From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gproxy4-pub.mail.unifiedlayer.com (gproxy4-pub.mail.unifiedlayer.com [69.89.23.142]) by sourceware.org (Postfix) with ESMTPS id C81063858D1E for ; Sat, 24 Dec 2022 17:58:17 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C81063858D1E Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=tromey.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=tromey.com Received: from cmgw10.mail.unifiedlayer.com (unknown [10.0.90.125]) by progateway6.mail.pro1.eigbox.com (Postfix) with ESMTP id 3F693100476C2 for ; Sat, 24 Dec 2022 17:57:57 +0000 (UTC) Received: from box5379.bluehost.com ([162.241.216.53]) by cmsmtp with ESMTP id 98mTpqpcn9rmy98mTpWPRm; Sat, 24 Dec 2022 17:57:57 +0000 X-Authority-Reason: nr=8 X-Authority-Analysis: v=2.4 cv=a5L1SWeF c=1 sm=1 tr=0 ts=63a73da5 a=ApxJNpeYhEAb1aAlGBBbmA==:117 a=ApxJNpeYhEAb1aAlGBBbmA==:17 a=dLZJa+xiwSxG16/P+YVxDGlgEgI=:19 a=sHyYjHe8cH0A:10:nop_rcvd_month_year a=Qbun_eYptAEA:10:endurance_base64_authed_username_1 a=ekqJFO_ib2-Vce_JsrIA:9 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tromey.com; s=default; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date:References :Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=XvCi1w6rx9re1D0cjJF3Ym9rOr5NoCHPlO1X2RtQQ4s=; b=x4lQacOakAp8+Ztg8mPG3irQWJ QiKoFwMdiT4ZUxJGm0t3SYkHCfWnH3E2hbM0cie/i12S56jkA/k+UZSgr4Sdy95rGCG8JlObDyyRw fAGBLoJPsB7+WpCXMOlzvSlGb; Received: from [161.98.8.3] (port=41426 helo=prentzel) by box5379.bluehost.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1p98mT-0012Zd-0Z; Sat, 24 Dec 2022 10:57:57 -0700 From: Tom Tromey To: Eli Zaretskii Cc: Tom Tromey , gdb-patches@sourceware.org, luis.machado@arm.com Subject: Re: Two observations using GDB 13 snapshot References: <83h6xugc5v.fsf@gnu.org> <58b64bf8-90b6-d080-c060-d03761501199@arm.com> <83k02neezy.fsf@gnu.org> <835ye7e9jw.fsf@gnu.org> <87h6xrks77.fsf@tromey.com> <83mt7idacj.fsf@gnu.org> X-Attribution: Tom Date: Sat, 24 Dec 2022 10:57:53 -0700 In-Reply-To: <83mt7idacj.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 20 Dec 2022 05:26:20 +0200") Message-ID: <87fsd4elb2.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box5379.bluehost.com X-AntiAbuse: Original Domain - sourceware.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tromey.com X-BWhitelist: no X-Source-IP: 161.98.8.3 X-Source-L: No X-Exim-ID: 1p98mT-0012Zd-0Z X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (prentzel) [161.98.8.3]:41426 X-Source-Auth: tom+tromey.com X-Email-Count: 3 X-Source-Cap: ZWx5bnJvYmk7ZWx5bnJvYmk7Ym94NTM3OS5ibHVlaG9zdC5jb20= X-Local-Domain: yes X-Spam-Status: No, score=-3021.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,JMQ_SPF_NEUTRAL,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,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: Eli> So you are saying that the rewrite of the DWARF scanner could be the Eli> reason for the slowness? No, sorry. -readnow should not be affected much, if at all, by the rewrite. The new code is not used when -readnow is given. There's a case in dwarf2_initialize_objfile that ensures this. -readnow is just generally much slower because it does a lot more work. I don't know why it would have slowed down between 12 and 13, though. Eli> Let me know if I can provide any additional information that could be Eli> useful in investigating this. Eli> Would it be useful to open a bugzilla issue? The best thing would be some kind of comparison of profiles between the two versions, to try to see what caused the slowdown. However, that's a lot of work. FWIW I tend not to pay much attention to -readnow. I never use it myself and I try to dissuade others from using it as well. Tom