[Zope-CMF] cmf zpt_generic/search - sequence_length is very slow for large collections, len () is much faster.

[Florent Guillaume]

Henryk Paluch  <hpaluch at gitus.cz> wrote:
> Hi!
> 
> >batch_obj.sequence_length returns the length of all the results.
> >
> >len(batch_obj) returns only the length of the current batch slice.
> >Code is in ZTUtils/Batch.py
> >  
> >
> Agreed, but I do
> len(items) but not len(batch_obj) :

Ah sorry I missed that.

> items = ctool.searchResults(kw)
> batch_obj = Batch(items, 25, b_start, orphan=1)
> length = batch_obj.sequence_length
> 
> ### my guess: len(items)==batch_obj.sequence_length
> ###    - but len(items) is much faster.

Well then that's strange, because in the end batch_obj.sequence_length
does just call lazily len(items). From reading the code I think there
shouldn't be any speed difference. Are you sure about your measurements?

Florent

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Florent Guillaume, Nuxeo (Paris, France)   CTO, Director of R&D
+33 1 40 33 71 59   http://nuxeo.com   fg at nuxeo.com