mukesh
ff7d727ddd
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>
51 lines
1.9 KiB
YAML
51 lines
1.9 KiB
YAML
# ccl.yaml — CCL backend (ahbm) configuration (ADR-0023 D11)
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#
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# Loaded by AhbmCCLBackend at init_process_group time.
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# defaults.algorithm chooses which kernel + topology is installed
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# into PE_IPCQ neighbor tables. Host code is unaware of these settings.
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defaults:
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# Algorithm to run for this benchmark execution.
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algorithm: lrab_hierarchical_allreduce
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# IPCQ ring buffer location.
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# tcm — PE-local TCM (fast, small, conflicts with compute TCM access)
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# hbm — PE-local HBM (large, slower DMA latency)
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# sram — Cube-shared SRAM (medium, cube-internal contention)
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buffer_kind: tcm
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# Backpressure mode.
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# poll — spin-loop polling of cached peer pointers
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# sleep — yield SimPy event, wake on credit return
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backpressure: sleep
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# Ring depth: number of slots per (direction, tx|rx) buffer.
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n_slots: 4
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# Slot size in bytes (must hold one tile worth of data).
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slot_size: 4096
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# PE_DMA virtual channel chunk size (D8).
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vc_chunk_size: 256
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# Credit return fast path message size (D9).
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ipcq_credit_size_bytes: 16
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algorithms:
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# ── intercube all-reduce (pe0-only, cube mesh + inter-SIP) ──
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# Reduces across the 4×4 cube mesh within each SIP, then inter-SIP
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# exchange on root cube, then broadcast back. SIP topology is read
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# from topology.yaml → system.sips.topology. Kernel auto-selects
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# ring / torus / mesh inter-SIP exchange pattern.
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lrab_hierarchical_allreduce:
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module: kernbench.ccl.algorithms.lrab_hierarchical_allreduce
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topology: none
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buffer_kind: tcm
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n_elem: 8
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# root_cube: the kernel currently elects the root dynamically as the
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# geometric center of the cube mesh (root = (h//2)*w + (w//2)) to
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# minimize the intra-SIP critical path, so this value is NOT read today.
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# Kept as a placeholder for a future explicit-root override / runtime
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# election hook (see ADR-0032 D1 + Non-goals).
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root_cube: 15
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