[pdal] reading las is slower than liblas

[Stefan Ziegler]

Hi

I once noticed that you have to set CMAKE_BUILD_TYPE to "Release" and not
"Debug" to get a much faster reading. I think I remember that the default
setting was "Debug".

best regards
Stefan

On Mon, Jun 8, 2015 at 5:59 PM, Howard Butler <howard at hobu.co> wrote:

>
> > On Jun 8, 2015, at 9:14 AM, Luca Delucchi <lucadeluge at gmail.com> wrote:
> >
> > Hi devs,
> >
> > I'm doing some comparison between liblas and pdal and it seems to me
> > that pdal is really slower to read las files.
> >
> > Following the result of time command with the same las file:
> >
> > - liblas
> > real    0m2.145s
> > user    0m2.072s
> > sys     0m0.068s
> >
> > - pdal
> > real    0m48.900s
> > user    0m48.160s
> > sys     0m0.785s
> >
> > do you have any idea why is so slower?
> >
> > PS
> > I tested several files and it seems to me that the time of pdal is
> > equal ~20 time the result of liblas
>
> Can you ticket what you’re doing for a test that demonstrates this? I
> would expect it to be a little slower due to the fact that liblas is
> essentially just copying bytes, and PDAL’s doing some extra work, but not
> 20x.
>
> Howard
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