Add CPU util to iperf metrics

ratemon/scripts/tput_rxmits.py → ratemon/scripts/iperf_metrics.py

@@ -10,7 +10,10 @@
 
 def parse_args():
     parser = argparse.ArgumentParser(
-        description="Calculate average throughput and retransmission count"
+        description=(
+            "Parse iperf3 sender JSON log file to determine "
+            "average throughput, retransmission count, and CPU utilization."
+        )
     )
     parser.add_argument(
         "--in-file",
@@ -32,7 +35,17 @@ def main(args):
 
     bps = res["end"]["sum_sent"]["bits_per_second"]
     rxmits = res["end"]["sum_sent"]["retransmits"]
-    msg = f"Throughput: {bps / 1e9:.2f} Gbps\nRetransmits: {rxmits}"
+    cpu_total = res["end"]["cpu_utilization_percent"]["host_total"]
+    cpu_user = res["end"]["cpu_utilization_percent"]["host_user"]
+    cpu_system = res["end"]["cpu_utilization_percent"]["host_system"]
+
+    msg = (
+        f"throughput (Gbps):{bps / 1e9:.2f}\n"
+        f"retransmits (total):{rxmits}\n"
+        f"cpu total (%):{cpu_total:.2f}\n"
+        f"cpu user (%):{cpu_user:.2f}\n"
+        f"cpu system (%):{cpu_system:.2f}"
+    )
     print(msg)
     with open(args.out_file, "w", encoding="utf-8") as fil:
         fil.write(msg)