Date: Mon, 5 Mar 2018 10:33:32 -0800 From: bob prohaska <fbsd@www.zefox.net> To: Mike <the.lists@mgm51.com> Cc: freebsd-arm@freebsd.org, bob prohaska <fbsd@www.zefox.net> Subject: Re: Is maximum swap usage tunable? Message-ID: <20180305183331.GB47820@www.zefox.net> In-Reply-To: <637a406a-feba-23dc-be3c-d71d839503f7@mgm51.com> References: <20180228214301.GA29481@www.zefox.net> <b82801b8-bc29-414c-1170-621bb4a5d937@mgm51.com> <CANCZdfq_MpxjUyVd-=%2BMiAQAER4TeDh9irhx_evdXwa3yt3h0g@mail.gmail.com> <20180303162605.GA41874@www.zefox.net> <20180304182831.GA44154@www.zefox.net> <CANCZdfpcccDuhJh4EF0C4KFz=dcN5mWvQ9aMiyF53kD=hMzy3Q@mail.gmail.com> <1520189171.38056.2.camel@freebsd.org> <20180304214003.GB44154@www.zefox.net> <20180305045723.GA47820@www.zefox.net> <637a406a-feba-23dc-be3c-d71d839503f7@mgm51.com>
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On Mon, Mar 05, 2018 at 09:59:15AM -0500, Mike wrote: > On 3/4/2018 11:57 PM, bob prohaska wrote: > > On Sun, Mar 04, 2018 at 01:40:03PM -0800, bob prohaska wrote: > >> make -j4 buildworld > >[snip] > > > I tried a buildworld using spinning rust for swap connected via USB" > > ======== > > /usr/bin/make -j3 buildworld > > > [lots of output omitted, can be supplied if needed] [even more output omitted] > > -I/usr/src/contrib/llvm/tools/clang/include -I/usr/src/lib/clang/include > -I/usr/src/contrib/llvm/include -DLLVM_BUILD_GLOBAL_ISEL > -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS > -DLLVM_DEFAULT_TARGET_TRIPLE=\"aarch64-unknown-freebsd12.0\" > -DLLVM_HOST_TRIPLE=\"aarch64-unknown-freebsd12.0\" > -DDEFAULT_SYSROOT=\"/usr/obj/usr/src/arm64.aarch64/tmp\" > -ffunction-sections -fdata-sections -gline-tables-only -MD > -MF.depend.Sema_SemaExprObjC.o -MTSema/SemaExprObjC.o -Qunused-arguments > -I/usr/obj/usr/src/arm64.aarch64/tmp/legacy/usr/include -std=c++11 > -fno-exceptions -fno-rtti -gline-tables-only -stdlib=libc++ > -Wno-c++11-extensions -c > /usr/src/contrib/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp -o > Sema/SemaExprObjC.o > > Killed > *** [all_subdir_lib/clang/libclang] Error code 137 Error 137 was common on my system when USB flash swap was used, but I don't recall seeing it when microSD swap alone was in use and the system ran out of swap > [further snippage] > > > > >From /var/log/messages > > Mar 4 23:32:39 rpi3 kernel: pid 27325 (c++), uid 0, was killed: out of > swap space > Mar 4 23:32:54 rpi3 kernel: pid 27322 (c++), uid 0, was killed: out of > swap space > Mar 4 23:32:54 rpi3 kernel: pid 27387 (c++), uid 0, was killed: out of > swap space > Mar 4 23:32:54 rpi3 kernel: pid 24978 (make), uid 0, was killed: out of > swap space > Mar 4 23:32:54 rpi3 kernel: pid 757 (qmgr), uid 125, was killed: out of > swap space > Make seems to take a while to figure out something's wrong... my system behaves similarly. > > # swapctl -l > Device: 1024-blocks Used: > /dev/md99 1048576 13248 > > ======= > Was swapctl run during the swap shortage, or after? In my observation swap seems to be freed very quickly once make gives up, a few seconds usually. Catching the swap shortage at its peak seems to require either watchful waiting at a top window or more clever logging than I know how to implement. Running gstat into a log file records device activity, which is interesting, but one still has to rake through the log. > > I plan to try again, same hardware but with 2GB swap space. > Please post what you learn... bob prohaska
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