kernbench2

ywkang/kernbench2

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Author	SHA1	Message	Date
ywkang	fca24feac5	Fix all remaining test failures: single-cube allreduce + matplotlib dep - intercube_allreduce: add single-cube fast path that skips intra-SIP mesh reduce and goes directly to inter-SIP exchange. Fixes IPCQ deadlock when TP launches kernel on one cube per SIP. - distributed.py: derive effective cube dims from tensor shard placement instead of hardcoding topology mesh size. - pyproject.toml: add matplotlib>=3.7 to dependencies. - pe_dma.py (prior commit): add MMU translation in pipeline DMA path. 577 passed, 0 failed (was 529 passed, 10 failed). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-27 21:25:31 -07:00
mukesh	90874abbfe	ADR-0023 D9: blocking credit-emit with full-path latency PE_IPCQ._handle_recv now yields-from _delayed_credit_send instead of spawning it as a fork, so the receiver's pe_exec_ns includes the credit-return cost. _credit_latency_ns switches from compute_drain_ns(path, 16) to compute_path_latency_ns(path, 16) and fixes a latent find_path bug where the destination lacked the ".pe_dma" suffix (silently returned 0 ns under the bare except). Net effect on h3/h4 inter-cube pe-to-pe latency: IPCQ >= raw DMA at every size, matching real-HW posted-write semantics. tl.send remains fire-and-forget. ADR-0023 D9 amended; new diagnostic test tests/test_pe_to_pe_diagnostic.py captures per-PE pe_exec_ns, paths, drain, and meta-arrival timing. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>	2026-04-27 15:12:38 -07:00

Author

SHA1

Message

Date

ywkang

fca24feac5

Fix all remaining test failures: single-cube allreduce + matplotlib dep

- intercube_allreduce: add single-cube fast path that skips intra-SIP
  mesh reduce and goes directly to inter-SIP exchange. Fixes IPCQ
  deadlock when TP launches kernel on one cube per SIP.
- distributed.py: derive effective cube dims from tensor shard placement
  instead of hardcoding topology mesh size.
- pyproject.toml: add matplotlib>=3.7 to dependencies.
- pe_dma.py (prior commit): add MMU translation in pipeline DMA path.

577 passed, 0 failed (was 529 passed, 10 failed).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-27 21:25:31 -07:00

mukesh

90874abbfe

ADR-0023 D9: blocking credit-emit with full-path latency

PE_IPCQ._handle_recv now yields-from _delayed_credit_send instead of
spawning it as a fork, so the receiver's pe_exec_ns includes the
credit-return cost. _credit_latency_ns switches from
compute_drain_ns(path, 16) to compute_path_latency_ns(path, 16) and
fixes a latent find_path bug where the destination lacked the
".pe_dma" suffix (silently returned 0 ns under the bare except).

Net effect on h3/h4 inter-cube pe-to-pe latency: IPCQ >= raw DMA at
every size, matching real-HW posted-write semantics. tl.send remains
fire-and-forget. ADR-0023 D9 amended; new diagnostic test
tests/test_pe_to_pe_diagnostic.py captures per-PE pe_exec_ns, paths,
drain, and meta-arrival timing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-27 15:12:38 -07:00

2 Commits