diff --git a/ab_rlc_test.sh b/ab_rlc_test.sh
index 6e8c2ab..e22751a 100644
--- a/ab_rlc_test.sh
+++ b/ab_rlc_test.sh
@@ -45,6 +45,10 @@ ENHANCE_VAR="FLAGTREE_${VENDOR}_RLC_ENHANCE"
 # 空格分隔的算子表。元素为 OP 或 OP:OP_FILE（省略时 OP_FILE=OP）。
 OPS="${OPS:-softmax}"
 
+# 筛选是第一次接触一个算子的地方，最容易撞上挂死的那个。没有上限时一个算子
+# 能把整批停在那里，而筛选的全部意义就是快。
+CELL_TIMEOUT="${CELL_TIMEOUT:-2400}"
+
 if [[ -t 1 && -z "${NO_COLOR:-}" ]]; then
   export FLAGGEMS_PERF_COLOR=always
 fi
@@ -55,8 +59,7 @@ ROOT="runs/ab_rlc_$(date +%Y%m%d-%H%M%S)"
 mkdir -p "$ROOT"
 LOG="$ROOT/summary.log"
 TSV="$ROOT/screen.tsv"
-printf 'op	op_file	dtypes	rows_before	rows_after	kernels_before	kernels_after	cvt_before	cvt_after	verdict
-' > "$TSV"
+printf 'op	op_file	dtypes	rows_before	rows_after	kernels_before	kernels_after	cvt_before	cvt_after	elapsed_before	elapsed_after	verdict\n' > "$TSV"
 
 count_cvt()     { find "$1/ttgir" -name '*.ttgir' -type f -exec cat {} + 2>/dev/null | grep -c convert_layout || true; }
 count_kernels() { find "$1/ttgir" -name '*.ttgir' -type f 2>/dev/null | wc -l; }
@@ -74,14 +77,19 @@ count_rows()    { grep -c '^SUCCESS' "$1/run.log" 2>/dev/null || true; }
     BEFORE="$ROOT/${op}_before"; AFTER="$ROOT/${op}_after"
 
     echo "########## $op | $ENHANCE_VAR=0 before (record) ##########"
+    t0=$(date +%s)
     OP="$op" OP_FILE="$op_file" OUT_DIR="$BEFORE" DTYPES="$dtypes" \
-      env "$ENHANCE_VAR=0" bash run_pytest.sh
-    rc_before=$?
+      timeout -k 30 "$CELL_TIMEOUT" env "$ENHANCE_VAR=0" bash run_pytest.sh
+    rc_before=$?; el_before=$(( $(date +%s) - t0 ))
 
     echo "########## $op | $ENHANCE_VAR=1 after (replay $BEFORE) ##########"
+    t0=$(date +%s)
     OP="$op" OP_FILE="$op_file" OUT_DIR="$AFTER" DTYPES="$dtypes" \
-      REPLAY_FROM="$BEFORE" env "$ENHANCE_VAR=1" bash run_pytest.sh
-    rc_after=$?
+      REPLAY_FROM="$BEFORE" timeout -k 30 "$CELL_TIMEOUT" env "$ENHANCE_VAR=1" bash run_pytest.sh
+    rc_after=$?; el_after=$(( $(date +%s) - t0 ))
+    for rc in "$rc_before" "$rc_after"; do
+      (( rc == 124 || rc == 137 )) && echo "!!! CELL_TIMEOUT ${CELL_TIMEOUT}s op=$op"
+    done
 
     rb=$(count_rows "$BEFORE");     ra=$(count_rows "$AFTER")
     kb=$(count_kernels "$BEFORE");  ka=$(count_kernels "$AFTER")
@@ -91,7 +99,11 @@ count_rows()    { grep -c '^SUCCESS' "$1/run.log" 2>/dev/null || true; }
 
     if (( rc_before != 0 || rc_after != 0 )) || [[ "${rb:-0}" == 0 || "${ra:-0}" == 0 ]]; then
       verdict=NO_ROWS
-      note="跑不出测量行（rc=$rc_before/$rc_after）。看 run.log——多半是 dtype 不被该算子接受，或它在本后端拿不到 config"
+      if (( rc_before == 124 || rc_after == 124 || rc_before == 137 || rc_after == 137 )); then
+        note="超过 CELL_TIMEOUT=${CELL_TIMEOUT}s 被截断（rc=$rc_before/$rc_after）。这是耗时问题，不是对开关的判定——先看它为什么这么慢"
+      else
+        note="跑不出测量行（rc=$rc_before/$rc_after）。看 run.log——多半是 dtype 不被该算子接受，或它在本后端拿不到 config"
+      fi
     elif [[ -z "$fb" || -z "$fa" ]]; then
       verdict=NO_TRITON
       note="跑出了行但没编出 .ttgir：本次运行没有任何东西经过 Triton。算子本身可能完全正常（多半跑的是 aten 或厂商库），只是被测的编译器 pass 没有作用对象。不是'开关无作用'，也不是'没有 kernel'"
@@ -102,9 +114,9 @@ count_rows()    { grep -c '^SUCCESS' "$1/run.log" 2>/dev/null || true; }
       verdict=IR_CHANGED
       note="生成代码有变（cvt ${cb}→${ca}，指纹 ${fb:0:8}/${fa:0:8}）：值得排六轮 A/B"
     fi
-    printf '%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n' \
+    printf '%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n' \
       "$op" "$op_file" "${dtypes:-<all>}" "${rb:-0}" "${ra:-0}" \
-      "$kb" "$ka" "${cb:-0}" "${ca:-0}" "$verdict" >> "$TSV"
+      "$kb" "$ka" "${cb:-0}" "${ca:-0}" "$el_before" "$el_after" "$verdict" >> "$TSV"
     echo ">>> $op: $verdict — $note"
 
     if [[ "$verdict" == NO_ROWS ]]; then
@@ -117,8 +129,8 @@ count_rows()    { grep -c '^SUCCESS' "$1/run.log" 2>/dev/null || true; }
   done
 
   echo "########## 筛选汇总 ##########"
-  awk -F'\t' 'NR>1{printf "  %-12s %-22s cvt %s->%s  kernels %s/%s  rows %s/%s\n", \
-       $10,$1,$8,$9,$6,$7,$4,$5}' "$TSV" | sort
+  awk -F'\t' 'NR>1{printf "  %-12s %-22s cvt %s->%s  kernels %s/%s  rows %s/%s  %ss\n", \
+       $12,$1,$8,$9,$6,$7,$4,$5,$10+$11}' "$TSV" | sort
   echo ">>> 只把 IR_CHANGED 的算子送进 ab_repeat.sh。"
   echo "########## ALL DONE ##########"
 } 2>&1 | tee "$LOG"