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From: "qinzhao 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: Mon, 01 Jun 2020 15:39:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95348

--- Comment #18 from qinzhao at gcc dot gnu.org ---
(In reply to Martin Li=C5=A1ka from comment #16)
> > For our application, all processes generating profiling feedback data t=
o a
> > single directory seems is not a choice.=20
>=20
> Why is it problem? You need to provide reasoning for that.

this is a long time ago. If I remembered correctly, we tried the scheme tha=
t=20
all the processes generate profiling feedback data to the single directory,=
=20
but looks like a lot of info got lost, resulting bad performance effect.=20
then we switched to this current approach.=20

>=20
> > We chose -fprofile-dir=3D%p and then use gcov-merge to merge them.
>=20
> Sure, that's possible but you pay with a lot of disk space needed.
> Btw. how long does it take to merge all the collected data with gcov-tool?
I didn't get very accurate info on this, but it's over 24 hours for merging=
.=