cut down router worker threads, receive and send queue concurrent limit

for #1138

Author: snarfed

queue.yaml

@@ -19,15 +19,15 @@ queue:
 
 - name: receive
   rate: 500/s
-  max_concurrent_requests: 160
+  max_concurrent_requests: 100
   retry_parameters:
     task_retry_limit: 2
     min_backoff_seconds: 300
     max_doublings: 2
 
 - name: send
   rate: 500/s
-  max_concurrent_requests: 40
+  max_concurrent_requests: 20
   retry_parameters:
     task_retry_limit: 2
     min_backoff_seconds: 300

router.yaml

@@ -37,4 +37,4 @@ liveness_check:
 # https://cloud.google.com/appengine/docs/flexible/python/runtime#application_startup
 # https://docs.gunicorn.org/en/latest/settings.html
 # TODO: try asyncio w/eventlet workers
-entrypoint: gunicorn --workers 4 --threads 50 -b :$PORT router:app
+entrypoint: gunicorn --workers 4 --threads 30 -b :$PORT router:app