Date: Sat, 14 Sep 2019 18:23:09 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: Mark Millard <marklmi@yahoo.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: spurious out of swap kills Message-ID: <tkrat.3e7072a5bf9138a2@FreeBSD.org> In-Reply-To: <9A2342FC-D168-485A-9918-0109F9CD1646@yahoo.com>
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On 13 Sep, Mark Millard wrote: > Don Lewis truckman at FreeBSD.org wrote on > Thu Sep 12 23:00:19 UTC 2019 : > > . . . >> Nevertheless, I see these errors, >> with rustc being the usual victim: >> >> Sep 11 23:21:43 zipper kernel: pid 16581 (rustc), jid 43, uid 65534, was killed: out of swap space >> Sep 12 02:48:23 zipper kernel: pid 1209 (rustc), jid 62, uid 65534, was killed: out of swap space > . . . > > Unfortunately, the wording of this type of message is a misnomer for > what drives the kills: it is actually driven by being unable to gain > more free memory but FreeBSD will not swap-out processes that stay > runnable (or are running), only ones that are waiting. Even a single > process that stays runnable and keeps lots of RAM in the active > category can lead to kills when swap is unused or little used. So the > kill-behavior is very workload dependent. > > Real "out of swap" conditions tend to also have messages > similar to: > > Aug 5 17:54:01 sentinel kernel: swap_pager_getswapspace(32): failed > > If you are not seeing such messages, then it is likely that > the mount of swap space still free is not the actual thing > driving the kills. > > Are you seeing "swap_pager_getswapspace(32): failed" messages? > > (It used to be that the system simply leaves the dirty pages in > memory when a swap_pager_getswapspace failed message is produced. > Of itself, it did not cause a kill. I do not know about now.) I'm only getting the "out of swap" error. Yes, it is misleading because there are still tens of GB of free swap.home | help
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