Date: Mon, 22 Nov 2010 10:27:50 +0100 From: Olivier Smedts <olivier@gid0.org> To: Guido Falsi <mad@madpilot.net> Cc: freebsd-current@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: tmpfs out of space (ZFS related?) Message-ID: <AANLkTimKk8hNiuDv20bTEamF5AXZ-CqwhhE-SGFRu343@mail.gmail.com> In-Reply-To: <20101122085934.GA21572@megatron.madpilot.net> References: <icc2ih$e5t$1@dough.gmane.org> <AANLkTi=Aw3KQqeDy1Bxn7tJrsvOn-D=y-ChCOpVu4E8N@mail.gmail.com> <20101121214720.356984cc@core.draftnet> <AANLkTimaKY0t4mGtsncSC9dV5SkUdfE%2BMWY5=4F=Xi7X@mail.gmail.com> <AANLkTin1QBZF6KnryEe13-rAk%2BBJOw6uUbyyWq1ef3Co@mail.gmail.com> <icc77q$mo$1@dough.gmane.org> <AANLkTi=aUKiJvLToM6PX0Nsc-tEtNZdzHgWAsJNVr-2T@mail.gmail.com> <iccaau$c3s$1@dough.gmane.org> <20101122085934.GA21572@megatron.madpilot.net>
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2010/11/22 Guido Falsi <mad@madpilot.net>: > On Mon, Nov 22, 2010 at 12:34:53AM +0100, Ivan Voras wrote: >> On 11/22/10 00:28, Paul B Mahol wrote: >> >> >Find way to reproduce it 100%. >> >> The way I described it can be used to reproduce the problem 100%. >> Detailed instructions for a test case would be something like this: >> >> 0) configure a system with tmpfs for /tmp >> 1) install PostgreSQL 9.0, use a ZFS file system for the database >> 2) install and use pgbench to initialize a database as large as >> physical memory (i.e. it will blow away all caches) >> 3) run pgbench with -c of around 10 or so, let it run for 5 minutes or s= o >> 4) stop PostgreSQL, observe reported free memory statistics etc. > > I have seen the same issue, with tmpfs reporting no space. > > I can see it happen regularly when I have big virtualbox machines > running which take most of the physical mem. I have the same problem : FreeBSD 8-STABLE amd64 ZFS v15 as root filesystem /tmp is a tmpfs 2 GB RAM 1.5GB ARC for ZFS When compiling "big" ports (like www/firefox), ARC fills wired memory, and /tmp show 0B available. make fails because it uses /tmp. If I lower ARC size to 1GB, the same port has no problems to compile. > > Here I have seen it on an 8GB machine with al ZFS when running 3-4 VMs > taking 1 or 2 GBs each,(cumulatively taking around 7). > > I imagine this is even easier to trigger on machine with less RAM. > > -- > Guido Falsi <mad@madpilot.net> > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= " > --=20 Olivier Smedts=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=A0 _ =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 ASCII ribbon campaign ( ) e-mail: olivier@gid0.org=A0 =A0 =A0 =A0 - against HTML email & vCards=A0 X www: http://www.gid0.org=A0 =A0 - against proprietary attachments / \ =A0 "Il y a seulement 10 sortes de gens dans le monde : =A0 ceux qui comprennent le binaire, =A0 et ceux qui ne le comprennent pas."
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