Date: Thu, 28 Nov 2024 22:15:54 -0500 From: Dennis Clarke <dclarke@blastwave.org> To: Current FreeBSD <freebsd-current@freebsd.org> Subject: Re: top seems confused about memory ? Message-ID: <24f1e839-d312-4ff0-b655-9a6bd185a0b8@blastwave.org> In-Reply-To: <64c81235-7871-4c44-bef2-95210f12bf86@blastwave.org> References: <64c81235-7871-4c44-bef2-95210f12bf86@blastwave.org>
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On 11/28/24 21:25, Dennis Clarke wrote:
>
> On a machine here I see top reports this with " top -CSITa -s 10"
>
>
> last pid: 6680; load averages: 0.29, 0.12, 0 up 0+11:40:46
> 02:23:01
> 51 processes: 2 running, 47 sleeping, 2 waiting
> CPU: 0.6% user, 0.0% nice, 0.2% system, 0.0% interrupt, 99.2% idle
> Mem: 587M Active, 480G Inact, 1332K Laundry, 7410M Wired, 456M Buf, 11G
> Free
> ARC: 3624M Total, 85M MFU, 3359M MRU, 32M Anon, 118M Header, 27M Other
> 2919M Compressed, 32G Uncompressed, 11.13:1 Ratio
> Swap: 32G Total, 32G Free
>
> THR USERNAME THR PRI NICE SIZE RES STATE C TIME CPU
> COMMAND
> 100003 root 40 187 ki31 0B 640K CPU0 0 464.8H 3967.69%
> [idle]
> 101142 root 1 48 0 1530M 574M piperd 34 0:27 24.69%
> /usr/lo
> 100000 root 731 -16 - 0B 11M parked 18 112:10 3.14%
> [kernel
> 102993 root 1 21 0 30M 15M select 26 0:03 2.77%
> /usr/bi
>
> Seems only 11G of memory is free ?
>
> That seems impossible.
>
> titan# sysctl hw.physmem
> hw.physmem: 549599244288
> titan#
>
> titan#
> titan# sysctl -a | grep 'free' | grep 'mem'
> vm.uma.vmem.stats.frees: 0
> vm.uma.vmem.keg.domain.1.free_slabs: 0
> vm.uma.vmem.keg.domain.1.free_items: 0
> vm.uma.vmem.keg.domain.0.free_slabs: 0
> vm.uma.vmem.keg.domain.0.free_items: 0
> vm.uma.vmem_btag.stats.frees: 523236
> vm.uma.vmem_btag.keg.domain.1.free_slabs: 0
> vm.uma.vmem_btag.keg.domain.1.free_items: 34398
> vm.uma.vmem_btag.keg.domain.0.free_slabs: 0
> vm.uma.vmem_btag.keg.domain.0.free_items: 34378
> vm.kmem_map_free: 528152154112
> kstat.zfs.misc.arcstats.memory_free_bytes: 11707904000
> titan#
>
> I have no idea what "top" is reporting but 11G free on a machine doing
> nothing seems ... unlikely.
>
>
even worse ... under load it seems to make no sense at all :
last pid: 98884; load averages: 32.01, 30.51, 25 up 0+12:33:20
03:15:35
172 processes: 34 running, 136 sleeping, 2 waiting
CPU: 78.4% user, 0.0% nice, 1.8% system, 0.0% interrupt, 19.8% idle
Mem: 7531M Active, 450G Inact, 9588K Laundry, 27G Wired, 456M Buf, 14G Free
ARC: 17G Total, 7543M MFU, 4337M MRU, 37M Anon, 260M Header, 5005M Other
7207M Compressed, 24G Uncompressed, 3.39:1 Ratio
Swap: 32G Total, 32G Free
THR USERNAME THR PRI NICE SIZE RES STATE C TIME CPU
COMMAND
100003 root 40 187 ki31 0B 640K RUN 0 486.9H 792.70%
[idle]
103554 root 1 156 i0 786M 632M CPU37 37 0:44 99.82%
/usr/bi
101148 root 1 156 i0 1317M 822M CPU2 2 2:20 99.82%
/usr/bi
--
--
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
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