kernbench2

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Author	SHA1	Message	Date
mukesh	ff7d727ddd	CCL allreduce: rename to lrab_hierarchical_allreduce + descriptive plots Rename the intercube all-reduce identity to lrab_hierarchical_allreduce (module, config key, distributed test) so the name reflects both levels it implements: LRAB intra-SIP (local reduce to center root + broadcast) and the hierarchical inter-SIP topology exchange (ring/torus/mesh). ADR-0032 slug kept as the stable decision id; pure rename, no logic change. Also in this batch: - ADR-0032 (EN+KO): document the shipped center-root bidirectional reduce (doc was stale corner-root); annotate ccl.yaml root_cube as a placeholder. - Rename allreduce + pe2pe latency plots to descriptive, title-matching filenames and retitle the in-plot headings; drop overview/overview_log. - Point the PPTX image refs at the new plot names. Doc + derived-artifact + rename only; no simulation behavior changed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>	2026-05-20 20:50:48 -07:00
mukesh	84a1325e5c	ADR-0023 D9.7: IPCQ slot-memory latency model (TCM/SRAM/HBM) Charge per-tier bandwidth + setup overhead at IPCQ slot WRITE (receiver inbound DMA, in pe_dma._handle_ipcq_inbound) and slot READ (recv consume, in pe_ipcq._handle_recv). Tier table (common/ipcq_types.py): tcm : 512 GB/s, 0 ns sram : 128 GB/s, 2 ns hbm : 32 GB/s, 6 ns Before this change, slot read/write was free regardless of buffer_kind, making memory-tier choice invisible in simulated latency. After the change, swapping buffer_kind in ccl.yaml produces measurable per-tier separation in allreduce latency. Tests: test_ipcq_buffer_kind_latency.py — three micro-tests asserting tcm < sram < hbm ordering, payload-scaling, and that buffer_kind sensitivity grows with payload (credit-only path stays fabric-bound). test_allreduce_buffer_kind_sweep.py — 12-config parametrized sweep emitting buffer_kind_sweep.png (3 lines, torus_2d). conftest sessionfinish hook generalised to dispatch multiple sweep aggregators (allreduce + buffer-kind). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>	2026-04-27 21:28:34 -07:00

Author

SHA1

Message

Date

mukesh

ff7d727ddd

CCL allreduce: rename to lrab_hierarchical_allreduce + descriptive plots

Rename the intercube all-reduce identity to lrab_hierarchical_allreduce
(module, config key, distributed test) so the name reflects both levels
it implements: LRAB intra-SIP (local reduce to center root + broadcast)
and the hierarchical inter-SIP topology exchange (ring/torus/mesh).
ADR-0032 slug kept as the stable decision id; pure rename, no logic change.

Also in this batch:
- ADR-0032 (EN+KO): document the shipped center-root bidirectional reduce
  (doc was stale corner-root); annotate ccl.yaml root_cube as a placeholder.
- Rename allreduce + pe2pe latency plots to descriptive, title-matching
  filenames and retitle the in-plot headings; drop overview/overview_log.
- Point the PPTX image refs at the new plot names.

Doc + derived-artifact + rename only; no simulation behavior changed.

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

2026-05-20 20:50:48 -07:00

mukesh

84a1325e5c

ADR-0023 D9.7: IPCQ slot-memory latency model (TCM/SRAM/HBM)

Charge per-tier bandwidth + setup overhead at IPCQ slot WRITE
(receiver inbound DMA, in pe_dma._handle_ipcq_inbound) and slot
READ (recv consume, in pe_ipcq._handle_recv). Tier table
(common/ipcq_types.py):
  tcm  : 512 GB/s, 0 ns
  sram : 128 GB/s, 2 ns
  hbm  :  32 GB/s, 6 ns

Before this change, slot read/write was free regardless of
buffer_kind, making memory-tier choice invisible in simulated
latency. After the change, swapping buffer_kind in ccl.yaml
produces measurable per-tier separation in allreduce latency.

Tests:
  test_ipcq_buffer_kind_latency.py — three micro-tests asserting
    tcm < sram < hbm ordering, payload-scaling, and that
    buffer_kind sensitivity grows with payload (credit-only path
    stays fabric-bound).
  test_allreduce_buffer_kind_sweep.py — 12-config parametrized
    sweep emitting buffer_kind_sweep.png (3 lines, torus_2d).

conftest sessionfinish hook generalised to dispatch multiple
sweep aggregators (allreduce + buffer-kind).

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

2026-04-27 21:28:34 -07:00

2 Commits