Sync bin/start with metabase-deploy repo

bin/start

@@ -2,6 +2,9 @@
 
 set -e
 
+# NOTE: The canonical source for this file is in the metabase/metabase repository.
+# Please update it there then copy to the metabase/metabase-deploy repository.
+
 # Translate various Heroku environment variables to Metabase equivalents
 
 if [ "$PORT" ]; then
@@ -73,5 +76,21 @@ if [ ! -z "$RDS_HOSTNAME" ]; then
     export MB_DB_PORT=$RDS_PORT
 fi
 
+# Pick sensible memory limits depending on what size Heroku dyno we are on
+limit=$(ulimit -u)
+case $limit in
+512)   # 2X Dyno
+  default_java_mem_opts="-Xmx768m"
+  ;;
+16384) # IX Dyno
+  default_java_mem_opts="-Xmx2g"
+  ;;
+32768) # PX Dyno
+  default_java_mem_opts="-Xmx12g"
+  ;;
+*) #1X Dyno
+  default_java_mem_opts="-Xmx300m -Xss512k"
+  ;;
+esac
 
-exec java $JAVA_OPTS -jar ./target/uberjar/metabase.jar
+exec java $default_java_mem_opts -Dfile.encoding=UTF-8 $JAVA_OPTS -jar ./target/uberjar/metabase.jar