Re: cleaner/better zlib sources?

From: Jeff Garzik <jeff@garzik.org>
Date: Mar 16, 2007, 01:11 UTC
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.

Show 5 quoted lines

> 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