On Wednesday 16 Oct 2013, Marius Gavrilescu wrote: > David Goodenough <david.goodeno...@btconnect.com> writes: > > The only problem is that on small machines (things like the BeagleBone) > > xz compression requires enough memory that you have to enable swap to > > use dpkg. Now on a machine with a sensible disk this is not a problem, > > but on a machine where the "disk" is an SD-card it is a disaster. > > From the xz manpage: > # 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 > > At the default preset (-6), the required RAM for decompressing is about > 9MB. The BeagleBone seems to have 256MB of memory (that's what > Wikipedia says), so 9MB shouldn't be an issue. > > And if 9MB is too much for some random board, xz -0 still compresses > better than gzip -9 (or so it should) with only 1MB of DecMem. xy may only use a tiny bit, but the combination of apt-get, dpkg and xy seems to cause problems. Its not just BeagleBones, there are x86 machines with just 64MB still on sale.
David -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/201310161732.38040.david.goodeno...@btconnect.com
