-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ross Patterson wrote: > Tres Seaver <[EMAIL PROTECTED]> writes: > >> Ross Patterson wrote: >>> Tres Seaver <[EMAIL PROTECTED]> writes: >>> >>>> Andreas Jung wrote: >>>>> On 23.11.2008 11:57 Uhr, Charlie Clark wrote: >>>>>> Am 23.11.2008 um 09:24 schrieb Andreas Jung: >>>>>> >>>>>>> This issue is independent of the client-side. ab2 and cmf/plone were >>>>>>> running on the same (fast) machine. >>>>>> Is this really content that is suited for the ZODB? >>>>> I am talking of the standard content-types that are available in CMF and >>>>> Plone like Document, News etc. >>>> Are you trying to proceess feed content, one document per request? You >>>> should be batching up that content, to get better amortization of the >>>> indexing overhead. >>>> >>>> You should also be checking for conflict errors: they would result in a >>>> *large* performance hit. >>> Quick question. How much of the write concurrency problem comes from >>> the fact that the ZPublisher retries the entire *request* on >>> WriteConflict instead of just trying to committing the transaction >>> again? >> It can't retry the commit: the point is that the conflict can't be >> resolved using the values read from the database at the start of the >> transaction. We have to redo the whole request, re-reading any objects >> in the context of a new transaction; otherwise, we would be back to >> "last write wins", which is a lose. > > Not really what I meant, sorry for being unclear. I meant how much of > the write performance problem comes from the overhead of redoing the > whole request, rendering templates and such? I'm just wondering if > anyone has quantified that.
I doubt anyone has done so: the results would likely be highly dependent on the specific application. Back in the day, the render-time penalty was one of the reasons I disliked self-posting forms (for updates): I preferred the "update-and-redirect" model, both to avoid rendering during / after the update, and also to avoid screwing up the browser cache with POST requests. Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 [EMAIL PROTECTED] Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJKbJZ+gerLs4ltQ4RAr3fAKCbL7zElLcQ+ay8J3vl3EvUEwX0wQCfaEPY y12fwCwskKLPZy/a0hVrbvU= =gBMJ -----END PGP SIGNATURE----- _______________________________________________ Zope-CMF maillist - Zope-CMF@lists.zope.org http://mail.zope.org/mailman/listinfo/zope-cmf See https://bugs.launchpad.net/zope-cmf/ for bug reports and feature requests