diff --git a/perf/ipc_diff_pro.py b/perf/ipc_diff_pro.py
new file mode 100644
index 00000000..b038b549
--- /dev/null
+++ b/perf/ipc_diff_pro.py
@@ -0,0 +1,159 @@
+#!/usr/bin/env python3
+
+'''
+Author: Yanqin Li <liyanqin@bosc.ac.cn>
+
+Usage:
+    python3 ipc_diff_pro.py checkpoint.json base=/path/to/spec_dir new=/path/to/spec_dir -o ipc-compare.csv -j $(nproc)
+
+Notes:
+    The first SPEC directory is treated as the baseline.
+    Additional SPEC directories are compared against that baseline.
+'''
+
+import argparse
+import csv
+import json
+import os
+import queue
+import sys
+from multiprocessing import Process, Queue
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from perf import PerfCounters
+
+
+def load_ckpt_list(json_path):
+    with open(json_path, "r") as f:
+        data = json.load(f)
+    ckpts = []
+    for bench_name, info in data.items():
+        for point, weight in info["points"].items():
+            ckpts.append((bench_name, point, str(weight)))
+    return ckpts
+
+
+def read_ipc(sim_err_path):
+    if not os.path.isfile(sim_err_path):
+        return None
+    counters = PerfCounters(sim_err_path)
+    cycle = counters["clock_cycle"]
+    instr = counters["commitInstr"]
+    if cycle is None or instr is None:
+        return None
+    try:
+        cycle = float(cycle)
+        instr = float(instr)
+        return instr / cycle if cycle != 0 else None
+    except Exception:
+        return None
+
+
+def worker(task_q, result_q):
+    while True:
+        try:
+            ckpt, sim_err = task_q.get_nowait()
+        except queue.Empty:
+            break
+        result_q.put((ckpt, read_ipc(sim_err)))
+
+
+def collect_ipc(spec_dir, json_path, jobs):
+    ckpts = load_ckpt_list(json_path)
+    task_q = Queue()
+    result_q = Queue()
+    for bench_name, point, weight in ckpts:
+        ckpt = "_".join([bench_name, point, weight])
+        sim_err = os.path.join(spec_dir, ckpt, "simulator_err.txt")
+        task_q.put((ckpt, sim_err))
+
+    procs = []
+    for _ in range(jobs):
+        p = Process(target=worker, args=(task_q, result_q))
+        p.start()
+        procs.append(p)
+    for p in procs:
+        p.join()
+
+    ipc_map = {}
+    for _ in range(len(ckpts)):
+        ckpt, ipc = result_q.get()
+        ipc_map[ckpt] = ipc
+    return ipc_map
+
+
+def parse_spec_dir_arg(arg):
+    parts = arg.split("=", 1)
+    if len(parts) != 2:
+        raise ValueError("SPEC_DIR must be in name=path format")
+    return parts[0], parts[1]
+
+
+def compute_rates(row, base_idx=0):
+    base = row[base_idx]
+    rates = []
+    for v in row[base_idx + 1:]:
+        if base is None or v is None or base == 0:
+            rates.append(None)
+        else:
+            rates.append((v / base - 1) * 100)
+    return rates
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Compare IPC across SPEC dirs")
+    parser.add_argument("json_path", help="checkpoint json path")
+    parser.add_argument("spec_dirs", nargs="+", help="name=SPEC_DIR, multiple")
+    parser.add_argument("-o", "--output", default="ipc-compare.csv")
+    parser.add_argument("-j", "--jobs", type=int, default=os.cpu_count() or 1)
+    args = parser.parse_args()
+
+    print("out path of IPC compare:", os.path.abspath(args.output))
+    named_dirs = [parse_spec_dir_arg(x) for x in args.spec_dirs]
+    ipc_by_dir = []
+    for name, path in named_dirs:
+        ipc_by_dir.append((name, path, collect_ipc(path, args.json_path, args.jobs)))
+
+    all_ckpts = sorted(set().union(*[set(m.keys()) for _, _, m in ipc_by_dir]))
+
+    rows = []
+    for ckpt in all_ckpts:
+        ipcs = [m.get(ckpt) for _, _, m in ipc_by_dir]
+        rates = compute_rates(ipcs, 0)
+        rows.append((ckpt, ipcs, rates))
+
+    def sort_key(item):
+        rates = item[2]
+        if not rates or rates[0] is None:
+            return -1
+        return abs(rates[0])
+
+    rows.sort(key=sort_key, reverse=True)
+
+    header = ["ckpt"] + [name for name, _, _ in ipc_by_dir]
+    if len(ipc_by_dir) > 1:
+        base_name = ipc_by_dir[0][0]
+        header += [f"pct {name}/{base_name}" for name, _, _ in ipc_by_dir[1:]]
+
+    with open(args.output, "w", newline="") as f:
+        writer = csv.writer(f)
+        writer.writerow(header)
+        writer.writerow(["path"] + [path for _, path, _ in ipc_by_dir])
+        for ckpt, ipcs, rates in rows:
+            row = [ckpt] + ipcs
+            if len(ipc_by_dir) > 1:
+                row += rates
+            writer.writerow(row)
+
+    top_n = 3 if len(rows) >= 3 else len(rows)
+    if top_n > 0:
+        print("\nTop log files:")
+        for ckpt, _, _ in rows[:top_n]:
+            print(f"{ckpt}:")
+            for _, path, _ in ipc_by_dir:
+                print(os.path.join(path, ckpt, "simulator_err.txt"))
+            print()
+
+
+if __name__ == "__main__":
+    main()