From: Alex Riesen <raa.lkml@gmail.com>
To: Johan Herland <johan@herland.net>
Cc: Johannes Schindelin <Johannes.Schindelin@gmx.de>,
git@vger.kernel.org, gitster@pobox.com, trast@student.ethz.ch,
tavestbo@trolltech.com, git@drmicha.warpmail.net,
chriscool@tuxfamily.org, spearce@spearce.org
Subject: Re: [RFC] Use a 16-tree instead of a 256-tree for storing notes
Date: Wed, 26 Aug 2009 14:05:52 +0200 [thread overview]
Message-ID: <81b0412b0908260505m233d9a5cmefdd81e1ef51a299@mail.gmail.com> (raw)
In-Reply-To: <200908261231.01616.johan@herland.net>
On Wed, Aug 26, 2009 at 12:31, Johan Herland<johan@herland.net> wrote:
> The 256-tree structure is considerably faster than storing all entries in a
This part is confusing. Was 256-tree better (as in "faster") then?
> hash_map. Also, the memory consumption of the 256-tree structure is lower
> than the hash_map, provided that you're only loading a few notes from a
> "properly fanned-out" notes tree (i.e. 100000 notes in a 2/2/36 structure).
> However, in the worst case (loading all 100000 notes), the memory usage of
> the 256-tree structure (62.64 MB) is significantly worse than the hash_map
> approach (10.25 MB).
>
> This patch modifies the 256-tree structure into a 16-tree structure. This
> significantly improves the memory situation. The result uses less memory
> than both the 256-tree structure, and the hash_map approach, with a worst
> case usage of 8.54 MB. Additionally, it seems to slightly improve the
> runtime performance as well (probably because of the improved memory usage).
next prev parent reply other threads:[~2009-08-26 12:06 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-29 2:25 [PATCHv3 0/8] RESEND: git notes Johan Herland
2009-07-29 2:25 ` [PATCHv3 1/8] Introduce commit notes Johan Herland
2009-07-29 8:52 ` Alex Riesen
2009-07-29 16:40 ` Johannes Schindelin
2009-07-30 0:50 ` Johan Herland
2009-07-30 1:14 ` Johannes Schindelin
2009-07-30 0:42 ` Johan Herland
2009-07-29 2:25 ` [PATCHv3 2/8] Add a script to edit/inspect notes Johan Herland
2009-07-29 2:25 ` [PATCHv3 3/8] Speed up git notes lookup Johan Herland
2009-07-29 2:25 ` [PATCHv3 4/8] Add an expensive test for git-notes Johan Herland
2009-07-29 2:25 ` [PATCHv3 5/8] Teach "-m <msg>" and "-F <file>" to "git notes edit" Johan Herland
2009-07-29 7:57 ` Thomas Rast
2009-07-30 1:02 ` Johan Herland
2009-07-29 2:25 ` [PATCHv3 6/8] First draft of notes tree parser with support for fanout subtrees Johan Herland
2009-07-29 16:45 ` Johannes Schindelin
2009-07-30 0:18 ` Testing performance of the notes lookup code (Was: [PATCHv3 6/8] First draft of notes tree parser with support for fanout subtrees) Johan Herland
2009-08-01 2:36 ` [RFC] First draft of 256-tree structure for storing notes Johan Herland
2009-08-13 3:00 ` [RFC] Store subtree entries in the same hash map as the note entries Johan Herland
2009-08-26 10:31 ` [RFC] Use a 16-tree instead of a 256-tree for storing notes Johan Herland
2009-08-26 12:05 ` Alex Riesen [this message]
2009-08-26 12:56 ` Johan Herland
2009-08-26 13:24 ` Alex Riesen
2009-08-26 13:27 ` Andreas Ericsson
2009-08-26 14:43 ` Johan Herland
2009-08-27 11:56 ` Johannes Schindelin
2009-07-29 2:25 ` [PATCHv3 7/8] fast-import: Add support for importing commit notes Johan Herland
2009-07-29 14:21 ` Shawn O. Pearce
2009-07-30 1:29 ` Johan Herland
2009-07-29 2:25 ` [PATCHv3 8/8] t3302-notes-index-expensive: Speed up create_repo() Johan Herland
2009-07-29 16:46 ` Johannes Schindelin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=81b0412b0908260505m233d9a5cmefdd81e1ef51a299@mail.gmail.com \
--to=raa.lkml@gmail.com \
--cc=Johannes.Schindelin@gmx.de \
--cc=chriscool@tuxfamily.org \
--cc=git@drmicha.warpmail.net \
--cc=git@vger.kernel.org \
--cc=gitster@pobox.com \
--cc=johan@herland.net \
--cc=spearce@spearce.org \
--cc=tavestbo@trolltech.com \
--cc=trast@student.ethz.ch \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).