Date: Thu, 11 Jan 2024 10:23:25 +0100 From: Ronald Klop <ronald@FreeBSD.org> To: Lexi Winter <lexi@le-fay.org>, freebsd-current@freebsd.org Subject: Re: poudriere: swap_pager: out of swap space Message-ID: <94c6cf1b-10e4-49c4-aa1d-e87f8e8c3d09@FreeBSD.org> In-Reply-To: <ZZ9Qn1W4k8UKnT6W@ilythia.eden.le-fay.org> References: <ZZ9Qn1W4k8UKnT6W@ilythia.eden.le-fay.org>
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On 1/11/24 03:21, Lexi Winter 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. My first guess would be that you are using a tmpfs tmp dir which uses swap as the backing-storage which is now full. Configure poudriere with USE_TMPFS=no to prevent this. Hope this helps. Regards, Ronald.
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