bench: partition operators across cards by measured cost, and rescore in place

Two pieces the parallel campaign needs.

partition.py assigns screened operators to cards longest-first. run_batch.py's
existing hash partition ignores weight: on this batch it puts the critical path
at 120 minutes and leaves a card idle, where greedy gets 70. The floor is set
by the single heaviest operator — topk alone is 70.6 minutes against an ideal
share of 45.4 — so partitioning cannot beat it, only keep the other cards from
waiting. Weights come from screen.tsv's elapsed_before + elapsed_after, which
is one pair, i.e. 2 cells; N rounds is 2N cells, so the estimate is N times the
weight. Getting that wrong reported topk as 11.8 minutes.

RESCORE=<root> re-judges an existing screening root against the current
fingerprint and rewrites its screen.tsv, keeping the original alongside. The
criterion has already changed twice — index.tsv used to be hashed, and the
switch's own ttg.rlc-* annotations had to be stripped — and the second change
moved 24 operators from 23 IR_CHANGED to 16. Rescoring the artifacts already on
disk takes seconds; re-running that screen takes 79 minutes.

ab_rlc_test.sh

@@ -39,6 +39,51 @@ set -uo pipefail
 cd "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "./_ir_fingerprint.sh"
 
+# RESCORE=<已有的 root>：判据改了之后，用当前的 ir_fingerprint 对盘上已有的 ttgir
+# 重新打分并改写该 root 的 screen.tsv，不重跑任何测量。
+#
+# 需要它是因为判据确实改过：_ir_fingerprint.sh 起初把 index.tsv 也算进哈希，后来又
+# 发现要抹掉开关自己盖的 ttg.rlc-* 属性。同一批 24 个算子，结论从 23 个 IR_CHANGED
+# 变成 16 个。重打分是秒级的，重跑那批筛选要 79 分钟。
+#
+# 原表存为 screen.tsv.before-rescore，判定有变化的算子逐个打出来。
+RESCORE="${RESCORE:-}"
+if [[ -n "$RESCORE" ]]; then
+  [[ -d "$RESCORE" ]] || { echo "!!! 目录不存在: $RESCORE" >&2; exit 2; }
+  TSV="$RESCORE/screen.tsv"
+  [[ -f "$TSV" ]] || { echo "!!! 没有 screen.tsv: $TSV" >&2; exit 2; }
+  cp "$TSV" "$TSV.before-rescore"
+
+  hdr=$(head -1 "$TSV.before-rescore")
+  # 列名 -> 序号，不写死列序
+  idx() { echo "$hdr" | tr '\t' '\n' | grep -nxF "$1" | cut -d: -f1; }
+  c_op=$(idx op); c_rb=$(idx rows_before); c_ra=$(idx rows_after); c_v=$(idx verdict)
+  [[ -n "$c_op" && -n "$c_v" ]] || { echo "!!! screen.tsv 缺 op/verdict 列" >&2; exit 2; }
+
+  printf '%s\n' "$hdr" > "$TSV"
+  changed=0
+  while IFS= read -r line; do
+    op=$(printf '%s' "$line" | cut -f"$c_op")
+    old=$(printf '%s' "$line" | cut -f"$c_v")
+    rb=$(printf '%s' "$line" | cut -f"${c_rb:-0}"); ra=$(printf '%s' "$line" | cut -f"${c_ra:-0}")
+    fa=$(ir_fingerprint "$RESCORE/${op}_before") || fa=""
+    fb=$(ir_fingerprint "$RESCORE/${op}_after")  || fb=""
+    if [[ "${rb:-0}" == 0 || "${ra:-0}" == 0 ]]; then v=NO_ROWS
+    elif [[ -z "$fa" || -z "$fb" ]]; then v=NO_TRITON
+    elif [[ "$fa" == "$fb" ]]; then v=NO_IR_DIFF
+    else v=IR_CHANGED; fi
+    printf '%s\n' "$line" | awk -v FS='\t' -v OFS='\t' -v i="$c_v" -v v="$v" '{$i=v; print}' >> "$TSV"
+    if [[ "$old" != "$v" ]]; then
+      printf '  %-22s %-12s -> %s\n' "$op" "$old" "$v" >&2
+      changed=$((changed+1))
+    fi
+  done < <(tail -n +2 "$TSV.before-rescore")
+
+  echo ">>> 重打分完成，$changed 个算子的判定变了；原表存为 $TSV.before-rescore"
+  awk -F'\t' 'NR>1{c[$NF]++} END{for (k in c) printf("  %-12s %d\n", k, c[k])}' "$TSV"
+  exit 0
+fi
+
 VENDOR="${VENDOR:-MUSA}"
 ENHANCE_VAR="FLAGTREE_${VENDOR}_RLC_ENHANCE"