Mercurial > hg
changeset 4269:73c918c71300
changelog: optimize delayed updates for clone vs pull
pull index updates get redirected to memory, then appended on finalize
clone index updates get sent to 00changelog.i.a, then renamed on finalize
| author | Matt Mackall <mpm@selenic.com> |
|---|---|
| date | Sat, 24 Mar 2007 02:47:33 -0500 |
| parents | f38f90a177dc |
| children | cb6107f78b92 |
| files | mercurial/changelog.py tests/test-hup.out |
| diffstat | 2 files changed, 17 insertions(+), 5 deletions(-) [+] |
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--- a/mercurial/changelog.py Sat Mar 24 02:45:08 2007 -0500 +++ b/mercurial/changelog.py Sat Mar 24 02:47:33 2007 -0500 @@ -85,27 +85,39 @@ def delayupdate(self): "delay visibility of index updates to other readers" self._realopener = self.opener - self.opener = self._appendopener + self.opener = self._delayopener + self._delaycount = self.count() self._delaybuf = [] + self._delayname = None def finalize(self, tr): "finalize index updates" self.opener = self._realopener - if self._delaybuf: + # move redirected index data back into place + if self._delayname: + util.rename(self._delayname + ".a", self._delayname) + elif self._delaybuf: fp = self.opener(self.indexfile, 'a') fp.write("".join(self._delaybuf)) fp.close() del self._delaybuf + # split when we're done self.checkinlinesize(tr) - def _appendopener(self, name, mode='r'): + def _delayopener(self, name, mode='r'): fp = self._realopener(name, mode) + # only divert the index if not name == self.indexfile: return fp + # if we're doing an initial clone, divert to another file + if self._delaycount == 0: + self._delayname = fp.name + return self._realopener(name + ".a", mode) + # otherwise, divert to memory return appender(fp, self._delaybuf) def checkinlinesize(self, tr, fp=None): - if self.opener == self._appendopener: + if self.opener == self._delayopener: return return revlog.checkinlinesize(self, tr, fp)
--- a/tests/test-hup.out Sat Mar 24 02:45:08 2007 -0500 +++ b/tests/test-hup.out Sat Mar 24 02:47:33 2007 -0500 @@ -4,4 +4,4 @@ killed! transaction abort! rollback completed -.hg/00changelog.i .hg/journal.dirstate .hg/requires .hg/store .hg/store/00changelog.i +.hg/00changelog.i .hg/journal.dirstate .hg/requires .hg/store .hg/store/00changelog.i .hg/store/00changelog.i.a