From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by sourceware.org (Postfix) with ESMTPS id 378C23847803 for ; Thu, 22 Apr 2021 20:17:00 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 378C23847803 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=mliska@suse.cz X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 2B3CCB1C5; Thu, 22 Apr 2021 20:16:59 +0000 (UTC) Subject: Re: State of AutoFDO in GCC To: Eugene Rozenfeld , "gcc@gcc.gnu.org" References: Cc: "Bin.Cheng" , Jan Hubicka From: =?UTF-8?Q?Martin_Li=c5=a1ka?= Message-ID: <62330f82-201d-af7d-d1ed-1c8c529cc0f7@suse.cz> Date: Thu, 22 Apr 2021 22:16:57 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-5.3 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, KAM_SHORT, NICE_REPLY_A, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gcc@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Apr 2021 20:17:02 -0000 On 4/22/21 9:58 PM, Eugene Rozenfeld via Gcc wrote: > GCC documentation for AutoFDO points to create_gcov tool that converts perf.data file into gcov format that can be consumed by gcc with -fauto-profile (https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html, https://gcc.gnu.org/wiki/AutoFDO/Tutorial). > > I noticed that the source code for create_gcov has been deleted from https://github.com/google/autofdo on April 7. I asked about that change in that repo and got the following reply: > > https://github.com/google/autofdo/pull/107#issuecomment-819108738 > > "Actually we didn't use create_gcov and havn't updated create_gcov for years, and we also didn't have enough tests to guarantee it works (It was gcc-4.8 when we used and verified create_gcov). If you need it, it is welcomed to update create_gcov and add it to the respository." > > Does this mean that AutoFDO is currently dead in gcc? Hello. Yes. I know that even basic test cases have been broken for years in the GCC. It's new to me that create_gcov was removed. I tend to send patch to GCC that will remove AutoFDO from GCC. I known Bin spent some time working on AutoFDO, has he came up to something? Martin > > Thanks, > > Eugene >