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Mateusz Sych e33c371e99 Model cache: thin the checkpoints of a design too big for its file instead of leaving the cache out (#3220) (#4882)
* claim: #3220

* Model cache: keep fewer states of a design too big for its file instead of none (#3220)

A model cache over the container's budget keeps the final state, then the
slowest features' states while the bodies they add fit (a body several
states hold counts once), and is left out only when not even the final
state fits. Opening evaluates just the features whose state the file left
out, each from the state before it, so the model is whole afterwards.

* Model cache: keep each encoded body apart, copy only what a cache stores

Encoding a model too big for its file no longer copies every distinct body
into one buffer before thinning: the payload is copied from the encodings
once its size fits, so saving holds no more than before.

* Model cache tests: canonical runs in the timeline fixture; rustfmt

* Model cache: count the records a thinned cache keeps; always try the final state

Thinning counted only the bodies, so a model of many copies of one part
(records, not bodies, filling the room) shrank its budget to nothing and
saved no cache although its final state fitted. The choice now counts the
records of what it keeps, always keeps the final state, and says what it
counted, so each retry keeps less and the final state alone is always tried.

* docs: a thinned model cache counts its records and always tries the final state

* Model cache test: the slowest feature's state holds bodies 16 to 23

* Model cache: thinned opens with fingerprints that read the state before a feature

Since #3397 a feature's fingerprint reads where the bodies before it lie.
After a state the file left out, adopt takes the saved fingerprint and the
evaluation that works the state out checks it. A result evaluated ahead
is never taken as one the file left out. The thinned round trips include
the placed components' design, whose cut reads those placements.

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Co-authored-by: MateuszSychXpl <151755914+MateuszSychXpl@users.noreply.github.com>
2026-10-23 13:44:11 +00:00
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2026-10-22 13:53:36 +00:00