Add a loop timer to help work out where loops are show.

remake/loop_timer.py

@@ -0,0 +1,32 @@
+from collections import defaultdict
+
+import numpy as np
+import pandas as pd
+from tabulate import tabulate
+
+
+class LoopTimer:
+    def __init__(self):
+        self.timers = defaultdict(list)
+        self.last_time = None
+        self.curr_key = None
+
+    def __call__(self, key):
+        time = pd.Timestamp.now()
+        if self.curr_key is not None:
+            self.timers[(self.curr_key, key)].append(time - self.last_time)
+
+        self.last_time = time
+        self.curr_key = key
+
+    def __str__(self):
+        output = []
+
+        for k in self.timers.keys():
+            k1, k2 = k
+            timers = self.timers[k]
+            times_ms = [t.microseconds for t in timers]
+            time_mean_ms = np.mean(times_ms)
+            time_std_ms = np.std(times_ms)
+            output.append((f'{k1} -> {k2}', f'{time_mean_ms / 1e6:.2g}s', f'(+/- {time_std_ms / 1e6:.2g}s)'))
+        return tabulate(output, headers=('tx', 'mean', 'std'))