Add PE_DMA latency-breakdown plots + self-verification harness

scripts/plot_pe_dma_perf.py runs the simulator across six
no-congestion scenarios (SAME_CUBE_PE_LOCAL / REMOTE_BEST /
REMOTE_WORST, REMOTE_CUBE_BEST / REMOTE_WORST, REMOTE_SIP) and
five congestion scenarios (1/2/3 PE hot-target, 8-PE corresp.
cube-to-cube, 8-PE all-hit-pe0). It categorises actual total /
makespan into pe_setup, noc_mesh, ucie, fabric, streaming,
hbm_ctrl, and a contention residual using a wormhole-pipelined
model (first-flit arrival + (n_flits-1)/bottleneck + final
chunk_time).

Outputs:
  docs/diagrams/pe_dma_perf/no_congestion.png — single-PE latency
    by topological distance. Visualises monotonic growth from
    SAME_CUBE_PE_LOCAL (77 ns) up to REMOTE_CUBE_PE_REMOTE_WORST
    (573 ns) and REMOTE_SIP (409 ns).
  docs/diagrams/pe_dma_perf/congestion.png — makespan as concurrent
    issuer count grows. ctrl_hot_{1,2,3}=82/158/230 ns; 8-PE
    eastbound UCIe = 963 ns; 8-PE all-hit-pe0 = 558 ns.
  docs/diagrams/pe_dma_perf/summary.csv — raw rows for re-plotting.

Built-in --verify harness asserts:
  (1) distance monotonicity for no-congestion;
  (2) same-cube paths contain zero UCIe budget;
  (3) remote-cube/SIP paths carry positive UCIe budget;
  (4) breakdown is internally consistent (formula ≤ actual);
  (5) streaming term matches (n_flits-1) × flit_bytes /
      bottleneck_bw within 5 % for the local scenario;
  (6) congestion makespan is monotonic in issuer count;
  (7) 8-PE hotspot strictly exceeds 3-PE hotspot.

Cross-SIP gets a looser 70 % contention slack because the path
crosses two non-flit-aware (pcie_ep) boundaries that force
store-and-forward re-streaming the simple formula does not
attribute. Single-cube scenarios stay under 25 % residual.

All checks PASS at the current model (post ADR-0019 D1/D4
per-PE HBM CTRL restoration).

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

This commit is contained in:

Yangwook Kang

2026-05-15 01:23:42 -07:00

parent b8213d43a9

commit a759d58007

4 changed files with 626 additions and 0 deletions

docs/diagrams/pe_dma_perf/no_congestion.png

BIN

View File

Binary file not shown.

After

Width: | Height: | Size: 60 KiB