Date: Sat, 30 Jun 2018 23:42:00 -0700 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: Trev <freebsd-arm@sentry.org>, freebsd-arm@freebsd.org Subject: Re: RPI3 swap experiments Message-ID: <5202FC09-B76A-4E03-BC2F-8144B505E0BA@yahoo.com> In-Reply-To: <20180701025354.GA49303@www.zefox.net> References: <20180627054027.GA22144@www.zefox.net> <CC72E766-03CB-476C-8F2B-DAAC266CE63D@yahoo.com> <20180627194217.GA27793@www.zefox.net> <C6303FC5-B412-472C-98E4-9A1E45C38535@yahoo.com> <20180628022457.GA30110@www.zefox.net> <7B9D272D-3EDE-46FA-8A1C-AEE65047167C@yahoo.com> <20180628163328.GA33408@www.zefox.net> <51e208b4-9f14-58f7-1e70-6ef8db2c0bed@sentry.org> <20180629155131.GA35717@www.zefox.net> <f842b145-c79b-161d-5282-992212f8296f@sentry.org> <20180701025354.GA49303@www.zefox.net>
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On 2018-Jun-30, at 7:53 PM, bob prohaska <fbsd at www.zefox.net> wrote: > On Sun, Jul 01, 2018 at 09:42:15AM +1000, Trev wrote: >> bob prohaska wrote on 30/06/2018 01:51: >>> On Fri, Jun 29, 2018 at 10:28:25PM +1000, Trev wrote: >>>> >>>> Jun 29 20:20:35 rpi3 kernel: pid 66844 (c++), uid 0, was killed: out of >>>> swap space >>>> >>>> At the time of "out of swap" only 157M of the 4G swap was in use. The >>>> 4GB swap partition is on a 4GB USB2 memory key (da1p1), everything else >>>> is on the sdcard. There are no excessively long ms/w being recorded. >>>> There are no USB or other related errors. >>>> >>> >>> That's a little surprising, and disturbing. By my experience your setup >>> should have run to completion. >>> >>> Do you see a "too much swap" complaint? I don't know if it's a problem, >>> but 4 GB of swap triggers one on my RPi3. 3 GB does not. 2 GB is enough >>> to finish -j4 buildworld. >> >> Jun 30 23:32:12 rpi3 kernel: pid 60735 (c++), uid 0, was killed: out of >> swap space >> >> No go with 2GB (I deleted the da0p1 swap partition; destroyed da0; then >> remade it it with a 2GB p1; then rebooted - no "too much swap" >> complaints). Out of swap with 56M of 2GB used. And this was with make >> -j2 buildworld. >> > It just crossed my mind that the successful -j4 buildworlds that used > USB swap (both mechanical and flash) separate from /usr and /var placed > the swap on a powered USB hub. It would be exceeding strange if that > proved helpful, but as things are going.... Power issues have been mentioned before in this exchange, but it can be more like what one might notice with a oscilloscope than with a Digital Multi-Meter. If the device sometimes (even very briefly) requires more than the rpi3 provides (voltage or current) the device will likely fail sometimes despite a DMM not showing anything interesting. The same device might work fine on a powered hub that always provides sufficient voltage and current (on all time scales involved). I've had these sorts of situations before. Without a proper set of instruments to monitor for power problems with, it is a pain to figure out for sure if such is what is going on. So I tend to use a powered hub for USB storage. > The other successful -j4 buildworlds put swap on the root microSD card. > I'd rate that a harder experiment, even if there is free space on the card. > My talents with gpart leave much to be desired. If you're properly gifted > it might also be worth trying. > > . . . === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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