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Merge pull request #2868 from takluyver/import-performance...
Merge pull request #2868 from takluyver/import-performance Import performance Defer various imports for a small reduction in startup time. IPython.lib.__init__ previously loaded IPython.lib.inputhook to export some of its functions. This meant that importing anything from IPython.lib also loaded inputhook. For now, I've just removed that import, but that is an API change, because the functions are no longer accessible as e.g. IPython.lib.enable_qt4 Added a note about the API change. Timing command, borrowed from Openoffice to simulate cold start: $ sync ; echo 3 | sudo tee /proc/sys/vm/drop_caches; time ipython3 -c pass Results with this branch: 7.68, 7.64, 7.35, 7.38 s 'real' Results with master: 8.17, 8.04, 7.81, 7.77

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test_compilerop.py
75 lines | 2.3 KiB | text/x-python | PythonLexer
# coding: utf-8
"""Tests for the compilerop module.
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2010-2011 The IPython Development Team.
#
# Distributed under the terms of the BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from __future__ import print_function
# Stdlib imports
import linecache
import sys
# Third-party imports
import nose.tools as nt
# Our own imports
from IPython.core import compilerop
from IPython.utils import py3compat
#-----------------------------------------------------------------------------
# Test functions
#-----------------------------------------------------------------------------
def test_code_name():
code = 'x=1'
name = compilerop.code_name(code)
nt.assert_true(name.startswith('<ipython-input-0'))
def test_code_name2():
code = 'x=1'
name = compilerop.code_name(code, 9)
nt.assert_true(name.startswith('<ipython-input-9'))
def test_cache():
"""Test the compiler correctly compiles and caches inputs
"""
cp = compilerop.CachingCompiler()
ncache = len(linecache.cache)
cp.cache('x=1')
nt.assert_true(len(linecache.cache) > ncache)
def setUp():
# Check we're in a proper Python 2 environment (some imports, such
# as GTK, can change the default encoding, which can hide bugs.)
nt.assert_equal(sys.getdefaultencoding(), "utf-8" if py3compat.PY3 else "ascii")
def test_cache_unicode():
cp = compilerop.CachingCompiler()
ncache = len(linecache.cache)
cp.cache(u"t = 'žćčšđ'")
nt.assert_true(len(linecache.cache) > ncache)
def test_compiler_check_cache():
"""Test the compiler properly manages the cache.
"""
# Rather simple-minded tests that just exercise the API
cp = compilerop.CachingCompiler()
cp.cache('x=1', 99)
# Ensure now that after clearing the cache, our entries survive
linecache.checkcache()
for k in linecache.cache:
if k.startswith('<ipython-input-99'):
break
else:
raise AssertionError('Entry for input-99 missing from linecache')