Date: Wed, 24 Feb 2021 14:26:20 +0000 From: Bob Bishop <rb@gid.co.uk> To: Thierry Thomas <thierry@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: The out-of-swap killer makes poor choices Message-ID: <500F4BE2-87C4-45F8-85A9-326498F47CC5@gid.co.uk> In-Reply-To: <YDZIuXCgcpbvm57d@graf.pompo.net> References: <CAOtMX2jYmrK7ftx62_NEfNCWS7O=giHKL1p9kXCqq1t5E1arxA@mail.gmail.com> <CAOtMX2i3Njo=KBP=99_G0%2BKuSa00CVgNvacmzhTaoZUYEhwPPA@mail.gmail.com> <YDYyQ1V/hEAGV%2ByJ@kib.kiev.ua> <1984125.0OzZcVfBr4@ravel> <YDZIuXCgcpbvm57d@graf.pompo.net>
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[-- Attachment #1 --] Hi, > On 24 Feb 2021, at 12:38, Thierry Thomas <thierry@freebsd.org> wrote: > > Le mer. 24 févr. 21 à 13:02:14 +0100, Olivier Certner <olivier.freebsd@free.fr> > écrivait : > >> Hi, > > Hello, > >> 2 to 3 years ago, I stumbled against production problems on servers doing >> heavy computations. Only a few processes (2 generally) were doing them, and >> most of the time consumed less than 1/4 of the available RAM (2 GiB). Apart >> from that, no other process was allocating any significant amount of memory. >> Only some base default daemons (syslogd, cron) and sshd were running. >> Occasionally, very big jobs would come, and one or more of these processes >> would start eating up all available memory, until FreeBSD decided that it was >> time to take action. > > For such cases, another solution exists on Linux to dynamically enlarge > the swap partition (something like dphys-swapfile or SwapSpace - see > <https://github.com/Tookmund/Swapspace>; ), but I do not know if such a > tool exists on FreeBSD? You can of course add swap to a running system using swapon(8), but I have no idea whether this will improve behaviour if the system is already low on resources. > -- > Th. Thomas. -- Bob Bishop rb@gid.co.uk [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQR+a6Wh87I/iYwcbE+8xpPppLfFvwUCYDZiDAAKCRC8xpPppLfF v6H2AKCGszzAPANOMH0st0NkTjrNc1VcZQCfcK2VMcf0P9pIsLZuR5xnHx2u6qs= =sT/v -----END PGP SIGNATURE-----
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