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#45 ROOT CAUSE + FIX: the gauge executive starves in MP -- panels froze at healthy fps

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Instruments repaint via the background task pump, which authentically runs
ONLY in the frame's leftover time with a floor of ONE pump per frame; the
gauge renderer is 1 of ~7 round-robin tasks and each turn advances ONE gauge
of ~140 active, with the rate mask advancing once per full sweep.  On a busy
MP mission the foreground eats the whole frame budget, the floor becomes the
norm, and the whole instrument stack rotates once in MINUTES at perfect fps:
comms-panel K/D stuck at 0, recharge tickers frozen, while the tallies and
their replication underneath were exactly right.  Measured: 4-node bench at
70-90 fps gave the PilotList ~2 Execute turns in six minutes.

Fix, both env-tunable, authentic behavior restorable:
  BT_BG_MIN      (APPMGR.cpp, default 32, 0=authentic)  minimum background
                 pumps per frame regardless of slack;
  BT_GAUGE_BATCH (GAUGREND.cpp, default 32, 1=authentic) gauges advanced per
                 gauge-renderer turn (a visit is only a rate-mask check
                 unless the gauge is due).
Verified 4-node self-damage bench: sweeps 0.006/s -> 18-20/s, PilotList ~10
Exec/s, ALL FOUR panels tracked every death live (0->11) within ~1s, bg cost
2-4 ms/frame, respawn ledger clean (40 cycles, 0 swallow / 0 mismatch).

Also: BT_PERF now reports gaugeTurns/sweeps/active alongside bgTasks;
BT_AF_PERIOD now throttles the missile autofire group too (unthrottled spam
trips the documented FailureHeat all-weapons brick, which froze run 1 of the
cross-fire bench).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Joe DiPrima
2026-07-30 11:22:47 -05:00
co-authored by Claude Fable 5
parent bfa1b04990
commit 494f32efb4
5 changed files with 106 additions and 3 deletions
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game/reconstructed/mech4.cpp
+5 -1
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@@ -5584,7 +5584,11 @@ void
// exercise MISSILES ONLY -- isolates missile damage/splash from laser+PPC
// fire (task #62 TTK verification).
static const int s_afMissile = getenv("BT_AF_MISSILE") ? 1 : 0;
const int autofireMsl = (s_afMissile && targetInArc) ? s_afPhase : 0;
// afGate: BT_AF_PERIOD must throttle the missile group too -- unthrottled
// missile spam trips the documented FailureHeat permanent brick (open-
// questions "Missile launcher trips FailureHeat"), which froze every
// weapon + recharge gauge in the first 4-node cross-fire bench.
const int autofireMsl = (s_afMissile && targetInArc && afGate) ? s_afPhase : 0;
int want[4];
want[0] = ((gBTLaserKey && targetInArc) || autofire) ? 1 : 0;
want[1] = (gBTPinkyKey && targetInArc) ? 1 : 0; // key '4' (was unmapped)