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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/24388] Disabling DIE deduplication improves compression
 for hello
Date: Tue, 01 Jan 2019 00:00:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D24388

--- 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=20
.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=20
.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.

--=20
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