boot time analysis script

userspace/usr/comma/tests/analyze-boot-time.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+import subprocess
+from tabulate import tabulate
+
+# serial with timestamps:
+# grabserial -d /dev/serial/by-id/usb-FTDI_FT230X* -t
+
+# systemd-analyze critical-chain weston-ready.service
+# systemd-analyze critical-chain comma.service
+
+if __name__ == "__main__":
+  ts = {
+    # these are dumped over serial, use the ones from the XBL
+    "XBL": 2.4,
+    "ABL": 3.7,  # 3s of this is waiting for fastboot + factory reset tapping
+  }
+
+  out = subprocess.check_output("systemd-analyze", shell=True, encoding='utf8')
+  l = out.splitlines()[0].split(' ')
+  ts['kernel'] = float(l[3][:-1])
+  ts['graphical.target'] = float(l[6][:-1])
+
+  # print
+  tot = 0
+  total = sum(ts.values())
+  tab = []
+  for s, t in ts.items():
+    tot += t
+    tab.append([
+      s,
+      round(t, 2),
+      round(tot, 2),
+      str(round(t/total * 100)) + "%",
+    ])
+  print(tabulate(tab))