Best stack followup 2026 05 17#26
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ctx16384_gen0512_conc1: prefill 84.05 tok/s, decode 7.011 ± 0.001. Confirms the long-context pattern from gen=128: decode steady ~7.0 tok/s, prefill ~84 tok/s (matches gen=128's 84.08). The older-engine prefill cost is stable across gen-length within a ctx tier. README/findings/manifest updated 7→8 cells. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
….error) ctx16384_gen2048_conc1 produced 10/10 timeouts at exactly 300.0 s wall time per request. Cell artifact has .error (no .done), as expected by the post-review fix to the bench-cell driver. Estimated true request length at this cell is ~480 s (186 s prefill + 293 s decode) — well over the 300 s ceiling Lemonade Server / FastAPI imposes. The entire ctx=32K tier is expected to fail the same way: at ctx=32K, prefill alone is ~371 s. Canonical Vulkan b9151 does not have this ceiling on the same hardware (its ctx=32K gen=2048 cell completes in ~250 s). This is now documented as an additional buyer-relevant finding in findings.md and as the cells_with_error_marker bookkeeping in manifest. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…ror) ctx32768_gen0128_conc1 produces 10/10 timeouts at 300.0 s — as predicted in the previous commit's known_gaps. Prefill at ctx=32K alone is ~371 s (84 tok/s × 31186 prompt tokens), already over the ceiling before any decode begins. cells_with_error_marker 1 → 2. ctx=32K gen=512 and gen=2048 still running and are expected to fail identically. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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