Robert Allan JamesandClaude Opus 5.5
6e933dac38
Observer flag on switch-signal slots, set by the kernel for the Tripod (is_fleet_foundation, hoisted; Hera in kernel_main). The decision: an observer in progress or holding an event keeps the CPU; observers with events (mail, Hera's console input) go ahead of participants, oldest wait stamp first; participants compared by work heat as before. Observers are never charged (O-2) nor floored. Uncommitted heat-share charge discarded. Evidence, byte-identical amd64/aarch64/riscv64: G interleave unchanged; Hestia's mail runs before any worker output (HHHABB...); a line typed while two workers run is read and executed mid-stream (...ABAB1 2 + . / 3 ok / ABAB...) -- console responsive under load. Relay 3, dict_hash unchanged. Busy-wait DOE deliberately not run (deadlocks by design until O-C). FABRIC-3.9.0 records rulings and Captain Bob's messaging note (§7). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
87 lines
6.7 KiB
Markdown
87 lines
6.7 KiB
Markdown
# FABRIC-3.9.8.md — Observers and participants: execution plan and log
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**Status: PLANNED. No stage started.** The design and its open rulings (O-1 to O-4, plus the
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discard question) are in `FABRIC-3.9.0.md`.
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Each stage:
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- needs Captain Bob's explicit go;
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- gets its own commit;
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- gets its own three-architecture acceptance (`clean qemu`; amd64, then aarch64, then riscv64;
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foreground; visible framebuffer; one at a time; coupled images reset before each).
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Evidence is named **before** each stage runs.
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**The standing acceptance sequence for every stage**, unchanged from `FABRIC-3.8.md`:
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- a boot to `[zuse@Hera] ok>` with zero `UNKNOWN WORD`, faults and frame corruption;
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- the `dict_hash` set identical across ISAs;
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- the Stage G interleave (two workers, `A`/`B`), byte-identical across ISAs;
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- mint → WIREBIND → `USE` → `1 2 + .` → `3`;
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- 0 bytes of idle log growth over 20 s.
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## 1. Staged plan
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| Stage | Change | Evidence (named in advance) |
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|---|---|---|
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| **O-A** | Observer role (`FABRIC-3.9.0.md` §2.1). The absolute-heat-share charge is discarded (ruling 5). Observers are left out of the decision's candidates, the work-heat charge and the floor, and (O-2) the absolute charge. Observers with events go ahead at clean boundaries, among themselves by wait stamp (§2.4, per O-1). | *(Corrected before starting.)* The standard sequence, with the G interleave unchanged. **Console responsive under load:** `1 2 + .` typed while `wa`/`wb` run prints `3` in the middle of the A/B stream. **Observer precedence:** a message to Hestia sent in the same line as the two worker jobs runs before any `A`/`B`. **Not run: the busy-wait DoE driver.** Under O-1, Hera running `DOE` is an observer acting on an event, and nothing displaces her, so `MU-WAIT-ALL` would wait forever. The originally named evidence ("Hera's share falls on the unchanged busy-wait driver") contradicts the design. `DOE` stays unrun until O-C replaces the driver. |
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| **O-B** | Hera's own mail drained at `sk_vm_idle_point()`, with the readline `n > 0` gate; the timer-paced pump drain removed (§2.5). | The standard sequence, plus: a message sent to Hera while she sits idle at the prompt is acted on **without waiting for the idle beat**. A probe records the delay in beats from admission to drain; it must be well under `SK_IDLE_BEAT_INTERVAL`. The relay and BLK-ATTACH flows are unchanged. |
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| **O-C** | An event-driven DoE driver (§3): `DOE` starts trial 1 and returns to the prompt; `MU-DONE` counts, ends trials and starts the next; `MU-WAIT-ALL` is deleted. Capsule only. | A 1-rep smoke campaign on amd64 runs all 6 cells to `MU-CAMPAIGN: complete`, with every trial `fail=0` and N/N `KILL … dead`. Hera's rows during trials are only event handling. The prompt answers typed input while trials run. Then the standard sequence on all three ISAs. |
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| **O-D** | The DoE relaunch: `12345 3 S" <isa>" DOE`, amd64, then aarch64, then riscv64, with the ring extracted between ISAs and `artemis.img` **not** reset in between. | A fresh time estimate from O-C's measured row rate, **before** launch. Then per ISA: 18 `MU-TRIAL` markers, `fail=0`, `MU-CAMPAIGN: complete`. |
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| **Merge** | This branch to `master`, once all three ISAs have completed O-D. | Per this project's own merge practice, at Captain Bob's word. |
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**Stop conditions** (re-plan rather than push on):
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- `dict_hash` diverges across ISAs;
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- conservation (`vm_physics_conserved()`, `stadium_conserved()`) goes false;
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- an observer is ever returned as a heat candidate;
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- a switch storm: log growth at an idle prompt, with QEMU pinned;
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- a trial that never produces its marker.
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## 2. Execution log
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- [x] **Stage O-A — the observer role (`FABRIC-3.9.0.md` §2).** 2026-09-24. Captain Bob: *"all as
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proposed, go ahead with O-A"* (O-1 to O-4 and the discard, all as proposed).
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- **Discarded:** the uncommitted absolute-heat-share charge (`git checkout` of
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`capsule_vm_physics.c/.h`), per ruling 5.
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- **`capsule_vm_switch_signal.c/.h`:**
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- Each slot carries an `observer` flag, with `sk_vm_switch_signal_set_observer()` and
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`is_observer()`.
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- `sk_vm_switch_decide()` now works in tiers:
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1. An observer that is itself in progress (a live non-IDLE frame) or holding an event
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keeps the CPU.
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2. Otherwise, an observer with an event, meaning mail (or console input, for Hera),
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goes ahead of every participant. Among observers, the oldest wait stamp wins.
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3. Otherwise, participants are compared by work heat exactly as in FABRIC-3.8.
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Observers are never heat candidates.
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- `note_work_gained()` never floors an observer and leaves observers out of the floor
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set. The running VM counts only if it is a participant.
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- **`capsule_birth.c`:** `is_fleet_foundation` is hoisted to function scope. Registration
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marks the Tripod as observers from that same birth-time fact.
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- **`kernel_main.c`:** Hera is marked an observer where she registers.
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- **`vm_runtime.c`:** observers are not charged at all (O-2).
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- Nothing a VM executes can set or clear the role.
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**Evidence, as corrected before starting (§1).** Ordinary words only, typed at
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`[zuse@Hera] ok>`, byte-identical on all three ISAs (`logs/20260924-084904/amd64/`,
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`-090107/aarch64/`, `-091424/riscv64/`):
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- **G interleave unchanged:** A = 40, B = 40, 48 runs.
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- **Observer precedence:** `S" LA" S" wa" SEND . S" LB" S" wb" SEND . S" 72 EMIT 72 EMIT
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72 EMIT" S" Hestia" SEND .` gives `HHHABBAABBAA…`. Hestia's mail ran before any
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participant output once Hera went idle.
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- **Console responsive under load:** with `wa`/`wb` on 200 markers × 20,000-iteration
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loops, `1 2 + .` typed mid-run appears as `…ABABAB1 2 + .` / `3 ok` / `ok> ABABBA…`.
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Hera, an observer with console input, got the CPU at the next worker boundary, ran the
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line, and the workers resumed. This is the C-4 (α) starvation recorded at C-b, fixed.
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*(The first amd64 attempt at this check used loops that finished before the line was
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typed, so it proved nothing. It was re-run with the heavy loops, and the script was fixed
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for the other two ISAs.)*
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**Acceptance** (same boots):
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- All reach `[zuse@Hera] ok>` with zero `UNKNOWN WORD`, faults and frame corruption.
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- The `dict_hash` set is unchanged from Stage I (word_count 531, M7.1a
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`0x572daac83b797332`), since no words were added or removed.
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- Mint → WIREBIND → `USE` → `1 2 + .` → `3`.
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- Idle log growth: 0 bytes.
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- Clean build on all three plus hosted, no new warnings.
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**Not run, by design:** the busy-wait DoE driver, which would deadlock under O-1 (§1).
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Don't run `DOE` until O-C.
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