Fix perf issue where main event loop takes 100% of CPU

We have a 2 threads:
Thread #1 runs in a loop polling the response queue
Thread #2 runs in a loop decoding responses from the sqltoolsservice over stdout and posting them to the response queue

Since thread #1 doesn't sleep, it's takes 100% CPU. In addition, running python 2.7 on windows, #2 doesn’t preempt the CPU due to #1 taking all of the CPU cycles, so no response is processed.

Fix is simple – thread #1 needs to sleep so thread #2 can get scheduled and get it’s work done.

Author: pensivebrian

mssqlscripter/main.py

@@ -86,8 +86,9 @@ def main(args):
         scripting_request.execute()
 
         while not scripting_request.completed():
+            # The sleep prevents burning up the CPU and lets other threads get scheduled.
+            time.sleep(0.1) 
             response = scripting_request.get_response()
-
             if response:
                 scriptercallbacks.handle_response(response, parameters.DisplayProgress)