On 2 Jan 98 at 18:20, Laurent Mirabito wrote:
> Hello ,
>
> I made a fit of a Landau distribution. To do this I translate the
> cernlib DENLAN function to C++ and load it with
>
> .L denlan.C
>
> and work as it is explained in the tutorials.
>
> It works but it's very slow compare to PAW ( > 5 min / few seconds)
>
> Is there any explanation to this ? I tried to make a library with a
> compile version of the function but I didn't find any way to load
> it...
>
You did apply C++ INTERPETER. It MUST be slow. To get a "normal"
speed" you should apply your local "native" compiler, create
dynamic/share library and load the last, then proceed.
This means you should use the "pre-compiled" binary code
optimized for you particular hardware but the SOURCE one.
I'd like to say that this > 5 min sounds as a GREAT number for
the interpreted code by the way.
See ROOT/test subdirectory for Makefile examples creating the share
libraries and DLLs.
Reading http://root.cern.ch/root/CintGenerator.html may help too.
With my best regards,
Valery
=================================================================
Dr. Valeri Faine (Fine)
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