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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/84402] [meta] GCC build system: parallelism
 bottleneck
Date: Wed, 30 Nov 2022 08:25:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D84402

--- Comment #50 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #48)
> Created attachment 53989 [details]
> CPU utilization of make all-host on recent AMD server
>=20
> The situation with a recent AMD server is really bad! Having 192 cores, t=
he
> average CPU utilization of `make all-host` is 6% !

Just do more builds in parallel!  There's just 903 .o files in gcc/ and
libbackend.a just has 490 of them.  It's not surprising the few larger
files stretch out the compile-time here.  Try LTOing libbackend.a?=