F331 deterministic bounded renewal jitter checks
Date: 2026-08-07 UTC
Host: cuda-ke
Kernel: Linux 7.0.0-28-generic x86_64
Python: 3.12.3
MPI: Open MPI 4.1.6 / mpi4py 4.1.1 / MPI 3.1

Static and syntax checks
- ruff touched production/test/evidence Python: pass
- AST parse touched Python files: pass
- git diff --check: pass
- evidence-directory __pycache__ residue: none

Tests
- directed protocol/jitter/cache tests: 17 passed, 5 subtests in 1.28 s
- related MPI/distributed/hybrid tests: 296 passed, 26 subtests in 15.91 s
- full warnings-as-errors Python regression: 692 passed, 46 subtests in 96.73 s

Synthetic cohort schedule
- jobs/generations/events: 1024/12/12288
- base interval/jitter/window: 60 s / 0.1 / [60, 66) s
- bucket width: 100 ms
- fixed peak/nonempty buckets: 1024/12
- jittered peak/nonempty buckets: 26/2232
- peak reduction: 97.4609375%
- observed delay range: 60.000907865..65.999094696 s
- per-generation peaks: 26/26/20/22/18/18/15/13/13/14/14/15
- event conservation and all JSON assertions: pass
- scheduling cost warm-ups/repetitions: 2/20
- fixed/jittered median: 1.102851/1.766609 us per generation decision
- production due/snapshot hash cache across completion: covered by directed test

Real MPI transport with synthetic topology
- MPI ranks: 7
- standalone masters/workers: 2/5
- processor identity source: test wrapper injection
- configured interval/jitter: 0.12 s / 0.5
- actual MPI communicator and worker lifecycle: true
- actual remote filesystem clients: false
- generations per master: 5/5
- attempts/successes/failures per master: 5/5/0
- identical last/next schedules for this epoch: 0.145894947/0.126152756 s
- cross-run schedule values are epoch-dependent; equality and bounds are invariants
- return code: 0
- worker shutdown ACKs: 5/5

Real same-host anti-false-positive
- MPI ranks and masters/workers: 7 and 2/5
- configured interval/jitter: 0.05 s / 0.5
- cluster_lock_verified: false
- cross-host rounds: 0
- runtime renewal metrics emitted: false
- return code and worker ACKs: 0 and 5/5

Strict evidence boundaries
- synthetic_schedule=true
- synthetic_topology=true
- deployment_evidence=false
- actual_multi_host=false
- filesystem_io_measured=false
- real_shared_storage_backend_tested=false
- server_failover_tested=false
- network_partition_tested=false
- mpi_rank_failure_recovery_tested=false
- physical_power_cut_tested=false
- dse_throughput_benchmarked=false
- solver_or_coverage_uplift_measured=false
- lava_m_campaign_run=false

Repository inventory after F331
- documented SYMCC configuration names: 410
- top-level test files: 246