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pkgdelta: Use high compression options offered by xdelta3

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* Add -9 which is the highest compression level.
 * Use lzma for secondary compression.

 Decompression speed is largely unaffected as most cycles are consumed
 by xz for re-compression.

 Some numbers:

 clang x86_64 [3.5.0-2.1 to 3.5.0-3]
 17.21MiB      default      (0.73)
 15.67MiB      -9           (0.67)
 13.59MiB      -9 -S djw    (0.58)
 12.01MiB      -9 -S lzma   (0.51)

 inkscape x86_64 [0.48.5-3 to 0.48.5-4]
 02.69MiB      default      (0.21)
 01.64MiB      -9           (0.13)
 01.30MiB      -9 -S djw    (0.10)
 01.01MiB      -9 -S lzma   (0.08)

Signed-off-by: Mohammad Alsaleh <CE.Mohammad.AlSaleh@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>
This commit is contained in:
Mohammad Alsaleh 2014-12-30 17:14:08 +02:00 • committed by Allan McRae
parent 8da9be0955
commit 95da285f56
1 changed files with 1 additions and 1 deletions
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2
scripts/pkgdelta.sh.in
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@ -140,7 +140,7 @@ create_xdelta()
deltafile=$(dirname "$newfile")/$pkgname-${oldver}_to_${newver}-$arch.delta
local ret=0
xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
xdelta3 -q -f -9 -S lzma -s "$oldfile" "$newfile" "$deltafile" || ret=$?
if (( ret )); then
error "$(gettext "Delta could not be created.")"
return 1