Enable multi-processing by default.

In realistic production environments, multi-processing is likely
to be enabled.

A default setting of one worker would allow the multi-processing
codepath to be followed by default, without changing the number
of processes actually servicing API requests (i.e. the single
parent process will just wait on the child).

For most functional tests, we continue to explicitly configure
zero workers, so as to avoid spawning twice as many glance-api
processes during a test run.

Change-Id: I1c327805f8fb975a3175e9a8b40aeddd21d5ef91

etc/glance-api.conf

@@ -62,7 +62,7 @@ sql_idle_timeout = 3600
 # may improve performance (especially if using SSL with
 # compression turned on). It is typically recommended to set
 # this value to the number of CPUs present on your machine.
-workers = 0
+workers = 1
 
 # Role used to identify an authenticated user as administrator
 #admin_role = admin

glance/common/wsgi.py

@@ -58,7 +58,7 @@ socket_opts = [
     cfg.StrOpt('key_file'),
 ]
 
-workers_opt = cfg.IntOpt('workers', default=0)
+workers_opt = cfg.IntOpt('workers', default=1)
 
 CONF = cfg.CONF
 CONF.register_opts(bind_opts)

glance/tests/functional/__init__.py

@@ -365,6 +365,7 @@ class RegistryServer(Server):
         self.log_file = os.path.join(self.test_dir, "registry.log")
         self.owner_is_tenant = True
         self.server_control_options = '--capture-output'
+        self.workers = 0
         self.conf_base = """[DEFAULT]
 verbose = %(verbose)s
 debug = %(debug)s
@@ -377,6 +378,7 @@ sql_idle_timeout = 3600
 api_limit_max = 1000
 limit_param_default = 25
 owner_is_tenant = %(owner_is_tenant)s
+workers = %(workers)s
 [paste_deploy]
 flavor = %(deployment_flavor)s
 """