From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id DFA343860C37; Wed, 26 Aug 2020 12:35:36 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DFA343860C37
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1598445336;
 bh=RidmfyfdSS49Gzdso+41f8G4JK7BdNovPCwZFyVQKKM=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=ZmA01h66/6Z0i5yEPj7qB6xkdwONwf/j8TqJc53b82vE836vjSH2OFIK9KGuRbHQ8
 BM/cBduhBG5fZBeJDuOhwlLej84iCpCNIClcjy8+RjTNIY6dgs2QjbsMxrlgpO/XuV
 90fc3s9Z2YD7cOSeev6f9TewBr1w4Ggg2OBHX6LE=
From: "hubicka at ucw dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/96794] --with-build-config=bootstrap-lto-lean with
 --enable-link-mutex leads to poor LTRANS utilization
Date: Wed, 26 Aug 2020 12:35:36 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: bootstrap
X-Bugzilla-Version: 10.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hubicka at ucw dot cz
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-96794-4-7ThalfMNAx@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96794-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96794-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Wed, 26 Aug 2020 12:35:37 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96794

--- Comment #10 from Jan Hubicka <hubicka at ucw dot cz> ---
> We could also punt: when enable-link-mutex we could artificially up the j=
ob
> number for make to account for the waiting link steps.  I.e. when normall=
y -jN
> was given, the link step could be done under -j(N + nr-language - 1).  Th=
at
> would lead to the
> nr-of-languages-1 job server tokens taken up by the sleeping link steps t=
o be
> accounted for, and hence the (single running) link step still be able to =
use N
> threads/processes in parallel.

I do not think it is easy to do with current make jobserver.  The
toplevel jobserver opens the pipi with -jN many tokens and all other
makes connect to it.  It does not provide interface to return a token
and re-take it unless we implement it of course.

Honza
>=20
> --=20
> You are receiving this mail because:
> You are on the CC list for the bug.=