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Tue, 12 Oct 2021 03:55:51 -0700 (PDT) From: zimoun In-Reply-To: <87czoay4sq.fsf@inria.fr> References: <87a6tdce94.fsf@inria.fr> <87mu4iv0gc.fsf@inria.fr> <87v9c0ap22.fsf_-_@gnu.org> <87wnmsn5lz.fsf_-_@gnu.org> <87bl44vfvg.fsf_-_@gmail.com> <87o880byyz.fsf@inria.fr> <87czoay4sq.fsf@inria.fr> Date: Tue, 12 Oct 2021 12:50:59 +0200 Message-ID: <86h7dmms8c.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 42162@debbugs.gnu.org, Maurice =?UTF-8?Q?Br=C3=A9mond?= , Maxim Cournoyer , andreas.enge@inria.fr Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1634037091; h=from:from:sender:sender: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:resent-cc: resent-from:resent-sender:resent-message-id:in-reply-to:in-reply-to: references:references:list-id:list-help:list-unsubscribe: list-subscribe:list-post:dkim-signature; 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spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Spam-Score: -0.21 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b=pFYQLbnZ; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Queue-Id: 17A86308B8 X-Spam-Score: -0.21 X-Migadu-Scanner: scn1.migadu.com X-TUID: ZDwNx0AX9/8m Hi Ludo, On Tue, 12 Oct 2021 at 11:24, Ludovic Court=C3=A8s wrote: > I sense a lot of impatience in your message :-), and I also see many > questions. It is up to us all to answer them, I=E2=80=99ll just reply > selectively here. Impatience? Probably. :-) > zimoun skribis: >> On Thu, 7 Oct 2021 at 18:07, Ludovic Court=C3=A8s wrote: > > [...] > >>> The second-best solution is to improve our tooling so we can actually >>> keep source code in a more controlled way. That=E2=80=99s what I had i= n mind >>> with . We have storage space for >>> that on berlin, but it=E2=80=99s not infinite. >> >> If Berlin has space, why so much derivations are missing when running >> time-machine? > > That=E2=80=99s not related to the question at hand, but it would be worth > investigating, first by trying to quantify that. The question seems related. :-) Because you are saying =E2=80=9Cwe have st= orage space for that on Berlin=E2=80=9D=E2=80=A6 > For the record, the =E2=80=98guix publish=E2=80=99 config on berlin is he= re: > > https://git.savannah.gnu.org/cgit/guix/maintenance.git/tree/hydra/modul= es/sysadmin/services.scm#n485 > > If I read that correctly, nars have a TTL of 180 days (this is the time > a nar is retained after the last time it has been requested, so it=E2=80= =99s a > lower bound.) =E2=80=A6and the NARs are more or less removed after 180 days if no one ask= ed for them during these 180 days, IIUC. This policy seems to keep under control the size of the storage, I guess. And I provide an annoying example of such policy. :-) Anyway, I agree it is not, for now, the core of the question at hand. :-) About quantifying, it is clearly not related to the question at hand. ;-) Just for the record, a back to envelope computations. 180 days before today was April 15th (M-x calendar C-u 180 C-b). It means 6996 commits (35aaf1fe10 is my current last commit). git log --format=3D"%cd" --after=3D2021-04-15 | wc -l 6996 However, these commits are pushed by batch. Roughly, it reads: git log --format=3D"%cd" --after=3D2021-04-15 --date=3Dunix \ | awk 'NR =3D=3D 1{old=3D $1; next}{print old - $1; old =3D $1}' \ | sort -n | uniq -c | grep -e "0$" | head 1 -1542620 3388 0 14 10 6 20 5 30 2 40 4 50 1 60 2 70 2 80 (Take the =E2=80=99awk=E2=80=99 with care, I am not sure of what I am doing= . :-) And, it is rough because timezone etc.) Other said 3388/6996=3D ~50% of commits are pushed at the same time, i.e., missed by both build farms using 2 different strategies to collect the thing to build (fetch every 5 minutes or fetch from guix-commits). It is a quick back to envelope so keep that with some salt. :-) On that number, after 180 days (6 months), it is hard to evaluate the rate of the time-machine queries. And from my experience (no number to back), running time-machine on a commit older than this 180 days implies to build derivations. Or it is a lucky day. :-) Drifting, right? Let focus on the question at hand. However, this question of long-term policy asked at: appears to me worth. :-) Cheers, simon