ywkang
0bf220fed0
Replaces the latency-breakdown stacked bars with a single utilization
bar per scenario. Each bar shows ``effective_bw / peak_bottleneck_bw``
with both values annotated, and a horizontal "single-path peak" line at
100 %. The colour band (green ≥70 %, amber ≥40 %, red <40 %) makes the
no-congestion distance roll-off scannable at a glance.
Definitions:
effective_bw = (total bytes transferred) / wall-clock time
no_congestion: nbytes / total_ns
congestion: n_issuers × nbytes / makespan_ns (aggregate)
peak_bw = min(edge.bw_gbs) on first issuer's path
util_pct = effective_bw / peak_bw × 100
The congestion graph shows that 8×PE eastbound exceeds 100 % of a
single-path peak (106.4 %): UCIe-N's 4 connections × 128 GB/s give
512 GB/s of aggregate eastbound capacity, so concurrent issuers across
disjoint conns sum past any single conn's 128 GB/s. The 8×PE→pe0_slice
hotspot reaches 91.7 %, almost saturating the shared r0c0→hbm_ctrl.pe0
bottleneck — the simulator's address-based PC striping + per-flit
arbitration model amortises the cost cleanly.
Self-verification updated to BW invariants:
(1) effective BW shrinks as topological distance grows
(2) util_pct ∈ (0, 250 %]
(3) single-issuer util_pct ≤ 100 %
(4) effective_bw = nbytes / total_ns for single requests
(5) congestion aggregate BW grows monotonically with issuer count
on the hot-target series
(6) 8-PE all-hit-pe0 saturates ≥ 70 % of shared peak
All checks PASS at the current model.
The CSV retains all breakdown components (pe_setup, noc_mesh, ucie,
fabric, streaming, hbm_ctrl, contention) so a future replot can still
recover the latency-breakdown view without re-running the simulator.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
4.1 KiB
4.1 KiB
| 1 | graph | scenario | label | nbytes | n_issuers | total_ns | makespan_ns | min_lat_ns | bottleneck_bw_gbs | effective_bw_gbs | util_pct | pe_setup | noc_mesh | ucie | fabric | streaming | hbm_ctrl | contention | path | first_path |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 | no_congestion | local | SAME_CUBE PE_LOCAL | 16384 | 1 | 77.0 | 256.0 | 212.7792207792208 | 83.11688311688312 | 1.0 | 2.0 | 0.0 | 0.0 | 63.0 | 9.0 | 2.0 | pe0.pe_dma -> cube0.r0c0 -> hbm_ctrl.pe0 | |||
| 3 | no_congestion | same_cube_best | SAME_CUBE REMOTE_BEST (pe0→pe1) | 16384 | 1 | 82.06 | 256.0 | 199.6587862539605 | 77.99171338045332 | 1.0 | 5.03 | 0.0 | 0.0 | 63.0 | 9.0 | 4.030000000000001 | pe0.pe_dma -> cube0.r0c0 -> cube0.r0c1 -> hbm_ctrl.pe1 | |||
| 4 | no_congestion | same_cube_worst | SAME_CUBE REMOTE_WORST (pe0→pe7) | 16384 | 1 | 117.50000000000001 | 256.0 | 139.4382978723404 | 54.46808510638297 | 1.0 | 26.25 | 0.0 | 0.0 | 63.0 | 9.0 | 18.250000000000014 | pe0.pe_dma -> cube0.r0c0 -> cube0.r1c0 -> cube0.r1c1 -> cube0.r1c2 -> cube0.r1c3 -> cube0.r4c3 -> cube0.r4c4 -> cube0.r5c4 -> cube0.r5c5 -> hbm_ctrl.pe7 | |||
| 5 | no_congestion | remote_cube_best | REMOTE_CUBE REMOTE_BEST (cube0→cube1) | 16384 | 1 | 202.51999999999998 | 128.0 | 80.90065178747778 | 63.20363420896702 | 1.0 | 6.0 | 32.510000000000005 | 0.0 | 126.0 | 9.0 | 28.00999999999999 | pe0.pe_dma -> cube0.r0c0 -> ucie-N.conn0 -> cube0.ucie-N -> ucie-N.conn3 -> cube0.r0c5 -> ucie-E.conn0 -> cube0.ucie-E -> cube1.ucie-W -> ucie-W.conn0 -> cube1.r0c0 -> hbm_ctrl.pe0 | |||
| 6 | no_congestion | remote_cube_worst | REMOTE_CUBE REMOTE_WORST (cube0→cube15.pe7) | 16384 | 1 | 573.1199999999999 | 128.0 | 28.587381351200452 | 22.333891680625353 | 1.0 | 30.0 | 219.05999999999995 | 0.0 | 126.0 | 9.0 | 188.05999999999995 | pe0.pe_dma -> cube0.r0c0 -> ucie-N.conn0 -> cube0.ucie-N -> ucie-N.conn3 -> cube0.r0c5 -> ucie-E.conn0 -> cube0.ucie-E -> cube1.ucie-W -> ucie-W.conn0 -> cube1.r0c0 -> ucie-N.conn0 -> cube1.ucie-N -> ucie-N.conn3 -> cube1.r0c5 -> ucie-E.conn0 -> cube1.ucie-E -> cube2.ucie-W -> ucie-W.conn0 -> cube2.r0c0 -> ucie-N.conn0 -> cube2.ucie-N -> ucie-N.conn3 -> cube2.r0c5 -> ucie-E.conn0 -> cube2.ucie-E -> cube3.ucie-W -> ucie-W.conn0 -> cube3.r0c0 -> ucie-N.conn0 -> cube3.ucie-N -> ucie-N.conn3 -> cube3.r0c5 -> ucie-E.conn0 -> cube3.ucie-E -> ucie-E.conn3 -> cube3.r5c5 -> ucie-S.conn3 -> cube3.ucie-S -> cube7.ucie-N -> ucie-N.conn3 -> cube7.r0c5 -> ucie-E.conn0 -> cube7.ucie-E -> ucie-E.conn3 -> cube7.r5c5 -> ucie-S.conn3 -> cube7.ucie-S -> cube11.ucie-N -> ucie-N.conn3 -> cube11.r0c5 -> ucie-E.conn0 -> cube11.ucie-E -> ucie-E.conn3 -> cube11.r5c5 -> ucie-S.conn3 -> cube11.ucie-S -> cube15.ucie-N -> ucie-N.conn3 -> cube15.r0c5 -> ucie-E.conn0 -> cube15.ucie-E -> ucie-E.conn3 -> cube15.r5c5 -> hbm_ctrl.pe7 | |||
| 7 | no_congestion | remote_sip | REMOTE_SIP SAME_CUBE_SAME_PE (sip0→sip1) | 16384 | 1 | 408.5216666666663 | 128.0 | 40.10558395515541 | 31.332487464965165 | 1.0 | 4.0 | 37.040000000000006 | 22.09666666666667 | 126.0 | 9.0 | 209.38499999999962 | pe0.pe_dma -> cube0.r0c0 -> ucie-N.conn0 -> cube0.ucie-N -> io0.ucie-P0 -> ucie-P0.conn0 -> io0.noc -> io0.pcie_ep -> fabric.switch0 -> io0.pcie_ep -> io0.noc -> ucie-P0.conn0 -> io0.ucie-P0 -> cube0.ucie-N -> ucie-N.conn0 -> cube0.r0c0 -> hbm_ctrl.pe0 | |||
| 8 | congestion | ctrl_hot_1 | 1×PE → pe0_slice | 16384 | 1 | 82.06 | 82.06 | 256.0 | 199.6587862539605 | 77.99171338045332 | 1.0 | 5.03 | 0.0 | 0.0 | 63.0 | 9.0 | 4.030000000000001 | pe1.pe_dma -> cube0.r0c1 -> cube0.r0c0 -> hbm_ctrl.pe0 | ||
| 9 | congestion | ctrl_hot_2 | 2×PE → pe0_slice | 16384 | 2 | 158.3450000000001 | 134.2400000000001 | 256.0 | 206.94054122327813 | 80.83614891534302 | 1.0 | 5.03 | 0.0 | 0.0 | 63.0 | 9.0 | 80.31500000000011 | pe1.pe_dma -> cube0.r0c1 -> cube0.r0c0 -> hbm_ctrl.pe0 | ||
| 10 | congestion | ctrl_hot_3 | 3×PE → pe0_slice | 16384 | 3 | 230.0750000000001 | 139.94000000000008 | 256.0 | 213.6346843420623 | 83.45104857111808 | 1.0 | 5.03 | 0.0 | 0.0 | 63.0 | 9.0 | 152.0450000000001 | pe1.pe_dma -> cube0.r0c1 -> cube0.r0c0 -> hbm_ctrl.pe0 | ||
| 11 | congestion | ucie_eastbound | 8×PE corresp. cube0→cube1 | 16384 | 8 | 962.52 | 438.52 | 128.0 | 136.17587167019906 | 106.387399742343 | 1.0 | 6.0 | 32.510000000000005 | 0.0 | 126.0 | 9.0 | 788.01 | pe0.pe_dma -> cube0.r0c0 -> ucie-N.conn0 -> cube0.ucie-N -> ucie-N.conn3 -> cube0.r0c5 -> ucie-E.conn0 -> cube0.ucie-E -> cube1.ucie-W -> ucie-W.conn0 -> cube1.r0c0 -> hbm_ctrl.pe0 | ||
| 12 | congestion | all_pe_to_pe0 | 8×PE → pe0_slice | 16384 | 8 | 558.2499999999998 | 195.0 | 256.0 | 234.7908643081058 | 91.71518137035383 | 1.0 | 2.0 | 0.0 | 0.0 | 63.0 | 9.0 | 483.2499999999998 | pe0.pe_dma -> cube0.r0c0 -> hbm_ctrl.pe0 |