From: Matt Mackall <mpm@selenic.com>
To: Jeff Garzik <jeff@garzik.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Git Mailing List <git@vger.kernel.org>,
bcrl@kvack.org
Subject: Re: cleaner/better zlib sources?
Date: Thu, 15 Mar 2007 20:14:57 -0500 [thread overview]
Message-ID: <20070316011457.GA4892@waste.org> (raw)
In-Reply-To: <45F9EED5.3070706@garzik.org>
On Thu, Mar 15, 2007 at 09:11:49PM -0400, Jeff Garzik wrote:
> Linus Torvalds wrote:
> >Now, it's possible that I'm just wrong, but the instruction-level profile
> >really did pinpoint the "look up state branch pointer and jump to it" as
> >some of the hottest part of that function. Which is just *evil*. You can
>
> ISTR there are a bunch of state transitions per byte, which would make
> sense that it shows up on profiles.
Yep, not surprising.
> >Now, I'm just wondering if anybody knows if there are better zlib
> >implementations out there? This really looks like it could be a noticeable
> >performance issue, but I'm lazy and would be much happier to hear that
> >somebody has already played with optimizing zlib. Especially since I'm not
> >100% sure it's really going to be noticeable..
>
> I could have sworn that either Matt Mackall or Ben LaHaise had cleaned
> up the existing zlib so much that it was practically a new
> implementation. I'm not aware of any open source implementations
> independent of zlib (except maybe that C++ behemoth, 7zip).
I cleaned up the version in lib/ that's used for boot on most systems.
It's quite a bit simpler and cleaner than the code lib/zlib (and
elsewhere!). But making it faster is another matter entirely - I don't
know off-hand how the two compare.
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2007-03-16 1:27 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-16 1:04 cleaner/better zlib sources? Linus Torvalds
2007-03-16 1:10 ` Shawn O. Pearce
2007-03-16 1:11 ` Jeff Garzik
2007-03-16 1:14 ` Matt Mackall [this message]
2007-03-16 1:46 ` Linus Torvalds
2007-03-16 1:54 ` Linus Torvalds
2007-03-16 2:43 ` Davide Libenzi
2007-03-16 2:56 ` Linus Torvalds
2007-03-16 3:16 ` Davide Libenzi
2007-03-16 16:21 ` Linus Torvalds
2007-03-16 16:24 ` Davide Libenzi
2007-03-16 16:35 ` Linus Torvalds
2007-03-16 19:21 ` Davide Libenzi
2007-03-17 0:01 ` Linus Torvalds
2007-03-17 1:11 ` Linus Torvalds
2007-03-17 3:28 ` Nicolas Pitre
2007-03-17 5:19 ` Shawn O. Pearce
2007-03-17 17:55 ` Linus Torvalds
2007-03-17 19:40 ` Linus Torvalds
2007-03-17 19:42 ` [PATCH 1/2] Make trivial wrapper functions around delta base generation and freeing Linus Torvalds
2007-03-17 19:44 ` [PATCH 2/2] Implement a simple delta_base cache Linus Torvalds
2007-03-17 21:45 ` Linus Torvalds
2007-03-17 22:37 ` Junio C Hamano
2007-03-17 23:09 ` Linus Torvalds
2007-03-17 23:54 ` Linus Torvalds
2007-03-18 1:13 ` Nicolas Pitre
2007-03-18 7:47 ` Junio C Hamano
2007-03-17 23:12 ` Junio C Hamano
2007-03-17 23:24 ` Linus Torvalds
2007-03-17 23:52 ` Jon Smirl
2007-03-18 1:14 ` Morten Welinder
2007-03-18 1:29 ` Linus Torvalds
2007-03-18 1:38 ` Nicolas Pitre
2007-03-18 1:55 ` Linus Torvalds
2007-03-18 2:03 ` Nicolas Pitre
2007-03-18 2:20 ` Linus Torvalds
2007-03-18 3:00 ` Nicolas Pitre
2007-03-18 3:31 ` Linus Torvalds
2007-03-18 5:30 ` Julian Phillips
2007-03-18 17:23 ` Linus Torvalds
2007-03-18 10:53 ` Robin Rosenberg
2007-03-18 17:34 ` Linus Torvalds
2007-03-18 18:29 ` Robin Rosenberg
2007-03-18 21:25 ` Shawn O. Pearce
2007-03-19 13:16 ` David Brodsky
2007-03-20 6:35 ` Robin Rosenberg
2007-03-20 9:13 ` David Brodsky
2007-03-21 2:37 ` Linus Torvalds
2007-03-21 2:54 ` Nicolas Pitre
2007-03-18 3:06 ` [PATCH 3/2] Avoid unnecessary strlen() calls Linus Torvalds
2007-03-18 9:45 ` Junio C Hamano
2007-03-18 15:54 ` Linus Torvalds
2007-03-18 15:57 ` Linus Torvalds
2007-03-18 21:38 ` Shawn O. Pearce
2007-03-18 21:48 ` Linus Torvalds
2007-03-20 3:05 ` Johannes Schindelin
2007-03-20 3:29 ` Shawn O. Pearce
2007-03-20 3:40 ` Shawn O. Pearce
2007-03-20 4:11 ` Linus Torvalds
2007-03-20 4:18 ` Shawn O. Pearce
2007-03-20 4:45 ` Linus Torvalds
2007-03-20 5:44 ` Junio C Hamano
2007-03-20 3:16 ` Junio C Hamano
2007-03-20 4:31 ` Linus Torvalds
2007-03-20 4:39 ` Shawn O. Pearce
2007-03-20 4:57 ` Linus Torvalds
2007-03-18 1:44 ` [PATCH 2/2] Implement a simple delta_base cache Linus Torvalds
2007-03-18 6:28 ` Avi Kivity
2007-03-17 22:44 ` Linus Torvalds
2007-03-16 16:35 ` cleaner/better zlib sources? Jeff Garzik
2007-03-16 16:42 ` Matt Mackall
2007-03-16 16:51 ` Linus Torvalds
2007-03-16 17:12 ` Nicolas Pitre
2007-03-16 23:22 ` Shawn O. Pearce
2007-03-16 17:06 ` Nicolas Pitre
2007-03-16 17:51 ` Linus Torvalds
2007-03-16 18:09 ` Nicolas Pitre
2007-03-16 1:33 ` Davide Libenzi
2007-03-16 2:06 ` Davide Libenzi
-- strict thread matches above, loose matches on Subject: below --
2007-03-16 6:08 linux
2007-03-16 11:34 ` Florian Weimer
2007-03-16 15:51 ` Josef Weidendorfer
2007-03-16 16:11 ` Linus Torvalds
2007-03-16 17:39 ` linux
2007-03-16 22:45 ` Josef Weidendorfer
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