diff --git a/tools/x264_perf_O3.py b/tools/x264_perf_O3.py
new file mode 100644
index 0000000..d4e7fe4
--- /dev/null
+++ b/tools/x264_perf_O3.py
@@ -0,0 +1,35 @@
+from pathlib import Path
+from subprocess import run
+
+from speccpu import get_benchspec_dir, x264
+from speccpu.flaglib.perf import record as recordflags
+
+
+def main():
+    x264_run_id = "c56635a4-9f49-4d2b-be79-38d9e08097c5"
+    x264_outputroot = Path("/home/lyc/work-ts/local/specOutput") / x264_run_id
+
+
+    x264_dir = get_benchspec_dir(x264_outputroot) / "625.x264_s"
+
+    x264_run = x264_dir / "run" / "run_base_refspeed_mytest-m64.0000"
+
+
+    run(
+        [
+            "perf",
+            "record",
+            *recordflags(
+                [
+                    str(x264_run / "x264_s_base.mytest-m64"),
+                    *x264.specinvoke_args["ref"],
+                ],
+                output=str(Path.cwd() / f"x264-{x264_run_id}perf"),
+            ),
+        ],
+        check=True,
+        cwd=x264_run,
+    )
+
+if __name__ == "__main__":
+    main()