From: David Kastrup <dak@gnu.org>
To: git@vger.kernel.org
Subject: Re: diffcore-rename performance mode
Date: Tue, 25 Sep 2007 21:32:31 +0200 [thread overview]
Message-ID: <86641y4k34.fsf@lola.quinscape.zz> (raw)
In-Reply-To: 20070925190640.GA4613@coredump.intra.peff.net
Jeff King <peff@peff.net> writes:
> On Tue, Sep 25, 2007 at 12:38:43PM -0400, Jeff King wrote:
>
>>[...]
>>
>> What is most confusing is why the 'somefree' case performs so badly,
>> since we should just be using the cnt_data. I'll see if gprof can shed
>
> OK, I found the problem. estimate_similarity calls
> diff_populate_filespec each time, even if we already have the cnt_data,
> which leads to recomputing the blob contents from deltas. Oops.
>
> Fixing this, the correct numbers are:
>
> | stock | nofree | old somefree | fixed somefree
> -----------------|-----------------------------------------------
> user time (s) | 76.78 | 16.96 | 46.26 | 16.99
> peak memory (Kb) | 52300 | 66796 | 59156 | 57328
>
> So now we're at a 4.5x speedup for about 10% extra memory usage. Patch
> will follow.
Sounds good except when we happen to just hit the "memory working set
exceeds physical memory" sweet spot. But the odds are much better
than for "nofree".
--
David Kastrup
next prev parent reply other threads:[~2007-09-25 19:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-18 8:23 diffcore-rename performance mode Jeff King
2007-09-18 8:49 ` Junio C Hamano
2007-09-18 8:54 ` Jeff King
2007-09-18 8:58 ` Junio C Hamano
2007-09-18 9:01 ` Jeff King
2007-09-18 9:17 ` Junio C Hamano
2007-09-18 11:20 ` Johannes Schindelin
2007-09-25 16:38 ` Jeff King
2007-09-25 19:06 ` Jeff King
2007-09-25 19:10 ` Andreas Ericsson
2007-09-25 19:32 ` David Kastrup [this message]
2007-09-25 19:52 ` Jeff King
2007-09-18 22:12 ` Linus Torvalds
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
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=86641y4k34.fsf@lola.quinscape.zz \
--to=dak@gnu.org \
--cc=git@vger.kernel.org \
/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.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
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 read-only IMAP folder(s) and NNTP newsgroup(s).