Re: [Lzip-bug] Feature Request/Question - Compression Level Information

[Antonio Diaz Diaz]

Timothy Beryl Grahek wrote:
> > You can look at the output of -lv. If the dictionary size is smaller
> > than the uncompressed size, then the file can be compressed more.
>
> What you suggested is extremely helpful. I thought I would point out,
> though, that the dictionary size goes up to 32 MiB and then goes no
> larger; I figure that indicates maximum compression level, but such an
> observation is in contrast to what you've stated, so I thought I would
> mention it.

You can find in the lzip manual[1] the dictionary size limit used by 
each compression level. 32 MiB corresponds to level -9. You can use 
larger dictionary sizes with the option '--dictionary-size', but it is 
not recommended because generally the increase in compression is small 
and the resulting file may be difficult to decompress on systems with 
little RAM.

[1] http://www.nongnu.org/lzip/manual/lzip_manual.html#Invoking-lzip


Best regards,
Antonio.