rust-index: optimize find_gca_candidates() on less than 8 revisions
This is expected to be by far the most common case, given that, e.g.,
merging involves using it on two revisions.
Using a `u8` as support for the bitset obviously divides the amount of
RAM needed by 8. To state the obvious, on a repository with 10 million
changesets, this spares 70MB. It is also possible that it'd be slightly
faster, because it is easier to allocate and provides better cache locality.
It is possible that some exhaustive listing of the traits implemented by
`u8` and `u64` would avoid the added duplication, but that can be done later
and would need a replacement for the `MAX` consts.
# shallowrepo.py - shallow repository that uses remote filelogs
#
# Copyright 2013 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.
import os
from mercurial.i18n import _
from mercurial.node import hex, nullrev
from mercurial import (
encoding,
error,
localrepo,
match,
scmutil,
sparse,
util,
)
from mercurial.utils import procutil
from . import (
connectionpool,
constants,
contentstore,
datapack,
fileserverclient,
historypack,
metadatastore,
remotefilectx,
remotefilelog,
shallowutil,
)
# These make*stores functions are global so that other extensions can replace
# them.
def makelocalstores(repo):
"""In-repo stores, like .hg/store/data; can not be discarded."""
localpath = os.path.join(repo.svfs.vfs.base, b'data')
if not os.path.exists(localpath):
os.makedirs(localpath)
# Instantiate local data stores
localcontent = contentstore.remotefilelogcontentstore(
repo, localpath, repo.name, shared=False
)
localmetadata = metadatastore.remotefilelogmetadatastore(
repo, localpath, repo.name, shared=False
)
return localcontent, localmetadata
def makecachestores(repo):
"""Typically machine-wide, cache of remote data; can be discarded."""
# Instantiate shared cache stores
cachepath = shallowutil.getcachepath(repo.ui)
cachecontent = contentstore.remotefilelogcontentstore(
repo, cachepath, repo.name, shared=True
)
cachemetadata = metadatastore.remotefilelogmetadatastore(
repo, cachepath, repo.name, shared=True
)
repo.sharedstore = cachecontent
repo.shareddatastores.append(cachecontent)
repo.sharedhistorystores.append(cachemetadata)
return cachecontent, cachemetadata
def makeremotestores(repo, cachecontent, cachemetadata):
"""These stores fetch data from a remote server."""
# Instantiate remote stores
repo.fileservice = fileserverclient.fileserverclient(repo)
remotecontent = contentstore.remotecontentstore(
repo.ui, repo.fileservice, cachecontent
)
remotemetadata = metadatastore.remotemetadatastore(
repo.ui, repo.fileservice, cachemetadata
)
return remotecontent, remotemetadata
def makepackstores(repo):
"""Packs are more efficient (to read from) cache stores."""
# Instantiate pack stores
packpath = shallowutil.getcachepackpath(repo, constants.FILEPACK_CATEGORY)
packcontentstore = datapack.datapackstore(repo.ui, packpath)
packmetadatastore = historypack.historypackstore(repo.ui, packpath)
repo.shareddatastores.append(packcontentstore)
repo.sharedhistorystores.append(packmetadatastore)
shallowutil.reportpackmetrics(
repo.ui, b'filestore', packcontentstore, packmetadatastore
)
return packcontentstore, packmetadatastore
def makeunionstores(repo):
"""Union stores iterate the other stores and return the first result."""
repo.shareddatastores = []
repo.sharedhistorystores = []
packcontentstore, packmetadatastore = makepackstores(repo)
cachecontent, cachemetadata = makecachestores(repo)
localcontent, localmetadata = makelocalstores(repo)
remotecontent, remotemetadata = makeremotestores(
repo, cachecontent, cachemetadata
)
# Instantiate union stores
repo.contentstore = contentstore.unioncontentstore(
packcontentstore,
cachecontent,
localcontent,
remotecontent,
writestore=localcontent,
)
repo.metadatastore = metadatastore.unionmetadatastore(
packmetadatastore,
cachemetadata,
localmetadata,
remotemetadata,
writestore=localmetadata,
)
fileservicedatawrite = cachecontent
fileservicehistorywrite = cachemetadata
repo.fileservice.setstore(
repo.contentstore,
repo.metadatastore,
fileservicedatawrite,
fileservicehistorywrite,
)
shallowutil.reportpackmetrics(
repo.ui, b'filestore', packcontentstore, packmetadatastore
)
def wraprepo(repo):
class shallowrepository(repo.__class__):
@util.propertycache
def name(self):
return self.ui.config(b'remotefilelog', b'reponame')
@util.propertycache
def fallbackpath(self):
path = repo.ui.config(
b"remotefilelog",
b"fallbackpath",
repo.ui.config(b'paths', b'default'),
)
if not path:
raise error.Abort(
b"no remotefilelog server "
b"configured - is your .hg/hgrc trusted?"
)
return path
def maybesparsematch(self, *revs, **kwargs):
"""
A wrapper that allows the remotefilelog to invoke sparsematch() if
this is a sparse repository, or returns None if this is not a
sparse repository.
"""
if revs:
ret = sparse.matcher(repo, revs=revs)
else:
ret = sparse.matcher(repo)
if ret.always():
return None
return ret
def file(self, f):
if f[0] == b'/':
f = f[1:]
if self.shallowmatch(f):
return remotefilelog.remotefilelog(self.svfs, f, self)
else:
return super(shallowrepository, self).file(f)
def filectx(self, path, *args, **kwargs):
if self.shallowmatch(path):
return remotefilectx.remotefilectx(self, path, *args, **kwargs)
else:
return super(shallowrepository, self).filectx(
path, *args, **kwargs
)
@localrepo.unfilteredmethod
def commitctx(self, ctx, error=False, origctx=None):
"""Add a new revision to current repository.
Revision information is passed via the context argument.
"""
# some contexts already have manifest nodes, they don't need any
# prefetching (for example if we're just editing a commit message
# we can reuse manifest
if not ctx.manifestnode():
# prefetch files that will likely be compared
m1 = ctx.p1().manifest()
files = []
for f in ctx.modified() + ctx.added():
fparent1 = m1.get(f, self.nullid)
if fparent1 != self.nullid:
files.append((f, hex(fparent1)))
self.fileservice.prefetch(files)
return super(shallowrepository, self).commitctx(
ctx, error=error, origctx=origctx
)
def backgroundprefetch(
self, revs, base=None, repack=False, pats=None, opts=None
):
"""Runs prefetch in background with optional repack"""
cmd = [procutil.hgexecutable(), b'-R', repo.origroot, b'prefetch']
if repack:
cmd.append(b'--repack')
if revs:
cmd += [b'-r', revs]
# We know this command will find a binary, so don't block
# on it starting.
kwargs = {}
if repo.ui.configbool(b'devel', b'remotefilelog.bg-wait'):
kwargs['record_wait'] = repo.ui.atexit
procutil.runbgcommand(
cmd, encoding.environ, ensurestart=False, **kwargs
)
def prefetch(self, revs, base=None, pats=None, opts=None):
"""Prefetches all the necessary file revisions for the given revs
Optionally runs repack in background
"""
with repo._lock(
repo.svfs,
b'prefetchlock',
True,
None,
None,
_(b'prefetching in %s') % repo.origroot,
):
self._prefetch(revs, base, pats, opts)
def _prefetch(self, revs, base=None, pats=None, opts=None):
fallbackpath = self.fallbackpath
if fallbackpath:
# If we know a rev is on the server, we should fetch the server
# version of those files, since our local file versions might
# become obsolete if the local commits are stripped.
localrevs = repo.revs(b'outgoing(%s)', fallbackpath)
if base is not None and base != nullrev:
serverbase = list(
repo.revs(
b'first(reverse(::%s) - %ld)', base, localrevs
)
)
if serverbase:
base = serverbase[0]
else:
localrevs = repo
mfl = repo.manifestlog
mfrevlog = mfl.getstorage(b'')
if base is not None:
mfdict = mfl[repo[base].manifestnode()].read()
skip = set(mfdict.items())
else:
skip = set()
# Copy the skip set to start large and avoid constant resizing,
# and since it's likely to be very similar to the prefetch set.
files = skip.copy()
serverfiles = skip.copy()
visited = set()
visited.add(nullrev)
revcount = len(revs)
progress = self.ui.makeprogress(_(b'prefetching'), total=revcount)
progress.update(0)
for rev in sorted(revs):
ctx = repo[rev]
if pats:
m = scmutil.match(ctx, pats, opts)
sparsematch = repo.maybesparsematch(rev)
mfnode = ctx.manifestnode()
mfrev = mfrevlog.rev(mfnode)
# Decompressing manifests is expensive.
# When possible, only read the deltas.
p1, p2 = mfrevlog.parentrevs(mfrev)
if p1 in visited and p2 in visited:
mfdict = mfl[mfnode].readfast()
else:
mfdict = mfl[mfnode].read()
diff = mfdict.items()
if pats:
diff = (pf for pf in diff if m(pf[0]))
if sparsematch:
diff = (pf for pf in diff if sparsematch(pf[0]))
if rev not in localrevs:
serverfiles.update(diff)
else:
files.update(diff)
visited.add(mfrev)
progress.increment()
files.difference_update(skip)
serverfiles.difference_update(skip)
progress.complete()
# Fetch files known to be on the server
if serverfiles:
results = [(path, hex(fnode)) for (path, fnode) in serverfiles]
repo.fileservice.prefetch(results, force=True)
# Fetch files that may or may not be on the server
if files:
results = [(path, hex(fnode)) for (path, fnode) in files]
repo.fileservice.prefetch(results)
def close(self):
super(shallowrepository, self).close()
self.connectionpool.close()
repo.__class__ = shallowrepository
repo.shallowmatch = match.always()
makeunionstores(repo)
repo.includepattern = repo.ui.configlist(
b"remotefilelog", b"includepattern", None
)
repo.excludepattern = repo.ui.configlist(
b"remotefilelog", b"excludepattern", None
)
if not hasattr(repo, 'connectionpool'):
repo.connectionpool = connectionpool.connectionpool(repo)
if repo.includepattern or repo.excludepattern:
repo.shallowmatch = match.match(
repo.root, b'', None, repo.includepattern, repo.excludepattern
)