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Fix N-RUNS/START-REP hardcoded constants; N-REPS increase blocked on reservoir cost, not a bug (FABRIC-3.md §XXIII)
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Two real bugs found and fixed while attempting to raise N-REPS from
3 (both harmless only by coincidence at N-REPS=3, since 3 happened
to equal the hardcoded/literal values):

- N-RUNS was `27 CONSTANT`, not derived -- now `N-ID N-REPS *
  CONSTANT N-RUNS`.
- START-REP's run_id decode used a literal `3 *` where it meant
  `N-REPS *` (confirmed against EXEC-STD79-DOE, the serialized
  baseline, which correctly uses N-REPS for the same decode).

Re-verified at N-REPS=3 (amd64): byte-identical to the already-
verified baseline -- 193s, 0 faults, 99/99 tokens every identity,
K conserved on all 656 rows.

Raising N-REPS to 6 was then tested and found to cause real, silent
data loss at full 8-identity scale (rajames 0/198, 00 66/198, 01/02
99/198, 03-06 fully complete) -- same failure class as §XXI defect 2,
just past the budget again since doubling N-REPS roughly doubles
total MSG-SEND volume (24->48).

Measured the reservoir's replenishment directly rather than assume
from source: 40 sends drained it from 21735 to 1; 300s of pure idle
time (zero further sends) brought it back to 2049 -- real, but only
~6.8 units/s, meaning a full refill would take on the order of 53
minutes against a campaign's few-hundred-second runtime. Raising
N-REPS further needs a cheaper per-send cost or an explicit top-up,
not reliance on ambient decay.

Reverted N-REPS to 3 (fixes kept, they're correctness fixes
independent of the value) rather than commit a silently-lossy result.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EXieurDfDSsDFdnSyusuWo
This commit is contained in:
Robert Allan James
2026-09-12 20:03:21 -04:00
co-authored by Claude Sonnet 5
parent 5c1b31669e
commit c8ba8832c4
16 changed files with 44689 additions and 660 deletions
Download Patch File Download Diff File Expand all files Collapse all files
logs/20260912-194500/amd64/host-sample-amd64-20260912-194500.csv
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epoch_s,elapsed_s,qemu_utime_jiffies,mem_used_kb,mem_available_kb,swap_used_kb
1789256700,2,0,2413036,9726644,582664
1789256705,7,0,2517096,9622584,582664
1789256710,12,0,2486968,9652712,582664
1789256715,17,0,2470408,9669272,582664
1789256720,22,0,2498912,9640768,582664
1789256725,27,0,2532008,9607672,582664
1789256730,32,0,2545360,9594320,582664
1789256735,37,0,2527552,9612128,582664
1789256740,42,0,2557444,9582236,582664
1789256745,47,0,2574960,9564720,582664
1789256750,52,0,2533460,9606220,582664
1789256755,57,0,2537984,9601696,582664
1789256760,62,0,2560948,9578732,582664
1789256765,67,0,2555300,9584380,582664
1 epoch_s elapsed_s qemu_utime_jiffies mem_used_kb mem_available_kb swap_used_kb
2 1789256700 2 0 2413036 9726644 582664
3 1789256705 7 0 2517096 9622584 582664
4 1789256710 12 0 2486968 9652712 582664
5 1789256715 17 0 2470408 9669272 582664
6 1789256720 22 0 2498912 9640768 582664
7 1789256725 27 0 2532008 9607672 582664
8 1789256730 32 0 2545360 9594320 582664
9 1789256735 37 0 2527552 9612128 582664
10 1789256740 42 0 2557444 9582236 582664
11 1789256745 47 0 2574960 9564720 582664
12 1789256750 52 0 2533460 9606220 582664
13 1789256755 57 0 2537984 9601696 582664
14 1789256760 62 0 2560948 9578732 582664
15 1789256765 67 0 2555300 9584380 582664