Hi Stijn,
On Sep 5, 2011, at 16:24, Stijn De Weirdt wrote:
> hi all,
>
> we are having an "issue" with some SL61 nodes. after a reboot, free reports 1.4GB of memory in use, of which 24+163=187MB buffers+cache.
>
> i'm unable to identify what is holding the memory, and i'd like to know if others see this too and how i could proceed to find the culprit.
yes, we see this as well. On a 48 GB system without users or special processes:
# free -m
total used free shared buffers cached
Mem: 48388 1374 47013 0 30 186
-/+ buffers/cache: 1157 47231
In /proc/meminfo, I find that the difference to what I'd consider reasonable (and see on a 48GB SL5 system) is due to slabs.
A "slabtop -s c" reveals that it's a "size-2097152" pool accounting for this. Do you see this as well?
Cheers,
Stephan
>
> (it is a 32core/64GB machine; kernel commandline has crashkernel=128M@16M (but no difference then eg crashkernel=auto and kdump is off))
>
> many thanks,
>
>
> stijn
>
> free
> # free -m
> total used free shared buffers cached
> Mem: 64554 1604 62949 0 24 166
> -/+ buffers/cache: 1413 63140
> Swap: 16394 0 16394
>
>
> mem sorted top
>
> top - 16:13:52 up 13 min, 1 user, load average: 0.00, 0.01, 0.01
> Tasks: 694 total, 1 running, 693 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
> Mem: 66103768k total, 1643336k used, 64460432k free, 25164k buffers
> Swap: 16787916k total, 0k used, 16787916k free, 170552k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 2788 root 20 0 37988 25m 2876 S 0.0 0.0 0:00.06 pbs_mom
> 2653 root 20 0 159m 12m 1472 S 0.0 0.0 0:00.19 ncm-cdispd
> 2643 root 20 0 138m 5604 840 S 0.0 0.0 0:00.00 cdp-listend
> 3276 root 20 0 120m 4156 3232 S 0.0 0.0 0:00.07 sshd
> 2620 root 20 0 745m 3788 1764 S 0.0 0.0 0:00.12 automount
> 3102 nslcd 20 0 427m 2936 488 S 0.0 0.0 0:00.00 nslcd
> 3301 root 20 0 103m 1688 1336 S 0.0 0.0 0:00.05 bash
> 3623 root 20 0 13528 1604 844 R 0.3 0.0 0:00.14 top
> 1 root 20 0 21416 1544 1240 S 0.0 0.0 0:06.23 init
> 2482 root 20 0 194m 1484 1108 S 0.0 0.0 0:00.14 qlgc_dsc
> 2325 root 20 0 242m 1412 928 S 0.0 0.0 0:00.04 rsyslogd
> 2459 rpcuser 20 0 23112 1168 884 S 0.0 0.0 0:00.00 rpc.statd
> 2606 root 18 -2 10956 1144 412 S 0.0 0.0 0:00.03 udevd
> 3164 nscd 20 0 583m 1132 788 S 0.0 0.0 0:00.02 nscd
> 2697 root 20 0 62040 1064 464 S 0.0 0.0 0:00.00 sshd
> 943 root 16 -4 10960 1052 316 S 0.0 0.0 0:00.12 udevd
> 2607 root 18 -2 10956 1052 320 S 0.0 0.0 0:00.00 udevd
> 2723 root 20 0 112m 1012 380 S 0.0 0.0 0:00.00 crond
> 2707 root 20 0 22488 992 752 S 0.0 0.0 0:00.03 xinetd
> 2439 rpc 20 0 18940 908 672 S 0.0 0.0 0:00.04 rpcbind
> 2568 dbus 20 0 23448 876 604 S 0.0 0.0 0:00.01 dbus-daemon
> 2972 nagios 20 0 37096 796 452 S 0.0 0.0 0:00.00 nrpe
--
Stephan Wiesand
DESY -DV-
Platanenallee 6
15738 Zeuthen, Germany
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