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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Performance of the man page database generation
Date: Thu, 20 Apr 2017 11:29:39 +0200
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In-Reply-To: <87a87ibjq1.fsf@gmail.com> (Maxim Cournoyer's message of "Sat, 15
	Apr 2017 09:25:10 +0900")
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To: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Cc: guix-devel <guix-devel@gnu.org>, myglc2 <myglc2@gmail.com>

Hello,

Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:

> myglc2 <myglc2@gmail.com> writes:

[...]

>> It is taking more like 50 seconds on my 3.4 Ghz server for 33 packages.
>>
>>> I wonder why the odd package count mismatch (23 vs 22) ?
>>
>> That's my fault. I cut and pasted from two different runs. SORRY! ;-)
>>
>
> OK! No problem; thanks for clarifying it!
>
>>> I don't recall observing this while testing (maybe it only happens
>>> when using the -m option) ?
>>
>> No, I get the same effect w/ 'guix package -r foo.
>
> 50 seconds for 33 packages on such a powerful machine seems abnormal,
> unless you have a specific package(s) which would install an unusually
> large amount of manual pages (which would take more time to be indexed).
>
> Ludovic had a way to time the generation of the manual-database
> derivation; he was using something like [0]:
>
> time guix build --check /gnu/store/rkri628apz2a2i2jvav11ylv2736fvv3-manua=
l-database.drv
>
> Notice that you need the derivation (.drv) of manual-database rather
> than the store item ending by manual-database. Unfortunately I'm not
> aware of how we can easily find the derivation of the corresponding
> manual-database store item used by the profile (as can be found by: guix
> gc -R $(realpath $HOME/.guix-profile) | grep manual-database).
>
> Maybe Ludovic can enlight us?

You can see those .drv names when building the profile.  So you just
need to copy/paste them and run =E2=80=9Cguix build --check=E2=80=9D above.

If you have the profile but not its .drv, you can find out what the .drv
for that profile was but there=E2=80=99s no command-line interface for that=
 (you
have to use =E2=80=98valid-derivers=E2=80=99 from (guix store).)

HTH,
Ludo=E2=80=99.