 ywkang
|
357cab525b
|
ADR-0026: DPPolicy intra-device only + ShardSpec structural coords
DPPolicy no longer carries a cross-SIP axis. SIP-level placement is
solely controlled by torch.ahbm.set_device(rank) (ADR-0024); DPPolicy
itself describes only the cube × PE layout within one SIP. ShardSpec
switches to structural (sip, cube, pe) coordinates; the flat pe_index
field/property is fully removed — silent drift between global-flat and
SIP-local interpretations was a foot-gun flagged by ADR-0024 D11.
Breaking API (explicit TypeError / AttributeError):
- DPPolicy(sip=...) / DPPolicy(num_sips=...) -> TypeError
- ShardSpec.pe_index -> AttributeError
- ShardSpec(pe_index=...) -> TypeError
- resolve_dp_policy now takes target_sip= (required), no num_sips.
Downstream migration:
- PE allocator dict keyed by (sip, cube, pe) tuples, in both
_ensure_allocators and _free_tensor. deploy_tensor uses tuple lookup.
- _create_tensor passes target_sip=current_sip; post-hoc pe_index
shifting removed entirely.
- launch._compute_local_shape drops the dp.sip branch.
- Internal resolvers (column_wise / row_wise / replicate / tiled_*)
return _LocalPeShard (cube-local identifier) instead of ShardSpec —
resolve_dp_policy lifts them to full structural coords.
Tests:
- New tests/test_adr0026_dppolicy_intra_device.py (12 tests) pins the
contract end-to-end.
- test_sip_parallel.py rewritten: SIP composition now modeled as two
resolve_dp_policy(target_sip=...) calls (ADR-0024 launcher style).
- Call-site migration: test_tensor, test_va_integration, test_va_offset,
test_runtime_api_tensor, test_tl_recv_async, test_ccl_* and benches
gemm_single_pe, gpt3_qkv, va_offset_verify, ccl_allreduce (legacy
branch) all use intra-device DPPolicy and structural ShardSpec.
Result: 523 passed, 1 strict xfail (ring_default_ws — unchanged
ADR-0024 Phase B blocker; architectural fix deferred to ADR-0027).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
|
2026-04-14 13:02:19 -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 |
|