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perf: cheap per-frame and per-fetch savings (#725)

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Six small savings with no behaviour change: the odds fetch no longer pretty-prints every response for a debug line; the scroll integer-slice path drops a redundant full-frame np.ascontiguousarray; ledmatrix-web.service gets MALLOC_ARENA_MAX=2 like the display unit; core ESPN responses are parsed via response_json (orjson when installed); and the scroll frame stats go to INFO only for degraded windows plus a 5-minute heartbeat.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-10-03 14:26:03 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 7bb85c0356
commit ed0753c1ca
12 changed files with 261 additions and 32 deletions
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test/test_systemd_malloc_arenas.py
+9 -5
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@@ -30,6 +30,8 @@ from pathlib import Path
import pytest
UNIT = (Path(__file__).resolve().parent.parent / "systemd" / "ledmatrix.service")
#: The web interface is a threaded process too, so it carries the same cap.
WEB_UNIT = UNIT.parent / "ledmatrix-web.service"
#: The value the unit is expected to carry. 2 is the usual choice for a
#: threaded Python process; 1-4 all keep some of the saving, but only one of
@@ -49,8 +51,9 @@ def test_the_unit_exists():
assert UNIT.is_file(), f"{UNIT} is missing"
def test_malloc_arena_max_is_capped():
env = _environment(UNIT.read_text(encoding="utf-8"))
@pytest.mark.parametrize("unit", [UNIT, WEB_UNIT], ids=lambda p: p.name)
def test_malloc_arena_max_is_capped(unit):
env = _environment(unit.read_text(encoding="utf-8"))
assert "MALLOC_ARENA_MAX" in env, (
"the display unit does not cap glibc arenas; on a 3-core Pi the default "
"ceiling is 24 and a measured rig held 23 of them, 920 MB"
@@ -69,9 +72,10 @@ def test_malloc_arena_max_is_capped():
)
def test_the_reason_is_recorded_next_to_it():
@pytest.mark.parametrize("unit", [UNIT, WEB_UNIT], ids=lambda p: p.name)
def test_the_reason_is_recorded_next_to_it(unit):
"""A bare tuning knob invites removal by whoever meets it next."""
text = UNIT.read_text(encoding="utf-8")
text = unit.read_text(encoding="utf-8")
index = text.index("Environment=MALLOC_ARENA_MAX")
preamble = text[:index].splitlines()[-12:]
comment = "\n".join(line for line in preamble if line.startswith("#"))
@@ -82,7 +86,7 @@ def test_the_reason_is_recorded_next_to_it():
)
@pytest.mark.parametrize("unit", ["ledmatrix.service"])
@pytest.mark.parametrize("unit", ["ledmatrix.service", "ledmatrix-web.service"])
def test_the_unit_still_parses_as_ini(unit):
"""systemd will refuse a malformed unit, and the panel stays dark."""
import configparser