[NTLUG:Discuss] compression and Filesystem question -- Squish filesystem (BWT/bzip2 compression?)

[Bryan J. Smith]

Ralph Green, Jr wrote:  
> There is a filesystem called squish.  It is what Knoppix and similar
> bootable CD linux systems use to get 1.5 gig on a CD.  I have never
> used it, but I understand that it takes quite a bit of CPU time to
> run the compression.  If this is a normal daily backup you are doing,
> it probably is not worth the effort.  Check it out at 
> http://www.squish.net/

Sounds like they might use BWT (bzip2) as the compressor/decompressor.
Unlike LZ77 (gzip), decompression is not near real-time with BWT
(and compression takes a lot longer too).

There is a comparison of no, LZ77 (gzip), BWT (bzip2) and LZO (lzop) at
the bottom of this article:  
http://www.matrixlist.com/pipermail/leaplist/2001-December/016244.html  

Times are for archive=compress, restore=decompress.


-- 
     Linux Enthusiasts call me anti-Linux.
   Windows Enthusisats call me anti-Microsoft.
 They both must be correct because I have over a
decade of experience with both in mission critical
environments, resulting in a bigotry dedicated to
 mitigating risk and focusing on technologies ...
           not products or vendors
--------------------------------------------------
Bryan J. Smith, E.I.            b.j.smith at ieee.org