From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Re: Compilation speed Date: Fri, 07 Aug 2020 08:55:21 +0200 Message-ID: <87mu377xnq.fsf@gnus.org> References: <87bljnby36.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30530"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Aug 07 08:56:21 2020 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 1k3wIf-0007rr-5n for ged-emacs-devel@m.gmane-mx.org; Fri, 07 Aug 2020 08:56:21 +0200 Original-Received: from localhost ([::1]:49538 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k3wIe-00073m-8Q for ged-emacs-devel@m.gmane-mx.org; Fri, 07 Aug 2020 02:56:20 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57400) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k3wHr-0006Wo-5v for emacs-devel@gnu.org; Fri, 07 Aug 2020 02:55:31 -0400 Original-Received: from quimby.gnus.org ([2a01:4f9:2b:f0f::2]:53210) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k3wHp-0000MS-G9 for emacs-devel@gnu.org; Fri, 07 Aug 2020 02:55:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; 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=2bYA7iIQcpg/VFcw+ZIFzzlBtzBDF+bMEbzK4q0b0sw=; b=Whn7lzXbWawXxLpF2KjxlC1UY+ iXSRuS5SinBYZI3WvHJIciC8Af0EDVtkKCh1fHprZmRYSi62RVN7gwCXJEFn0nlYh+3evbY2cUTUC nJgqn9YYWpSJCcf1HHnY00gbZKsmoNF8/kn4jcjzafggA3Lrxze8gYmTDkBX8t4wOvEg=; Original-Received: from cm-84.212.202.86.getinternet.no ([84.212.202.86] helo=xo) by quimby with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k3wHi-0003tu-Jm; Fri, 07 Aug 2020 08:55:25 +0200 In-Reply-To: (Stefan Monnier's message of "Thu, 06 Aug 2020 18:14:20 -0400") Received-SPF: pass client-ip=2a01:4f9:2b:f0f::2; envelope-from=larsi@gnus.org; helo=quimby.gnus.org X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.devel:253490 Archived-At: Stefan Monnier writes: >> 00:00:50 Loading emacs-lisp/byte-run (source)... >> 00:00:50 Loading emacs-lisp/backquote (source)... >> [...] >> 00:01:02 Dump complete >> >> And dumping takes 12 seconds. > > For re-builds, this is also a very significant chunk, especially since > we often do it twice. Yes, that's true. >> This seems to proceed in parallell until we reach: >> >> 00:01:17 INFO Scraping files for loaddefs.el... >> [...] >> 00:01:54 INFO Scraping files for loaddefs.el...done >> >> Which is single-threaded and takes a whopping 37 seconds! Could that >> possibly be parallelised in some way? > > IIRC this should be generated in parallel with the compilation of the > preloaded files. Not sure why it's not the case. On my laptop (which is much slower), the loaddefs generation often runs in parallel with other things (well, sort of -- it's usually completed about a quarter of what it's doing when make runs out of other things to schedule). > Note that the native-compiler should solve a significant part of this > problem (by increasing the amount of time spent compiling the .elc files > in parallel ;-) :-) -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no