Finn Thain dixit:
>I don't know how much memory is needed by the "xz -0d" algorithm. The xz
RTFM ;-)
Preset DictSize CompCPU CompMem DecMem
-0 256 KiB 0 3 MiB 1 MiB
-1 1 MiB 1 9 MiB 2 MiB
-2 2 MiB 2 17 MiB 3 MiB
-3 4 MiB 3 32 MiB 5 MiB
-4 4 MiB 4 48 MiB 5 MiB
-5 8 MiB 5 94 MiB 9 MiB
-6 8 MiB 6 94 MiB 9 MiB
-7 16 MiB 6 186 MiB 17 MiB
-8 32 MiB 6 370 MiB 33 MiB
-9 64 MiB 6 674 MiB 65 MiB
It depends on what it was _compressed_ with.
Rule of thumb: xz -0 is faster than gzip -6 in compression and
has about the same ratio, xz -2 compresses about as fast as gzip -6
with better ratio; decompression times are decent (given enough RAM)
and xz always beats bzip2 considering bzip2 decompresses… badly.
With -e, compression ratio increases at no decompression cost
(neither RAM nor speed), only compression cost (speed, not RAM,
but quite a lot of speed).
bye,
//mirabilos
--
„Also irgendwie hast du IMMER recht. Hier zuckelte gerade ein Triebwagen mit
der Aufschrift "Ostdeutsche Eisenbahn" durch Wuppertal. Ich glaubs machmal
nicht…“ -- Natureshadow, per SMS
„Hilf mir mal grad beim Denken“ -- Natureshadow, IRL, 2x
--
To UNSUBSCRIBE, email to [email protected]
with a subject of "unsubscribe". Trouble? Contact [email protected]
Archive:
http://lists.debian.org/[email protected]
