Fwd: lrzip: extreme compression (but beware its slow decompression speed)

[Ralf Corsepius]

On 03/30/2012 07:05 PM, Joel Sherrill wrote:
> Interesting study of compression programs on gcc's tarball.

Yes, an interesting summary.

> The size vs time is interesting.

Well, Jim had posted similar statistics to Fedora and automake lists 
several times before.

  His activities in the end had led Fedora to choose xz (Fedora's and 
CentOS 6's rpm uses xz to compress its payload) and to choose customized 
compression levels for xz which result into much better compression than 
bz2 at comparable decompression times.

  He recently did something similar for automake. AFAIK, the next 
release of automake (scheduled to be release for next week), will 
contain reflections of his experiments.

There is one issue with xz, Jim usually doesn't mention  ;):
  xz is much more memory-demanding than gz or bz2.

That said, as mentioned elsewhere before, I am considering to use 
self-built/repackaged *.xz compressed gcc tarballs instead of the 
original gnu.org compressed gcc*.bz2 tarballs for building the rpms.

The reduction of package sizes, corresponding reduction of discspace on 
mirrors and improvements on building speed (During builds these files a 
copied over nfs) is overwhelming, IMNSHO.

Ralf