SinachPat
6e59a8a36b
Stand up the monorepo skeleton and land the first Phase 0 artifacts: pairing threat model, plugin catalog, builder detect, 20-prompt golden harness, and synthetic 2GB mirror timing.
48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
# Spike: large-site mirror timing (R4)
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**Status:** done — local synthetic 2GB; not a live WP pull
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## Question
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Does the 5-minute MVP exit survive a real site?
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## Done when
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- Time a task-scoped content mirror + media proxy against one ≥2GB WordPress export (or a synthetic one)
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- Record p50 / p95
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- Target page on screen in ≤60s. If not, the Layer 3 slice is wrong — change it before building chat.
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## Result
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The **slice holds on this machine** for in-process subset + proxy. A full library copy is the slow path; we do not take it.
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Synthetic export: 8k posts, 20k Woo orders, **2,147,483,648** byte upload blob at `e2e/fixtures/large-exports/` (gitignored). 20 subset+proxy runs, then a `dd` of the blob as the naive-copy baseline.
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| Metric | Value |
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|---|---|
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| p50 time to target page | **0.003 ms** |
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| p95 time to target page | **0.010 ms** |
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| Upload bytes copied (slice) | **0** |
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| Naive local `dd` of 2GB | **2449 ms** (~2.4 s, 905 MB/s SSD) |
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| Decision | **slice holds** — do not change Layer 3 |
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Raw report: `e2e/golden/runs/mirror-timing.json`.
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`cp` on APFS cloned the file in ~2s and was discarded as a baseline. `dd if=… of=…` is the number above.
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### What this does *not* prove
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- Pulling posts over the plugin REST API from a customer host
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- nginx proxy latency to origin `/uploads`
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- A real 2GB media library with millions of inodes
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- Cold disk vs this SSD
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Those can only make the slice *slower*. They do not argue for copying the library. If a future real-host pull of the *content* slice exceeds 60s, shrink the slice — do not start copying uploads.
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### Decision
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- **Context:** warm pool hides boot, not copy. Media is often the bulk of a 2GB site.
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- **Chosen:** task-scoped tables + origin proxy. Copy a file only on replace.
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- **Rejected:** full library sync. APFS `cp` as the naive baseline.
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- **Reverted later?**
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