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befe7ffcb8a4f81159408d3dcd3e93aeebf134fa
sqlalchemy/test/aaa_profiling/test_orm.py
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Mike Bayer fe1cabb88a Performance within instances() 
Continuing from Ie43beecf37945b2bb7fff0aaa597a597293daa18,
also observed is the overhead of PathRegsitry memoized token
functions, as these paths are not cached in the case of
long joinedloader chains.  The memoizations here were made
with short paths in mind, and have been replaced with
an inlined straight create of these paths up front, producing
callcounts very similar to 0.8. Combined with the previous
optimizations, 1.1 now runs the "joined eager load of one row"
worst case test in about 40% fewer calls than 0.8 and 60%
fewer than 1.1.5.

Change-Id: Ib5e1c1345a1dd8edfbdb3fed06eb717d4e164d31
Fixes: #3915
2017-02-23 16:56:20 -05:00

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from sqlalchemy import Integer, String, ForeignKey
from sqlalchemy.orm import mapper, relationship, \
sessionmaker, Session, defer, joinedload, defaultload
from sqlalchemy import testing
from sqlalchemy.testing import profiling
from sqlalchemy.testing import fixtures
from sqlalchemy.testing.schema import Table, Column
class MergeTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
'parent',
metadata,
Column(
'id',
Integer,
primary_key=True,
test_needs_autoincrement=True),
Column(
'data',
String(20)))
Table(
'child', metadata,
Column(
'id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column(
'data', String(20)),
Column(
'parent_id', Integer, ForeignKey('parent.id'), nullable=False))
@classmethod
def setup_classes(cls):
class Parent(cls.Basic):
pass
class Child(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
Child, Parent, parent, child = (cls.classes.Child,
cls.classes.Parent,
cls.tables.parent,
cls.tables.child)
mapper(
Parent,
parent,
properties={
'children': relationship(
Child,
backref='parent')})
mapper(Child, child)
@classmethod
def insert_data(cls):
parent, child = cls.tables.parent, cls.tables.child
parent.insert().execute({'id': 1, 'data': 'p1'})
child.insert().execute({'id': 1, 'data': 'p1c1', 'parent_id': 1})
def test_merge_no_load(self):
Parent = self.classes.Parent
sess = sessionmaker()()
sess2 = sessionmaker()()
p1 = sess.query(Parent).get(1)
p1.children
# down from 185 on this this is a small slice of a usually
# bigger operation so using a small variance
@profiling.function_call_count(variance=0.10)
def go1():
return sess2.merge(p1, load=False)
p2 = go1()
# third call, merge object already present. almost no calls.
@profiling.function_call_count(variance=0.10)
def go2():
return sess2.merge(p2, load=False)
go2()
def test_merge_load(self):
Parent = self.classes.Parent
sess = sessionmaker()()
sess2 = sessionmaker()()
p1 = sess.query(Parent).get(1)
p1.children
# preloading of collection took this down from 1728 to 1192
# using sqlite3 the C extension took it back up to approx. 1257
# (py2.6)
@profiling.function_call_count()
def go():
sess2.merge(p1)
go()
# one more time, count the SQL
def go2():
sess2.merge(p1)
sess2 = sessionmaker(testing.db)()
self.assert_sql_count(testing.db, go2, 2)
class LoadManyToOneFromIdentityTest(fixtures.MappedTest):
"""test overhead associated with many-to-one fetches.
Prior to the refactor of LoadLazyAttribute and
query._get(), the load from identity map took 2x
as many calls (65K calls here instead of around 33K)
to load 1000 related objects from the identity map.
"""
@classmethod
def define_tables(cls, metadata):
Table('parent', metadata,
Column('id', Integer, primary_key=True),
Column('data', String(20)),
Column('child_id', Integer, ForeignKey('child.id'))
)
Table('child', metadata,
Column('id', Integer, primary_key=True),
Column('data', String(20))
)
@classmethod
def setup_classes(cls):
class Parent(cls.Basic):
pass
class Child(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
Child, Parent, parent, child = (cls.classes.Child,
cls.classes.Parent,
cls.tables.parent,
cls.tables.child)
mapper(Parent, parent, properties={
'child': relationship(Child)})
mapper(Child, child)
@classmethod
def insert_data(cls):
parent, child = cls.tables.parent, cls.tables.child
child.insert().execute([
{'id': i, 'data': 'c%d' % i}
for i in range(1, 251)
])
parent.insert().execute([
{
'id': i,
'data': 'p%dc%d' % (i, (i % 250) + 1),
'child_id': (i % 250) + 1
}
for i in range(1, 1000)
])
def test_many_to_one_load_no_identity(self):
Parent = self.classes.Parent
sess = Session()
parents = sess.query(Parent).all()
@profiling.function_call_count(variance=.2)
def go():
for p in parents:
p.child
go()
def test_many_to_one_load_identity(self):
Parent, Child = self.classes.Parent, self.classes.Child
sess = Session()
parents = sess.query(Parent).all()
children = sess.query(Child).all()
children # strong reference
@profiling.function_call_count()
def go():
for p in parents:
p.child
go()
class MergeBackrefsTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table('a', metadata,
Column('id', Integer, primary_key=True),
Column('c_id', Integer, ForeignKey('c.id'))
)
Table('b', metadata,
Column('id', Integer, primary_key=True),
Column('a_id', Integer, ForeignKey('a.id'))
)
Table('c', metadata,
Column('id', Integer, primary_key=True),
)
Table('d', metadata,
Column('id', Integer, primary_key=True),
Column('a_id', Integer, ForeignKey('a.id'))
)
@classmethod
def setup_classes(cls):
class A(cls.Basic):
pass
class B(cls.Basic):
pass
class C(cls.Basic):
pass
class D(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
A, B, C, D = cls.classes.A, cls.classes.B, \
cls.classes.C, cls.classes.D
a, b, c, d = cls.tables.a, cls.tables.b, \
cls.tables.c, cls.tables.d
mapper(A, a, properties={
'bs': relationship(B, backref='a'),
'c': relationship(C, backref='as'),
'ds': relationship(D, backref='a'),
})
mapper(B, b)
mapper(C, c)
mapper(D, d)
@classmethod
def insert_data(cls):
A, B, C, D = cls.classes.A, cls.classes.B, \
cls.classes.C, cls.classes.D
s = Session()
s.add_all([
A(id=i,
bs=[B(id=(i * 5) + j) for j in range(1, 5)],
c=C(id=i),
ds=[D(id=(i * 5) + j) for j in range(1, 5)]
)
for i in range(1, 5)
])
s.commit()
@profiling.function_call_count(variance=.10)
def test_merge_pending_with_all_pks(self):
A, B, C, D = self.classes.A, self.classes.B, \
self.classes.C, self.classes.D
s = Session()
for a in [
A(id=i,
bs=[B(id=(i * 5) + j) for j in range(1, 5)],
c=C(id=i),
ds=[D(id=(i * 5) + j) for j in range(1, 5)]
)
for i in range(1, 5)
]:
s.merge(a)
class DeferOptionsTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table('a', metadata,
Column('id', Integer, primary_key=True),
Column('x', String(5)),
Column('y', String(5)),
Column('z', String(5)),
Column('q', String(5)),
Column('p', String(5)),
Column('r', String(5)),
)
@classmethod
def setup_classes(cls):
class A(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
A = cls.classes.A
a = cls.tables.a
mapper(A, a)
@classmethod
def insert_data(cls):
A = cls.classes.A
s = Session()
s.add_all([
A(id=i,
**dict((letter, "%s%d" % (letter, i)) for letter in
['x', 'y', 'z', 'p', 'q', 'r'])
) for i in range(1, 1001)
])
s.commit()
@profiling.function_call_count(variance=.10)
def test_baseline(self):
# as of [ticket:2778], this is at 39025
A = self.classes.A
s = Session()
s.query(A).all()
@profiling.function_call_count(variance=.10)
def test_defer_many_cols(self):
# with [ticket:2778], this goes from 50805 to 32817,
# as it should be fewer function calls than the baseline
A = self.classes.A
s = Session()
s.query(A).options(
*[defer(letter) for letter in ['x', 'y', 'z', 'p', 'q', 'r']]).\
all()
class AttributeOverheadTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
'parent',
metadata,
Column(
'id',
Integer,
primary_key=True,
test_needs_autoincrement=True),
Column(
'data',
String(20)))
Table(
'child', metadata,
Column(
'id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column(
'data', String(20)), Column(
'parent_id', Integer, ForeignKey('parent.id'), nullable=False))
@classmethod
def setup_classes(cls):
class Parent(cls.Basic):
pass
class Child(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
Child, Parent, parent, child = (cls.classes.Child,
cls.classes.Parent,
cls.tables.parent,
cls.tables.child)
mapper(
Parent,
parent,
properties={
'children': relationship(
Child,
backref='parent')})
mapper(Child, child)
def test_attribute_set(self):
Parent, Child = self.classes.Parent, self.classes.Child
p1 = Parent()
c1 = Child()
@profiling.function_call_count()
def go():
for i in range(30):
c1.parent = p1
c1.parent = None
c1.parent = p1
del c1.parent
go()
def test_collection_append_remove(self):
Parent, Child = self.classes.Parent, self.classes.Child
p1 = Parent()
children = [Child() for i in range(100)]
@profiling.function_call_count()
def go():
for child in children:
p1.children.append(child)
for child in children:
p1.children.remove(child)
go()
class SessionTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
'parent',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('data', String(20)))
Table(
'child', metadata,
Column('id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column(
'data', String(20)), Column(
'parent_id', Integer, ForeignKey('parent.id'), nullable=False))
@classmethod
def setup_classes(cls):
class Parent(cls.Basic):
pass
class Child(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
Child, Parent, parent, child = (cls.classes.Child,
cls.classes.Parent,
cls.tables.parent,
cls.tables.child)
mapper(
Parent, parent, properties={
'children': relationship(
Child,
backref='parent')})
mapper(Child, child)
def test_expire_lots(self):
Parent, Child = self.classes.Parent, self.classes.Child
obj = [Parent(
children=[Child() for j in range(10)]) for i in range(10)]
sess = Session()
sess.add_all(obj)
sess.flush()
@profiling.function_call_count()
def go():
sess.expire_all()
go()
class QueryTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
'parent',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('data1', String(20)),
Column('data2', String(20)),
Column('data3', String(20)),
Column('data4', String(20)),
)
@classmethod
def setup_classes(cls):
class Parent(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
Parent = cls.classes.Parent
parent = cls.tables.parent
mapper(Parent, parent)
def _fixture(self):
Parent = self.classes.Parent
sess = Session()
sess.add_all([
Parent(data1='d1', data2='d2', data3='d3', data4='d4')
for i in range(10)
])
sess.commit()
sess.close()
def test_query_cols(self):
Parent = self.classes.Parent
self._fixture()
sess = Session()
@profiling.function_call_count()
def go():
for i in range(10):
q = sess.query(
Parent.data1, Parent.data2, Parent.data3, Parent.data4
)
q.all()
go()
class JoinedEagerLoadTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
def make_some_columns():
return [
Column('c%d' % i, Integer)
for i in range(10)
]
Table(
'a',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
*make_some_columns()
)
Table(
'b',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('a_id', ForeignKey('a.id')),
*make_some_columns()
)
Table(
'c',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('b_id', ForeignKey('b.id')),
*make_some_columns()
)
Table(
'd',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('c_id', ForeignKey('c.id')),
*make_some_columns()
)
Table(
'e',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('a_id', ForeignKey('a.id')),
*make_some_columns()
)
Table(
'f',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('e_id', ForeignKey('e.id')),
*make_some_columns()
)
Table(
'g',
metadata,
Column('id', Integer,
primary_key=True, test_needs_autoincrement=True),
Column('e_id', ForeignKey('e.id')),
*make_some_columns()
)
@classmethod
def setup_classes(cls):
class A(cls.Basic):
pass
class B(cls.Basic):
pass
class C(cls.Basic):
pass
class D(cls.Basic):
pass
class E(cls.Basic):
pass
class F(cls.Basic):
pass
class G(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
A, B, C, D, E, F, G = cls.classes('A', 'B', 'C', 'D', 'E', 'F', 'G')
a, b, c, d, e, f, g = cls.tables('a', 'b', 'c', 'd', 'e', 'f', 'g')
mapper(A, a, properties={
'bs': relationship(B),
'es': relationship(E)
})
mapper(B, b, properties={
'cs': relationship(C)
})
mapper(C, c, properties={
'ds': relationship(D)
})
mapper(D, d)
mapper(E, e, properties={
'fs': relationship(F),
'gs': relationship(G)
})
mapper(F, f)
mapper(G, g)
@classmethod
def insert_data(cls):
A, B, C, D, E, F, G = cls.classes('A', 'B', 'C', 'D', 'E', 'F', 'G')
s = Session()
s.add(
A(
bs=[B(cs=[C(ds=[D()])]), B(cs=[C()])],
es=[E(fs=[F()], gs=[G()])]
)
)
s.commit()
def test_build_query(self):
A, B, C, D, E, F, G = self.classes('A', 'B', 'C', 'D', 'E', 'F', 'G')
sess = Session()
@profiling.function_call_count()
def go():
for i in range(100):
q = sess.query(A).options(
joinedload(A.bs).joinedload(B.cs).joinedload(C.ds),
joinedload(A.es).joinedload(E.fs),
defaultload(A.es).joinedload(E.gs),
)
q._compile_context()
go()
def test_fetch_results(self):
A, B, C, D, E, F, G = self.classes('A', 'B', 'C', 'D', 'E', 'F', 'G')
sess = Session()
q = sess.query(A).options(
joinedload(A.bs).joinedload(B.cs).joinedload(C.ds),
joinedload(A.es).joinedload(E.fs),
defaultload(A.es).joinedload(E.gs),
)
context = q._compile_context()
@profiling.function_call_count()
def go():
for i in range(100):
obj = q._execute_and_instances(context)
list(obj)
sess.close()
go()
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