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Re: 04/06: profiles: Generate database file for man pages.

From: Maxim Cournoyer
Subject: Re: 04/06: profiles: Generate database file for man pages.
Date: Sat, 15 Apr 2017 09:25:10 +0900
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Hello myglc2,

myglc2 <address@hidden> writes:

> On 04/10/2017 at 10:22 Maxim Cournoyer writes:
>> Hi myglc2!
>> On Mon, Apr 10, 2017 at 2:28 AM, myglc2 <address@hidden> wrote:
>>> On 04/05/2017 at 16:56 Ludovic Courtès writes:
>>> > civodul pushed a commit to branch master
>>> > in repository guix.
>>> >
>>> > commit a0b87ef8ec7735aa42cf35d380e9cff04f3236f3
>>> > Author: Maxim Cournoyer <address@hidden>
>>> > Date: Wed Apr 5 01:09:22 2017 -0700
>>> [...]
>>> So now q'guix package -m' produces messages like ...
>>> guix package -m g1.scm
>>> installing new manifest from 'g1.scm' with 22 entries
>>> substitute: updating list of substitutes from 
>>> ''... 100.0%
>>> The following derivations will be built:
>>> /gnu/store/smyjh63avay2gb6yq47h3hrlyxfrsajp-profile.drv
>>> /gnu/store/ygp7n87177fngqqpb5l5bkkba5cawcvh-gtk-icon-themes.drv
>>> /gnu/store/wrad8m1vhck9bb7dzqqlxb03rq1ifsm8-gtk-im-modules.drv
>>> /gnu/store/qv12155lx8y195my98970mmfawqpnrcs-info-dir.drv
>>> /gnu/store/ndiq7ccmi32rlxdyf52f506jil0zn9p0-ca-certificate-bundle.drv
>>> /gnu/store/90gzasiixp9np5m4nn28vbfqd1zd5azq-fonts-dir.drv
>>> /gnu/store/3l8kl1b438qr3yk2qca4pzvlpv04q7rc-xdg-mime-database.drv
>>> /gnu/store/2brridy714shmik1zksysik36kn2iwsf-manual-database.drv
>>> creating manual page database for 23 packages...
>>> 22 packages in profile
>>> address@hidden ~/src$
>>> And... watching this, it seems like a long time between ...
>>> creating manual page database for 23 packages...
>>> ... and ...
>>> 22 packages in profile
>>> Does it really take this long? If not, can we close the message ...
>> FWIR it is CPU bound, so your mileage will vary; in my case on an old
>> low-power laptop it can take a few seconds for ~65 packages.
> 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]:

--8<---------------cut here---------------start------------->8---
time guix build --check 
--8<---------------cut here---------------end--------------->8---

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?

If you are interested in digging into this further, you could enable
debug output for the man-db command used by manual-database profile hook
defined in (guix profiles) by replacing the "--quiet" option by
--debug. This way you'd see everything man-db might be complaining about.


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