Re: getFolderContents: serious performance problem

Hi

Yves Bastide a écrit :
> Hi,
> 
> CPSDefault.utils.getFolderContents causes a big performance problem on a 
> site
> we installed. A subsection containing about 4000 documents takes some 40
> secondes to display for a 'SectionReader' user, versus 7 seconds for the 
> Manager.
> 
> The profiler points out one main culprit: getRolesInContext (and also
> DateTime's _parse_args). (*)
> 
> My first try was to give the View permission to the Authenticated role 
> in the
> subsection instead of using a SectionReader local role, but there wasn't 
> much
> improvement. After reading CPSDefault.utils.filterContents, the reason 
> is obvious:
> {{{
>         # filter non effective or expired published content
>         if not _checkPermission(ModifyPortalContent, item):
>             review_state = wtool.getInfoFor(item, 'review_state', 
> 'nostate')
>             if review_state == 'published':
>                 doc = item.getContent()
>                 if now < doc.effective() or now > doc.expires():
>                     continue
> }}}
> 
> (_checkPermission could be pushed down in the tests; but I'm not sure 
> whether
> that would be much more efficient. The dates tests may also be costly.)
> 
> After my colleague remarked that searches were much quicker (~ 5 
> seconds, and
> with a more complex display), we tried to force using
> getCatalogFolderContents, and lo! folder_view became 8 times faster.
> 
> So I'd like to know
> 
> * How to systematically use getCatalogFolderContents instead of
> getFolderContents (in a clean way :) ) -- I'm not yet comfortable with CPS
> views' many levels of inclusion
Using the ZMI add a boolean property to the portal named 
'use_catalog_for_folder_contents' with a True value.

> * Why it's not the case already (I've had incomplete indexes, but assume 
> it's
> my fault)
It is a bit slower if you have only few items in a folder.

> * Bonus question: can one sort on several indexes -- i.e. some of my 
> documents
> have a specific field which should be used as a default sort key; how to 
> get
> also documents of other types?
I think you need to replace the default sort on position_in_container 
with 2 sort keys: your new index first then position_in_container.

Regards

ben
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