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fix(client): median-of-5 timing in fog perf test — kills load flake (T-1092)

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test_visibility_texture_update_performance asserted a single wall-clock
sample against the 0.5ms budget and blocked two pushes while a live session
shared the machine (0.704ms / 0.623ms; 46/46 green in isolation). Median of
5 runs preserves the D-059 budget intent while absorbing load spikes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-07-06 20:18:01 +02:00
co-authored by Claude Fable 5
parent 6372537f2f
commit 72f88dae1d
3 changed files with 14 additions and 6 deletions
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client/tests/test_fog_shader.gd
+12 -6
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@@ -192,15 +192,21 @@ func test_visibility_texture_update_performance() -> void:
# a rare amortized event (8-tile padding), not part of the per-frame budget.
fog_state.update_from_state()
# Measure the steady-state per-frame update (same positions, no resize)
var start := Time.get_ticks_usec()
fog_state.update_from_state()
var elapsed_us := Time.get_ticks_usec() - start
var elapsed_ms := elapsed_us / 1000.0
# Measure the steady-state per-frame update (same positions, no resize).
# Median of 5 runs: a single wall-clock sample flakes when the machine is
# loaded (T-1092 — the pre-push gate shares the box with live sessions);
# the median keeps the D-059 budget intent while absorbing load spikes.
var samples: Array[float] = []
for _i in range(5):
var start := Time.get_ticks_usec()
fog_state.update_from_state()
samples.append((Time.get_ticks_usec() - start) / 1000.0)
samples.sort()
var median_ms: float = samples[2]
# D-059: Visibility texture upload budget: 0.1ms
# Allow margin for test environment overhead
assert_that(elapsed_ms).is_less(0.5)
assert_that(median_ms).is_less(0.5)
GameState.visible_positions.clear()