From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: "Significant Garbage Collection Improvement For Emacs" - sweep_conses performance improved by 50%? Date: Sat, 11 Feb 2023 20:10:13 +0000 Message-ID: <874jrsufoa.fsf@localhost> References: <871qqr425n.fsf@yahoo.com> <42ba5e8a-8a26-4afd-ab59-efbb967e8a24@app.fastmail.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6478"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Po Lu , Stefan Kangas , Emacs developers To: Tyler Dodge Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Feb 11 21:10:27 2023 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pQwCX-0001Ok-Re for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Feb 2023 21:10:25 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pQwBr-0007gh-6V; Sat, 11 Feb 2023 15:09:43 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pQwBn-0007gG-SF for emacs-devel@gnu.org; Sat, 11 Feb 2023 15:09:40 -0500 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pQwBl-0006KD-Q4 for emacs-devel@gnu.org; Sat, 11 Feb 2023 15:09:39 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 89DF32402F7 for ; Sat, 11 Feb 2023 21:09:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1676146175; bh=tj6qXUQukVJBamve69VyA/ZTkLg+e3f2c0GbS5o0UvI=; h=From:To:Cc:Subject:Date:From; b=LAgVHpXdKk6160hBmtjoaDKvzVoRnzcaITmhPspUwGIw3CrGLKZs/G07/iQVkjQLZ cRlIlVSvMCSnp7vQaIZa/h8DiDP9dy9fdN4Vv6iDv0sJWq3u/Z6QTYt5HTKfBBx/+b BjhcYISBMSh2vtE5W/bKtlpsIyqPMBiiGH31MPhEMFI7eRwTKL8oBCu9iT0s61SwBK C4+kCAsgSBvMkO59e8Bvw7VxzD5y7yKYgWa2Sx6qGjb99XahOto84j2IDQ3JmPSFWH s8quM5dgC6DJkXhwp4uiQXpdKg//9ANs0dQ7EfWNiLgh5gBhPbfRpleIM/XjiFZByK GV1kJqDqkYGGg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4PDhXD1lV8z9rxD; Sat, 11 Feb 2023 21:09:32 +0100 (CET) In-Reply-To: <42ba5e8a-8a26-4afd-ab59-efbb967e8a24@app.fastmail.com> Received-SPF: pass client-ip=185.67.36.65; envelope-from=yantar92@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:303155 Archived-At: "Tyler Dodge" writes: > Since writing that blogpost, I did attempt a few variations of adding prefetch > instructions in sweep_conses, but all of the variants I tried ended up having > significantly worse performance characteristics than omitting them. That makes > it a bit harder for me to believe that it's attributable to cache locality, but like > you said, there are a number of other reasons that could be the actual cause. May I know if there have been any progress on this? Is there any help/testing needed? GC is really making a big impact on Emacs performance. I believe that many people would appreciate even few percent overall speed-ups if they can be achieved as easily as described in the post. Even if only on certain builds. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at