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| author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2012-06-29 14:26:31 -0400 |
|---|---|---|
| committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2012-06-29 15:24:52 -0400 |
| commit | 4911a10a4e51102a21a5d123a852c75d2ec92dbc (patch) | |
| tree | 6e02ca6d92cc037efc89801960f4997a7d54e168 /perl/lib/Nix/SSH.pm | |
| parent | 49cd7387ad6546571ca31a41f208091b482defaa (diff) | |
Use XZ compression in binary caches
XZ compresses significantly better than bzip2. Here are the
compression ratios and execution times (using 4 cores in parallel) on
my /var/run/current-system (3.1 GiB):
bzip2: total compressed size 849.56 MiB, 30.8% [2m08]
xz -6: total compressed size 641.84 MiB, 23.4% [6m53]
xz -7: total compressed size 621.82 MiB, 22.6% [7m19]
xz -8: total compressed size 599.33 MiB, 21.8% [7m18]
xz -9: total compressed size 588.18 MiB, 21.4% [7m40]
Note that compression takes much longer. More importantly, however,
decompression is much faster:
bzip2: 1m47.274s
xz -6: 0m55.446s
xz -7: 0m54.119s
xz -8: 0m52.388s
xz -9: 0m51.842s
The only downside to using -9 is that decompression takes a fair
amount (~65 MB) of memory.
Diffstat (limited to 'perl/lib/Nix/SSH.pm')
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