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22fd0d2b9d18d819e357cc84a8ae36f236f923e4
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3 Commits

Author SHA1 Message Date
ywkang 22fd0d2b9d ADR: introduce docs/history/, merge 0011+0018, prune migration cruft 
- CLAUDE.md: add ADR Lifecycle subsection (superseded → docs/history/,
  immutable numbering, no renumber)
- ADR-0011: merge ADR-0018 content as "Address Model: LA" section
  alongside PA / VA; status notes VA model is currently implemented
- ADR-0018 / 0029 / 0031: moved to docs/history/ with status updates
  (0018 merged into 0011, 0029 superseded by 0032, 0031 absorbed
  into 0001 rev 2)
- ADR-0019: rewrite Context as PE-HBM connectivity decision
  (self-contained, no LA model framing)
- ADR-0019/0020/0021/0023/0025/0027: Status Proposed → Accepted
  (code verified) and prune Implementation Notes / Affected files /
  Test strategy / "현재 상태" sub-sections describing pre-impl state
- ADR-0024/0026: same migration-flavor cleanup; 0026 also drops D6
  Migration and D8 docs-update sub-decisions
- ADR-0030: status simplified (blocker ADR-0031 now superseded)
- SPEC.md: R10 + §0.2 reflect PA / VA / LA model names
- ADR-0008/0012/0013: refresh ADR-0011 subtitle in Links

21 files changed, 553 insertions(+), 1290 deletions(-).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
 2026-05-19 11:42:45 -07:00
ywkang e7f376ebaa ADR-0027 rev7 (Megatron TP + worker-wait generalization) + ADR-0026 typo fix 
ADR-0027 is a design-only change (no production code). Rev 7 closes design
across 7 iterations of review. Key decisions:

- D0 (worker-wait generalization): ctx.wait in worker context yields to
  main scheduler, which drains env.run. Solves ADR-0024 Phase B orphan
  bug (ring_default_ws strict xfail). Normative contracts on resume
  invariant, fast-path, main-context non-reentrance, barrier
  loop-until-empty, and scheduler non-progress as user contract.
- D0.5 (host-read barrier): Tensor.numpy/data/__getitem__/__repr__/copy_
  auto-drain pending before reading. Closed-set via explicit registry
  (T5.g). copy_ uses global-pending barrier with explicit
  over-serialization tradeoff.
- D1 (torch.multiprocessing.spawn): real-PyTorch API-signature parity,
  cooperative greenlet scheduler internally. Explicit non-goal on
  process isolation / address space / failure isolation. Sibling
  cleanup via SystemExit + SpawnException(errors) wrapping root-cause
  ranks.
- D4/D5 (TP layers): ColumnParallelLinear / RowParallelLinear use
  torch.launch(gemm_kernel) — no host-side torch.matmul. Yield-safety
  contract normatively required for all TP forward paths.
- Supersedes ADR-0024 D7/D12/D13 as design (none landed). Source of
  truth declared normative.

Test strategy: T1-T8 with numerical-correctness primary (not mean/
aggregate-only), orphan invariant direct assertion, host-read barrier
closed-set via registry. Phase 2 acceptance = 524 passed + 0 xfail
(ring_default_ws unblocked by D0).

ADR-0026 typo fix: torch.cuda.set_device → torch.ahbm.set_device in
DPPolicy docstring (ADR-0024 D10 convention).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-14 14:13:26 -07:00
ywkang e1084800ab docs: add ADRs 0024–0031 for SIP-TP launcher stack 
ADR-0024 (SIP-level TP launcher): rank = SIP abstraction, engine-routed
  install, mp.spawn parity, epoch barrier, ShardSpec structural coords.
ADR-0025 (IPCQ direction addressing): address-based matching for meta
  arrival and credit return; fixes 2-rank bidirectional ring deadlock.
ADR-0026 (DPPolicy intra-device only): remove sip/num_sips fields;
  ShardSpec uses structural (sip, cube, pe); pe_index property removed.
ADR-0027 (Megatron-style TP API): ColumnParallelLinear / RowParallelLinear
  on top of ADR-0024 launcher. Backlog until 0024/0025/0026 land.
ADR-0028 (DTensor support): stub / future work.
ADR-0029 (Hierarchical all-reduce): 3-level reduce using all_pes mapper
  and multi_pe_sip_local validator from ADR-0024. Backlog.
ADR-0030 (IPCQ PhysAddr integration): blocked on ADR-0031.
ADR-0031 (PhysAddr PE-resource extension): stub; local_offset range-based
  partition approach; specific ranges TBD.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-14 00:38:27 -07:00