Filename cleanup so every long-ctx GQA artifact has a consistent
"gqa_long_ctx_6cases_*" prefix (or "gqa_decode_long_ctx_6cases_*"
for decode-only charts). Old "4cases" / mixed names retired.
Renames (long_ctx + figures, content unchanged):
gqa_hbm_budget.png -> gqa_long_ctx_6cases_hbm_budget.png
gqa_4cases_summary.png -> gqa_long_ctx_6cases_summary.png
gqa_4cases_memory_comm_analytical -> gqa_long_ctx_6cases_memory_comm_analytical.png
gqa_4cases_memory_comm_paired -> gqa_long_ctx_6cases_memory_comm_paired.png
gqa_kv_sharding_6cases_diagram -> gqa_long_ctx_6cases_kv_sharding_diagram.png
gqa_kv_sharding_6cases_table -> gqa_long_ctx_6cases_kv_sharding_table.png
gqa_3cases_measured_comm.json -> gqa_long_ctx_6cases_measured_comm.json
gqa_decode_long_ctx_4cases_*.png -> gqa_decode_long_ctx_6cases_*.png
(figures dir; long_ctx never had old)
New 4-chart 6-case set in long_ctx output dir (regenerated by
paper_plot_gqa_decode_long_ctx_4cases.py, which now reads all 6
sweep_decode.json panels — Cases 1-6 with the same colour scheme
used elsewhere: red = overflow per-PE HBM, grey = neutral, blue
= Pareto-best ★):
gqa_decode_long_ctx_6cases_latency.png
gqa_decode_long_ctx_6cases_memory.png
gqa_decode_long_ctx_6cases_parallelism.png
gqa_decode_long_ctx_6cases_traffic.png
Generator scripts updated to write the new filenames + handle the
two new d_head-TP variants (Cases 4, 5) in their per-PE memory and
active-PE-count helpers. Figure widths bumped 10 -> 12 in to fit 6
multi-line case labels.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Two new long-ctx decode attention kernels for the d_head-TP sharding
variants the 6-case chart predicts:
· _gqa_attention_decode_long_ctx_cube_sp_pe_tp_dhead.py
Cube-SP × PE-TP-d_head (Case 4 in chart). Per cube holds
S_kv/C tokens of full d_head; per PE holds same tokens but
only d_head/P dims. Partial Q·Kᵀ scores reduced intra-cube
before softmax; outer (m,ℓ,O) merge two-phase (intra+inter).
· _gqa_attention_decode_long_ctx_cube_tp_dhead_pe_sp.py
Cube-TP-d_head × PE-SP (Case 5). Per cube holds full S_kv
with only d_head/C dims; per PE holds S_kv/P of those dims.
Partial scores reduced inter-cube (UCIe) before softmax.
Sweep dispatch (gqa_decode_long_ctx_4cases.py) extended with two
new panels so the milestone-1h-gqa sweep covers all 6 cases.
Smoke test scripts/verify_case4_dhead_tp.py runs Cases 4/5/6 at
S_kv=2K to validate the kernels load and execute end-to-end.
Plus the figure-generation toolchain that produced the committed
PNGs in the prior commit (dd3337f):
· paper_plot_gqa_4cases_summary.py - 3-panel summary +
2-panel (analytical / paired-measured) chart generator.
_plot_comm now takes mode="analytical" | "paired".
· paper_plot_gqa_kv_sharding_diagram.py - 6-case 2-D KV-tensor
diagram + companion comparison-table PNG.
· measure_gqa_decode_placement_comm.py - runs all 6 kernels at
S_kv=8K, sums actual IPCQ-copy bytes from engine.op_log,
scales partial-score AR ×128 to S_kv=1M, writes
gqa_3cases_measured_comm.json (committed).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
mukesh