600s-truncated trace + LPWL 5-policy results

traces/w600_r0.0015_st30_first600s.jsonl: first-600s cut of the shipped w600
trace (807 reqs, 274 sessions, all turn-1s + early later-turns; theoretical
APC ceiling ~70% vs 80% full). Faster iteration (~18 min/arm) but a colder,
lower-locality regime; whitelisted alongside the parent anonymized trace.

analysis/lpwl_5policy_600s.md: LPWL vs LMetric/sticky/unified/unified+A+B on
the 600s trace (dash1 8xH20, cold APC, n=1). LPWL is overall best with zero
knobs — TTFT p90 7983ms vs tuned A+B 11562 (-31%), E2E p90 -16%, best request
balance; APC 0.648 (emergent affinity, far above LMetric 0.507); only loss is
E2E p99 from heavy-class decode concentration. Demonstrates anti-overfit: A+B
was tuned on full w600 yet is beaten by the knob-free policy on this regime.
Includes the run_5policy_600s.sh repro driver.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

microbench/connector_tax/cache_sweep/run_5policy_600s.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# 5-policy comparison on the first-600s trace, fresh vLLM (cold APC) each arm.
+#   leastwork    LPWL (parameter-free)
+#   unified_ab   unified hybrid, A+B' tuned (of=1.3, lmw=0.01)
+#   unified_def  unified hybrid, defaults  (of=2.0, lmw=0.0)
+#   lmetric      P_tokens x BS, no affinity
+#   sticky       hard session affinity
+set -uo pipefail
+export ROOT=/home/admin/cpfs/wjh/agentic-kv
+export MODEL=/home/admin/cpfs/wjh/models/Qwen/Qwen3-Coder-30B-A3B-Instruct
+TRACE="${TRACE:-$ROOT/traces/w600_r0.0015_st30_first600s.jsonl}"
+DATE="$(date +%Y%m%d_%H%M)"
+OUT="${OUTROOT:-$ROOT/outputs/policy5_600s_$DATE}"
+mkdir -p "$OUT"
+echo "OUTROOT=$OUT" | tee "$OUT/RUNINFO.txt"
+echo "TRACE=$TRACE  ($(wc -l < "$TRACE") reqs)" | tee -a "$OUT/RUNINFO.txt"
+date | tee -a "$OUT/RUNINFO.txt"
+
+run_arm() {  # name policy extra_args
+    local name="$1" policy="$2" extra="$3"
+    echo "===== ARM: $name (policy=$policy args='$extra') =====" | tee -a "$OUT/RUNINFO.txt"
+    local t0=$(date +%s)
+    EXTRA_PROXY_ARGS="$extra" bash "$ROOT/scripts/b3_isolated_policy.sh" \
+        "$policy" "$TRACE" "$OUT/$name" > "$OUT/$name.log" 2>&1
+    echo "$name rc=$? rows=$(wc -l < "$OUT/$name/metrics.jsonl" 2>/dev/null) dur=$(( $(date +%s) - t0 ))s" | tee -a "$OUT/RUNINFO.txt"
+}
+
+# Headline contrasts first (so a late failure still leaves the key arms).
+run_arm leastwork   leastwork ""
+run_arm unified_ab  unified   "--overload-factor 1.3 --lmetric-decode-weight 0.01"
+run_arm unified_def unified   "--overload-factor 2.0 --lmetric-decode-weight 0.0"
+run_arm lmetric     lmetric   ""
+run_arm sticky      sticky    ""
+
+echo "===== ALL DONE: $OUT =====" | tee -a "$OUT/RUNINFO.txt"
+date | tee -a "$OUT/RUNINFO.txt"