Am 14.04.2010, 04:39 Uhr, schrieb Tim Peters <tim.pet...@gmail.com>: > [Nitro] >> ... >> I wonder if _commit is really *that* slow > > Six years ago I timed factor-of-100 speed differences due to using MS > _commit() on WinXP at the time: > > https://mail.zope.org/pipermail/zodb-dev/2004-July/007720.html > >> or if there's another (faster) function which can be called... > > No MS function that does the same thing.
Seems like ZODB has a long history of discussions on this matter: http://www.mail-archive.com/zodb-dev@zope.org/msg01874.html There's even a proposal for improvement in that thread, also on the wiki: http://wiki.zope.org/ZODB/FsyncBehaviourSetting What I don't really get is why you should never use "None" on windows. As far as I can judge from the various transaction rates in the thread Tim mentioned, fsync is just a no-op on linux anyways (depending on the specific file system of course). I am almost tempted to do os.fsync = lambda fd: 0 and rely on yesterday's backup. 0.49 j/k. Postgres has something similar as the proposal suggested: http://www.postgresql.org/docs/8.1/interactive/runtime-config-wal.html -Matthias _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
