Re: Bug: org-babel-expand-noweb-references is very slow [9.1.9 (release_9.1.9-65-g5e4542 @ /usr/share/emacs/26.3/lisp/org/)]

[Vladimir Nikishkin <lockywolf@gmail.com>]

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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 <mail@nicolasgoaziou.fr> 於 2020年1月9日 週四 01:23 寫道：

> Hello,
>
> Vladimir Nikishkin <lockywolf@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
>

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