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From: "Ludovic Courtès" <ludo@gnu.org>
To: Arun Isaac <arunisaac@systemreboot.net>
Cc: mail@ambrevar.xyz, 39258@debbugs.gnu.org, zimon.toutoune@gmail.com
Subject: [bug#39258] [PATCH 0/4] Xapian for Guix package search
Date: Thu, 05 Mar 2020 17:46:01 +0100	[thread overview]
Message-ID: <87h7z292d2.fsf@gnu.org> (raw)
In-Reply-To: <20200227204150.30985-1-arunisaac@systemreboot.net> (Arun Isaac's message of "Fri, 28 Feb 2020 02:11:46 +0530")

Hello Arun,

Arun Isaac <arunisaac@systemreboot.net> skribis:

> * Speed improvement
>
> Despite search-package-index in gnu/packages.scm taking only around 1.5ms, I
> see an overall speedup in `guix search` of only a factor of 2 -- from around
> 2s to around 1s. I wonder what else in `guix search` is taking up so much
> time.

Note that ‘guix search’ time is largely dominated by I/O.  On my laptop,
I get (first measurement is cold cache, second one is warm cache):

--8<---------------cut here---------------start------------->8---
$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
$ time guix search foo >/dev/null

real    0m2.631s
user    0m1.134s
sys     0m0.124s
$ time guix search foo >/dev/null

real    0m0.836s
user    0m1.027s
sys     0m0.053s
--8<---------------cut here---------------end--------------->8---

It’s hard to do better on the warm cache case because at this level,
there may be other things to optimize having little to do with searching
itself.

Note that this is on an SSD; the cold-cache case must be worse on NFS or
on a spinning disk, and there we could gain a lot.

I think we should weigh the pros and cons on all these aspects: speed,
complexity and maintenance cost, search result quality, search features,
etc.

Thanks,
Ludo’.

PS: I have not yet looked at the whole series as I’m just coming back to
    the keyboard.  :-)

  parent reply	other threads:[~2020-03-05 16:47 UTC|newest]

Thread overview: 126+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23 19:51 [bug#39258] Faster guix search using an sqlite cache Arun Isaac
2020-01-29 23:33 ` zimoun
2020-01-30 13:48   ` Arun Isaac
2020-01-31 12:48     ` zimoun
2020-02-02 21:16       ` Arun Isaac
2020-02-04 10:19         ` zimoun
2020-02-06  1:58           ` Arun Isaac
2020-02-11 16:29             ` Ludovic Courtès
2020-02-11 18:21               ` zimoun
2020-02-11 18:39                 ` Ludovic Courtès
2020-02-11 19:07                   ` Arun Isaac
2020-02-11 20:20                     ` zimoun
2020-02-15 14:50                     ` Arun Isaac
2020-02-11 20:13                   ` zimoun
2020-02-27 20:41 ` [bug#39258] [PATCH 0/4] Xapian for Guix package search Arun Isaac
2020-02-27 20:41   ` [bug#39258] [PATCH 1/4] gnu: Add guile-xapian Arun Isaac
2020-03-03 16:29     ` zimoun
2020-02-27 20:41   ` [bug#39258] [PATCH 2/4] build-self: Add guile-xapian to Guix dependencies Arun Isaac
2020-02-27 20:41   ` [bug#39258] [PATCH 3/4] gnu: Generate xapian package search index Arun Isaac
2020-02-28  8:04     ` Pierre Neidhardt
2020-03-05 20:26       ` Arun Isaac
2020-03-03 18:29     ` zimoun
2020-02-27 20:41   ` [bug#39258] [PATCH 4/4] gnu: Use xapian index for package search Arun Isaac
2020-02-28  8:11     ` Pierre Neidhardt
2020-03-03 19:21     ` zimoun
2020-03-03 19:51       ` zimoun
2020-02-28  8:13   ` [bug#39258] [PATCH 0/4] Xapian for Guix " Pierre Neidhardt
2020-02-28 12:39     ` zimoun
2020-02-28 12:49       ` Pierre Neidhardt
2020-02-28 15:36     ` Arun Isaac
2020-02-28 16:04       ` Arun Isaac
2020-03-02 18:37         ` zimoun
2020-03-02 19:13           ` zimoun
2020-03-03 20:04             ` zimoun
2020-02-29  8:25       ` Arun Isaac
2020-03-02 18:27         ` zimoun
2020-02-28 12:36   ` zimoun
2020-03-05 16:46   ` Ludovic Courtès [this message]
2020-03-07 13:31 ` [bug#39258] [PATCH v2 0/3] " Arun Isaac
2020-03-07 13:31   ` [bug#39258] [PATCH v2 1/3] build-self: Add guile-xapian to Guix dependencies Arun Isaac
2020-03-09 18:14     ` zimoun
2020-03-09 23:40     ` Jonathan Brielmaier
2020-03-10  5:24       ` Arun Isaac
2020-03-07 13:31   ` [bug#39258] [PATCH v2 2/3] gnu: Generate Xapian package search index Arun Isaac
2020-03-09 18:19     ` zimoun
2020-03-07 13:31   ` [bug#39258] [PATCH v2 3/3] gnu: Use Xapian index for package search Arun Isaac
2020-03-07 20:33   ` [bug#39258] [PATCH v2 0/3] Xapian for Guix " Ludovic Courtès
2020-03-08  9:01     ` Arun Isaac
2020-03-08 11:33       ` Ludovic Courtès
2020-03-08 20:27         ` Arun Isaac
2020-03-09  7:42           ` Pierre Neidhardt
2020-03-09 12:50             ` zimoun
2020-03-09 10:35           ` Ludovic Courtès
2020-03-10 14:17             ` Arun Isaac
2020-03-10 14:33               ` zimoun
2020-03-11 13:50               ` Ludovic Courtès
2020-03-13  5:37                 ` Arun Isaac
2020-03-15 20:40                   ` Ludovic Courtès
2020-03-09  7:50         ` Pierre Neidhardt
2020-03-09 10:28           ` Ludovic Courtès
2020-03-09 13:03             ` zimoun
2020-03-09 12:53           ` zimoun
2020-03-09 12:47         ` zimoun
2020-03-09 12:40       ` zimoun
2020-03-09 12:34     ` zimoun
2020-03-08 20:27   ` zimoun
2020-03-08 20:40     ` Arun Isaac
2020-03-09 12:28   ` zimoun
2020-03-27 16:26 ` [bug#39258] [PATCH v3 0/3] Package metadata cache for guix search Arun Isaac
2020-03-27 16:26   ` [bug#39258] [PATCH v3 1/3] guix: Generate package metadata cache Arun Isaac
2020-04-24 20:48     ` Ludovic Courtès
2020-04-26  9:48       ` zimoun
2020-04-26 14:35         ` Ludovic Courtès
2020-04-26 14:54           ` Pierre Neidhardt
2020-04-26 15:33             ` Ludovic Courtès
2020-04-26 15:05           ` zimoun
2020-03-27 16:26   ` [bug#39258] [PATCH v3 2/3] guix: Search " Arun Isaac
2020-04-24 20:58     ` Ludovic Courtès
2020-03-27 16:26   ` [bug#39258] [PATCH v3 3/3] guix: Use package metadata cache for package search Arun Isaac
2020-04-24 21:03     ` Ludovic Courtès
2020-04-05 14:08   ` [bug#39258] [PATCH v3 0/3] Package metadata cache for guix search Ludovic Courtès
2020-04-24 21:05   ` Ludovic Courtès
2020-04-26  3:54 ` [bug#39258] benchmark search: default vs v2 vs v3 zimoun
2020-04-26  7:29   ` Pierre Neidhardt
2020-04-26 15:49   ` Ludovic Courtès
2020-04-26 17:01     ` zimoun
2020-04-26 20:22       ` Ludovic Courtès
2020-04-30 13:10     ` zimoun
2020-05-03 15:01 ` [bug#39258] [PATCH v4 0/3] Faster cache generation (similar as v3) zimoun
2020-05-03 15:01   ` [bug#39258] [PATCH v4 1/3] DRAFT packages: Add fields to packages cache zimoun
2020-05-03 15:01   ` [bug#39258] [PATCH v4 2/3] DRAFT packages: Add new procedure 'fold-packages*' zimoun
2020-05-03 15:01   ` [bug#39258] [PATCH v4 3/3] DRAFT guix package: Use cache in 'find-packages-by-description' zimoun
2020-05-03 16:43   ` [bug#39258] [PATCH v4 0/3] Faster cache generation (similar as v3) Ludovic Courtès
2020-05-03 18:10     ` zimoun
2020-05-03 19:49       ` Ludovic Courtès
2020-06-01  0:00 ` [bug#39258] [PATCH 0/4] Optimize guix search Arun Isaac
2020-06-01  0:00   ` [bug#39258] [PATCH 1/4] ui: Cut off search early if any regexp does not match Arun Isaac
2020-06-09  8:29     ` Ludovic Courtès
2020-06-01  0:00   ` [bug#39258] [PATCH 2/4] ui: Use string matching with literal search strings Arun Isaac
2020-06-09  8:33     ` Ludovic Courtès
2020-06-09  9:55       ` zimoun
2020-06-13 12:37       ` Arun Isaac
2020-06-13 13:36         ` zimoun
2020-06-13 17:21           ` Arun Isaac
2020-06-14 19:14             ` zimoun
2020-06-13 19:32         ` Ludovic Courtès
2020-06-15 20:18           ` Arun Isaac
2020-06-01  0:00   ` [bug#39258] [PATCH 3/4] ui: Do not translate package synopsis a second time Arun Isaac
2020-06-09  8:33     ` Ludovic Courtès
2020-06-01  0:00   ` [bug#39258] [PATCH 4/4] ui: Use package-description-string Arun Isaac
2020-06-09  8:34     ` Ludovic Courtès
2020-06-01  1:25   ` [bug#39258] [PATCH v5 0/4] Optimize guix search zimoun
2020-06-01  2:24     ` Arun Isaac
2020-06-01 10:01     ` zimoun
2020-06-01 10:11 ` [bug#39258] KMP string search algorithm? zimoun
2020-06-01 22:24   ` Leo Famulari
2020-06-01 23:48     ` Arun Isaac
2020-06-02  8:49       ` Ludovic Courtès
2021-07-15  7:33 ` [bug#39258] [PATCH v6 0/2] DRAFT "guix search" performances zimoun
2021-07-15  7:33   ` [bug#39258] [PATCH v6 1/2] DRAFT packages: Add fields to packages cache zimoun
2021-07-17  8:31     ` Arun Isaac
2021-07-23 15:30       ` Ludovic Courtès
2021-08-17 14:03         ` zimoun
2021-07-15  7:33   ` [bug#39258] [PATCH v6 2/2] DRAFT scripts: package: Use cache in 'find-packages-by-description' zimoun
2021-07-23 15:43   ` [bug#39258] [PATCH v6 0/2] DRAFT "guix search" performances Ludovic Courtès
2021-08-20 15:42     ` zimoun

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