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Performance optimization in resolving host patterns

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Avoid resolving a pattern that is a plain host. When matching a hostname in the
hosts_cache, just use the host object from there.

When running a task on say 750 hosts, this yields a huge improvement.
This commit is contained in:
Serge van Ginderachter
2014-03-26 16:24:54 +01:00
committed by James Cammarata
parent 539426f612
commit ff4119adc0
1 changed files with 11 additions and 8 deletions
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19
lib/ansible/inventory/__init__.py
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@@ -213,15 +213,18 @@ class Inventory(object):
hosts = []
for p in patterns:
that = self.__get_hosts(p)
if p.startswith("!"):
hosts = [ h for h in hosts if h not in that ]
elif p.startswith("&"):
hosts = [ h for h in hosts if h in that ]
# avoid resolving a pattern that is a plain host
if p in self._hosts_cache:
hosts.append(self.get_host(p))
else:
to_append = [ h for h in that if h.name not in [ y.name for y in hosts ] ]
hosts.extend(to_append)
that = self.__get_hosts(p)
if p.startswith("!"):
hosts = [ h for h in hosts if h not in that ]
elif p.startswith("&"):
hosts = [ h for h in hosts if h in that ]
else:
to_append = [ h for h in that if h.name not in [ y.name for y in hosts ] ]
hosts.extend(to_append)
return hosts
def __get_hosts(self, pattern):