Record PR42 page-base-flight research evidence

[FujitsuPolycom]

Resulting behavior

This draft records SparkCache PR42 opaque-page base-read-flight behavior as research-only evidence. It provides an isolated GLM-5.3 DFlash7 runtime profile, exact ARM64 image pins, stable codeword oracles, manifest inspection, bounded log parsing, and a verdict format that cannot emit a qualification status.

SparkCache's persistent base-segment host-I/O mechanism is implemented and GPU-free tested. Reconstructed page-delta admission is unsupported for GLM-5.3 by the retained semantic evidence. Cache identity, digest salts, 256-token logical geometry, and persisted schemas are unchanged.

Exact source and artifact contract

• SparkRing base: 74a6a472e7f11a56029d52b879c9b3665aa60e01
• SparkCache commit: a1511d26a1fe2b17b24561bc52e376bf7f54b06a
• SparkCache tree: 4d5b8eb8c5c13793ee7a1e67b2b34bd38fcf4ddb
• SparkCache source SHA-256: 6651f2823c816fac93779cbca54a8f19c0ed262830953149f3a87d189d1f833b
• Page-base-flight feature commit: 6f3edede4b9f707ef9e8879359b05b0775ed5fee
• Page-header accounting fix: 229d7d6158261e9510ab99d7e82d532abb9ade01
• Singleton-later-cohort fix: a1511d26a1fe2b17b24561bc52e376bf7f54b06a
• Image tag: sparkring-glm53-sparkcache:dflash7-pr42-page-base-flight-singletonfix-arm64
• Image ID: sha256:35b58a7bf414059c65b8f74e4e4b17ee6a81b7008e1bffbc9bd298b5e08c739e
• Build receipt SHA-256: ec51c5b99227fe14709977df026e25e3e60f220b81ae252155d048556e8ea90a
• Archive SHA-256: d6b29b2a3f8595a70890e1795a50c1d65951280f7a302a3b0e1edc0417e6ab55

The profile retains vLLM compiled commit da4d7be6c97434f6942292ed8abbf4b32dc44355, Python overlay commit 0b67266a0f37d6146a8403fb8482403c62f412d5, B12X commit b1d541f9e71a35f030d45fae437630fff7507c2a, lease-contract SHA-256 8adbdfa3fd4b06b213c3aab45255a0b039f1c9940a4b1fad0efd004d263227c9, and CUDA placement-library SHA-256 d57509052b73853bcc8e3c3f47bb81748d87b9cbd8d908fc20d4c79a09aa400c.

Retained live observations

Condition	Mechanical result	Semantic result	Conclusion
Sixteen concurrent 131,072-token page-delta requests with a shared 98,304-token base	Every rank recorded 16 participants, one physical base read, and 15 avoided reads	Codeword responses failed	The host-I/O mechanism worked, but the workload exceeded the 20 GiB GLM hybrid-cache residency and cannot establish correctness
Two concurrent 131,072-token page-delta requests within resident capacity	One admitted restore returned the wrong codeword; recomputation returned the correct codeword	Python and SparkCache CUDA placement both exhibited the failure	The defect is common to reconstructed page-delta admission and is not isolated to CUDA placement
One 131,072-token flat snapshot stored as 13 macro objects	Restore completed in 1.55–1.70 seconds	Exact red codeword	Full-snapshot restore is the verified operational fallback for this evidence scope

Harness contract

The harness preserves stable single-token codeword oracles and the all-rank held-digest readiness check. Publication records a scheduler-log offset before the base request and submits no private-tail request until four ranks report the held digest. Replay writes all result receipts before returning, including rejected receipts.

A mechanically complete verifier result has kind=research-verdict and status=research-only. Semantic mismatches, missing manifests, missing bounded logs, wrong flight accounting, or incomplete restore timing remain rejected evidence. The harness never starts, stops, or restarts a service.

Validation

• Focused runtime and harness tests: 11 passed
• Ruff: passed
• JSON parsing: passed
• git diff --check: passed

This draft does not qualify reconstructed page-delta restore, the image, or the GLM-5.3 runtime.

[FujitsuPolycom]

This was generated by AI during triage.

This draft records research on reconstructed page-delta admission for image sha256:35b58a7bf414059c65b8f74e4e4b17ee6a81b7008e1bffbc9bd298b5e08c739e. Its retained semantic evidence rejects that restore path, so the draft is not a candidate for main.

Closing the pull request to remove it from the active review queue. Branch codex/glm53-pr42-page-base-flight is retained with the harness and evidence.