From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <hjl.tools@gmail.com>
Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com
 [IPv6:2607:f8b0:4864:20::1032])
 by sourceware.org (Postfix) with ESMTPS id 822E23857C62
 for <binutils@sourceware.org>; Tue,  8 Feb 2022 17:58:27 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 822E23857C62
Received: by mail-pj1-x1032.google.com with SMTP id
 v13-20020a17090ac90d00b001b87bc106bdso2676419pjt.4
 for <binutils@sourceware.org>; Tue, 08 Feb 2022 09:58:27 -0800 (PST)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20210112;
 h=x-gm-message-state:mime-version:references:in-reply-to:from:date
 :message-id:subject:to:cc;
 bh=ihVt3tiijj332JE4DtetltlPB5eYZXxgiy0lsyzP7Vk=;
 b=dedZXsT+j+Zf6hYSOMN6x+CEPHlauJnxOHV0XbqYwEoSWSPNVlOtSsysDYoQKvdsZd
 V/hrwq7anIXEHfDCSKdhro2Kx9DqsoFz5FpKdGU1fBGJ3MNZuUWRYguNMOW61D4OGVoE
 fn6PMnqZKTZga3uG0j6VzQE2sqm4VuWltO+fBWYxfWYMi0Sa2oTsBW5SWLRBfXTty7Fh
 BK9KABCoPNAtFy8nQ5A+Pt1e8SmmwdSB4oqbuyb/JbHFsmoXmZ5VP0S4u+wO8ro0hx0z
 t06Xy3W9RLvP3V6BsI3sy8L77VUnuSCeyZHd+CV9WJS6adw+lyvYa1G+JpcWfXHULbND
 ZJXw==
X-Gm-Message-State: AOAM5331KJOZ1CLWE006h2UDZloU2d+BakqSLCD0l/8NzCwreIOpp78j
 9DqgxMOTXuv9OWBfd6lR1BGSaF1L3ONAuaaOzgM=
X-Google-Smtp-Source: ABdhPJxYKB9ZyZ9+ZYpUiB7u4PvXi68VXWufoVAaNOp89fOcan3DkDjHxxV7ze+w1/GE1mHmQ0OSOFvLzA10E1NAKuM=
X-Received: by 2002:a17:903:2350:: with SMTP id
 c16mr5748620plh.4.1644343106433; 
 Tue, 08 Feb 2022 09:58:26 -0800 (PST)
MIME-Version: 1.0
References: <CANFcJrE9yEa5AH48WA8Go6KxA1_1qrX7JmTgQPA1g4fz+mTPFg@mail.gmail.com>
In-Reply-To: <CANFcJrE9yEa5AH48WA8Go6KxA1_1qrX7JmTgQPA1g4fz+mTPFg@mail.gmail.com>
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Tue, 8 Feb 2022 09:57:50 -0800
Message-ID: <CAMe9rOrE7D2U68dXXrYmx+ivYY-+Zx+144poniJ_6m+kpGY6ZQ@mail.gmail.com>
Subject: Re: Noted slowness in profile loading with binutils 2.37
To: Alexander Lindsay <alexlindsay239@gmail.com>
Cc: Binutils <binutils@sourceware.org>
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-3020.7 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_NUMSUBJECT,
 RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: binutils@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Binutils mailing list <binutils.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/binutils>,
 <mailto:binutils-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/binutils/>
List-Post: <mailto:binutils@sourceware.org>
List-Help: <mailto:binutils-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/binutils>,
 <mailto:binutils-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Tue, 08 Feb 2022 17:58:29 -0000

On Tue, Feb 8, 2022 at 9:45 AM Alexander Lindsay via Binutils
<binutils@sourceware.org> wrote:
>
> Hi all,
>
> I recently experienced a slow-down in profile loading by the tool pprof,
> and I believe I've boiled it down to changing from previous versions of
> binutils to binutils version 2.37. Timings of profile loading are
> documented on the pprof ticket I originally opened here:
> https://github.com/google/pprof/issues/680#issuecomment-1032174210. I
> reproduce them below:
>
> - binutils version 2.29.1: 1.1 seconds
> - binutils version 2.33.1: 1.1 seconds
> - binutils version 2.35.2: 6.8 seconds
> - binutils version 2.36.1: 6.5 seconds
> - binutils version 2.37: Still not loaded at 6 minutes
>
> I think the relevant binutil tool here is addr2line. Does anyone have a
> quick idea for what may have caused the slow-down? I was thinking about
> doing a git bisect, but I figured it is probably way more efficient to
> contact the experts!
>

This may be related to:

https://sourceware.org/bugzilla/show_bug.cgi?id=28843

-- 
H.J.