Le vendredi 09 mars 2007 à 07:41 +0000, Xavier Calbet a écrit :
> Hi Greg,
>
> Thanks a lot for your answers. The key I was looking for was
> this mult and such functions, which operate on piddles
> without generating new ones. Your comments have really
> been helpful on this.
>
> I have run a version of mandel optimised along these lines.
> I do get a performance increase and in fact the sys time
> goes almost to zero (see figures below). Unfortunately
> the user time goes up significantly
Don't know, may be a Perl issue ?
Greg
> secs real user sys
> total=user+sys
> PDL 649.295 329.347 319.703 649.050
> PDL optimised 485.754 484.821 0.664 485.485
>
> Why is this happening? Am I doing something wrong here?
> Is there a way to get the same user time as in the straight PDL
> version (329 secs) and almost zero sys time?
> Code attached.
>
> Many thanks again,
>
> Xavier
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