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 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
mandel_optimised.pl
Description: Perl program
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