Control: retitle -1 Consider switching initrd compression from gz to xz Control: found -1 20121114 Hi Tonda, and sorry it took so long before getting back to you. Tonda Míšek <miseka@naxo.net> (20/12/2009): > I did experiment to maximally decrease size of the installer and > results are: > file name - original size - optimized size - difference - % > initrd.gz - 6404938 B - 6127255 B - 277683 B - 95.6% > setup.exe - 280420 B - 250724 B - 29696 B - 89.4% > splash.png - 6329 B - 5687 B - 642 B - 89.9% > mini.iso - 9390080 B - 9082059 B - 308021 B - 96.7% > dpkg_1.15.5.4_i386.deb - 2166906 B - 2026557 B - 140349 B - 93.5% > > How I did the optimization: > initrd.gz - recompressed with 7zip (7z a -tGZip -mx=9 initrd.gz initrd) > setup.exe - compressed with UPX (upx --lzma --ultra-brute setup.exe) > splash.png - optimized with advpng (advpng -z -4 splash.png) > mini.iso - only estimated size > dpkg_1.15.5.4_i386.deb - control.tar.gz and data.tar.gz recompressed > with 7zip > > The initrd can be compressed even more with XZ. "xz -9 -e initrd" > produces file with size 4660512 B, i.e. 72.8% (and for mini.iso - > 7615316 B, which is 81%). > The dpkg_1.15.5.4_i386.deb produced with XZ has size 1250000 B, > which is 57.7%. > > > My personal opinions: > 1. Using of 7zip is "compatible way" so it can be used with minimal > changes to build system and it can allow to place 5-10% more > packages on the installation CD. Looking at the gtk initrd.gz for amd64, we start from: 29025138 initrd.gz down to (using 7z with max compression), after a long while compressing: 27561651 initrd.gz Using xz -1 we get to: 22864564 initrd.xz With default compression, even down to: 20344888 initrd.xz FWIW the initrd switch to xz happened already, but only for sparc. It looks to me like this is too late to consider doing the same for other architectures. Updating the title accordingly, hopefully we'll be able to implement that during the jessie release cycle. > 2. XZ will be big step forward :-) All udebs and most of CD#1 debs are now xz-compressed (at least the data part of it); and that helped indeed. Mraw, KiBi.
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