Re: [ZODB-Dev] increasing order of oids?
On Thu, Aug 13, 2009 at 2:01 PM, Shane Hathaway wrote: > Jürgen Herrmann wrote: >> is there a strict requirement for oids to be increasing? > > No, but obviously there is a strict requirement that new_oid() return > unique OIDs. > >> if RadosStorage could pre-allocate oids in batches of thousands, that >> would probably give me a big performance win, or to put it the other >> way round: rados is not designed to be used for such time-critical and >> at the same time completely synced operations. and getting new oids >> will happen often... > > ZEO also allocates OIDs in large batches, I believe. Yup. Note that technically, IODs can be any string, however lots of tools assume they are 8-byte strings, which gives plenty of room for wastage when allocating them. Jim -- Jim Fulton ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] increasing order of oids?
Jürgen Herrmann wrote: > is there a strict requirement for oids to be increasing? No, but obviously there is a strict requirement that new_oid() return unique OIDs. > if RadosStorage could pre-allocate oids in batches of thousands, that > would probably give me a big performance win, or to put it the other > way round: rados is not designed to be used for such time-critical and > at the same time completely synced operations. and getting new oids > will happen often... ZEO also allocates OIDs in large batches, I believe. Shane ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
[ZODB-Dev] increasing order of oids?
hi there! is there a strict requirement for oids to be increasing? having read a ton of code my head is not so sure anymore, though i can't remember seeing a requirement for such anywhere in the code. if RadosStorage could pre-allocate oids in batches of thousands, that would probably give me a big performance win, or to put it the other way round: rados is not designed to be used for such time-critical and at the same time completely synced operations. and getting new oids will happen often... best regards, jürgen -- >> XLhost.de - eXperts in Linux hosting ® << XLhost.de GmbH Jürgen Herrmann, Geschäftsführer Boelckestrasse 21, 93051 Regensburg, Germany Geschäftsführer: Volker Geith, Jürgen Herrmann Registriert unter: HRB9918 Umsatzsteuer-Identifikationsnummer: DE245931218 Fon: +49 (0)800 XLHOSTDE [0800 95467833] Fax: +49 (0)800 95467830 WEB: http://www.XLhost.de IRC: #xlh...@irc.quakenet.org ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
