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# Copyright (C) 2006, 2008, 2009, 2010 by Canonical Ltd
# Written by John Arbash Meinel <john@arbash-meinel.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""A custom importer and regex compiler which logs time spent."""
import sys
import time
import re
_parent_stack = []
_total_stack = {}
_info = {}
_cur_id = 0
_timer = time.time
if sys.platform == 'win32':
_timer = time.clock
def stack_add(name, frame_name, frame_lineno, scope_name=None):
"""Start a new record on the stack"""
global _cur_id
_cur_id += 1
this_stack = (_cur_id, name)
if _parent_stack:
_total_stack[_parent_stack[-1]].append(this_stack)
_total_stack[this_stack] = []
_parent_stack.append(this_stack)
_info[this_stack] = [len(_parent_stack)-1, frame_name, frame_lineno, scope_name]
return this_stack
def stack_finish(this, cost):
"""Finish a given entry, and record its cost in time"""
global _parent_stack
assert _parent_stack[-1] == this, \
'import stack does not end with this %s: %s' % (this, _parent_stack)
_parent_stack.pop()
_info[this].append(cost)
def log_stack_info(out_file, sorted=True, hide_fast=True):
# Find all of the roots with import = 0
out_file.write('%5s %5s %-40s @ %s:%s\n'
% ('cum', 'inline', 'name', 'file', 'line'))
todo = [(value[-1], key) for key,value in _info.iteritems() if value[0] == 0]
if sorted:
todo.sort()
while todo:
cum_time, cur = todo.pop()
children = _total_stack[cur]
c_times = []
info = _info[cur]
if hide_fast and info[-1] < 0.0001:
continue
# Compute the module time by removing the children times
mod_time = info[-1]
for child in children:
c_info = _info[child]
mod_time -= c_info[-1]
c_times.append((c_info[-1], child))
# indent, cum_time, mod_time, name,
# scope_name, frame_name, frame_lineno
out_file.write('%5.1f %5.1f %-40s @ %s:%d\n'
% (info[-1]*1000., mod_time*1000.,
('+'*info[0] + cur[1]),
info[1], info[2]))
if sorted:
c_times.sort()
else:
c_times.reverse()
todo.extend(c_times)
_real_import = __import__
def timed_import(name, globals=None, locals=None, fromlist=None, level=None):
"""Wrap around standard importer to log import time"""
# normally there are 4, but if this is called as __import__ eg by
# /usr/lib/python2.6/email/__init__.py then there may be only one
# parameter
# level is only passed by python2.6
if globals is None:
# can't determine the scope name afaics; we could peek up the stack to
# see where this is being called from, but it should be a rare case.
scope_name = None
else:
scope_name = globals.get('__name__', None)
if scope_name is None:
scope_name = globals.get('__file__', None)
if scope_name is None:
scope_name = globals.keys()
else:
# Trim out paths before bzrlib
loc = scope_name.find('bzrlib')
if loc != -1:
scope_name = scope_name[loc:]
# For stdlib, trim out early paths
loc = scope_name.find('python2.4')
if loc != -1:
scope_name = scope_name[loc:]
# Figure out the frame that is doing the importing
frame = sys._getframe(1)
frame_name = frame.f_globals.get('__name__', '<unknown>')
extra = ''
if frame_name.endswith('demandload'):
# If this was demandloaded, we have 3 frames to ignore
extra = '(demandload) '
frame = sys._getframe(4)
frame_name = frame.f_globals.get('__name__', '<unknown>')
elif frame_name.endswith('lazy_import'):
# If this was lazily imported, we have 3 frames to ignore
extra = '[l] '
frame = sys._getframe(4)
frame_name = frame.f_globals.get('__name__', '<unknown>')
if fromlist:
extra += ' [%s]' % (', '.join(map(str, fromlist)),)
frame_lineno = frame.f_lineno
this = stack_add(extra + name, frame_name, frame_lineno, scope_name)
tstart = _timer()
try:
# Do the import
mod = _real_import(name, globals, locals, fromlist)
finally:
tload = _timer()-tstart
stack_finish(this, tload)
return mod
_real_compile = re._compile
def timed_compile(*args, **kwargs):
"""Log how long it takes to compile a regex"""
# And who is requesting this?
frame = sys._getframe(2)
frame_name = frame.f_globals.get('__name__', '<unknown>')
extra = ''
if frame_name.endswith('lazy_regex'):
# If this was lazily compiled, we have 3 more frames to ignore
extra = '[l] '
frame = sys._getframe(5)
frame_name = frame.f_globals.get('__name__', '<unknown>')
frame_lineno = frame.f_lineno
this = stack_add(extra+repr(args[0]), frame_name, frame_lineno)
tstart = _timer()
try:
# Measure the compile time
comp = _real_compile(*args, **kwargs)
finally:
tcompile = _timer() - tstart
stack_finish(this, tcompile)
return comp
def install():
"""Install the hooks for measuring import and regex compile time."""
__builtins__['__import__'] = timed_import
re._compile = timed_compile
def uninstall():
"""Remove the import and regex compile timing hooks."""
__builtins__['__import__'] = _real_import
re._compile = _real_compile
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