Re: [Boost-users] How to improve property_tree performance

Subject: Re: [Boost-users] How to improve property_tree performance
From: Sebastian Redl (sebastian.redl_at_[hidden])
Date: 2010-10-13 04:09:12

On 13.10.2010 09:35, Bo Jensen wrote:
> Hi,
> I have a fairly easy record structure which I am writing to xml using
> property_tree. I am trying to figure out how to do it better, since
> the current time spend building the tree is too high.
>
> I do the following :
>
>      wiptree pt;
>      wiptree&tvars = pt.add(L"some.recordname",L"");
>
>      for( int i = 0; i<  somenumber /*say 60K*/; ++i )
>      {
>        wiptree&curtree = tvars.add(L"someitem",L"");
>
>        curtree.add(L"<xmlattr>.name",L"some_attribute");
>
>        ...
>      }
>
> To me this seems reasonable. Is there a faster way to do this ? Since
> I just want to write it out and it's quite simple, I could avoid using
> property_tree and write the xml file manually. But since I read it in
> later with property_tree, then for maintainability I would like to
> read and write with the same method.
>    
I've never done a performance analysis of PTree (I hardly have time to 
get the docs up to date with the actual library), so I don't know what 
is fast and what is slow. PTree is definitely not a fast library. I have 
some ideas about how to make it faster, but that would take essentially 
a reimplementation of the ptree class.

You might want to try to use only push_back() instead of add(), though. 
That incurs fewer lookups and might thus improve performance.

Sebastian