Package: poppler-data
Version: 0.4.5-8
Severity: normal
poppler-data 0.4.5-8 uses xz compression with "-Sextreme -z9" settings.
I think it's overkill (-6e should be enough).
Xz memory use when building this package is now 674 MiB and 65 MiB
is required when decompressing during installation.
xz(1) manual page says:
The differences between the presets are more significant
than with gzip(1) and
bzip2(1). The selected compression settings determine the
memory requirements of
the decompressor, thus using a too high preset level might
make it painful to
decompress the file on an old system with little RAM.
Specifically, it's not a
good idea to blindly use -9 for everything like it often
is with gzip(1) and bzip2(1).
Here is a table of memory use with different presets:
Preset DictSize CompCPU CompMem DecMem
-0e 256 KiB 8 4 MiB 1 MiB
-1e 1 MiB 8 13 MiB 2 MiB
-2e 2 MiB 8 25 MiB 3 MiB
-3e 4 MiB 7 48 MiB 5 MiB
-4e 4 MiB 8 48 MiB 5 MiB
-5e 8 MiB 7 94 MiB 9 MiB
-6e 8 MiB 8 94 MiB 9 MiB
-7e 16 MiB 8 186 MiB 17 MiB
-8e 32 MiB 8 370 MiB 33 MiB
-9e 64 MiB 8 674 MiB 65 MiB
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