Hi Vladimir, The main difference I have noticed is that you can have multiple blocks with the same :noweb-ref header argument, and they will be concatenated on tangle. I use this in some of my files to progressively build a block of code which is then referenced somewhere else. With #+name, you can have only one block with each name, the others are discarded (can't remember if it's the first or the last one that gets used).
I guess this is also why :noweb-ref tangling is slow, since all blocks need to be scanned and put together. --Diego On Thu, Jan 9, 2020 at 2:43 AM Vladimir Nikishkin <lockyw...@gmail.com> wrote: > Ouch, that was unexpected. > > The manual for my version only includes four mentions if the noweb-ref > header argument. Is it becoming deprecated? > > What does "apparently don't need" actually mean? That is, when should I > use the name, and when the header argument? What can the header argument do > that the name cannot? > > > Nicolas Goaziou <m...@nicolasgoaziou.fr> 於 2020年1月9日 週四 01:23 寫道： > >> Hello, >> >> Vladimir Nikishkin <lockyw...@gmail.com> writes: >> >> > I am attaching the file in which tangling is still slow. >> > >> > The file is quite big, but that alone doesn't seem to be the reason >> > for slowliness (I tried adding 1M-long words in the random places of >> > the previous mwe). >> > >> > You can see the result by C-c C-v C-v'ing the code block at the >> > "Ramanujan numbers" heading. >> > >> > Below is the profiler report for C-c C-v C-v'ing.with the heaviest >> > blocks expanded: >> >> This is because you're using :noweb-ref, which _is_ slow, although you >> apparently don't need it in the document. Use name keyword instead, >> e.g., >> >> #+name: primetest >> #+begin_src scheme :exports both :results output >> (define (smallest-divisor n) >> (find-divisor n 2)) >> (define (find-divisor n test-divisor) >> (cond ((> (square test-divisor) n) n) >> ((divides? test-divisor n) test-divisor) >> (else (find-divisor n (+ test-divisor 1))))) >> (define (divides? a b) (= (remainder b a) 0)) >> >> (define (prime? n) >> (= n (smallest-divisor n))) >> #+end_src >> >> >> Regards, >> >> -- >> Nicolas Goaziou >> >
