From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 808CDC38145 for ; Tue, 6 Sep 2022 07:57:39 +0000 (UTC) Received: from localhost ([::1]:52082 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oVTSk-0008J3-AX for qemu-devel@archiver.kernel.org; Tue, 06 Sep 2022 03:57:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44916) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oVTQm-0007Lr-ON for qemu-devel@nongnu.org; Tue, 06 Sep 2022 03:55:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:46909) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oVTQh-0006iN-4p for qemu-devel@nongnu.org; Tue, 06 Sep 2022 03:55:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1662450928; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references; bh=ql9XwwrWLDS7RmWpcHHnQgu9yt6jlgMh3hC6bc8bOkA=; b=IaFyW689E6aA/HJfvnkCto1lDEamjnbHwaPO34ItECz9e6qjqrVen+s6708+BhdBCOSPHD aoEOXZBepK7t8A7f7USAu0vM9N2i1ZiG34yP7twPwuj1wP0CtZya+noTDct6J91+f6/3+M fUIXX8gKM1tcU0i0czemXlQAjrr+p9I= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-611-PlrfeUv7PmixKMDZazLnQg-1; Tue, 06 Sep 2022 03:55:25 -0400 X-MC-Unique: PlrfeUv7PmixKMDZazLnQg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D50D83C0F360; Tue, 6 Sep 2022 07:55:24 +0000 (UTC) Received: from redhat.com (unknown [10.33.36.79]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 240E940B40C9; Tue, 6 Sep 2022 07:55:24 +0000 (UTC) Date: Tue, 6 Sep 2022 08:55:20 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Peter Maydell Cc: Claudio Fontana , qemu-devel Subject: Re: sphinx-build is really slow, any way to improve that? Message-ID: References: <53b94520-f02b-aef5-b372-0460531b566f@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.6 (2022-06-05) X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Sep 05, 2022 at 10:21:55PM +0100, Peter Maydell wrote: > On Mon, 5 Sept 2022 at 20:51, Claudio Fontana wrote: > > when I build qemu, there is a lot of time spent at the end of the build where one cpu goes 100% on sphinx-build. > > > > Is there some way to parallelize that? It seems it is the current bottleneck for rebuilds for me.. > > It's a big fat python program, so I suspect not, but > maybe I'm wrong. It annoys me too and I've had a look at what it is doing in the past and failed to find an obvious way to improve it. I fear this could be an inherant limitation of the way we use sphinx to build the docs as a complete manual, as compared to say treating each docs source file as a distinct standalone web page. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|