On Fri, 03 Dec 2010 23:07:51 +0200 Volodymyr Kostyrko <c.kw...@gmail.com> wrote:
> 30.11.2010 04:40, Julien Laffaye wrote: > > You can specify limits during compression, so the question is > > should we do that so that hosts with N MB of RAM can decompress > > packages? Do we retain the compression ratio over bzip2 if we > > limit compression memory to 512 MB so that decompression would be > > possible with, say, 128 MB? > > > > According to xz(1), in its default mode (-6), xz uses ~100MiB for > > compression and ~10MiB for decompression. > > That seems to be acceptable. > > You possibly miss something about compression/decompression. > > The designated memory size is not directly affected only by > compression mode. When decompressing you will need memory for: > > 1. Data history. > 2. Dictionary. > 3. Some indexes. > > And those ones are all empty at start. So say, if you are compressing > something really huge trying to use 4G of memory you end using that > much memory between 2G - 3G of source data. And we will need 512MB to > decompress that hunk of data. > > Are the packages _that_ large? [ .. ] The biggest package that can be produced by a port it's a bit over 10G. -- IOnut - Un^d^dregistered ;) FreeBSD "user" "Intellectual Property" is nowhere near as valuable as "Intellect" FreeBSD committer -> ite...@freebsd.org, PGP Key ID 057E9F8B493A297B
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