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feat(vegas): prefetch_gate on by default, after an A/B/C soak on hdpi

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Two runs per arm, about 81,000 frames each, order A B C C B A:

  A  step 1 as is            0.90% late, 20.1 per 10k two+ refreshes late
  B  switch_interval_ms 1    0.78% late, 15.8 per 10k
  C  prefetch_gate           0.60% late,  2.5 per 10k

No freezes in any arm, and the next group was ready at every strip
extension, so parking the prefetch thread (3-6s per 8-minute run) cost
nothing visible. The gate is now on unless vegas_scroll.prefetch_gate is
false; on a stock binding it cannot work and says so at INFO once a run
rather than warning on every install. switch_interval_ms stays off.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-09-24 16:07:26 -04:00
co-authored by Claude Opus 5.5
parent de54fc879a
commit 1afb2383cd
5 changed files with 54 additions and 21 deletions
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test/test_render_gate.py
+12 -6
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@@ -311,10 +311,16 @@ class TestVegasWiring:
c.display_manager = type("DM", (), {"render_gate": None})()
return c
def test_off_by_default(self, monkeypatch):
def test_on_by_default(self, monkeypatch):
monkeypatch.setattr(render_gate, "swap_releases_gil", lambda: True)
c = self._coordinator()
c._install_render_gate()
assert isinstance(c.display_manager.render_gate, RenderGate)
def test_can_be_turned_off(self, monkeypatch):
monkeypatch.setattr(render_gate, "swap_releases_gil", lambda: True)
c = self._coordinator(prefetch_gate=False)
c._install_render_gate()
assert c.display_manager.render_gate is None
def test_installed_for_the_run_and_removed_after(self, monkeypatch):
@@ -338,12 +344,12 @@ class TestVegasWiring:
def test_read_from_config(self):
from src.vegas_mode.config import VegasModeConfig
on = VegasModeConfig.from_config(
{"display": {"vegas_scroll": {"prefetch_gate": True}}})
assert on.prefetch_gate is True
assert on.to_dict()["prefetch_gate"] is True
off = VegasModeConfig.from_config(
{"display": {"vegas_scroll": {"prefetch_gate": False}}})
assert off.prefetch_gate is False
assert off.to_dict()["prefetch_gate"] is False
assert VegasModeConfig.from_config(
{"display": {"vegas_scroll": {}}}).prefetch_gate is False
{"display": {"vegas_scroll": {}}}).prefetch_gate is True
def test_the_prefetch_runs_inside_the_gate(self):
from src.vegas_mode.render_pipeline import RenderPipeline