Use locks to speed up numpy by preventing thrashing

tangostationcontrol/tangostationcontrol/beam/delays.py

@@ -3,6 +3,7 @@
 
 import datetime
 from functools import lru_cache
+import threading
 from typing import TypedDict
 
 import casacore.measures
@@ -28,6 +29,9 @@ The measures
 # Where to store the measures table sets
 IERS_ROOTDIR = "/opt/IERS"
 
+# Compute lock to prevent thrashing when multithreading
+compute_lock = threading.Lock()
+
 
 def get_IERS_timestamp() -> datetime.datetime:
     """Return the date of the currently installed IERS tables."""
@@ -200,6 +204,7 @@ class Delays:
 
         Returns delays[antenna][direction]."""
 
+        with compute_lock:
             # obtain the direction vector for each pointing
             direction_vectors = self.get_direction_vector_bulk(pointings)