On Wed, Dec 31, 2014 at 01:59:51AM +1000, Allan McRae wrote: > On 31/12/14 01:14, Mohammad Alsaleh wrote: > > * Add -9 which is the highest compression level. > > * Use lzma for secondary compression. > > I believe I said a patch adding '-9 -S djw' would be accepted in the > last discussion of this. > > How does lzma for secondary compression compare to djw in terms of > memory footprint and speed? >
Using an aging Laptop (Core 2 Due). Time is the samllest in 4 runs. inkscape: 05.765s 139.50MiB default 09.748s 235.02MiB -9 -S djw 09.315s 242.86MiB -9 -S lzma clang: 15.492s 140.46MiB default 36.503s 236.11MiB -9 -S djw 39.293s 243.68MiB -9 -S lzma > > > > 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 <[email protected]> > > --- > > scripts/pkgdelta.sh.in | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/scripts/pkgdelta.sh.in b/scripts/pkgdelta.sh.in > > index be49326..fe63974 100644 > > --- a/scripts/pkgdelta.sh.in > > +++ b/scripts/pkgdelta.sh.in > > @@ -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 > >
