[Liblas-devel] Cached Reader bottleneck

[Howard Butler]

On Oct 21, 2010, at 3:57 PM, Gary Huber wrote:

> Mateusz Loskot wrote:
> 
>> 
>> I think we should extract a lightweight LASHeaderReader from LASReader
>> for uses cases like the above, to avoid setting up complete reading engine if user wants to get header only.
> 
> I absolutely agree. In cases where the index is stored in a separate file I am initializing two Readers - one to read the index, which is only a header but has the number of points specified in it even though they aren't in the index file, and one Reader for the file with the actual point data. So right there - two huge arrays one of which will never be used at all.

I think it would be sufficient to have both the CachedReaderImpl and the regular ReaderImpl make sure that they don't do any big initialization of things like the mask arrays until they try to read their first point.  I will take this as a task for next week.