Use time.perf_counter() for cache time measurement

See https://twitter.com/raymondh/status/1275937373080023040

Change-Id: Iaa0abb0c433ccedfbd88d00e3970120242ba379b

2 files changed, 3 insertions, 0 deletions

diff --git a/lib/sqlalchemy/util/__init__.py b/lib/sqlalchemy/util/__init__.py
index 273570357..fb90975a1 100644
--- a/lib/sqlalchemy/util/__init__.py
+++ b/lib/sqlalchemy/util/__init__.py
@@ -61,6 +61,7 @@ from .compat import itertools_filterfalse  # noqa
 from .compat import namedtuple  # noqa
 from .compat import next  # noqa
 from .compat import parse_qsl  # noqa
+from .compat import perf_counter  # noqa
 from .compat import pickle  # noqa
 from .compat import print_  # noqa
 from .compat import py2k  # noqa
diff --git a/lib/sqlalchemy/util/compat.py b/lib/sqlalchemy/util/compat.py
index 5c46395f9..806ef8ae1 100644
--- a/lib/sqlalchemy/util/compat.py
+++ b/lib/sqlalchemy/util/compat.py
@@ -99,6 +99,7 @@ if py3k:
     from io import BytesIO as byte_buffer
     from io import StringIO
     from itertools import zip_longest
+    from time import perf_counter
     from urllib.parse import (
         quote_plus,
         unquote_plus,
@@ -192,6 +193,7 @@ else:
     from StringIO import StringIO  # noqa
     from cStringIO import StringIO as byte_buffer  # noqa
     from itertools import izip_longest as zip_longest  # noqa
+    from time import clock as perf_counter  # noqa
     from urllib import quote  # noqa
     from urllib import quote_plus  # noqa
     from urllib import unquote  # noqa