+ for group in assignments.get_groups():
+ users_in_group = assignments.users_in_group(group)
+ if len(users_in_group) == 0:
+ continue
+
+ # Split up the users into chunks, so we write no more than 1K at a
+ # time. (Minimizing the DB modifies is more efficient, but writing
+ # 10K+ users to a single group becomes inefficient memory-wise)
+ for chunk in range(0, len(users_in_group), 1000):
+ chunk_of_users = users_in_group[chunk:chunk + 1000]
+ add_group_members(db, instance_id, group, chunk_of_users)
+
+
+def add_group_members(db, instance_id, group, users_in_group):
+ """Adds the given users to group specified."""
+
+ start = time.time()