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[Bug default/24388] Disabling DIE deduplication improves compression for hello
https://sourceware.org/bugzilla/show_bug.cgi?id=24388
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
I tried the same with dwz as dwz input:
...
$ dwz dwz-for-test -o dwz-for-test.dwz
$ diff.sh dwz-for-test dwz-for-test.dwz
.debug_info red: 15% 119827 102801
.debug_abbrev red: 2% 4009 3964
.debug_str red: 0% 20731 20731
total red: 12% 144567 127496
$ dwz dwz-for-test -o dwz-for-test.dwz.2
$ diff.sh dwz-for-test dwz-for-test.dwz.2
.debug_info red: 14% 119827 103872
.debug_abbrev red: 23% 4009 3094
.debug_str red: 0% 20731 20731
total red: 12% 144567 127697
...
This seems to be a point where using DIE deduplication is just better than not
using it.
So, with this being the DIE counts:
...
$ count-dies.sh hello
130
$ count-dies.sh dwz-for-test
10.393
$ count-dies.sh cc1
10.188.941
...
perhaps a cut-off point of 100.000 would do.
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