feat: full-pipeline 64k spec benchmark harness

scripts/bench-pipeline-64k.sh

@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+# bench-pipeline-64k.sh — 64k-context benchmark through the FULL speculative
+# pipeline (draft-dflash + ngram-mod) on a single backend.
+#
+# Starts llama-server with the DFlash+ngram chain, sends a ~64k-token prompt,
+# and reads the authoritative prefill / generation tok/s and draft acceptance
+# from the server's own `slot print_timing` lines.
+#
+# Usage:
+#   ./bench-pipeline-64k.sh <ROCm0|Vulkan0>
+set -euo pipefail
+
+DEVICE="${1:?usage: bench-pipeline-64k.sh <ROCm0|Vulkan0>}"
+MODEL_DIR=/home/dank/models
+MODEL_FILE=Qwen3.6-27B-Uncensored-HauhauCS-Aggressive-Q8_K_P.gguf
+DRAFT_FILE=Qwen3.6-27B-DFlash-Q8_0.gguf
+LLAMA_SERVER=/home/dank/llama.cpp/build/bin/llama-server
+MODEL="$MODEL_DIR/$MODEL_FILE"
+DRAFT="$MODEL_DIR/$DRAFT_FILE"
+
+PORT=7891
+CTX=65536
+PARALLEL=1
+BATCH=2048
+UBATCH=1024
+OUT_TOKENS=256
+LOG="/tmp/pipeline-$DEVICE.log"
+
+for f in "$MODEL" "$DRAFT"; do
+    [[ -f "$f" ]] || { echo "missing: $f" >&2; exit 1; }
+done
+
+: > "$LOG"
+echo "=== 64k full-pipeline bench: device=$DEVICE ==="
+
+"$LLAMA_SERVER" \
+    --model "$MODEL" \
+    --spec-draft-model "$DRAFT" \
+    --spec-type "draft-dflash,ngram-mod" \
+    --spec-draft-n-max 8 \
+    --spec-ngram-mod-n-min 48 \
+    --spec-ngram-mod-n-max 64 \
+    --spec-ngram-mod-n-match 24 \
+    --device "$DEVICE" \
+    --gpu-layers all \
+    --cache-type-k q8_0 \
+    --cache-type-v f16 \
+    --ctx-size "$CTX" \
+    --parallel "$PARALLEL" \
+    --batch-size "$BATCH" \
+    --ubatch-size "$UBATCH" \
+    --alias bench \
+    --host 127.0.0.1 \
+    --port "$PORT" \
+    >> "$LOG" 2>&1 &
+SERVER_PID=$!
+trap 'kill $SERVER_PID 2>/dev/null; wait $SERVER_PID 2>/dev/null' EXIT
+
+echo "server pid $SERVER_PID on 127.0.0.1:$PORT"
+echo -n "waiting for server"
+ready=0
+for i in $(seq 1 400); do
+    if curl -sf "http://127.0.0.1:$PORT/health" >/dev/null 2>&1; then
+        echo " [ready]"
+        ready=1
+        break
+    fi
+    echo -n "."
+    sleep 2
+done
+[ "$ready" = "1" ] || { echo " FAIL"; tail -25 "$LOG"; exit 1; }
+
+# --- drive a ~64k-token generation, then pull timings from the server log ---
+python3 - "$DEVICE" "$PORT" "$OUT_TOKENS" "$LOG" <<'PY'
+import sys, time, json, urllib.request, os
+device, port, out_tokens, log = sys.argv[1], sys.argv[2], int(sys.argv[3]), sys.argv[4]
+
+# Build a prompt that actually occupies ~64k tokens. Tokenizer demo data:
+# this model averages ~0.25 tokens/char; ~250k chars -> ~62k tokens.
+unit = ("The careful study of natural language reveals patterns of meaning that "
+        "emerge from the deliberate arrangement of words and phrases, and the "
+        "patient reader soon learns to recognize the structure beneath the surface. ")
+prompt = unit * 1900  # ~250k chars
+
+body = json.dumps({
+    "prompt": prompt,
+    "max_tokens": out_tokens,
+    "temperature": 0.0,
+    "stream": False,
+}).encode()
+req = urllib.request.Request(f"http://127.0.0.1:{port}/v1/completions",
+                             data=body, headers={"Content-Type": "application/json"})
+t0 = time.time()
+with urllib.request.urlopen(req, timeout=3600) as resp:
+    out = json.load(resp)
+dt = time.time() - t0
+pt = out.get("usage", {}).get("prompt_tokens", 0)
+ct = out.get("usage", {}).get("completion_tokens", 0)
+print(f"request done: prompt_tokens={pt} completion_tokens={ct} wall={dt:.1f}s", flush=True)
+
+# The server log already printed authoritative per-slot timings; surface them.
+lines = open(log, encoding="utf-8", errors="ignore").read().splitlines()
+prompt_evals = [l for l in lines if "prompt eval time" in l]
+evals       = [l for l in lines if "      eval time" in l and "prompt eval" not in l]
+accepts     = [l for l in lines if "draft acceptance" in l]
+
+def grab(lines, label):
+    if lines:
+        print(label + ": " + lines[-1].strip())
+
+grab(prompt_evals, "PREFILL(timing)")
+grab(evals, "GENERATION(timing)")
+grab(accepts, "DRAFT_ACCEPTANCE")
+print(f"prompt_tokens={pt} completion_tokens={ct} wall={dt:.1f}s")
+PY