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perf: import heavy optional dependencies on first use (#1377)

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A GENETIC server with external (import) providers and EOSdash disabled
loads several large packages at start that it never uses, which costs
a noticeable part of the memory on 512 MB boards:

- matplotlib via the GENETIC/GENETIC0 PDF report modules (server/eos.py)
- statsmodels via the Holt-Winters fallback in prediction/priceabc.py
- pvlib via the weather base class and the pvlib-based providers
- bs4/lxml via the ClearOutside provider
- scipy via the self-consumption interpolator singletons, which were
  loaded at import time
- the GENETIC0 optimizer, imported by core/ems.py
- tzfpy, whose polygon data the computed general.timezone loads

Import these where they are used. The interpolator tables are loaded
on first use (thread-safe). Nothing changes in what is computed.

general.timezone is computed from latitude/longitude and cannot be set.
Add general.timezone_override (IANA name, validated with pendulum):
when set, general.timezone returns it and the lookup is skipped. When
unset (default) the lookup is unchanged.

Tests that patched the moved names now patch them at their source.
A new test starts the server module in a subprocess and checks that
none of these modules is loaded.

Co-authored-by: Christin <christin@BigBrother.bikini.bottom.zone>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Christin
2026-10-11 08:40:43 +02:00
committed by GitHub
co-authored by Christin Claude Opus 5.5
parent 6d26252c6a
commit 3651d33915
21 changed files with 295 additions and 47 deletions
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CHANGELOG.md
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@@ -38,6 +38,8 @@ compatibility changes and a short test procedure. These changes are not yet a ta
and coverage information. A capacity estimate does not overwrite configured capacity.
- Optional local, calibratable forecasting within `PVForecastAkkudoktor`; the remote
backend remains the default.
- Optional `general.timezone_override`: an IANA timezone name used as `general.timezone`
instead of the lookup from latitude/longitude. Unset (default), the lookup is unchanged.
- New PV forecast providers giving operators more cloud forecast sources to choose from in
addition to Akkudoktor, VRM and Import:
- `PVForecastPVNode` — native 15-minute forecasts from the pvnode.com API.
@@ -60,6 +62,9 @@ compatibility changes and a short test procedure. These changes are not yet a ta
values. Runtime forecast energy is Wh per slot and prices are currency per Wh.
- Runtime configuration changes now take priority over environment and file values for
explicitly updated keys; command-line settings retain higher priority.
- Lower idle memory: matplotlib (PDF reports), statsmodels (price fallback forecast), pvlib,
bs4/lxml, scipy (self-consumption table), the GENETIC0 optimizer and the timezone lookup
data are imported on first use instead of at server start. Results are unchanged.
### Fixed