown (latest)

| Phase | Native (build) | WASM (build) | Native (1-file) | WASM (1-file) |
|-------|---------------:|-------------:|----------------:|--------------:|
| Parse | 421.6 ms | 1421.3 ms | 86.6 ms | 239.4 ms |
| Insert nodes | 100.2 ms | 103.2 ms | 11.7 ms | 11.1 ms |
| Resolve imports | 4.5 ms | 8.9 ms | 1.3 ms | 1.6 ms |
| Build edges | 70 ms | 158.5 ms | 17.1 ms | 52 ms |
| Structure | 19.9 ms | 23.7 ms | 9.4 ms | 9.6 ms |
| Roles | 29.6 ms | 23.8 ms | 32.8 ms | 26.2 ms |
| AST nodes | 335.7 ms | 345.1 ms | 20.9 ms | 21.4 ms |
| Complexity | 13.1 ms | 5.3 ms | 1.2 ms | 0.5 ms |
| CFG | 116.8 ms | 115.4 ms | 5.7 ms | 6.4 ms |
| Dataflow | 84.8 ms | 92.1 ms | 4.5 ms | 5.1 ms |
| Parse | 420.1 ms | 1334.3 ms | 82.1 ms | 226 ms |
| Insert nodes | 96.5 ms | 97.3 ms | 10.3 ms | 10.2 ms |
| Resolve imports | 4.7 ms | 8.5 ms | 1.7 ms | 1.6 ms |
| Build edges | 70 ms | 137 ms | 17.4 ms | 35 ms |
| Structure | 20.8 ms | 21 ms | 11 ms | 9.2 ms |
| Roles | 27.1 ms | 24.4 ms | 25.1 ms | 22.5 ms |
| AST nodes | 321.5 ms | 327.9 ms | 18.7 ms | 23.1 ms |
| Complexity | 12.6 ms | 72.6 ms | 1.3 ms | 3 ms |
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WASM complexity phase spike warrants investigation

The WASM Complexity phase shows a dramatic increase from 5.3 ms → 72.6 ms (≈13.7× slower) compared to 3.1.2, while the native Complexity phase barely changed (13.1 ms → 12.6 ms). The WASM 1-file rebuild complexity also regressed from 0.5 ms → 3 ms (6×).

Prior to 3.1.3, native was ~2.5× slower than WASM for this phase — now WASM is ~5.8× slower than native. That polarity flip is unusual for a compute-intensive phase and may indicate:

  • A code path change in 3.1.3 that exercises a WASM-unfriendly pattern (e.g., heavy cross-function calls, tight loops over large data structures)
  • A cold-cache anomaly specific to the WASM JIT for this run

The overall WASM build time still improved (3.5 s → 3.4 s) because savings in other phases compensated, so this regression is masked at the top-level. If this wasn't intentional it may be worth investigating the complexity pass in the WASM engine for 3.1.3 before the numbers are taken as the new baseline.

| CFG | 114.1 ms | 112.8 ms | 8.7 ms | 5.3 ms |
| Dataflow | 88.6 ms | 87.1 ms | 4 ms | 4.1 ms |

### Estimated performance at 50,000 files

Extrapolated linearly from per-file metrics above.

| Metric | Native (Rust) | WASM |
|--------|---:|---:|
| Build time | 260.0s | 750.0s |
| DB size | 3112.6 MB | 2966.3 MB |
| Nodes | 895,000 | 895,000 |
| Edges | 1,930,000 | 1,965,000 |
| Build time | 255.0s | 730.0s |
| DB size | 3125.8 MB | 3005.8 MB |
| Nodes | 900,000 | 900,000 |
| Edges | 1,970,000 | 1,980,000 |

### Incremental Rebuilds

| Version | Engine | No-op (ms) | 1-file (ms) |
|---------|--------|----------:|-----------:|
| 3.1.3 | native | 6 ~ | 282 ↓5% |
| 3.1.3 | wasm | 6 ↓14% | 493 ↓12% |
| 3.1.2 | native | 6 ↑20% | 296 ↓11% |
| 3.1.2 | wasm | 7 ↑40% | 563 ~ |
| 3.1.0 | native | 5 ↓98% | 332 ~ |
Expand All @@ -113,6 +117,8 @@ Extrapolated linearly from per-file metrics above.

| Version | Engine | fn-deps (ms) | fn-impact (ms) | path (ms) | roles (ms) |
|---------|--------|------------:|--------------:|----------:|----------:|
| 3.1.3 | native | 0.9 ↑12% | 0.8 ~ | 0.8 ~ | 7.4 ↓14% |
| 3.1.3 | wasm | 0.8 ↓11% | 0.9 ~ | 0.8 ↓11% | 7.7 ↓7% |
| 3.1.2 | native | 0.8 ~ | 0.8 ~ | 0.8 ~ | 8.6 ↑34% |
| 3.1.2 | wasm | 0.9 ↑12% | 0.9 ↑12% | 0.9 ↑12% | 8.3 ↑28% |
| 3.1.0 | native | 0.8 ~ | 0.8 ~ | 0.8 ~ | 6.4 ↑7% |
Expand Down Expand Up @@ -164,6 +170,109 @@ pre-parse that previously added ~388ms on native builds.

<!-- BENCHMARK_DATA
[
{
"version": "3.1.3",
"date": "2026-03-12",
"files": 236,
"wasm": {
"buildTimeMs": 3443,
"queryTimeMs": 5.5,
"nodes": 4249,
"edges": 9349,
"dbSizeBytes": 14876672,
"perFile": {
"buildTimeMs": 14.6,
"nodes": 18,
"edges": 39.6,
"dbSizeBytes": 63037
},
"noopRebuildMs": 6,
"oneFileRebuildMs": 493,
"oneFilePhases": {
"setupMs": 36.6,
"parseMs": 226,
"insertMs": 10.2,
"resolveMs": 1.6,
"edgesMs": 35,
"structureMs": 9.2,
"rolesMs": 22.5,
"astMs": 23.1,
"complexityMs": 3,
"cfgMs": 5.3,
"dataflowMs": 4.1,
"finalizeMs": 10.9
},
"queries": {
"fnDepsMs": 0.8,
"fnImpactMs": 0.9,
"pathMs": 0.8,
"rolesMs": 7.7
},
"phases": {
"setupMs": 23.3,
"parseMs": 1334.3,
"insertMs": 97.3,
"resolveMs": 8.5,
"edgesMs": 137,
"structureMs": 21,
"rolesMs": 24.4,
"astMs": 327.9,
"complexityMs": 72.6,
"cfgMs": 112.8,
"dataflowMs": 87.1,
"finalizeMs": 42.5
}
},
"native": {
"buildTimeMs": 1202,
"queryTimeMs": 3.9,
"nodes": 4245,
"edges": 9305,
"dbSizeBytes": 15470592,
"perFile": {
"buildTimeMs": 5.1,
"nodes": 18,
"edges": 39.4,
"dbSizeBytes": 65553
},
"noopRebuildMs": 6,
"oneFileRebuildMs": 282,
"oneFilePhases": {
"setupMs": 35.8,
"parseMs": 82.1,
"insertMs": 10.3,
"resolveMs": 1.7,
"edgesMs": 17.4,
"structureMs": 11,
"rolesMs": 25.1,
"astMs": 18.7,
"complexityMs": 1.3,
"cfgMs": 8.7,
"dataflowMs": 4,
"finalizeMs": 5
},
"queries": {
"fnDepsMs": 0.9,
"fnImpactMs": 0.8,
"pathMs": 0.8,
"rolesMs": 7.4
},
"phases": {
"setupMs": 11.9,
"parseMs": 420.1,
"insertMs": 96.5,
"resolveMs": 4.7,
"edgesMs": 70,
"structureMs": 20.8,
"rolesMs": 27.1,
"astMs": 321.5,
"complexityMs": 12.6,
"cfgMs": 114.1,
"dataflowMs": 88.6,
"finalizeMs": 11.8
}
}
},
{
"version": "3.1.2",
"date": "2026-03-11",
Expand Down
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