- test_exchange_window and test_raw_exchange_gpu fine(): dense root becomes
a (12, 8) blocked root (fine(None) stays only for the dense reference test
that D2 retires);
- jets: G1/G3 compare blocked layouts against the FINE_BLOCKS[0] reference
(blocked root); the dense run is a separate leg D2 removes; G2 legacy
actuation vs Jet on the blocked reference; CPU fixtures use a blocked root;
- test_refinement_blocked_fine.raw reads every level through its layout;
- test_fine_surface_gpu: new test_fine_surface_blocked_matches_uniform_four_hops
(fine ROI after each of four hops vs the uniform 48^2 solver with the same
tolerances, blowing/suction mass sign from raw exchange, zero actuation ==
passive bit for bit); the cross-interface donor rejection passes tiles.
The dense hook/ledger/audit probes in test_fine_surface_four_hops and the
dense SoA fault tests stay until D2 retires them by name.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
test_exchange_window, test_raw_exchange_gpu (one fine(block) helper for
the repeated circle+jet construction), test_refinement_jets,
test_multiple_pinned_remap_gpu and test_pinned_body_remap_gpu pass
refinements/level_* lists. Dense fine levels stay level_blocks=[None,
None|block] as before. Assertions unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Separate GPU class for a shifted MRT, all-blocked, stationary-body case
without Jets: window totals vs summed per-base reads (substep-scaled
tolerance), bitwise populations vs a raw-only stepper, a single step(N)
stepper with bitwise-equal window rows and populations, step(0)
non-change, and reset after a window. SRT/Jet test stays separately
scoped. Test-only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Scale the window-vs-summed-reads tolerance by the actual absolute fine
substep contributions (last_raw after every fine hop), labelled a
conservative engineering tolerance rather than a proof. Compare
populations by finite FP32 bits plus NaN masks and reject infinities.
Test-only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
FixedPatchStepper(observe_window_exchange=True), which requires
observe_raw_exchange, allocates a second per-link FP64 ledger per body
level. While a window is open, the unchanged BlockAccumulateExchange
kernel also accumulates into it after each fine hop. Small API:
start_exchange_window() zeroes and opens at the current completed step;
read_exchange_window(body_id, level=) is non-destructive and reports
impulse with rates over the integer window duration. initialize/
_initialize_raw and step failure invalidate; remap builds a new instance
with no open window; Jet amplitude updates may stay in-window. Default
disabled: no allocation and no extra launch; last_substep/last_base_step
unchanged. summarize_exchange gains window='window' with duration.
Host contract tests (mocked driver) and a GPU gate against summed
per-base reads with a reordering-bound FP64 tolerance.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Frank14f