From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=1UBI=DW=gentoo.org=sam@sourceware.org>
Received: from smtp.gentoo.org (mail.gentoo.org [IPv6:2001:470:ea4a:1:5054:ff:fec7:86e4])
	by sourceware.org (Postfix) with ESMTP id 8D2D43858D1E
	for <binutils@sourceware.org>; Sat,  5 Aug 2023 00:38:28 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 8D2D43858D1E
Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gentoo.org
Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gentoo.org
References: <87bkfta1mf.fsf@redhat.com> <87350ytwbk.fsf@Rainer.invalid>
User-agent: mu4e 1.10.4; emacs 30.0.50
From: Sam James <sam@gentoo.org>
To: ASSI <Stromeko@nexgo.de>
Cc: binutils@sourceware.org
Subject: Re: GNU Binutils 2.41 release
Date: Sat, 05 Aug 2023 01:38:06 +0100
Organization: Gentoo
In-reply-to: <87350ytwbk.fsf@Rainer.invalid>
Message-ID: <87sf8y8gsf.fsf@gentoo.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00,JMQ_SPF_NEUTRAL,KAM_DMARC_STATUS,SPF_HELO_PASS,SPF_PASS,TXREP autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org
List-Id: <binutils.sourceware.org>


ASSI <Stromeko@nexgo.de> writes:

> Nick Clifton via Binutils writes:
>> We are pleased to announce that version 2.41 of the GNU Binutils project
>> sources have been released and are now available for download at:
> [=E2=80=A6]
>
> I see massive performance degradation in ld on Cygwin when linking
> libraries or executables with a large number of objects.
>
> For example compiling protobuf-21.12:
>
> binutils-2.39: 1420.820u 143.747s  3:20.37 780.8%      0+0k 0+0io 4153107=
3pf+0w
> binutils-2.40: 1429.088u 140.548s  3:18.48 790.8%      0+0k 0+0io 4161563=
7pf+0w
> binutils-2.41: 1496.555u 524.457s 10:07.31 332.7%      0+0k 0+0io 4157011=
2pf+0w
>
> The linking step alone:
>
> binutils-2.39:   14.212u   2.614s  0:20.54 81.8%       0+0k 0+0io 1909884=
pf+0w
> binutils-2.40:   13.371u   0.839s  0:20.46 69.4%       0+0k 0+0io 1910885=
pf+0w
> binutils-2.41:   85.507u 373.960s  7:55.39 96.6%       0+0k 0+0io 1905021=
pf+0w
>
> I have another much larger application where the linking went from
> seconds to over an hour.
>
> The fact that a lot of that extra time is spent in system might provide
> a clue for finding the culprit.  BUt there's extra time in user as well
> and it seems to scale superlinearly with the number of objects.  It's
> possible that objdump performance has also suffered, I've not yet
> checked this in detail.
>

Please file a bug with the details so we can discuss it there and
collect some reproducers.

>
> Regards,
> Achim.