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Cut down number of sys calls during filelog reads

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When the cache is stored on a filesystem, excessive stat calls can slow
mercurial updates down dramatically. This reduces it to a single open call for
the cache location and if that fails, a single open call for the local location.
This commit is contained in:
Durham Goode 2013-09-09 10:23:29 -07:00
parent c17ec690c9
commit 3619a1911d
2 changed files with 14 additions and 9 deletions
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15
remotefilelog/remotefilelog.py
View File

@ -56,9 +56,6 @@ class remotefilelog(object):
self.repo = repo
self.localpath = os.path.join(opener.vfs.base, 'data')
if not os.path.exists(self.localpath):
os.makedirs(self.localpath)
self.version = 1
def read(self, node):
@ -253,17 +250,23 @@ class remotefilelog(object):
"""reads the raw file blob from disk, cache, or server"""
cachekey = fileserverclient.getcachekey(self.filename, id)
cachepath = os.path.join(fileserverclient.client.cachepath, cachekey)
if os.path.exists(cachepath):
try:
return _readfile(cachepath)
except IOError:
pass
localkey = fileserverclient.getlocalkey(self.filename, id)
localpath = os.path.join(self.localpath, localkey)
if os.path.exists(localpath):
try:
return _readfile(localpath)
except IOError:
pass
fileserverclient.client.prefetch(self.repo, [(self.filename, id)])
if os.path.exists(cachepath):
try:
return _readfile(cachepath)
except IOError:
pass
raise error.LookupError(id, self.filename, _('no node'))

8
remotefilelog/shallowrepo.py
View File

@ -9,9 +9,7 @@ from mercurial.node import hex, nullid, bin
from mercurial.i18n import _
from mercurial import localrepo, context, mdiff, util
from mercurial.extensions import wrapfunction
import remotefilelog
import remotefilectx
import fileserverclient
import remotefilelog, remotefilectx, fileserverclient, os
def wraprepo(repo):
class shallowrepository(repo.__class__):
@ -143,3 +141,7 @@ def wraprepo(repo):
wrapfunction(repo.dirstate, 'status', status)
repo.__class__ = shallowrepository
localpath = os.path.join(repo.sopener.vfs.base, 'data')
if not os.path.exists(localpath):
os.makedirs(localpath)