Mercurial > hg
view tests/test-demandimport.py @ 44363:f7459da77f23
nodemap: introduce an option to use mmap to read the nodemap mapping
The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.
This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).
Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:
Before:
* do not use the persistent nodemap
* use the CPython implementation of the index for nodemap
* use mmapping of the changelog index
After:
* use the MixedIndex Rust code, with the NodeTree object for nodemap access
(still in review)
* use the persistent nodemap data from disk
* access the persistent nodemap data through mmap
* use mmapping of the changelog index
The persistent nodemap greatly speed up most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.
Here are some numbers (in seconds) for the reference copy of mozilla-try:
Revset Before After abs-change speedup
-10000: 0.004622 0.005532 0.000910 × 0.83
-10: 0.000050 0.000132 0.000082 × 0.37
tip 0.000052 0.000085 0.000033 × 0.61
0 + (-10000:) 0.028222 0.005337 -0.022885 × 5.29
0 0.023521 0.000084 -0.023437 × 280.01
(-10000:) + 0 0.235539 0.005308 -0.230231 × 44.37
(-10:) + :9 0.232883 0.000180 -0.232703 ×1293.79
(-10000:) + (:99) 0.238735 0.005358 -0.233377 × 44.55
:99 + (-10000:) 0.317942 0.005593 -0.312349 × 56.84
:9 + (-10:) 0.313372 0.000179 -0.313193 ×1750.68
:9 0.316450 0.000143 -0.316307 ×2212.93
On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.
Here are some numbers (in seconds) for the reference copy of mercurial:
Revset Before After abs-change speedup
-10: 0.000065 0.000097 0.000032 × 0.67
tip 0.000063 0.000078 0.000015 × 0.80
0 0.000561 0.000079 -0.000482 × 7.10
-10000: 0.004609 0.003648 -0.000961 × 1.26
0 + (-10000:) 0.005023 0.003715 -0.001307 × 1.35
(-10:) + :9 0.002187 0.000108 -0.002079 ×20.25
(-10000:) + 0 0.006252 0.003716 -0.002536 × 1.68
(-10000:) + (:99) 0.006367 0.003707 -0.002660 × 1.71
:9 + (-10:) 0.003846 0.000110 -0.003736 ×34.96
:9 0.003854 0.000099 -0.003755 ×38.92
:99 + (-10000:) 0.007644 0.003778 -0.003866 × 2.02
Differential Revision: https://phab.mercurial-scm.org/D7894
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Tue, 11 Feb 2020 11:18:52 +0100 |
parents | f81c17ec303c |
children | fc8299319ffe |
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from __future__ import absolute_import, print_function from mercurial import demandimport demandimport.enable() import os import subprocess import sys import types # Don't import pycompat because it has too many side-effects. ispy3 = sys.version_info[0] >= 3 # Only run if demandimport is allowed if subprocess.call( ['python', '%s/hghave' % os.environ['TESTDIR'], 'demandimport'] ): sys.exit(80) # We rely on assert, which gets optimized out. if sys.flags.optimize: sys.exit(80) # The demand importer doesn't work on Python 3.5. if sys.version_info[0:2] == (3, 5): sys.exit(80) if ispy3: from importlib.util import _LazyModule try: from importlib.util import _Module as moduletype except ImportError: moduletype = types.ModuleType else: moduletype = types.ModuleType if os.name != 'nt': try: import distutils.msvc9compiler print( 'distutils.msvc9compiler needs to be an immediate ' 'importerror on non-windows platforms' ) distutils.msvc9compiler except ImportError: pass import re rsub = re.sub def f(obj): l = repr(obj) l = rsub("0x[0-9a-fA-F]+", "0x?", l) l = rsub("from '.*'", "from '?'", l) l = rsub("'<[a-z]*>'", "'<whatever>'", l) return l demandimport.disable() os.environ['HGDEMANDIMPORT'] = 'disable' # this enable call should not actually enable demandimport! demandimport.enable() from mercurial import node # We use assert instead of a unittest test case because having imports inside # functions changes behavior of the demand importer. if ispy3: assert not isinstance(node, _LazyModule) else: assert f(node) == "<module 'mercurial.node' from '?'>", f(node) # now enable it for real del os.environ['HGDEMANDIMPORT'] demandimport.enable() # Test access to special attributes through demandmod proxy assert 'mercurial.error' not in sys.modules from mercurial import error as errorproxy if ispy3: # unsure why this isn't lazy. assert not isinstance(f, _LazyModule) assert f(errorproxy) == "<module 'mercurial.error' from '?'>", f(errorproxy) else: assert f(errorproxy) == "<unloaded module 'error'>", f(errorproxy) doc = ' '.join(errorproxy.__doc__.split()[:3]) assert doc == 'Mercurial exceptions. This', doc assert errorproxy.__name__ == 'mercurial.error', errorproxy.__name__ # __name__ must be accessible via __dict__ so the relative imports can be # resolved name = errorproxy.__dict__['__name__'] assert name == 'mercurial.error', name if ispy3: assert not isinstance(errorproxy, _LazyModule) assert f(errorproxy) == "<module 'mercurial.error' from '?'>", f(errorproxy) else: assert f(errorproxy) == "<proxied module 'error'>", f(errorproxy) import os if ispy3: assert not isinstance(os, _LazyModule) assert f(os) == "<module 'os' from '?'>", f(os) else: assert f(os) == "<unloaded module 'os'>", f(os) assert f(os.system) == '<built-in function system>', f(os.system) assert f(os) == "<module 'os' from '?'>", f(os) assert 'mercurial.utils.procutil' not in sys.modules from mercurial.utils import procutil if ispy3: assert isinstance(procutil, _LazyModule) assert f(procutil) == "<module 'mercurial.utils.procutil' from '?'>", f( procutil ) else: assert f(procutil) == "<unloaded module 'procutil'>", f(procutil) assert f(procutil.system) == '<function system at 0x?>', f(procutil.system) assert procutil.__class__ == moduletype, procutil.__class__ assert f(procutil) == "<module 'mercurial.utils.procutil' from '?'>", f( procutil ) assert f(procutil.system) == '<function system at 0x?>', f(procutil.system) assert 'mercurial.hgweb' not in sys.modules from mercurial import hgweb if ispy3: assert isinstance(hgweb, _LazyModule) assert f(hgweb) == "<module 'mercurial.hgweb' from '?'>", f(hgweb) assert isinstance(hgweb.hgweb_mod, _LazyModule) assert ( f(hgweb.hgweb_mod) == "<module 'mercurial.hgweb.hgweb_mod' from '?'>" ), f(hgweb.hgweb_mod) else: assert f(hgweb) == "<unloaded module 'hgweb'>", f(hgweb) assert f(hgweb.hgweb_mod) == "<unloaded module 'hgweb_mod'>", f( hgweb.hgweb_mod ) assert f(hgweb) == "<module 'mercurial.hgweb' from '?'>", f(hgweb) import re as fred if ispy3: assert not isinstance(fred, _LazyModule) assert f(fred) == "<module 're' from '?'>" else: assert f(fred) == "<unloaded module 're'>", f(fred) import re as remod if ispy3: assert not isinstance(remod, _LazyModule) assert f(remod) == "<module 're' from '?'>" else: assert f(remod) == "<unloaded module 're'>", f(remod) import sys as re if ispy3: assert not isinstance(re, _LazyModule) assert f(re) == "<module 'sys' (built-in)>" else: assert f(re) == "<unloaded module 'sys'>", f(re) if ispy3: assert not isinstance(fred, _LazyModule) assert f(fred) == "<module 're' from '?'>", f(fred) else: assert f(fred) == "<unloaded module 're'>", f(fred) assert f(fred.sub) == '<function sub at 0x?>', f(fred.sub) if ispy3: assert not isinstance(fred, _LazyModule) assert f(fred) == "<module 're' from '?'>", f(fred) else: assert f(fred) == "<proxied module 're'>", f(fred) remod.escape # use remod assert f(remod) == "<module 're' from '?'>", f(remod) if ispy3: assert not isinstance(re, _LazyModule) assert f(re) == "<module 'sys' (built-in)>" assert f(type(re.stderr)) == "<class '_io.TextIOWrapper'>", f( type(re.stderr) ) assert f(re) == "<module 'sys' (built-in)>" else: assert f(re) == "<unloaded module 'sys'>", f(re) assert f(re.stderr) == "<open file '<whatever>', mode 'w' at 0x?>", f( re.stderr ) assert f(re) == "<proxied module 'sys'>", f(re) assert 'telnetlib' not in sys.modules import telnetlib if ispy3: assert isinstance(telnetlib, _LazyModule) assert f(telnetlib) == "<module 'telnetlib' from '?'>" else: assert f(telnetlib) == "<unloaded module 'telnetlib'>", f(telnetlib) try: from telnetlib import unknownattr assert False, ( 'no demandmod should be created for attribute of non-package ' 'module:\ntelnetlib.unknownattr = %s' % f(unknownattr) ) except ImportError as inst: assert rsub(r"'", '', str(inst)).startswith( 'cannot import name unknownattr' ) from mercurial import util # Unlike the import statement, __import__() function should not raise # ImportError even if fromlist has an unknown item # (see Python/import.c:import_module_level() and ensure_fromlist()) assert 'zipfile' not in sys.modules zipfileimp = __import__('zipfile', globals(), locals(), ['unknownattr']) assert f(zipfileimp) == "<module 'zipfile' from '?'>", f(zipfileimp) assert not util.safehasattr(zipfileimp, 'unknownattr')