Re-derive 3-element fixtures for [10, 100, 1000] preserving geometric
decay invariant. Rename excess_at_h6000_lifts_lambda_proportionally to
excess_at_h1000_lifts_lambda_proportionally.
Critical correction during execution: the kernel uses SQRT-anchored
TARGET_K_RATIO (since commit b5bed9f80 "sqrt K-ratio") not linear ratio.
The lifted-fixture computation mirrors the kernel's sqrt constant
(TARGET_K_RATIO_H2 = sqrt(10/1000) ≈ 0.3162) so the test fires the
lambda = 10 × base invariant under the actual kernel math.
Side-discovery (flagged for Task 5 scope expansion):
- cuda/smoothness_lambda_controller.cu:30 still has SLC_N_HORIZONS = 5
- TARGET_K_RATIO at lines 45-51 uses old-horizon formula {30/30, 30/100,
30/300, 30/1000, 30/6000}. With N_HORIZONS=3 the kernel reads only
slots [0..3] = {1.0, 0.5477, 0.3162} — those correspond to old
30/30, 30/100, 30/300 ratios. h1000's smoothness target is currently
anchored to OLD h300 ratio (functional bug requiring kernel update).
cargo test --test smoothness_lambda_controller_invariants: 4 passed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Atomic refactor wiring the GPU log ring's first producer end-to-end:
- cuda/gpu_log_helpers.cuh (new): extract LogHeader/LogRecord/LogRing
struct definitions + the log_record() device __forceinline__ helper
into a shared header. Single source of truth — other kernels include
this rather than redefining the structs.
- cuda/gpu_log_ring.cu: refactor to include gpu_log_helpers.cuh; retain
only the gpu_log_tick kernel.
- cuda/smoothness_lambda_controller.cu: include gpu_log_helpers.cuh, add
trailing (LogRing*, const int*) args, capture pre-EMA jitter +
post-EMA jitter + target + excess_ratio into shared mem, and emit
three records per call (RT_INPUT, RT_STATE, RT_OUTPUT) gated on
non-null ring pointer.
- trainer/perception.rs: feature-gated (cuda-diag-log) ring allocation +
step counter (mapped-pinned host shadow), gpu_log_tick launch FIRST
inside the captured graph, two new pointer args on the smoothness
controller launch (null when feature off), step-counter DtoD shadow
alongside the other telemetry shadows, drain task spawn (skipped when
no tokio runtime — sync tests still construct the trainer), and a
feature-gated Drop impl that aborts the drain task on shutdown.
- tests/smoothness_lambda_controller_invariants.rs: pass null pointers
for the two new kernel args; the kernel's nullptr guard preserves
pre-existing behaviour.
- build.rs: rerun-if-changed on cuda/gpu_log_ids.h and
cuda/gpu_log_helpers.cuh so header edits trigger cubin rebuilds.
Verified: cargo build / check --all-targets clean both with and without
the cuda-diag-log feature; 4/4 smoothness controller invariant tests
pass; 9/9 perception_overfit integration tests pass under the feature.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
