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 5A934CAC592 for ; Mon, 22 Sep 2025 08:09:43 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v0bbk-0007Bi-U7; Mon, 22 Sep 2025 04:09:12 -0400 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 1v0bbj-0007BP-Ts for qemu-devel@nongnu.org; Mon, 22 Sep 2025 04:09:11 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v0bbh-0006tR-LN for qemu-devel@nongnu.org; Mon, 22 Sep 2025 04:09:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1758528546; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PyxwHXKJku4lFfrzCaotS/lV51q50T34vgA9CpGy7i0=; b=HsWG7l/jnOdqc/45LhWwOFZNyhtg0i8Y62aPwlFiBlv2C6+VK1vl/0KbrkSvzYSCDlNXkx qnJBC3D2vQxhlUGfVavDWAxFwSDhA5Zui32+ORCu16tRNLFjNhfX+CcEg4TZ0CUHJSxL5k 8motDlk2BDgSj0jckPfQ8qcX7wxGjvI= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-93-lidI5jveM9W8go_wvYvhIQ-1; Mon, 22 Sep 2025 04:09:02 -0400 X-MC-Unique: lidI5jveM9W8go_wvYvhIQ-1 X-Mimecast-MFC-AGG-ID: lidI5jveM9W8go_wvYvhIQ_1758528540 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DBE1A180034D; Mon, 22 Sep 2025 08:08:59 +0000 (UTC) Received: from redhat.com (unknown [10.42.28.69]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1DB901800578; Mon, 22 Sep 2025 08:08:55 +0000 (UTC) Date: Mon, 22 Sep 2025 09:08:52 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: =?utf-8?Q?Marc-Andr=C3=A9?= Lureau Cc: qemu-devel@nongnu.org, Jiaxun Yang , Ed Maste , Thomas Huth , Li-Wen Hsu , Yonggang Luo , Warner Losh , Alex =?utf-8?Q?Benn=C3=A9e?= , Paolo Bonzini , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Kohei Tokunaga , Kyle Evans Subject: Re: [PATCH 02/24] scripts/archive-source: speed up downloading subprojects Message-ID: References: <20250919133320.240145-1-marcandre.lureau@redhat.com> <20250919133320.240145-3-marcandre.lureau@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/2.2.14 (2025-02-20) X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 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: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.442, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Sep 22, 2025 at 10:59:11AM +0400, Marc-André Lureau wrote: > Hi > > On Fri, Sep 19, 2025 at 5:50 PM Daniel P. Berrangé > wrote: > > > On Fri, Sep 19, 2025 at 05:32:56PM +0400, marcandre.lureau@redhat.com > > wrote: > > > From: Marc-André Lureau > > > > > > Running meson on each subproject is quite slow. > > > > Why is this faster ? Does it make meson do parallel downloads > > if you list then all at once ? > > > > It doesn't look like it does it in paralllel, yet it is x times faster... > > time sh -c 'for s in keycodemapdb libvfio-user berkeley-softfloat-3 > berkeley-testfloat-3 anyhow-1-rs arbitrary-int-1-rs bilge-0.2-rs > bilge-impl-0.2-rs either-1-rs foreign-0.3-rs itertools-0.11-rs libc-0.2-rs > proc-macro2-1-rs proc-macro-error-1-rs proc-macro-error-attr-1-rs > quote-1-rs syn-2-rs unicode-ident-1-rs; do > meson subprojects download $s >/dev/null > done' > sh -c 5.27s user 0.33s system 99% cpu 5.613 total > > time sh -c 'meson subprojects download keycodemapdb libvfio-user > berkeley-softfloat-3 berkeley-testfloat-3 anyhow-1-rs arbitrary-int-1-rs > bilge-0.2-rs bilge-impl-0.2-rs either-1-rs foreign-0.3-rs itertools-0.11-rs > libc-0.2-rs proc-macro2-1-rs proc-macro-error-1-rs > proc-macro-error-attr-1-rs quote-1-rs syn-2-rs unicode-ident-1-rs' > sh -c 0.32s user 0.01s system 99% cpu 0.339 total Oh I bet that 0.32secs is the overhead of python importing all modules that meson uses. Running python 18 times, gives the 5 second overhead. 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 :|