| 1 |
÷ Mon, 12 May 2014 14:47:36 +0400 |
| 2 |
Alexander Tsoy <alexander@××××.me> ÐÉÛÅÔ: |
| 3 |
|
| 4 |
> ÷ Sun, 11 May 2014 18:26:32 -0500 |
| 5 |
> Gordon Pettey <petteyg359@×××××.com> ÐÉÛÅÔ: |
| 6 |
> |
| 7 |
> > A lot of small files (e.g. AUTHORS, ChangeLog |
| 8 |
> > |
| 9 |
> > FWIW: On my system, I have 59M of bz2 files in /usr/share/man and |
| 10 |
> > /usr/share/doc. A short script to decompress those and recompress with xz |
| 11 |
> > -6e reduced that to 36M. |
| 12 |
> |
| 13 |
> Very strange o_O |
| 14 |
> |
| 15 |
> Here is my test results. xz options: "--lzma2=preset=6e,dict=4MiB". |
| 16 |
> Larger dictionary size does not improve compression ratio, I get |
| 17 |
> even worse results with just "-6e" or "-9e". man-bz2 is a full copy of |
| 18 |
> my /usr/share/man, man-xz is a recompressed one. |
| 19 |
> |
| 20 |
> Size comparison: |
| 21 |
> |
| 22 |
> $ du -s man-bz2/ man-xz/ |
| 23 |
> 82032 man-bz2/ |
| 24 |
> 82308 man-xz/ |
| 25 |
|
| 26 |
Note that a lot of files in these directories are non-compressed text files |
| 27 |
or symlinks: |
| 28 |
|
| 29 |
$ find man-bz2/ \( ! -name "*.bz2" -o -type l \) -a ! -type d | wc -l |
| 30 |
8434 |
| 31 |
$ find man-bz2/ -name "*.bz2" -type f | wc -l |
| 32 |
11243 |
| 33 |
$ find man-xz/ \( ! -name "*.xz" -o -type l \) -a ! -type d | wc -l |
| 34 |
8434 |
| 35 |
$ find man-xz/ -name "*.xz" -type f | wc -l |
| 36 |
11243 |
| 37 |
|
| 38 |
After cleaning them and adding -b option: |
| 39 |
|
| 40 |
$ du -bs man-bz2/ man-xz/ |
| 41 |
32158286 man-bz2/ |
| 42 |
32550305 man-xz/ |
| 43 |
|
| 44 |
-- |
| 45 |
Alexander Tsoy |
Archives