From: Diego Zamboni <firstname.lastname@example.org>
To: Vladimir Nikishkin <email@example.com>
Cc: Org-mode <firstname.lastname@example.org>
Subject: 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/)]
Date: Thu, 9 Jan 2020 09:45:28 +0100 [thread overview]
Message-ID: <CAGY83Ef5MHcPYMKBEfamJQzGwDEZSZzsQgKCrO9kedxZKQ6CbQ@mail.gmail.com> (raw)
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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.
On Thu, Jan 9, 2020 at 2:43 AM Vladimir Nikishkin <email@example.com>
> 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 <firstname.lastname@example.org> 於 2020年1月9日 週四 01:23 寫道：
>> Vladimir Nikishkin <email@example.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,
>> #+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)))
>> Nicolas Goaziou
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prev parent reply other threads:[~2020-01-09 8:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-14 7:04 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
2019-10-14 15:03 ` Nicolas Goaziou
[not found] ` <CA+A2iZascDYc2mZfxy_dPSm9f-+_vJ9R+kVdNW_C7MMoOimMnA@mail.gmail.com>
[not found] ` <firstname.lastname@example.org>
[not found] ` <CA+A2iZZ=gTstVgyzNqi73ysTzRnh5C4GVcmTf6EbEr5mUiRD2w@mail.gmail.com>
[not found] ` <email@example.com>
2020-01-08 2:18 ` Vladimir Nikishkin
2020-01-08 17:23 ` Nicolas Goaziou
2020-01-09 1:41 ` Vladimir Nikishkin
2020-01-09 8:45 ` Diego Zamboni [this message]
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