Mercurial > hg
view mercurial/verify.py @ 30212:260af19891f2
changegroup: increase write buffer size to 128k
By default, Python defers to the operating system for choosing the
default buffer size on opened files. On my Linux machine, the default
is 4k, which is really small for 2016.
This patch bumps the write buffer size when writing
changegroups/bundles to 128k. This matches the 128k read buffer
we already use on revlogs.
It's worth noting that this only impacts when writing to an explicit
file (such as during `hg bundle`). Buffers when writing to bundle
files via the repo vfs or to a temporary file are not impacted.
When producing a none-v2 bundle file of the mozilla-unified repository,
this change caused the number of write() system calls to drop from
952,449 to 29,788. After this change, the most frequent system
calls are fstat(), read(), lseek(), and open(). There were
2,523,672 system calls after this patch (so a net decrease of
~950k is statistically significant).
This change shows no performance change on my system. But I have a
high-end system with a fast SSD. It is quite possible this change
will have a significant impact on network file systems, where
extra network round trips due to excessive I/O system calls could
introduce significant latency.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 16 Oct 2016 13:35:23 -0700 |
parents | bd37f0d53a49 |
children | f65faa4422c8 |
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# verify.py - repository integrity checking for Mercurial # # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import os from .i18n import _ from .node import ( nullid, short, ) from . import ( error, revlog, util, ) def verify(repo): with repo.lock(): return verifier(repo).verify() def _normpath(f): # under hg < 2.4, convert didn't sanitize paths properly, so a # converted repo may contain repeated slashes while '//' in f: f = f.replace('//', '/') return f def _validpath(repo, path): """Returns False if a path should NOT be treated as part of a repo. For all in-core cases, this returns True, as we have no way for a path to be mentioned in the history but not actually be relevant. For narrow clones, this is important because many filelogs will be missing, and changelog entries may mention modified files that are outside the narrow scope. """ return True class verifier(object): def __init__(self, repo): self.repo = repo.unfiltered() self.ui = repo.ui self.badrevs = set() self.errors = 0 self.warnings = 0 self.havecl = len(repo.changelog) > 0 self.havemf = len(repo.manifest) > 0 self.revlogv1 = repo.changelog.version != revlog.REVLOGV0 self.lrugetctx = util.lrucachefunc(repo.changectx) self.refersmf = False self.fncachewarned = False def warn(self, msg): self.ui.warn(msg + "\n") self.warnings += 1 def err(self, linkrev, msg, filename=None): if linkrev is not None: self.badrevs.add(linkrev) else: linkrev = '?' msg = "%s: %s" % (linkrev, msg) if filename: msg = "%s@%s" % (filename, msg) self.ui.warn(" " + msg + "\n") self.errors += 1 def exc(self, linkrev, msg, inst, filename=None): if not str(inst): inst = repr(inst) self.err(linkrev, "%s: %s" % (msg, inst), filename) def checklog(self, obj, name, linkrev): if not len(obj) and (self.havecl or self.havemf): self.err(linkrev, _("empty or missing %s") % name) return d = obj.checksize() if d[0]: self.err(None, _("data length off by %d bytes") % d[0], name) if d[1]: self.err(None, _("index contains %d extra bytes") % d[1], name) if obj.version != revlog.REVLOGV0: if not self.revlogv1: self.warn(_("warning: `%s' uses revlog format 1") % name) elif self.revlogv1: self.warn(_("warning: `%s' uses revlog format 0") % name) def checkentry(self, obj, i, node, seen, linkrevs, f): lr = obj.linkrev(obj.rev(node)) if lr < 0 or (self.havecl and lr not in linkrevs): if lr < 0 or lr >= len(self.repo.changelog): msg = _("rev %d points to nonexistent changeset %d") else: msg = _("rev %d points to unexpected changeset %d") self.err(None, msg % (i, lr), f) if linkrevs: if f and len(linkrevs) > 1: try: # attempt to filter down to real linkrevs linkrevs = [l for l in linkrevs if self.lrugetctx(l)[f].filenode() == node] except Exception: pass self.warn(_(" (expected %s)") % " ".join(map(str, linkrevs))) lr = None # can't be trusted try: p1, p2 = obj.parents(node) if p1 not in seen and p1 != nullid: self.err(lr, _("unknown parent 1 %s of %s") % (short(p1), short(node)), f) if p2 not in seen and p2 != nullid: self.err(lr, _("unknown parent 2 %s of %s") % (short(p2), short(node)), f) except Exception as inst: self.exc(lr, _("checking parents of %s") % short(node), inst, f) if node in seen: self.err(lr, _("duplicate revision %d (%d)") % (i, seen[node]), f) seen[node] = i return lr def verify(self): repo = self.repo ui = repo.ui if not repo.url().startswith('file:'): raise error.Abort(_("cannot verify bundle or remote repos")) if os.path.exists(repo.sjoin("journal")): ui.warn(_("abandoned transaction found - run hg recover\n")) if ui.verbose or not self.revlogv1: ui.status(_("repository uses revlog format %d\n") % (self.revlogv1 and 1 or 0)) mflinkrevs, filelinkrevs = self._verifychangelog() filenodes = self._verifymanifest(mflinkrevs) del mflinkrevs self._crosscheckfiles(filelinkrevs, filenodes) totalfiles, filerevisions = self._verifyfiles(filenodes, filelinkrevs) ui.status(_("%d files, %d changesets, %d total revisions\n") % (totalfiles, len(repo.changelog), filerevisions)) if self.warnings: ui.warn(_("%d warnings encountered!\n") % self.warnings) if self.fncachewarned: ui.warn(_('hint: run "hg debugrebuildfncache" to recover from ' 'corrupt fncache\n')) if self.errors: ui.warn(_("%d integrity errors encountered!\n") % self.errors) if self.badrevs: ui.warn(_("(first damaged changeset appears to be %d)\n") % min(self.badrevs)) return 1 def _verifychangelog(self): ui = self.ui repo = self.repo cl = repo.changelog ui.status(_("checking changesets\n")) mflinkrevs = {} filelinkrevs = {} seen = {} self.checklog(cl, "changelog", 0) total = len(repo) for i in repo: ui.progress(_('checking'), i, total=total, unit=_('changesets')) n = cl.node(i) self.checkentry(cl, i, n, seen, [i], "changelog") try: changes = cl.read(n) if changes[0] != nullid: mflinkrevs.setdefault(changes[0], []).append(i) self.refersmf = True for f in changes[3]: if _validpath(repo, f): filelinkrevs.setdefault(_normpath(f), []).append(i) except Exception as inst: self.refersmf = True self.exc(i, _("unpacking changeset %s") % short(n), inst) ui.progress(_('checking'), None) return mflinkrevs, filelinkrevs def _verifymanifest(self, mflinkrevs, dir="", storefiles=None, progress=None): repo = self.repo ui = self.ui mf = self.repo.manifest.dirlog(dir) if not dir: self.ui.status(_("checking manifests\n")) filenodes = {} subdirnodes = {} seen = {} label = "manifest" if dir: label = dir revlogfiles = mf.files() storefiles.difference_update(revlogfiles) if progress: # should be true since we're in a subdirectory progress() if self.refersmf: # Do not check manifest if there are only changelog entries with # null manifests. self.checklog(mf, label, 0) total = len(mf) for i in mf: if not dir: ui.progress(_('checking'), i, total=total, unit=_('manifests')) n = mf.node(i) lr = self.checkentry(mf, i, n, seen, mflinkrevs.get(n, []), label) if n in mflinkrevs: del mflinkrevs[n] elif dir: self.err(lr, _("%s not in parent-directory manifest") % short(n), label) else: self.err(lr, _("%s not in changesets") % short(n), label) try: for f, fn, fl in mf.readshallowdelta(n).iterentries(): if not f: self.err(lr, _("entry without name in manifest")) elif f == "/dev/null": # ignore this in very old repos continue fullpath = dir + _normpath(f) if not _validpath(repo, fullpath): continue if fl == 't': subdirnodes.setdefault(fullpath + '/', {}).setdefault( fn, []).append(lr) else: filenodes.setdefault(fullpath, {}).setdefault(fn, lr) except Exception as inst: self.exc(lr, _("reading delta %s") % short(n), inst, label) if not dir: ui.progress(_('checking'), None) if self.havemf: for c, m in sorted([(c, m) for m in mflinkrevs for c in mflinkrevs[m]]): if dir: self.err(c, _("parent-directory manifest refers to unknown " "revision %s") % short(m), label) else: self.err(c, _("changeset refers to unknown revision %s") % short(m), label) if not dir and subdirnodes: self.ui.status(_("checking directory manifests\n")) storefiles = set() subdirs = set() revlogv1 = self.revlogv1 for f, f2, size in repo.store.datafiles(): if not f: self.err(None, _("cannot decode filename '%s'") % f2) elif (size > 0 or not revlogv1) and f.startswith('meta/'): storefiles.add(_normpath(f)) subdirs.add(os.path.dirname(f)) subdircount = len(subdirs) currentsubdir = [0] def progress(): currentsubdir[0] += 1 ui.progress(_('checking'), currentsubdir[0], total=subdircount, unit=_('manifests')) for subdir, linkrevs in subdirnodes.iteritems(): subdirfilenodes = self._verifymanifest(linkrevs, subdir, storefiles, progress) for f, onefilenodes in subdirfilenodes.iteritems(): filenodes.setdefault(f, {}).update(onefilenodes) if not dir and subdirnodes: ui.progress(_('checking'), None) for f in sorted(storefiles): self.warn(_("warning: orphan revlog '%s'") % f) return filenodes def _crosscheckfiles(self, filelinkrevs, filenodes): repo = self.repo ui = self.ui ui.status(_("crosschecking files in changesets and manifests\n")) total = len(filelinkrevs) + len(filenodes) count = 0 if self.havemf: for f in sorted(filelinkrevs): count += 1 ui.progress(_('crosschecking'), count, total=total) if f not in filenodes: lr = filelinkrevs[f][0] self.err(lr, _("in changeset but not in manifest"), f) if self.havecl: for f in sorted(filenodes): count += 1 ui.progress(_('crosschecking'), count, total=total) if f not in filelinkrevs: try: fl = repo.file(f) lr = min([fl.linkrev(fl.rev(n)) for n in filenodes[f]]) except Exception: lr = None self.err(lr, _("in manifest but not in changeset"), f) ui.progress(_('crosschecking'), None) def _verifyfiles(self, filenodes, filelinkrevs): repo = self.repo ui = self.ui lrugetctx = self.lrugetctx revlogv1 = self.revlogv1 havemf = self.havemf ui.status(_("checking files\n")) storefiles = set() for f, f2, size in repo.store.datafiles(): if not f: self.err(None, _("cannot decode filename '%s'") % f2) elif (size > 0 or not revlogv1) and f.startswith('data/'): storefiles.add(_normpath(f)) files = sorted(set(filenodes) | set(filelinkrevs)) total = len(files) revisions = 0 for i, f in enumerate(files): ui.progress(_('checking'), i, item=f, total=total, unit=_('files')) try: linkrevs = filelinkrevs[f] except KeyError: # in manifest but not in changelog linkrevs = [] if linkrevs: lr = linkrevs[0] else: lr = None try: fl = repo.file(f) except error.RevlogError as e: self.err(lr, _("broken revlog! (%s)") % e, f) continue for ff in fl.files(): try: storefiles.remove(ff) except KeyError: self.warn(_(" warning: revlog '%s' not in fncache!") % ff) self.fncachewarned = True self.checklog(fl, f, lr) seen = {} rp = None for i in fl: revisions += 1 n = fl.node(i) lr = self.checkentry(fl, i, n, seen, linkrevs, f) if f in filenodes: if havemf and n not in filenodes[f]: self.err(lr, _("%s not in manifests") % (short(n)), f) else: del filenodes[f][n] # verify contents try: l = len(fl.read(n)) rp = fl.renamed(n) if l != fl.size(i): if len(fl.revision(n)) != fl.size(i): self.err(lr, _("unpacked size is %s, %s expected") % (l, fl.size(i)), f) except error.CensoredNodeError: # experimental config: censor.policy if ui.config("censor", "policy", "abort") == "abort": self.err(lr, _("censored file data"), f) except Exception as inst: self.exc(lr, _("unpacking %s") % short(n), inst, f) # check renames try: if rp: if lr is not None and ui.verbose: ctx = lrugetctx(lr) found = False for pctx in ctx.parents(): if rp[0] in pctx: found = True break if not found: self.warn(_("warning: copy source of '%s' not" " in parents of %s") % (f, ctx)) fl2 = repo.file(rp[0]) if not len(fl2): self.err(lr, _("empty or missing copy source " "revlog %s:%s") % (rp[0], short(rp[1])), f) elif rp[1] == nullid: ui.note(_("warning: %s@%s: copy source" " revision is nullid %s:%s\n") % (f, lr, rp[0], short(rp[1]))) else: fl2.rev(rp[1]) except Exception as inst: self.exc(lr, _("checking rename of %s") % short(n), inst, f) # cross-check if f in filenodes: fns = [(lr, n) for n, lr in filenodes[f].iteritems()] for lr, node in sorted(fns): self.err(lr, _("manifest refers to unknown revision %s") % short(node), f) ui.progress(_('checking'), None) for f in sorted(storefiles): self.warn(_("warning: orphan revlog '%s'") % f) return len(files), revisions