From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 3AF9D1396D9 for ; Mon, 13 Nov 2017 03:48:57 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id E9749E0E7A; Mon, 13 Nov 2017 03:48:50 +0000 (UTC) Received: from mail-vk0-x22e.google.com (mail-vk0-x22e.google.com [IPv6:2607:f8b0:400c:c05::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 913BBE0E08 for ; Mon, 13 Nov 2017 03:48:50 +0000 (UTC) Received: by mail-vk0-x22e.google.com with SMTP id o70so908735vkc.9 for ; Sun, 12 Nov 2017 19:48:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=r2urT7Rniqc2KyNXxkyfPVeBEbr7ygsc0v0QNwzRxoc=; b=P5Dy22MIUmIFT0vKkqMlMwUPSKZMPJSeMOeWpRHfudSDGyYf8gi/uVT2fK2gIYsPX6 ldjkboud06UaRjXc/2OeUZETor5HgGRGmRvlqYYS/b3Tioqhq0hQoiZOPR13z41tOVjU NbOJrdgjMuEti4EKJiomTNzXa5tIQFFVsHWobJ371qBabCytbMpJ4W8f2dXCnNsfu3A/ t63hM3pd7c0u4yf3EjGkX+a8RoxHsgmlZ3tn8ayYS/sq/PXwkTigiOT6rKe0cPv1WU4Z 1uTdWtr1fCSGcsmmA0g/UmpZWl1EqAHXsaF7VGpLwe4UoPASqNUwxLdLx6qvuaI3nUnj RsRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=r2urT7Rniqc2KyNXxkyfPVeBEbr7ygsc0v0QNwzRxoc=; b=Ch3ZLATusWP5rDD296LE6kSOj6emM/1Vy8iEP+ZeGW39ZCPJTDLcFXEBj6o4O26WRC Vzv816nc/DZ0F7h6p05jIDkuBPOulzuyIhwABjXZOW8+wLM8nnrBlFeNG8rTSlEldXs2 mz4PEbwGMvpjxSqjT0am99crZpO8Ov/RxcuoU3l0N0MNFGYbACkZAjFxIySUIsCQP5Mw pz1h3g+dBq1iDPKZk+lfxzI297GpAst+KD+doJQHFcrxADA6gB1En8a4rNxSy6dJDRqX zlDV/Y+/MQLxNVJ3PTWyyC8vT5kZOmEFINpbADMpVAj4GtlRXvYpzlNKyATOwKE9hRJ1 bKJQ== X-Gm-Message-State: AJaThX48vE/r7tguelplpiIF5KP19YZ1KbrXEHmuz7olzMX0LyLFNV5Z +ZzVbzqNK83FHTOz72WN6x2Km2h4R/FZl9sR/M8PiNek X-Google-Smtp-Source: AGs4zMZuincY6BhfRTlDzHCAJihwC8jD5JjepZiCGp8xLEfMTRzbqI4WJ61ia+5iQHZqBMP5tTXeXq+DotB79+SGFjE= X-Received: by 10.31.89.7 with SMTP id n7mr5890960vkb.77.1510544929405; Sun, 12 Nov 2017 19:48:49 -0800 (PST) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-dev@lists.gentoo.org Reply-to: gentoo-dev@lists.gentoo.org MIME-Version: 1.0 Received: by 10.159.57.93 with HTTP; Sun, 12 Nov 2017 19:48:09 -0800 (PST) In-Reply-To: <88fa2503-11de-2f34-b4a9-58159f14a1ac@gentoo.org> References: <1508440120.19870.14.camel@gentoo.org> <26AE424C-19DF-4059-A7DE-8ED6D605FF2C@gentoo.org> <1508817879.1688.6.camel@gentoo.org> <1508818272.1688.7.camel@gentoo.org> <88fa2503-11de-2f34-b4a9-58159f14a1ac@gentoo.org> From: Gordon Pettey Date: Sun, 12 Nov 2017 21:48:09 -0600 Message-ID: Subject: Re: [gentoo-dev] Manifest2 hashes, take n+1-th: 3 hashes for the tie-breaker case To: gentoo-dev@lists.gentoo.org Content-Type: multipart/alternative; boundary="94eb2c07ec92ef4237055dd525db" X-Archives-Salt: 1c7e33d6-cd1a-4b95-8991-9d685178dd72 X-Archives-Hash: 51bcfd34ea18cae3a6ba3494c60e716d --94eb2c07ec92ef4237055dd525db Content-Type: text/plain; charset="UTF-8" On Sun, Nov 12, 2017 at 8:22 PM, Joshua Kinard wrote: > Minor clarification, old single core //and// uni-processor. Some older > machines have multiple physical CPUs that are single-core. Threading > should be > okay on these, as long as the thread count stays under NR_CPUS. > > I also have a really old single-CPU system, MIPS (obviously). Not the > fastest > on the block compared to the other equipment I've got, but does anyone > know of > any simple timing scripts/programs available that can benchmark some of > these > proposed digest hashes? If they turn out to be reasonably quick on my old > machine, I doubt then that speed will be too much of an issue. > Even on your "old single-CPU MIPS" system, what percentage of time is spent verifying manifest hashes compared to actually building/installing? The whole "slow and/or multiple hashes will cause problems" argument seems specious. --94eb2c07ec92ef4237055dd525db Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On S= un, Nov 12, 2017 at 8:22 PM, Joshua Kinard <kumba@gentoo.org>= wrote:
Minor clarification, old single c= ore //and// uni-processor.=C2=A0 Some older
machines have multiple physical CPUs that are single-core.=C2=A0 Threading = should be
okay on these, as long as the thread count stays under NR_CPUS.

I also have a really old single-CPU system, MIPS (obviously).=C2=A0 Not the= fastest
on the block compared to the other equipment I've got, but does anyone = know of
any simple timing scripts/programs available that can benchmark some of the= se
proposed digest hashes?=C2=A0 If they turn out to be reasonably quick on my= old
machine, I doubt then that speed will be too much of an issue.
=C2=A0
Even on your "old single-CPU MIPS" sys= tem, what percentage of time is
spent = verifying manifest hashes compared to actually building/installing?
The whole "slow and/or multiple hashes w= ill cause problems" argument
seem= s=20 specious.
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