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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/95348] GCC records zero functions and modules in
 the profiling data file, ICC does NOT
Date: Wed, 03 Jun 2020 06:35:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95348

--- Comment #25 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
> I will try to get more data on our real application.=20
>=20
> one question: why not just delete the entire records whose counter is zero
> and delete the entire file whose counter is zero?

Because we need to distinguish in between situations where a function was
really not executed (counter =3D=3D 0) and the situation where we miss prof=
ile for
a function.

One another solution could be the usage of gzip that can shrink file sizes
~10x.
That will be beneficial in situation where you don't merge profiles.

How exactly do you merge profiles? Do you run parallel invocation which can
take log2(N)?=