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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/25703] set dwarf max-cache-age default of 5 is slow for
 inter-CU-reference binaries
Date: Sun, 22 Mar 2020 05:45:53 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25703

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Another data point, using system gdb 8.3.1 on openSUSE Leap 15.1:
...
$ time.sh gdb -batch -iex "maint set dwarf max-cache-age $n"
usr/lib/debug/usr/lib64/firefox/libxul.so-74.0-1.1.x86_64.debug
...

n=3D5 (default)
maxmem: 7084448
real: 362.42
user: 360.25
system: 2.13


n=3D10
maxmem: 7421056
real: 310.57
user: 308.35
system: 2.21

n=3D32
maxmem: 8273816
real: 250.26
user: 247.74
system: 2.47


n=3D100
maxmem: 9010380
real: 192.34
user: 189.75
system: 2.58

n=3D316
maxmem: 9637176
real: 143.71
user: 140.78
system: 2.91

n=3D1000
maxmem: 10504788
real: 114.22
user: 111.25
system: 2.96

n=3D1316
maxmem: 10502420
real: 119.02
user: 115.66
system: 3.34

So, increasing the value from 5 to 1000 reduces execution time with a facto=
r 3
from 6 minutes to 2 minutes, at the cost of roughly 1.5 times more memory.

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