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docs(1.1): measured batch-group RAM delta (-350MB / ~70%)

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4 live batch workers = 509MB; consolidated startup floor = 118.5MB
(imports 102.5 + repo pool 15.7 once vs 4x + bus 0.3). Side-effect-free
measurement (no mutation tick). Floor is a lower bound; live adds modest
per-worker working set. Exact live number pending controlled unit swap.
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2026-06-17 16:57:21 -04:00
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@@ -170,9 +170,25 @@ B is incremental, reversible, and keeps the ops model you know — it de-risks t
pattern on one group before betting the fleet. C is the higher ceiling but rests on an
empirical CoW question we haven't answered yet. Build the primitive once; it serves both.
## Projected (revised)
## Measured — batch group (2026-06-17, side-effect-free floor measurement)
- C2–C3 (import floor): only the 2-3 DB-less workers shed the ORM. **~100 MB.** Cheap hygiene.
- **C4–C5 (consolidation): the main event.** Idle herd ~8 × 86 MB → 1 × 86 MB ≈ **−600 MB**.
- C6 (scapy merge): 3 × 76 MB → 1 × 76 MB ≈ **−150 MB**.
- Total: 2.57 GB → **~1.0 GB**. The bulk comes from consolidation, which costs isolation.
The 4 live batch workers vs the consolidated startup floor (imports + repo pool +
bus client, measured WITHOUT running a mutation tick to avoid racing the live fleet):
| | RSS |
|---|---:|
| enrich + reconcile + mutate + orchestrate (4 procs) | **509 MB** |
| consolidated startup floor (1 proc) | **118.5 MB** |
| of which DB pool | 15.7 MB (1× vs 4× → ~47 MB saved alone) |
**Delta ≈ −350 MB (~70%) on this group.** 118.5 MB is a lower bound: the live
consolidated process adds each worker's working set on top (idle workers, so modest —
estimate ~140–170 MB live). The exact live number needs the controlled unit swap.
## Projected (rest of release)
- Batch group (measured): **−350 MB**, confirmed by floor measurement, swap pending.
- C-cpu group (4 clusterers): similar shape, ~**−300 MB** expected.
- C-scapy (collect+probe): share the 76 MB scapy once, ~**−150 MB**.
- Total: 2.57 GB → **~1.3 GB** realistic (consolidation only; webhook/canary stay out).
Prefork (C) could push further but is gated on the 3.14 CoW measurement.