From: ludo@gnu.org (Ludovic Courtès)
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel <guix-devel@gnu.org>
Subject: Re: Cuirass news
Date: Wed, 14 Feb 2018 14:43:56 +0100 [thread overview]
Message-ID: <87zi4bsn37.fsf@gnu.org> (raw)
In-Reply-To: <20180213101236.5c74e577@scratchpost.org> (Danny Milosavljevic's message of "Tue, 13 Feb 2018 10:12:36 +0100")
Hello,
Danny Milosavljevic <dannym@scratchpost.org> skribis:
> On Sat, 10 Feb 2018 12:18:56 +0100
> ludo@gnu.org (Ludovic Courtès) wrote:
>
>> Thinking about it, it wouldn’t matter that HTTP requests are processed
>> sequentially if database queries run really fast. I’m not sure if we
>> can achieve it. WDYT?
>
> That depends on how fast. But it should be possible to optimize the actual
> query (using indices, lookups are O(log N)). Also, if it's the same
> query as before, it usually will be really fast as most of the pointers
> are still where they were before.
>
> Sqlite3 already automatically created indices for all the primary keys.
>
> There's also https://www.sqlite.org/pragma.html#pragma_optimize if we need it.
>
> We can always try it with serialized database access and use a connection
> pool should it get too slow later.
My point is /latestbuilds and /queue already take several seconds on the
database that we have on berlin, which is quite big. So we have a
problem already.
I tried this:
--8<---------------cut here---------------start------------->8---
$ sudo sqlite3 /var/run/cuirass/cuirass.db
Password:
SQLite version 3.19.3 2017-06-08 14:26:16
Enter ".help" for usage hints.
sqlite> select count(*) from builds where status < 0;
636635
sqlite> select count(*) from builds inner join Derivations ON Builds.derivation = Derivations.derivation and Builds.evaluation = Derivations.evaluation
...> INNER JOIN Evaluations ON Derivations.evaluation = Evaluations.id
...> INNER JOIN Specifications ON Evaluations.specification = Specifications.repo_name;
2156003
sqlite> pragma optimize;
sqlite>
--8<---------------cut here---------------end--------------->8---
… but that doesn’t seem to have any effect, presumably because sqlite3
already optimized whatever it could.
Thoughts?
Ludo’.
next prev parent reply other threads:[~2018-02-14 13:44 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-24 22:12 Cuirass news Ludovic Courtès
2018-01-25 10:55 ` Mathieu Othacehe
2018-01-25 10:59 ` Mathieu Othacehe
2018-01-25 13:09 ` Ludovic Courtès
2018-01-26 14:30 ` Danny Milosavljevic
2018-01-27 16:01 ` Ludovic Courtès
2018-01-27 17:18 ` Danny Milosavljevic
2018-01-27 19:12 ` Danny Milosavljevic
2018-01-28 21:47 ` Ludovic Courtès
2018-01-28 22:23 ` Danny Milosavljevic
2018-01-29 9:57 ` Andy Wingo
2018-02-08 13:37 ` Ludovic Courtès
2018-02-08 16:29 ` Danny Milosavljevic
2018-02-08 22:21 ` Ludovic Courtès
2018-02-08 23:05 ` Danny Milosavljevic
2018-02-09 6:17 ` Gábor Boskovits
2018-02-09 9:41 ` Ludovic Courtès
2018-02-09 11:29 ` Danny Milosavljevic
2018-02-09 16:53 ` Ludovic Courtès
2018-02-09 17:06 ` Danny Milosavljevic
2018-02-10 11:18 ` Ludovic Courtès
2018-02-13 9:12 ` Danny Milosavljevic
2018-02-14 13:43 ` Ludovic Courtès [this message]
2018-02-14 23:17 ` Ludovic Courtès
2018-02-19 15:35 ` Danny Milosavljevic
2018-02-19 15:35 ` [PATCH] database: Simplify 'db-get-builds' Danny Milosavljevic
2018-02-19 17:52 ` [PATCH] database: db-get-builds: Inline output selection Danny Milosavljevic
2018-02-19 22:08 ` Cuirass news Danny Milosavljevic
2018-03-02 13:21 ` Ludovic Courtès
2018-03-02 22:06 ` Ludovic Courtès
2018-03-02 23:29 ` Danny Milosavljevic
2018-02-14 23:21 ` Ludovic Courtès
2018-01-25 21:06 ` Ricardo Wurmus
2018-01-26 11:12 ` Ludovic Courtès
2018-01-25 22:28 ` Danny Milosavljevic
2018-01-26 10:47 ` Ludovic Courtès
2018-01-28 12:33 ` Cuirass frontend Danny Milosavljevic
2018-01-29 17:42 ` Ludovic Courtès
2018-01-26 0:46 ` Cuirass news Danny Milosavljevic
2018-01-27 17:27 ` Danny Milosavljevic
2018-01-28 21:48 ` Ludovic Courtès
2018-01-26 17:55 ` Jan Nieuwenhuizen
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