Less gunicorn workers for less RAM usage

Settings the number of workers for the LMS and the CMS to 2*|CPU|+1
results in 4*|CPU]+2 gunicorn workers, which is too much for a laptop to
cope with.

Close #207

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.3.8 (2019-04-28)
+
+- [Bugfix] Reduce the number of gunicorn workers to address RAM usage (#207)
+
 ## 3.3.7 (2019-04-28)
 
 - [Bugfix] Fix "Timeout after 20s" on running migrations

tutor/templates/build/openedx/gunicorn_conf.py

@@ -1,5 +1,4 @@
 import multiprocessing
 
-# The recommended number of workers is twice the
-# CPU count plus one
-workers = (multiprocessing.cpu_count() * 2) + 1
+# Set the number of gunicorn workers to the number of CPU
+workers = multiprocessing.cpu_count()