bherbruckandClaude Opus 5.5
f9b7604ed1
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL
37 lines
2.1 KiB
Markdown
37 lines
2.1 KiB
Markdown
# Performance
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## Large sketches
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Measured with `cargo test -p solvecraft-engine --release sketch_perf -- --ignored --nocapture`
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(`crates/engine/src/cmd/sketch_perf_tests.rs`). The sketch holds `n` rectangles (four lines,
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horizontal/vertical constraints and two length dimensions each) and `n` circles. All times are
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wall-clock milliseconds on the development machine while other builds were running (load
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average around 60), so treat them as upper bounds.
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| n | curves | points | constraints | solve | profiles | draw lists | snap query | add a line (command) | drag a point (command) |
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|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|
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| 250 | 1 250 | 1 251 | 1 500 | 15 | 30 | 12 | 0.1 | 68 | 48 |
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| 500 | 2 500 | 2 501 | 3 000 | 35 | 47 | 10 | 0.1 | 123 | 100 |
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| 1000 | 5 000 | 5 001 | 6 000 | 65 | 134 | 1 | 0.3 | 232 | 100 |
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"Add a line" and "drag a point" are whole commands: they copy the sketch, solve it, store it and
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re-evaluate the timeline (a second solve, plus profile finding). "Draw lists" is
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`view::sketch_lines`, the polylines the viewport draws.
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Before the 2026-10-08 changes the n = 1000 sketch took 1 280 ms to solve, 590 ms to find
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profiles and 5.1 s per command:
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- The solver built one dense Jacobian over every variable of the sketch, for each connected
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component's iterations and again for the degree-of-freedom analysis (5 000 × 10 000 entries,
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then reduced row echelon form). It now builds each component's Jacobian over that component's
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own variables. The sketch's Jacobian is block diagonal, so its rank is the sum of the
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components' ranks, and components were already solved separately.
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- Grouping variables into components searched a list per variable. It now uses a map.
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- Profile finding looked at every curve end for each crossing it found, and sorted profiles with
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a linear id lookup in the comparison. It now uses the grid it already builds for crossings,
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and sorts on precomputed keys.
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Projection (linked reference geometry) is cached per model state, so edits to a sketch with
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projected silhouettes or sections on a ~20 000-triangle model cost about 3 ms each instead of
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about 80 ms.
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