Re: Upcoming FTPMaster meeting
On Sat, 12 Feb 2011, Philipp Kern wrote:
> Do we have an idea how much more memory xz needs for decompression? I guess
> it wouldn't be feasible to switch dpkg's default on package builds on those
> architectures where we assume some more beefyness?
It depends on what compression level we use, this is in the manpage:
The following table summarises the features of the presets:
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
"DecMem" is the memory needed to decompress (i.e. install the package),
"CompMem" is the memory needed to compress (i.e. create the package).
I think we could use -6 on all architectures without much problem. It's also
the default setting used by xz if you don't specify anything.
> I'd imagine that our CD1s would also get more useful if we'd compress those
> in any case.
Yeah, it's those discussions about our CD1 that led me to push this forward again.
Cheers,
--
Raphaël Hertzog ◈ Debian Developer
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