Date: Thu, 11 Jan 2024 18:02:58 +0900 From: Tomoaki AOKI <junchoon@dec.sakura.ne.jp> To: freebsd-current@freebsd.org Subject: Re: poudriere: swap_pager: out of swap space Message-ID: <20240111180258.ad42faf5d5ff05c8c80a30c6@dec.sakura.ne.jp> In-Reply-To: <ZZ9Qn1W4k8UKnT6W@ilythia.eden.le-fay.org> References: <ZZ9Qn1W4k8UKnT6W@ilythia.eden.le-fay.org>
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On Thu, 11 Jan 2024 02:21:19 +0000 Lexi Winter <lexi@le-fay.org> wrote: > hi list, > > i'm having a recurring problem with poudriere that i hope someone might > have an idea about. > > i'm building packages with poudriere on a system with 32GB memory, with > tmpfs and md disabled in poudriere (so it's using ZFS only) and with the > ZFS ARC limited to 8GB. > > running poudriere produces many kernel log messages like this: > > Jan 10 21:40:00 ilythia kernel: swap_pager: out of swap space > Jan 10 21:40:00 ilythia kernel: swp_pager_getswapspace(2): failed > Jan 10 22:41:55 ilythia kernel: swap_pager: out of swap space > Jan 10 22:41:55 ilythia kernel: swp_pager_getswapspace(21): failed > Jan 10 23:48:03 ilythia kernel: swap_pager: out of swap space > Jan 10 23:48:03 ilythia kernel: swp_pager_getswapspace(8): failed > Jan 11 00:05:00 ilythia kernel: swp_pager_getswapspace(1): failed > Jan 11 00:21:45 ilythia kernel: swp_pager_getswapspace(10): failed > > this is despite the system having a large amount of "Inact" memory > according to top(1): > > Mem: 3828M Active, 15G Inact, 2921M Laundry, 9263M Wired, 1559M Buf, 892M Free > ARC: 3113M Total, 994M MFU, 884M MRU, 39M Anon, 49M Header, 1139M Other > 1296M Compressed, 4130M Uncompressed, 3.19:1 Ratio > Swap: 2048M Total, 2048M Used, 8192B Free, 99% Inuse > > from what i can tell, these swap errors don't cause any issues with the > poudriere build, but they do seem to hinder interactive usage by causing > long hangs. > > does anyone have some idea what's going on here? i don't really > understand why the system has used 100% of available swap space when it > has plenty of Inact memory it could free to fulfill requirements. I'm currently building www/chromium, consuming 23.1GiB of memory and 11.4GiB of swap in use. 32GiB of physical memory but not intentionally limiting ZFS arc. If you don't build such a large ports, you could lower the number of poudriere jail with option -J, for example, from auto-tuned value to reduce memory usage. FYI: When chromium built around 87%, with USE_TMPFS=yes. 172 processes: 16 running, 156 sleeping CPU: 91.2% user, 1.5% nice, 6.7% system, 0.6% interrupt, 0.0% idle Mem: 13G Active, 1670M Inact, 6499M Laundry, 6985M Wired, 347K Buf, 3490M Free ARC: 3183M Total, 393M MFU, 2102M MRU, 2980K Anon, 34M Header, 643M Other 1826M Compressed, 3471M Uncompressed, 1.90:1 Ratio Swap: 64G Total, 12G Used, 53G Free, 18% Inuse -- Tomoaki AOKI <junchoon@dec.sakura.ne.jp>
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