Say which half of the shape evidence is measured - #343
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Two corrections to the runner-shape section, one of them mine to own. The four-vCPU measurements never reached the guide. The edit that was meant to add them silently matched nothing, because it was written against wording an earlier commit in the same branch had already replaced, and a documentation gate passes just as happily on a file that did not change. So #342's commit message and its review replies both described a table the guide does not contain. It contains it now: the four-vCPU column, the wall times, and the point that peak memory belongs to the shape rather than to the workload, since cargo scales parallelism with the processor count and the same job peaked at 7,907 MiB on eight vCPUs and 3,889 MiB on four. Second, say plainly which half of the acceptance evidence is measured. The warm limb is: 16m47s on four vCPUs against a 25-minute bar. The cold limb is not. The shape change altered no sccache key, so the run intended as the cold writer found the store already populated and returned a 100 % hit rate. Every four-vCPU peak observed lies between 3,889 and 4,637 MiB, and reduced parallelism should keep a cold run below its eight-vCPU counterpart of 8,812 MiB, so 12 GB looks safe by a wide margin. That is inference, and the guide now labels it as such rather than letting a later reader mistake it for a measurement. The next dependency bump will settle it. Also record why the cargo watchdog had to rise before the shape could shrink, and that free disk fell from 99 to 52 GiB, since that is the only measure that moved materially.
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Reviewer's GuideUpdates the developer guide with shape-specific runner measurements and explicitly separates measured four-vCPU warm evidence from the inferred cold-run safety case, while documenting the timeout and disk considerations behind the runner change. File-Level Changes
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Summary
WalkthroughUpdate the developer guide with resource measurements for eight- and four-vCPU runners. Document memory sizing, inferred results, Cargo timeout, and disk-space constraints. ChangesRunner resource guidance
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Merge Risk: 🔵 Low · up to The runner-sizing guidance adds useful measurements, but its resource table needs a descriptive caption to meet documentation conventions and remain clearly identifiable. 🚥 Pre-merge checks | ✅ 15✅ Passed checks (15 passed)
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In `@docs/developers-guide.md`:
- Around line 484-489: Add a descriptive caption immediately before the resource
measurements table, identifying that it compares runner resource measurements by
runner shape. Leave the table data unchanged.
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Adding the four-vCPU column made a claim inherited from the eight-vCPU text wrong. "Memory is the binding constraint, not disk" was true of the sizing decision it was written for and is not true of the shape now in use, where memory peaks at 3,889 to 4,637 MiB against a 12 GB bound while the cargo watchdog is what actually binds. The guide said both things a few paragraphs apart. It now states the constraint per shape and says which decision each figure belongs to. Stop promising that the next dependency bump settles the cold-memory question. A bump invalidates only the objects it touches and eviction removes only what it happens to reach, so either can produce another partly warm build whose peak says nothing about a cold one. What settles it is a run reporting a zero or near-zero hit rate, however that arrives. Naming the evidence rather than the occasion is the difference between a condition someone can check and one that quietly never arrives. Caption the table, per the documentation style guide.
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Summary
Documentation only. Corrects the runner-shape section of the developer's guide
on two points, one of which is a mistake of mine in #342.
The four-vCPU measurements never reached the guide
#342's commit message and its review replies both describe a guide table
carrying the four-vCPU column and the point that peak memory depends on the
shape. The guide does not contain either. The edit was written against wording
that an earlier commit on the same branch had already replaced, so it matched
nothing and wrote nothing, and
make markdownlintpassed exactly as it wouldon any unchanged file.
Nothing shipped wrong: the workflows, the timeouts and the cargo cap all landed
correctly, and the measurements are recorded in the pull request and in the
rollout plan. What was missing is the durable copy, in the place a future
contributor would look before questioning the runner shape.
The section now carries:
with the rule those numbers support: peak memory is a property of the shape,
not only of the workload, because cargo scales parallelism with the processor
count. A peak measured on one shape cannot be carried to another.
Which half of the acceptance evidence is measured
The warm limb is measured: 16m47s on four vCPUs against a 25-minute bar.
The cold limb is not, and the guide now says so instead of leaving a reader to
assume otherwise. The shape change altered no sccache key, so the run intended
as the four-vCPU cold writer found the store already populated and came back at
a 100 % hit rate. Every four-vCPU peak observed lies between 3,889 and
4,637 MiB, and reduced parallelism should keep a cold run below its eight-vCPU
counterpart of 8,812 MiB, so the 12 GB bound looks safe by a wide margin.
That is inference, not measurement, and it is labelled as such. The next
dependency bump or cache eviction will produce a real cold run and settle it.
Also recorded
Why
RUN_RUST_CARGO_WAIT_TIMEOUThad to rise from 1,800 s before the shapecould shrink, since the eight-vCPU cold writer already ran 1,757 s and the cap
applies to one cargo command rather than to the job; and that free disk fell
from 99 GiB to 52 GiB, the only measure that moved materially.
Validation
Documentation only, so the Markdown gates are the relevant ones.
make markdownlintmake nixieNo code, workflow or test file is touched.
Summary by Sourcery
Clarify the runner-shape evidence by documenting measurements for both shapes and explicitly separating measured results from inferences about four-vCPU cold runs.
Enhancements:
Documentation: