Mercurial > hg > evolve
changeset 2333:98e0369b548b
stablerange: introduce ondisk caching through sqlite
There is many short cut and limitation with this first version of a cache but
this allow use to envision some actual usage of the stablerange thingy so let us
got for it.
author | Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
---|---|
date | Fri, 24 Mar 2017 16:05:28 +0100 |
parents | c0e2ba85e76a |
children | aac765e84de3 |
files | hgext3rd/evolve/stablerange.py |
diffstat | 1 files changed, 211 insertions(+), 1 deletions(-) [+] |
line wrap: on
line diff
--- a/hgext3rd/evolve/stablerange.py +++ b/hgext3rd/evolve/stablerange.py @@ -10,13 +10,16 @@ import collections import heapq import math +import sqlite3 from mercurial import ( commands, cmdutil, + error, localrepo, node as nodemod, scmutil, + util, ) from mercurial.i18n import _ @@ -661,6 +664,213 @@ result.append(top) return result +############################# +### simple sqlite caching ### +############################# + +_sqliteschema = [ + """CREATE TABLE meta(schemaversion INTEGER NOT NULL, + tiprev INTEGER NOT NULL, + tipnode BLOB NOT NULL + );""", + "CREATE TABLE depth(rev INTEGER NOT NULL PRIMARY KEY, depth INTEGER NOT NULL);", + """CREATE TABLE range(rev INTEGER NOT NULL, + idx INTEGER NOT NULL, + PRIMARY KEY(rev, idx));""", + """CREATE TABLE subranges(listidx INTEGER NOT NULL, + suprev INTEGER NOT NULL, + supidx INTEGER NOT NULL, + subrev INTEGER NOT NULL, + subidx INTEGER NOT NULL, + PRIMARY KEY(listidx, suprev, supidx), + FOREIGN KEY (suprev, supidx) REFERENCES range(rev, idx), + FOREIGN KEY (subrev, subidx) REFERENCES range(rev, idx) + );""", + "CREATE INDEX subrange_index ON subranges (suprev, supidx);", + "CREATE INDEX depth_index ON depth (rev);" +] +_newmeta = "INSERT INTO meta (schemaversion, tiprev, tipnode) VALUES (?,?,?);" +_updatemeta = "UPDATE meta SET tiprev = ?, tipnode = ?;" +_updatedepth = "INSERT INTO depth(rev, depth) VALUES (?,?);" +_updaterange = "INSERT INTO range(rev, idx) VALUES (?,?);" +_updatesubranges = """INSERT + INTO subranges(listidx, suprev, supidx, subrev, subidx) + VALUES (?,?,?,?,?);""" +_queryexist = "SELECT name FROM sqlite_master WHERE type='table' AND name='meta';" +_querymeta = "SELECT schemaversion, tiprev, tipnode FROM meta;" +_querydepth = "SELECT depth FROM depth WHERE rev = ?;" +_batchdepth = "SELECT rev, depth FROM depth;" +_queryrange = "SELECT * FROM range WHERE (rev = ? AND idx = ?);" +_querysubranges = """SELECT subrev, subidx + FROM subranges + WHERE (suprev = ? AND supidx = ?) + ORDER BY listidx;""" + +class sqlstablerange(stablerange): + + _schemaversion = 0 + + def __init__(self, repo): + super(sqlstablerange, self).__init__() + self._path = repo.vfs.join('cache/evoext_stablerange_v0.sqlite') + self._cl = repo.unfiltered().changelog # (okay to keep an old one) + self._ondisktiprev = None + self._ondisktipnode = None + self._unsaveddepth = {} + self._unsavedsubranges = {} + self._fulldepth = False + + def warmup(self, repo, upto=None): + self._con # make sure the data base is loaded + try: + # samelessly lock the repo to ensure nobody will update the repo + # concurently. This should not be too much of an issue if we warm + # at the end of the transaction. + # + # XXX However, we lock even if we are up to date so we should check + # before locking + with repo.lock(): + super(sqlstablerange, self).warmup(repo, upto) + self._save(repo) + except error.LockError: + # Exceptionnally we are noisy about it since performance impact is + # large We should address that before using this more widely. + repo.ui.warn('stable-range cache: unable to lock repo while warming\n') + repo.ui.warn('(cache will not be saved)\n') + super(sqlstablerange, self).warmup(repo, upto) + + def _getdepth(self, rev): + cache = self._depthcache + if rev not in cache and rev <= self._ondisktiprev and self._con is not None: + value = None + result = self._con.execute(_querydepth, (rev,)).fetchone() + if result is not None: + value = result[0] + # in memory caching of the value + cache[rev] = value + return cache.get(rev) + + def _setdepth(self, rev, depth): + assert rev not in self._unsaveddepth + self._unsaveddepth[rev] = depth + super(sqlstablerange, self)._setdepth(rev, depth) + + def _getsub(self, rangeid): + cache = self._subrangescache + if rangeid not in cache and rangeid[0] <= self._ondisktiprev and self._con is not None: + value = None + result = self._con.execute(_queryrange, rangeid).fetchone() + if result is not None: # database know about this node (skip in the future?) + value = self._con.execute(_querysubranges, rangeid).fetchall() + # in memory caching of the value + cache[rangeid] = value + return cache.get(rangeid) + + def _setsub(self, rangeid, value): + assert rangeid not in self._unsavedsubranges + self._unsavedsubranges[rangeid] = value + super(sqlstablerange, self)._setsub(rangeid, value) + + def _inheritancepoint(self, *args, **kwargs): + self._loaddepth() + return super(sqlstablerange, self)._inheritancepoint(*args, **kwargs) + + @util.propertycache + def _con(self): + con = sqlite3.connect(self._path) + con.text_factory = str + cur = con.execute(_queryexist) + if cur.fetchone() is None: + return None + meta = con.execute(_querymeta).fetchone() + if meta is None: + return None + if meta[0] != self._schemaversion: + return None + if len(self._cl) <= meta[1]: + return None + if self._cl.node(meta[1]) != meta[2]: + return None + self._ondisktiprev = meta[1] + self._ondisktipnode = meta[2] + if self._tiprev < self._ondisktiprev: + self._tiprev = self._ondisktiprev + self._tipnode = self._ondisktipnode + return con + + def _save(self, repo): + repo = repo.unfiltered() + if not (self._unsavedsubranges or self._unsaveddepth): + return # no new data + + if self._con is None: + util.unlinkpath(self._path, ignoremissing=True) + if '_con' in vars(self): + del self._con + + con = sqlite3.connect(self._path) + con.text_factory = str + with con: + for req in _sqliteschema: + con.execute(req) + + meta = [self._schemaversion, + self._tiprev, + self._tipnode, + ] + con.execute(_newmeta, meta) + else: + con = self._con + meta = con.execute(_querymeta).fetchone() + if meta[2] != self._ondisktipnode or meta[1] != self._ondisktiprev: + # drifting is currently an issue because this means another + # process might have already added the cache line we are about + # to add. This will confuse sqlite + msg = _('stable-range cache: skipping write, ' + 'database drifted under my feet\n') + hint = _('(disk: %s-%s vs mem: %s%s)\n') + data = (meta[2], meta[1], self._ondisktiprev, self._ondisktipnode) + repo.ui.warn(msg) + repo.ui.warn(hint % data) + return + meta = [self._tiprev, + self._tipnode, + ] + con.execute(_updatemeta, meta) + + self._savedepth(con, repo) + self._saverange(con, repo) + con.commit() + self._ondisktiprev = self._tiprev + self._ondisktipnode = self._tipnode + self._unsaveddepth.clear() + self._unsavedsubranges.clear() + + def _savedepth(self, con, repo): + repo = repo.unfiltered() + data = self._unsaveddepth.items() + con.executemany(_updatedepth, data) + + def _loaddepth(self): + """batch load all data about depth""" + if not (self._fulldepth or self._con is None): + result = self._con.execute(_batchdepth) + self._depthcache.update(result.fetchall()) + self._fulldepth = True + + def _saverange(self, con, repo): + repo = repo.unfiltered() + data = [] + allranges = set() + for key, value in self._unsavedsubranges.items(): + allranges.add(key) + for idx, sub in enumerate(value): + data.append((idx, key[0], key[1], sub[0], sub[1])) + + con.executemany(_updaterange, allranges) + con.executemany(_updatesubranges, data) + + @eh.reposetup def setupcache(ui, repo): @@ -668,7 +878,7 @@ @localrepo.unfilteredpropertycache def stablerange(self): - return stablerange() + return sqlstablerange(repo) @localrepo.unfilteredmethod def destroyed(self):