From: Jeff Garzik <jeff@garzik.org>
Date: Fri, 16 Mar 2007 01:11:49 GMT
Subject: Re: cleaner/better zlib sources?
Message-ID: <45F9EED5.3070706@garzik.org>
In-Reply-To: <Pine.LNX.4.64.0703151747110.3816@woody.linux-foundation.org>

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.


> 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).

	Jeff