[libvirt] [RFC PATCH] build: increase xz compression level
Increase the default compression level to 9 from 6. This also increases decompression memory requirements from 9 MB to 65 MB. --- The resulting tarball is 880 kB smaller [10.5 MB] Level 8 requires 33 MB and saves 520 kB [10.8 MB] Level 7 requires 17 MB and saves 170 kB [11.2 MB] Compression time is not much different since we're already using --extreme. The Linux kernel also uses -9, but the tarball is 8x our size. cfg.mk | 3 +++ 1 file changed, 3 insertions(+) diff --git a/cfg.mk b/cfg.mk index e93114c..ebafb0f 100644 --- a/cfg.mk +++ b/cfg.mk @@ -16,6 +16,9 @@ # along with this program. If not, see # <http://www.gnu.org/licenses/>. +XZ_OPT ?= -9e +export XZ_OPT + # Use alpha.gnu.org for alpha and beta releases. # Use ftp.gnu.org for major releases. gnu_ftp_host-alpha = alpha.gnu.org -- 2.7.3
On Fri, Jun 24, 2016 at 12:34:57AM +0200, Ján Tomko wrote:
Increase the default compression level to 9 from 6.
This also increases decompression memory requirements from 9 MB to 65 MB.
ok, that's still tiny compared to memory used by gcc to actually compile libvirt
--- The resulting tarball is 880 kB smaller [10.5 MB] Level 8 requires 33 MB and saves 520 kB [10.8 MB] Level 7 requires 17 MB and saves 170 kB [11.2 MB] Compression time is not much different since we're already using --extreme.
That's ok then.
The Linux kernel also uses -9, but the tarball is 8x our size.
cfg.mk | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/cfg.mk b/cfg.mk index e93114c..ebafb0f 100644 --- a/cfg.mk +++ b/cfg.mk @@ -16,6 +16,9 @@ # along with this program. If not, see # <http://www.gnu.org/licenses/>.
+XZ_OPT ?= -9e +export XZ_OPT
The cfg.mk is for controlling gnulib syntax-check code. This should be part of Makefile.am Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
participants (2)
-
Daniel P. Berrange -
Ján Tomko