annotate hgext/sparse.py @ 42044:bb271ec2fbfb

compression: introduce a `storage.revlog.zstd.level` configuration

This option control the zstd compression level used when compressing revlog
chunk. The usage of zstd for revlog compression has not graduated from
experimental yet, but we intend to fix that soon.

The option name for the compression level is more straight forward to pick, so
this changesets comes first.  Having a dedicated option for each compression
engine is useful because they don't support the same range of values.

I ran the same measurement as for the zlib compression level (in the parent
changesets). The variation in repository size is stay mostly in the same (small)
range. The "read/write" performance see smallish variation, but are overall much
better than zlib. Write performance show the same tend of having better write
performance for when reaching high-end compression.

Again, we don't intend to change the default zstd compression level (currently:
3) in this series. However this is worth investigating in the future.

The Performance comparison of zlib vs zstd is quite impressive. The repository
size stay in the same range, but the performance are much better in all
situations.

Comparison summary
==================

We are looking at:
- performance range for zlib
- performance range for zstd
- comparison of default zstd (level-3) to default zlib (level 6)
- comparison of the slowest zstd time to the fastest zlib time

Read performance:
-----------------
          |           zlib          |           zstd          | cmp | f2s
mercurial |   0.170159 -   0.189219 |   0.144127 -   0.149624 | 80% | 88%
pypy      |   2.679217 -   2.768691 |   1.532317 -   1.705044 | 60% | 63%
netbeans  | 122.477027 - 141.620281 |  72.996346 -  89.731560 | 58% | 73%
mozilla   | 147.867662 - 170.572118 |  91.700995 - 105.853099 | 56% | 71%

Write performance:
------------------
          |           zlib          |           zstd          | cmp | f2s
mercurial |  53.250304 - 56.2936129 |  40.877025 -  45.677286 | 75% | 86%
pypy      | 460.721984 - 476.589918 | 270.545409 - 301.002219 | 63% | 65%
netbeans  | 520.560316 - 715.930400 | 370.356311 - 428.329652 | 55% | 82%
mozilla   | 739.803002 - 987.056093 | 505.152906 - 591.930683 | 57% | 80%

Raw data
--------

repo      alg lvl  .hg/store size  00manifest.d read       write

mercurial zlib  1      49,402,813     5,963,475   0.170159  53.250304
mercurial zlib  6      47,197,397     5,875,730   0.182820  56.264320
mercurial zlib  9      47,121,596     5,849,781   0.189219  56.293612

mercurial zstd  1      49,737,084     5,966,355   0.144127  40.877025
mercurial zstd  3      48,961,867     5,895,208   0.146376  42.268142
mercurial zstd  5      48,200,592     5,938,676   0.149624  43.162875
mercurial zstd 10      47,833,520     5,913,353   0.145185  44.012489
mercurial zstd 15      47,314,604     5,728,679   0.147686  45.677286
mercurial zstd 20      47,330,502     5,830,539   0.145789  45.025407
mercurial zstd 22      47,330,076     5,830,539   0.143996  44.690460


pypy      zlib  1     370,830,572    28,462,425   2.679217 460.721984
pypy      zlib  6     340,112,317    27,648,747   2.768691 467.537158
pypy      zlib  9     338,360,736    27,639,003   2.763495 476.589918

pypy      zstd  1     362,377,479    27,916,214   1.532317 270.545409
pypy      zstd  3     354,137,693    27,905,988   1.686718 294.951509
pypy      zstd  5     342,640,043    27,655,774   1.705044 301.002219
pypy      zstd 10     334,224,327    27,164,493   1.567287 285.186239
pypy      zstd 15     329,000,363    26,645,965   1.637729 299.561332
pypy      zstd 20     324,534,039    26,199,547   1.526813 302.149827
pypy      zstd 22     324,530,595    26,198,932   1.525718 307.821218


netbeans  zlib  1   1,281,847,810   165,495,457 122.477027 520.560316
netbeans  zlib  6   1,205,284,353   159,161,207 139.876147 715.930400
netbeans  zlib  9   1,197,135,671   155,034,586 141.620281 678.297064

netbeans  zstd  1   1,259,581,737   160,840,613  72.996346 370.356311
netbeans  zstd  3   1,232,978,122   157,691,551  81.622317 396.733087
netbeans  zstd  5   1,208,034,075   160,246,880  83.080549 364.342626
netbeans  zstd 10   1,188,624,176   156,083,417  79.323935 403.594602
netbeans  zstd 15   1,176,973,589   153,859,477  89.731560 428.329652
netbeans  zstd 20   1,162,958,258   151,147,535  82.842667 392.335349
netbeans  zstd 22   1,162,707,029   151,150,220  82.565695 402.840655


mozilla   zlib  1   2,775,497,186   298,527,987 147.867662 751.263721
mozilla   zlib  6   2,596,856,420   286,597,671 170.572118 987.056093
mozilla   zlib  9   2,587,542,494   287,018,264 163.622338 739.803002

mozilla   zstd  1   2,723,159,348   286,617,532  91.700995 570.042751
mozilla   zstd  3   2,665,055,001   286,152,013  95.240155 561.412805
mozilla   zstd  5   2,607,819,817   288,060,030 101.978048 505.152906
mozilla   zstd 10   2,558,761,085   283,967,648 104.113481 497.771202
mozilla   zstd 15   2,526,216,060   275,581,300 105.853099 591.930683
mozilla   zstd 20   2,485,114,806   266,478,859  95.268795 576.515389
mozilla   zstd 22   2,484,869,080   266,456,505  94.429282 572.785537

# sparse.py - allow sparse checkouts of the working directory
#
# Copyright 2014 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

"""allow sparse checkouts of the working directory (EXPERIMENTAL)

(This extension is not yet protected by backwards compatibility
guarantees. Any aspect may break in future releases until this
notice is removed.)

This extension allows the working directory to only consist of a
subset of files for the revision. This allows specific files or
directories to be explicitly included or excluded. Many repository
operations have performance proportional to the number of files in
the working directory. So only realizing a subset of files in the
working directory can improve performance.

Sparse Config Files
-------------------

The set of files that are part of a sparse checkout are defined by
a sparse config file. The file defines 3 things: includes (files to
include in the sparse checkout), excludes (files to exclude from the
sparse checkout), and profiles (links to other config files).

The file format is newline delimited. Empty lines and lines beginning
with ``#`` are ignored.

Lines beginning with ``%include `` denote another sparse config file
to include. e.g. ``%include tests.sparse``. The filename is relative
to the repository root.

The special lines ``[include]`` and ``[exclude]`` denote the section
for includes and excludes that follow, respectively. It is illegal to
have ``[include]`` after ``[exclude]``.

Non-special lines resemble file patterns to be added to either includes
or excludes. The syntax of these lines is documented by :hg:`help patterns`.
Patterns are interpreted as ``glob:`` by default and match against the
root of the repository.

Exclusion patterns take precedence over inclusion patterns. So even
if a file is explicitly included, an ``[exclude]`` entry can remove it.

For example, say you have a repository with 3 directories, ``frontend/``,
``backend/``, and ``tools/``. ``frontend/`` and ``backend/`` correspond
to different projects and it is uncommon for someone working on one
to need the files for the other. But ``tools/`` contains files shared
between both projects. Your sparse config files may resemble::

  # frontend.sparse
  frontend/**
  tools/**

  # backend.sparse
  backend/**
  tools/**

Say the backend grows in size. Or there's a directory with thousands
of files you wish to exclude. You can modify the profile to exclude
certain files::

  [include]
  backend/**
  tools/**

  [exclude]
  tools/tests/**
"""

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    commands,
    dirstate,
    error,
    extensions,
    hg,
    logcmdutil,
    match as matchmod,
    pycompat,
    registrar,
    sparse,
    util,
)

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'

cmdtable = {}
command = registrar.command(cmdtable)

def extsetup(ui):
    sparse.enabled = True

    _setupclone(ui)
    _setuplog(ui)
    _setupadd(ui)
    _setupdirstate(ui)

def replacefilecache(cls, propname, replacement):
    """Replace a filecache property with a new class. This allows changing the
    cache invalidation condition."""
    origcls = cls
    assert callable(replacement)
    while cls is not object:
        if propname in cls.__dict__:
            orig = cls.__dict__[propname]
            setattr(cls, propname, replacement(orig))
            break
        cls = cls.__bases__[0]

    if cls is object:
        raise AttributeError(_("type '%s' has no property '%s'") % (origcls,
                             propname))

def _setuplog(ui):
    entry = commands.table['log|history']
    entry[1].append(('', 'sparse', None,
        "limit to changesets affecting the sparse checkout"))

    def _initialrevs(orig, repo, opts):
        revs = orig(repo, opts)
        if opts.get('sparse'):
            sparsematch = sparse.matcher(repo)
            def ctxmatch(rev):
                ctx = repo[rev]
                return any(f for f in ctx.files() if sparsematch(f))
            revs = revs.filter(ctxmatch)
        return revs
    extensions.wrapfunction(logcmdutil, '_initialrevs', _initialrevs)

def _clonesparsecmd(orig, ui, repo, *args, **opts):
    include_pat = opts.get(r'include')
    exclude_pat = opts.get(r'exclude')
    enableprofile_pat = opts.get(r'enable_profile')
    narrow_pat = opts.get(r'narrow')
    include = exclude = enableprofile = False
    if include_pat:
        pat = include_pat
        include = True
    if exclude_pat:
        pat = exclude_pat
        exclude = True
    if enableprofile_pat:
        pat = enableprofile_pat
        enableprofile = True
    if sum([include, exclude, enableprofile]) > 1:
        raise error.Abort(_("too many flags specified."))
    # if --narrow is passed, it means they are includes and excludes for narrow
    # clone
    if not narrow_pat and (include or exclude or enableprofile):
        def clonesparse(orig, self, node, overwrite, *args, **kwargs):
            sparse.updateconfig(self.unfiltered(), pat, {}, include=include,
                                exclude=exclude, enableprofile=enableprofile,
                                usereporootpaths=True)
            return orig(self, node, overwrite, *args, **kwargs)
        extensions.wrapfunction(hg, 'updaterepo', clonesparse)
    return orig(ui, repo, *args, **opts)

def _setupclone(ui):
    entry = commands.table['clone']
    entry[1].append(('', 'enable-profile', [],
                    'enable a sparse profile'))
    entry[1].append(('', 'include', [],
                    'include sparse pattern'))
    entry[1].append(('', 'exclude', [],
                    'exclude sparse pattern'))
    extensions.wrapcommand(commands.table, 'clone', _clonesparsecmd)

def _setupadd(ui):
    entry = commands.table['add']
    entry[1].append(('s', 'sparse', None,
                    'also include directories of added files in sparse config'))

    def _add(orig, ui, repo, *pats, **opts):
        if opts.get(r'sparse'):
            dirs = set()
            for pat in pats:
                dirname, basename = util.split(pat)
                dirs.add(dirname)
            sparse.updateconfig(repo, list(dirs), opts, include=True)
        return orig(ui, repo, *pats, **opts)

    extensions.wrapcommand(commands.table, 'add', _add)

def _setupdirstate(ui):
    """Modify the dirstate to prevent stat'ing excluded files,
    and to prevent modifications to files outside the checkout.
    """

    def walk(orig, self, match, subrepos, unknown, ignored, full=True):
        # hack to not exclude explicitly-specified paths so that they can
        # be warned later on e.g. dirstate.add()
        em = matchmod.exact(match.files())
        sm = matchmod.unionmatcher([self._sparsematcher, em])
        match = matchmod.intersectmatchers(match, sm)
        return orig(self, match, subrepos, unknown, ignored, full)

    extensions.wrapfunction(dirstate.dirstate, 'walk', walk)

    # dirstate.rebuild should not add non-matching files
    def _rebuild(orig, self, parent, allfiles, changedfiles=None):
        matcher = self._sparsematcher
        if not matcher.always():
            allfiles = [f for f in allfiles if matcher(f)]
            if changedfiles:
                changedfiles = [f for f in changedfiles if matcher(f)]

            if changedfiles is not None:
                # In _rebuild, these files will be deleted from the dirstate
                # when they are not found to be in allfiles
                dirstatefilestoremove = set(f for f in self if not matcher(f))
                changedfiles = dirstatefilestoremove.union(changedfiles)

        return orig(self, parent, allfiles, changedfiles)
    extensions.wrapfunction(dirstate.dirstate, 'rebuild', _rebuild)

    # Prevent adding files that are outside the sparse checkout
    editfuncs = ['normal', 'add', 'normallookup', 'copy', 'remove', 'merge']
    hint = _('include file with `hg debugsparse --include <pattern>` or use ' +
             '`hg add -s <file>` to include file directory while adding')
    for func in editfuncs:
        def _wrapper(orig, self, *args):
            sparsematch = self._sparsematcher
            if not sparsematch.always():
                for f in args:
                    if (f is not None and not sparsematch(f) and
                        f not in self):
                        raise error.Abort(_("cannot add '%s' - it is outside "
                                            "the sparse checkout") % f,
                                          hint=hint)
            return orig(self, *args)
        extensions.wrapfunction(dirstate.dirstate, func, _wrapper)

@command('debugsparse', [
    ('I', 'include', False, _('include files in the sparse checkout')),
    ('X', 'exclude', False, _('exclude files in the sparse checkout')),
    ('d', 'delete', False, _('delete an include/exclude rule')),
    ('f', 'force', False, _('allow changing rules even with pending changes')),
    ('', 'enable-profile', False, _('enables the specified profile')),
    ('', 'disable-profile', False, _('disables the specified profile')),
    ('', 'import-rules', False, _('imports rules from a file')),
    ('', 'clear-rules', False, _('clears local include/exclude rules')),
    ('', 'refresh', False, _('updates the working after sparseness changes')),
    ('', 'reset', False, _('makes the repo full again')),
    ] + commands.templateopts,
    _('[--OPTION] PATTERN...'),
    helpbasic=True)
def debugsparse(ui, repo, *pats, **opts):
    """make the current checkout sparse, or edit the existing checkout

    The sparse command is used to make the current checkout sparse.
    This means files that don't meet the sparse condition will not be
    written to disk, or show up in any working copy operations. It does
    not affect files in history in any way.

    Passing no arguments prints the currently applied sparse rules.

    --include and --exclude are used to add and remove files from the sparse
    checkout. The effects of adding an include or exclude rule are applied
    immediately. If applying the new rule would cause a file with pending
    changes to be added or removed, the command will fail. Pass --force to
    force a rule change even with pending changes (the changes on disk will
    be preserved).

    --delete removes an existing include/exclude rule. The effects are
    immediate.

    --refresh refreshes the files on disk based on the sparse rules. This is
    only necessary if .hg/sparse was changed by hand.

    --enable-profile and --disable-profile accept a path to a .hgsparse file.
    This allows defining sparse checkouts and tracking them inside the
    repository. This is useful for defining commonly used sparse checkouts for
    many people to use. As the profile definition changes over time, the sparse
    checkout will automatically be updated appropriately, depending on which
    changeset is checked out. Changes to .hgsparse are not applied until they
    have been committed.

    --import-rules accepts a path to a file containing rules in the .hgsparse
    format, allowing you to add --include, --exclude and --enable-profile rules
    in bulk. Like the --include, --exclude and --enable-profile switches, the
    changes are applied immediately.

    --clear-rules removes all local include and exclude rules, while leaving
    any enabled profiles in place.

    Returns 0 if editing the sparse checkout succeeds.
    """
    opts = pycompat.byteskwargs(opts)
    include = opts.get('include')
    exclude = opts.get('exclude')
    force = opts.get('force')
    enableprofile = opts.get('enable_profile')
    disableprofile = opts.get('disable_profile')
    importrules = opts.get('import_rules')
    clearrules = opts.get('clear_rules')
    delete = opts.get('delete')
    refresh = opts.get('refresh')
    reset = opts.get('reset')
    count = sum([include, exclude, enableprofile, disableprofile, delete,
                 importrules, refresh, clearrules, reset])
    if count > 1:
        raise error.Abort(_("too many flags specified"))

    if count == 0:
        if repo.vfs.exists('sparse'):
            ui.status(repo.vfs.read("sparse") + "\n")
            temporaryincludes = sparse.readtemporaryincludes(repo)
            if temporaryincludes:
                ui.status(_("Temporarily Included Files (for merge/rebase):\n"))
                ui.status(("\n".join(temporaryincludes) + "\n"))
            return
        else:
            raise error.Abort(_('the debugsparse command is only supported on'
                                ' sparse repositories'))

    if include or exclude or delete or reset or enableprofile or disableprofile:
        sparse.updateconfig(repo, pats, opts, include=include, exclude=exclude,
                            reset=reset, delete=delete,
                            enableprofile=enableprofile,
                            disableprofile=disableprofile, force=force)

    if importrules:
        sparse.importfromfiles(repo, opts, pats, force=force)

    if clearrules:
        sparse.clearrules(repo, force=force)

    if refresh:
        try:
            wlock = repo.wlock()
            fcounts = map(
                len,
                sparse.refreshwdir(repo, repo.status(), sparse.matcher(repo),
                                   force=force))
            sparse.printchanges(ui, opts, added=fcounts[0], dropped=fcounts[1],
                                conflicting=fcounts[2])
        finally:
            wlock.release()