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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--Apple-Mail=_CDE4075F-BFD0-4BB3-965F-0290FF30EDF0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi, > On 24 Feb 2021, at 12:38, Thierry Thomas <thierry@freebsd.org> wrote: >=20 > Le mer. 24 f=C3=A9vr. 21 =C3=A0 13:02:14 +0100, Olivier Certner = <olivier.freebsd@free.fr> > =C3=A9crivait : >=20 >> Hi, >=20 > Hello, >=20 >> 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. >=20 > 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 --Apple-Mail=_CDE4075F-BFD0-4BB3-965F-0290FF30EDF0 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQR+a6Wh87I/iYwcbE+8xpPppLfFvwUCYDZiDAAKCRC8xpPppLfF v6H2AKCGszzAPANOMH0st0NkTjrNc1VcZQCfcK2VMcf0P9pIsLZuR5xnHx2u6qs= =sT/v -----END PGP SIGNATURE----- --Apple-Mail=_CDE4075F-BFD0-4BB3-965F-0290FF30EDF0--
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