On Sep 16, 2013, at 18:51 , Jeffrey Oleander <jgo...@yahoo.com> wrote:

>   If you want to know the total number of objects to be archived, then you 
> need to count them, at some time or another.  To count them, you need to walk 
> the object tree before you start actually archiving...  which may take a 
> significant fraction of the time it takes to archive.

I doubt that walking the object tree to count would take a significant amount 
of time, unless you have something really weird going on with your data 
structures.

For example, I recently ran some tests on keyed archiving with a 3 level tree 
of slightly more than 1M objects total.  Archiving with keyed archiver took 
>9s, unarchiving 2.6s, creating the tree 200ms and counting it 16.5ms.   

So counting the objects took less than 1% of the time of unarchiving, and less 
than 0.2% the time of archiving, in both cases the time is negligible.

Cheers,

Marcel



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