gqa short-context: exclude KV deploy from wall; correct HBM peak; batch scaffold

Metric fixes (test harnesses, deploy artifact + wrong constant):
- wall = max(t_end) - min(t_start): exclude the one-time KV-cache deploy
  from the measured decode/prefill step (it was 92-99% of wall, mapping-
  invariant, and masked the real per-mapping separation).
- PEAK_PE_HBM_BPS 128 -> 256 B/ns (8 channels/PE x 32 GB/s); the old value
  was half the modeled per-PE HBM BW, so hbm_bw_util read >1.0 once wall
  was corrected. All six short-context sweep CSVs regenerated/repatched.

Result: the four KV mappings now separate along a {64,32,16,8}-active-PE
ladder (decode 8-kv/1-kv = 4.8x at 8K, 7.4x at 64K), not "modest/tied" as
before; decode is bandwidth-bound at 46-76% of the 256 GB/s per-PE ceiling.

Report (S5.2 rewrite):
- Replace the tied-wall / 8x-per-PE-util claims (both deploy artifacts)
  with the corrected separation and a density trade-off (per-CUBE KV
  footprint, Fig 16 top panel switched to a wall-invariant metric).
- Add a projected latency-vs-batched-throughput analysis (marked
  projected, not measured): dense mappings win throughput, 1-kv wins
  latency; converges at long context.
- Regenerate Fig 15/16/17/18; fix plot script hardcoded ROOT path.

Batch experiment (Part 2, cube_base):
- Add backward-compatible cube_base=0 scalar to the decode kernel so a
  batched user placed at DPPolicy.cube_start addresses 0-based shards.
  Default preserves single-user behavior (32 decode tests pass unchanged).
- New batch harness (skipped): concurrent B>=2 launches hit a sim routing
  issue (sip0.cube0.pe8); single-user path verified. Concurrency fix next.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/report/1H-codesign-paper/sections/05-gqa.tex

@@ -141,10 +141,10 @@ CUBE to each head and uses all eight PEs of that CUBE on the head's
 sequence shard; \textsf{2-kv-per-cube} packs two heads per CUBE with
 group size four; \textsf{4-kv-per-cube} packs four heads with group size
 two; \textsf{8-kv-per-cube} loads all heads onto a single CUBE with one
-PE per head. The mapping fixes a trade-off: as KV heads per CUBE grows,
-HBM bandwidth pressure per CUBE grows linearly, the per-CUBE KV cache
-grows linearly, but the intra-CUBE IPCQ broadcast/reduce cost shrinks to
-zero (8-kv-per-cube uses a single PE per head and has no group
+PE per head. The mapping fixes a trade-off: as KV heads per CUBE grows, the per-CUBE KV
+footprint grows linearly and the mapping uses proportionally fewer CUBEs
+(eight down to one), but the intra-CUBE IPCQ broadcast/reduce cost shrinks
+to zero (8-kv-per-cube uses a single PE per head and has no group
 communication).
 
 A second axis is how each GEMM tile is issued. We isolate this with three
@@ -160,101 +160,130 @@ We sweep all four mappings $\times$ three composite tiers $\times$
 $S_{kv}\in\{8\text{K},16\text{K},32\text{K},64\text{K}\}$ for both
 phases (prefill uses $T_q{=}8$ sliced tiles; decode uses $T_q{=}1$). The
 headline latency comparison is in Figure~\ref{fig:gqa-short-wall-baseline}.
-At short context the two mappings are effectively tied, and they separate
-as context grows: the $\textsf{8-kv-per-cube}/\textsf{1-kv-per-cube}$
-latency ratio rises monotonically with $S_{kv}$ (decode: $0.98\times$ at
-$8$K---within measurement noise---to $1.06\times$ at $64$K, where
-\textsf{1-kv-per-cube} is the faster; prefill follows the same trend). The
-wall gap is
-modest because short-context decode is dominated by setup overhead and
-its $M{=}G{=}8$ skinny shape leaves the MAC array idle most of the time;
-where the mappings really separate is per-CUBE pressure.
+The mappings separate cleanly, and in proportion to how many PEs each
+dedicates to a head: \textsf{1-kv-per-cube} spreads one head across all
+eight PEs of its CUBE, \textsf{8-kv-per-cube} gives each head a single PE,
+and the four mappings form a $\{64,32,16,8\}$-active-PE ladder. Decode
+latency tracks that ladder inversely---at $S_{kv}{=}64$K the
+\textsf{8-kv-per-cube}/\textsf{1-kv-per-cube} ratio is $7.4\times$
+($\SI{87.0}{}$ vs.\ $\SI{11.8}{\micro\second}$), and even at $8$K it is
+$4.8\times$ ($\SI{10.8}{}$ vs.\ $\SI{2.2}{\micro\second}$); prefill shows
+the same ordering more gently ($2.3\times$ at $64$K). The reason is that
+decode here is \emph{bandwidth-bound}: each active PE streams its KV shard
+at \SI{46}{}--\SI{76}{\percent} of the \SI{256}{\giga\byte\per\second}
+per-PE ceiling (rising with context), so a mapping's speed is set by how
+many PEs it puts to work---more PEs, more aggregate HBM bandwidth, lower
+latency. The $M{=}G{=}8$ score GEMM is skinny and leaves the MAC array
+lightly loaded throughout; the lever here is data movement, not compute.
 
 \begin{figure}[t]
 \centering
 \includegraphics[width=\linewidth]{gqa_short_context/wall_variant1_mode_compare.png}
 \caption{Wall-clock latency of the four short-context mappings, baseline
-kernel (no composite). Prefill and decode follow the same ordering; the
-two mappings are effectively tied at $8$K and separate as context grows,
-the \textsf{8-kv-per-cube}/\textsf{1-kv-per-cube} ratio widening from
-$0.98\times$ at $8$K to $1.06\times$ at $64$K (\textsf{1-kv-per-cube}
-faster at the large end). The composite and
-softmax\_merge tiers track the baseline within a few percent at this
-shape (see Figure~\ref{fig:gqa-short-a1-variant}).}
+kernel (no composite; log scale). The mappings separate along the
+$\{64,32,16,8\}$-active-PE ladder set by heads-per-CUBE:
+\textsf{1-kv-per-cube} (64 PEs) is fastest and \textsf{8-kv-per-cube}
+(8 PEs) slowest, by $4.8\times$ at $8$K growing to $7.4\times$ at $64$K in
+decode ($2.3\times$ at $64$K in prefill). Decode is bandwidth-bound, so
+latency scales inversely with the number of active PEs. Composite tiers
+track the baseline at this skinny shape
+(Figure~\ref{fig:gqa-short-a1-variant}).}
 \label{fig:gqa-short-wall-baseline}
 \end{figure}
 
-Figure~\ref{fig:gqa-short-tradeoff} makes the per-CUBE trade-off
-explicit. Per-PE HBM bandwidth utilization is $\sim$\,$8\times$ higher on
-\textsf{8-kv-per-cube} than on \textsf{1-kv-per-cube} at every context
-length: putting all heads on a single CUBE saturates that CUBE's HBM
-channel while leaving seven CUBEs idle, whereas spreading one head per
-CUBE keeps each CUBE's read bandwidth well below the
-\SI{256}{\giga\byte\per\second} per-PE ceiling. IPCQ traffic moves in the
-opposite direction---\textsf{1-kv-per-cube} pays the broadcast or
-chain-reduce cost across all eight PEs, while \textsf{8-kv-per-cube} pays
-nothing---but absolute IPCQ volume stays under \SI{120}{\kibi\byte} per
-run, two orders of magnitude below the HBM traffic. Because per-PE HBM
-bandwidth and per-CUBE KV cache (which grows as $\text{kv\_per\_cube}\times
-S_{kv}\times d_{\text{head}}$, so $8\times$ more on
-\textsf{8-kv-per-cube}) both scale with the number of heads on a CUBE,
-the small wall advantage of \textsf{1-kv-per-cube} compounds with much
-larger headroom for longer contexts and for batched serving---which is
-why it is the choice carried into long context (\S\ref{sec:gqa-long}).
+Figure~\ref{fig:gqa-short-tradeoff} shows what the mappings trade for that
+latency. The differentiator is \emph{density}: \textsf{8-kv-per-cube}
+concentrates all eight heads onto one CUBE, so its per-CUBE KV footprint is
+$8\times$ that of \textsf{1-kv-per-cube} (one CUBE per head), and it
+occupies a single one of the SIP's sixteen CUBEs against
+\textsf{1-kv-per-cube}'s eight. Per-PE HBM \emph{utilization}, by contrast,
+is similar across mappings---every active PE runs near the same
+\SI{46}{}--\SI{76}{\percent} of the per-PE ceiling---so the latency ladder
+comes from the \emph{count} of active PEs, not from any per-PE
+concentration. IPCQ traffic runs opposite to density:
+\textsf{1-kv-per-cube} pays the eight-PE chain-reduce while
+\textsf{8-kv-per-cube} (one PE per head) pays none, but absolute IPCQ volume
+stays under \SI{120}{\kibi\byte} per run, two orders of magnitude below the
+HBM traffic. The result is a genuine trade-off rather than a single winner:
+\textsf{1-kv-per-cube} minimizes per-request latency by spending the most
+hardware (eight CUBEs, 64 PEs) on one request, while denser mappings leave
+CUBEs free for other requests---the batched-serving axis taken up below.
 
 \begin{figure}[t]
 \centering
 \includegraphics[width=\linewidth]{gqa_short_context/per_cube_tradeoff_mode_compare.png}
 \caption{Per-CUBE trade-off across the four mappings (baseline kernel;
-HBM and IPCQ totals are variant-invariant). Top row: per-PE HBM
-bandwidth utilization---\textsf{8-kv-per-cube} concentrates roughly
-$8\times$ more bandwidth on a single CUBE than \textsf{1-kv-per-cube}.
-Bottom row: IPCQ traffic per run on a log scale---\textsf{1-kv-per-cube}
-pays the broadcast/reduce cost across the largest group while
-\textsf{8-kv-per-cube} (single PE per head) pays zero.}
+log scale). Top row: per-CUBE KV footprint---\textsf{8-kv-per-cube} packs
+all eight heads onto one CUBE, an $8\times$ larger per-CUBE KV than
+\textsf{1-kv-per-cube} and one CUBE used against eight (the $8\times$ ratio
+is context-invariant; the absolute footprint grows with $S_{kv}$). Bottom
+row: IPCQ traffic per run---\textsf{1-kv-per-cube} pays the eight-PE
+chain-reduce while \textsf{8-kv-per-cube} (single PE per head) pays zero.
+The density (top) is what sets how many concurrent requests a SIP can hold.}
 \label{fig:gqa-short-tradeoff}
 \end{figure}
 
-The composite ablation in Figure~\ref{fig:gqa-short-a1-variant} shows
-the three tiers within \textsf{1-kv-per-cube}: wall-clock is essentially
-unchanged across tiers ($< 0.5\%$ in either direction). This is the
-expected outcome for the decode-skinny shape---$M{=}G{=}8$ is well below
-the scheduler's $\textsf{TILE\_M}{=}32$ supertile (\S\ref{sec:gemm}), so
-the composite path pads $M$ by $4\times$ with zeros and the fusion has
-no slack to win back. The padding shows up in
-Figure~\ref{fig:gqa-short-gemm-util} as inflated GEMM engine utilization
-on the composite and softmax\_merge tiers (roughly $3$ and $6\times$ the
-baseline), which is bookkeeping cost rather than added useful work.
-Demonstrating fusion benefit therefore requires lifting $M$---either by
-batching multiple users (a separate batched-$M$ kernel, deferred to
-\S\ref{sec:future}) or by the long-context path, where Q-tile splitting
-yields a larger $M$ per PE. In the short-context regime the contribution
-of composite/softmax\_merge is a no-regression dispatch-cost isolation;
-the substantive design lever is the mapping, and
-\textsf{1-kv-per-cube} wins it.
+The composite ablation in Figure~\ref{fig:gqa-short-a1-variant} shows the
+three tiers within \textsf{1-kv-per-cube}: wall-clock is nearly flat, with
+the GEMM-only composite tier a few percent \emph{slower}
+(\SI{14.0}{} vs.\ \SI{11.8}{\micro\second} at $64$K decode) and the
+\textsf{softmax\_merge} tier matching the baseline. This is the expected
+outcome for the decode-skinny shape---$M{=}G{=}8$ is well below the
+scheduler's $\textsf{TILE\_M}{=}32$ supertile (\S\ref{sec:gemm}), so the
+composite path pads $M$ by $4\times$ with zeros and the fusion has no slack
+to win back; the padding is pure overhead here. It shows up in
+Figure~\ref{fig:gqa-short-gemm-util} as inflated GEMM-engine busy time on
+the composite tiers---the padded-$M$ GEMM is charged in full against a
+sub-\SI{15}{\micro\second} decode wall, driving the accounted utilization
+well above the baseline's \SI{12}{}--\SI{18}{\percent}. Fusion benefit
+requires lifting $M$, either by the long-context Q-tile split
+(\S\ref{sec:gqa-composite}) or by batching multiple users---which is also
+the lever that converts a mapping's density into throughput.
+
+\paragraph{Latency versus batched throughput (projected).} The latency
+ladder and the density trade-off pull in opposite directions once a SIP
+serves more than one request. Decode users are independent---each attends
+its own KV cache---and these mappings generate no cross-CUBE traffic, so a
+SIP can run several users at once on disjoint CUBE groups, up to $16/C$
+users: two for \textsf{1-kv-per-cube}, sixteen for \textsf{8-kv-per-cube}.
+Projecting from the measured single-user latencies under perfect overlap
+(an idealization---no concurrent multi-user run has been measured yet; see
+\S\ref{sec:future}), aggregate throughput at a full SIP is
+$\text{users}/\text{latency}$: at $8$K it rises from \SI{0.89}{}
+(\textsf{1-kv-per-cube}, 2 users) to \SI{1.48}{}~requests\,/\,\si{\micro\second}
+(\textsf{8-kv-per-cube}, 16 users), so the \emph{dense} mapping wins on
+throughput even though it is the \emph{slowest} per request; at $64$K the
+projected throughputs converge (\SI{0.17}{}--\SI{0.18}{}) because latency
+there already scales as $1/C$. The design conclusion is therefore
+regime-dependent: \textsf{1-kv-per-cube} is the latency-optimal choice for
+single-stream or low-batch decode, while denser mappings are the
+throughput-optimal choice for high-batch short-context serving. These are
+\emph{projections} assuming zero cross-user interference; validating them
+against a concurrent multi-user run is 2H work (\S\ref{sec:future}).
 
 \begin{figure}[t]
 \centering
 \includegraphics[width=\linewidth]{gqa_short_context/wall_a1_variant_compare.png}
-\caption{Composite-tier ablation on \textsf{1-kv-per-cube}: wall-clock
-latency is flat across the three tiers within $0.5\%$. With
-$M{=}G{=}8 < \textsf{TILE\_M}{=}32$, the composite scheduler pads the
-$M$ dimension $4\times$ and any fusion overlap is absorbed by the
-padding overhead. Fusion benefit is exercised only when $M$ fills the
-supertile---batched-$M$ inference or long-context Q-tile splitting.}
+\caption{Composite-tier ablation on \textsf{1-kv-per-cube} (log scale):
+wall-clock is nearly flat across tiers---the GEMM-only composite runs a few
+percent slower (padding overhead) and \textsf{softmax\_merge} matches the
+baseline. With $M{=}G{=}8 < \textsf{TILE\_M}{=}32$ the composite scheduler
+pads $M$ by $4\times$, leaving no fusion slack to recover at this shape.
+Fusion pays off only when $M$ fills the supertile---long-context Q-tile
+splitting or batched-$M$ inference.}
 \label{fig:gqa-short-a1-variant}
 \end{figure}
 
 \begin{figure}[t]
 \centering
 \includegraphics[width=\linewidth]{gqa_short_context/gemm_util_a1_variant_ablation.png}
-\caption{GEMM engine utilization on \textsf{1-kv-per-cube} across the
-three composite tiers. The $\sim 3$ and $\sim 6\times$ rise on the
-composite and softmax\_merge tiers reflects supertile padding (the
-$8\!\to\!32$ pad in $M$) being accounted as GEMM time, not added useful
-work. With actual $M=8$, the engine is below \SI{2}{\percent} busy in
-all tiers---the kernel is firmly setup- and KV-bandwidth-bound at this
-shape.}
+\caption{GEMM-engine busy fraction on \textsf{1-kv-per-cube} across the
+three composite tiers. The baseline runs at \SI{12}{}--\SI{18}{\percent};
+the composite tiers read much higher---up to and past
+\SI{100}{\percent} of the short decode wall---because the padded
+$8\!\to\!32$ $M$ dimension is charged as GEMM time, bookkeeping overhead
+rather than useful work. The engine is never the bottleneck at this shape;
+decode is KV-bandwidth-bound.}
 \label{fig:gqa-short-gemm-util}
 \end{figure}
 

docs/sweeps/plot_scripts/plot_short_context.py

@@ -23,7 +23,7 @@ from pathlib import Path
 import matplotlib.pyplot as plt
 import numpy as np
 
-ROOT = Path("/Users/lalicorne/Desktop/ahbm/kernbench2")
+ROOT = Path(__file__).resolve().parents[3]
 SWEEPS = ROOT / "docs" / "sweeps"
 OUT = (ROOT / "docs" / "report" / "1H-codesign-paper"
        / "figures" / "gqa_short_context")
@@ -156,8 +156,8 @@ def fig_wall_a1_variant_compare(fname):
 def fig_per_cube_tradeoff(fname):
     fig, axes = plt.subplots(2, 2, figsize=(13, 9))
     metrics = [
-        ("hbm_bw_util", "HBM BW utilization (per PE)", False, "{:.3f}"),
-        ("ipcq_kb",     "IPCQ traffic (KB)",           True,  "{:.1f}"),
+        ("kv_cache_per_cube_mb", "Per-cube KV footprint (MB)", True, "{:.0f}"),
+        ("ipcq_kb",              "IPCQ traffic (KB)",          True, "{:.1f}"),
     ]
     for row, (key, ylabel, log, fmt) in enumerate(metrics):
         for col, phase in enumerate(("prefill", "decode")):

docs/sweeps/short_context_decode_composite_fused_sweep.csv

@@ -1,17 +1,17 @@
 variant,mode,kv_per_cube,C,S_kv,wall_us,n_pe,gemm_util,math_count,math_pipeline_us,hbm_bw_util,hbm_read_mb,hbm_write_kb,ipcq_kb,kv_cache_per_cube_mb
-composite_fused,A1,1,8,8192,146.95153450000072,64,0.0017838806576053131,656,0.0,0.013997812319543966,16.0625,8.0,57.75,2.0
-composite_fused,A1,1,8,16384,279.867342500003,64,0.007173570099630665,1296,13.903615999992937,0.0146676634841736,32.0625,8.0,57.75,4.0
-composite_fused,A1,1,8,32768,544.5763825000042,64,0.010097125355742134,2576,41.71084799996763,0.015059411798858053,64.0625,8.0,57.75,8.0
-composite_fused,A1,1,8,65536,1074.101862500392,64,0.011619635377527878,5136,97.32531200143696,0.015262053416273654,128.0625,8.0,57.75,16.0
-composite_fused,A2,2,4,8192,140.35490875000028,32,0.01430408111743636,624,6.951807999995537,0.029254409671653128,16.03125,8.0,24.75,4.0
-composite_fused,A2,2,4,16384,273.9919487500021,32,0.020068677291975947,1264,20.855423999989405,0.029935186188568382,32.03125,8.0,24.75,8.0
-composite_fused,A2,2,4,32768,541.3734287504049,32,0.0230537210304644,2544,48.66265599996224,0.030282239817052973,64.03125,8.0,24.75,16.0
-composite_fused,A2,2,4,65536,1076.851308751879,32,0.024557433125924955,5104,104.27712000153959,0.030438742780552714,128.03125,8.0,24.75,32.0
-composite_fused,A4,4,2,8192,140.2291675000001,16,0.03921192786066565,608,10.427711999993306,0.058504233792873325,16.015625,8.0,8.25,8.0
-composite_fused,A4,4,2,16384,276.4849475001752,16,0.04514051167338893,1248,24.33132799998764,0.05930160085835996,32.015625,8.0,8.25,16.0
-composite_fused,A4,4,2,32768,549.3539675010354,16,0.04813782290440163,2528,52.13855999995954,0.059670088757369746,64.015625,8.0,8.25,32.0
-composite_fused,A4,4,2,65536,1095.4730075019588,16,0.04963405545386165,5088,107.7530240015909,0.05983534012350623,128.015625,8.0,8.25,64.0
-composite_fused,B,8,1,8192,144.10828500005923,8,0.08660620726926088,600,12.16566399999219,0.11380331116974475,16.0078125,8.0,0.0,16.0
-composite_fused,B,8,1,16384,285.6728750004253,8,0.09256988084807763,1240,26.069279999986758,0.11476063311909189,32.0078125,8.0,0.0,32.0
-composite_fused,B,8,1,32768,568.9925550010347,8,0.09555971782205692,2520,53.8765119999582,0.1152071313127828,64.0078125,8.0,0.0,64.0
-composite_fused,B,8,1,65536,1135.6319150019874,8,0.09706392938508733,5080,109.49097600161657,0.11543176822374755,128.0078125,8.0,0.0,128.0
+composite_fused,A1,1,8,8192,2.2471645000005376,64,0.11665545624270428,656,0.0,0.457688,16.0625,8.0,57.75,2.0
+composite_fused,A1,1,8,16384,4.090972500001895,64,0.4907507933676371,1296,13.903615999992937,0.501714,32.0625,8.0,57.75,4.0
+composite_fused,A1,1,8,32768,6.65601250000007,64,0.8261186408347434,2576,41.71084799996763,0.61606,64.0625,8.0,57.75,8.0
+composite_fused,A1,1,8,65536,11.786092499984429,64,1.05893212704674,5136,97.32531200143696,0.695438,128.0625,8.0,57.75,16.0
+composite_fused,A2,2,4,8192,3.8395887500001407,32,0.5228809986460942,624,6.951807999995537,0.534693,16.03125,8.0,24.75,4.0
+composite_fused,A2,2,4,16384,6.404628750001605,32,0.858544064722257,1264,20.855423999989405,0.640318,32.03125,8.0,24.75,8.0
+composite_fused,A2,2,4,32768,11.534708749999874,32,1.0820101547616419,2544,48.66265599996224,0.710638,64.03125,8.0,24.75,16.0
+composite_fused,A2,2,4,65536,21.794868749984772,32,1.21334541192213,5104,104.27712000153959,0.751966,128.03125,8.0,24.75,32.0
+composite_fused,A4,4,2,8192,5.915787499999919,16,0.9294884239792724,608,10.427711999993306,0.693399,16.015625,8.0,8.25,8.0
+composite_fused,A4,4,2,16384,11.045867500001041,16,1.1298951395303998,1248,24.33132799998764,0.742178,32.015625,8.0,8.25,16.0
+composite_fused,A4,4,2,32768,21.306027499999384,16,1.2411841672219757,2528,52.13855999995954,0.769266,64.015625,8.0,8.25,32.0
+composite_fused,A4,4,2,65536,41.82634749998455,16,1.2999645260103314,5088,107.7530240015909,0.783573,128.015625,8.0,8.25,64.0
+composite_fused,B,8,1,8192,10.856904999999854,8,1.149560763397397,600,12.16566399999219,0.75528,16.0078125,8.0,0.0,16.0
+composite_fused,B,8,1,16384,21.117065000001226,8,1.2522906947682175,1240,26.069279999986758,0.776244,32.0078125,8.0,0.0,32.0
+composite_fused,B,8,1,32768,41.637384999999774,8,1.3058641410537761,2520,53.8765119999582,0.787177,64.0078125,8.0,0.0,64.0
+composite_fused,B,8,1,65536,82.67802499997313,8,1.33323087973183,5080,109.49097600161657,0.792762,128.0078125,8.0,0.0,128.0

docs/sweeps/short_context_decode_composite_sweep.csv

@@ -1,17 +1,17 @@
 variant,mode,kv_per_cube,C,S_kv,wall_us,n_pe,gemm_util,math_count,math_pipeline_us,hbm_bw_util,hbm_read_mb,hbm_write_kb,ipcq_kb,kv_cache_per_cube_mb
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docs/sweeps/short_context_decode_sweep.csv

@@ -1,17 +1,17 @@
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docs/sweeps/short_context_prefill_composite_fused_sweep.csv

@@ -1,17 +1,17 @@
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docs/sweeps/short_context_prefill_composite_sweep.csv

@@ -1,17 +1,17 @@
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docs/sweeps/short_context_prefill_sweep.csv

@@ -1,17 +1,17 @@
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