On Sun, 9 Jun 2019 21:19:06 +0930
Simon Lees
On 08/06/2019 00:28, Jan Engelhardt wrote:
These is this month's compression shootout.
* Fedora's plan to replace xz-2 with zstd-18 will at least double their compression times.
For those of us actively trying to make things like the kernel build significantly faster because the current build time is too slow this kind of build time penalty wouldn't be acceptable no matter how much space it saved or time it saved extracting. In these larger packages compression etc takes up a significant percentage of the build time.
The question is: is it compression or "etc" that takes significant amount of time? Compression takes quite a bit of time but in my experience it is "etc" that takes most. Also during the build the package is compressed twice and decompressed twice (AFAIK) so saving on decompression may still offset higher compression cost to some extent. And as said in the e-mail you cite you can save on both compression and decompression at the cost of little space. Also the kernel tries (unsuccessfully) to use bzip2 instead of xz to save on compression time. You are supposed to be able to tune the compression method and parameters but the setting is lost for subpackages. Thanks Michal -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org