add preload_app setting

gunicorn/arbiter.py

@@ -46,7 +46,11 @@ class Arbiter(object):
     
     def __init__(self, app):
         self.cfg = app.cfg
-        self.app = app.load()
+        
+        if self.cfg.preload_app:
+            self.app = app.load()
+        else:
+            self.app = app
 
         self.log = logging.getLogger(__name__)
 

gunicorn/config.py

@@ -522,3 +522,13 @@ with Setting("pre_exec") as s:
         
         The callable needs to accept a single instance variable for the Arbiter.
         """)
+
+with Setting("preload_app") as s:
+    s.section = "Server Mechanic"
+    s.cli = ["--preload"]
+    s.validator = validate_bool
+    s.action = "store_true"
+    s.default = False
+    s.fmt_desc("""\
+        Enabling this preloads an application before forking worker processes.    
+        """)

gunicorn/workers/base.py

@@ -33,7 +33,9 @@ class Worker(object):
         self.app = app
         self.timeout = timeout
         self.cfg = cfg
-
+        if not self.cfg.preload_app:
+            self.app = app.load()
+        
         self.nr = 0
         self.alive = True
         self.spinner = 0