cPickle asymptotic performance?

Calvin Spealman ironfroggy at socialserve.com
Thu Jun 12 21:07:22 CEST 2008


If you are getting to the point where your data is large enough to  
really care about the speed of cPickle, then maybe its time you moved  
past pickles for your storage format? 2.5 includes sqlite, so you  
could persist them in a nice, indexed table or something. Just a  
suggestion.

On Jun 12, 2008, at 2:25 PM, Eric Jonas wrote:

> Hello,
>
> I've done some benchmarking while attempting to serialize my (large)
> graph data structure with cPickle; I'm seeing superlinear performance
> (plotting it seems to suggest n^2 where n is the number of nodes of my
> graph), in the duration of the pickle.dump calls and I can't quite
> figure out why. The connectivity of the graph is such that the  
> number of
> nodes is ~ number of edges, so I don't think this is a problem of edge
> count secretly growing > O(n). Is cPickle's behavior known to be O 
> (n^2)?
> Does anyone have any generic tips for speeding up cPickle?
> 	
> Thanks,
> 		...Eric
>
>
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