Use worker_process auto

frameworks/Ruby/ngx_mruby/nginx.conf

@@ -1,5 +1,6 @@
 pid        /tmp/nginx.pid;
 error_log stderr error;
+worker_processes auto;
 
 events {
     worker_connections  16384;

frameworks/Ruby/ngx_mruby/setup.sh

@@ -3,4 +3,4 @@
 sed -i 's|CWD|'"${TROOT}"'|g' nginx.conf
 sed -i 's|DBHOSTNAME|'"${DBHOST}"'|g' nginx.conf
 
-${IROOT}/nginx_mruby/sbin/nginx -c $TROOT/nginx.conf -g "worker_processes '"${MAX_THREADS}"';" &
+${IROOT}/nginx_mruby/sbin/nginx -c $TROOT/nginx.conf &