Date: Mon, 19 Oct 2020 16:33:32 +0000 (UTC) From: doug@safeport.com To: "Steve O'Hara-Smith" <steve@sohara.org> Cc: Doug Hardie <bc979@lafn.org>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: FreeBSD using swap even though there's a lot of free memory Message-ID: <alpine.BSF.2.21.9999.2010191551060.72530@fledge.watson.org> In-Reply-To: <20201016212841.0864fb91b9f2e72e1246bbfa@sohara.org> References: <5f885b772d622_95aa2adab2b9c5b41576495c3@sirportly-app-02.mail> <CAHu1Y72pNNXt-i552F2JT%2ButhqAMjQdXLoRNofw6Xr0iwenjVw@mail.gmail.com> <20201016195546.a3392f971837aa2eeace1325@sohara.org> <89B99A9E-C3A2-47BE-8A0E-D296846946CB@mail.sermon-archive.info> <20201016212841.0864fb91b9f2e72e1246bbfa@sohara.org>
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On Fri, 16 Oct 2020, Steve O'Hara-Smith wrote: > On Fri, 16 Oct 2020 13:24:13 -0700 > Doug Hardie <bc979@lafn.org> wrote: > >> I encountered this issue a year or so ago. In my case it turned out to >> be a process that was allocating anonymous segments using mmap. > > Now that's an interesting one - thank you for mentioning it. Neither is the case for me. A 'real' swapfile and no paging. I have a range of FreeBSD versions with the kind of workload using up swap space. For me only the 11.1 system does this. The current numbers below show some "lost" space but the unaccounted for space is a relative small amount. Device 1K-blocks Used Avail Capacity /dev/aacd0p3 4194304 1776000 2418304 42% [ 0 50861 ] root [ 20 281903 ] camden [ 21 322759 ] bassharbor [ 19 343522 ] monhegan [ 18 369139 ] newharbor [ 17 587332 ] pemaquid Jails: 1904655 total: 1955516 I wrote a program to track this in real time as several weeks ago the system ran out of swap space. Numbers are from top.
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