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Encode generation payloads once on success

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Eric Rakestraw
2026-10-09 00:27:24 +00:00
parent c63ca5352f
commit 78bff91395
4 changed files with 47 additions and 9 deletions
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docs/roadmap/implementation.md
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@@ -2,7 +2,7 @@
Implement the remaining local work in the [performance roadmap](performance.md)
in order. Each sequential stage is scoped for one Luna coding-agent prompt.
Stages 1–5 are complete; Stages 6–14 remain pending. Update status and evidence
Stages 1–6 are complete; Stages 7–14 remain pending. Update status and evidence
as each work unit lands.
The completed inspection plan is preserved at
`481e2d4:docs/roadmap/implementation.md` in Git history.
@@ -252,6 +252,11 @@ tests, [integration contract](../integrations/openai-compatible-chat.md), and
## Stage 6 — Encode Valid Extra Parameters Only In The Complete Request
**Status: Complete (2026-10-09).** Successful request preparation now encodes
the assembled payload once. Extra-parameter classification remains covered on
the failure path, including precedence when the schema also cannot be encoded.
The Stage 5 benchmark comparison is recorded below.
**Outcome:** Successful request preparation does not serialize extras twice.
**Work:**
@@ -786,6 +791,34 @@ these measurements are the comparison reference for the following request
encoding change, not a provider-latency estimate. Focused verification passed:
`go test -mod=readonly ./internal/llm`.
### Request-Preparation Copy Comparison
The before results above use the Stage 5 benchmark fixture committed at
`3f15715`; the after results below use the unchanged fixture after the client
change in the working tree based on `c63ca53`. Both measurements use the same
offline environment and command recorded in the baseline subsection. `ns/op`
values list all five samples, followed by median and range. Allocation figures
are `B/op; allocs/op`.
| Preparation case | Before `ns/op` (median; range) | Before allocations | After `ns/op` (median; range) | After allocations |
| --- | --- | --- | --- | --- |
| No extras | 2771, 2873, 2872, 2907, 2885 (2873; 2771–2907) | 1632; 23 | 2849, 2841, 2872, 2746, 2902 (2849; 2746–2902) | 1632; 23 |
| Small extras | 4216, 4255, 4440, 4090, 4245 (4245; 4090–4440) | 1928; 32 | 3772, 3865, 3888, 3804, 3931 (3865; 3772–3931) | 1904; 29 |
| 1 MiB string extra | 3108655, 3046197, 3165484, 3115831, 3074278 (3108655; 3046197–3165484) | 2147898–2213942; 26–27 | 1524191, 1516315, 1537340, 1565157, 1538894 (1537340; 1516315–1565157) | 1140425–1197988; 25 |
| Nested JSON extras | 5933, 5803, 5675, 5490, 5611 (5675; 5490–5933) | 2304; 40 | 4440, 4446, 4389, 4302, 4481 (4440; 4302–4481) | 2016; 32 |
| Structured output | 6421, 6018, 6479, 6153, 6712 (6421; 6018–6712) | 2632–2633; 47 | 6253, 6137, 6267, 6315, 6232 (6253; 6137–6315) | 2632–2633; 47 |
The 1 MiB extra reduced median preparation time by about half and cumulative
allocation by approximately 1 MB. Small and nested extras also used fewer
bytes and allocations; no-extras and structured-output allocations were
unchanged. Timing ranges are machine-local evidence, not a consumer guarantee.
Invalid nested extras retain `ErrInvalidRequest` and key context before
transport. With an unencodable schema, serializable extras retain
`ErrRequestFailed`; invalid extras retain `ErrInvalidRequest`. Prepared retry
attempts continue to use the frozen body. Verification passed:
`go test -mod=readonly ./internal/llm ./internal/generation`, and the benchmark
family above was rerun without the race detector.
## Open Questions
No consumer-policy decisions remain open. File reservation and encoding error