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Re: Need help analyzing (kernel?) memory usage and reclaiming RAM (Debian Stretch)




On Mon, Apr 15, 2019 at 04:35:27PM +0300, Reco wrote:
> Can you please provide unsorted outputs of /proc/meminfo? It's easier to
> compare them if they are unsorted.
> And "smem -tm | tail" would be helpful too.

Thanks for your input!

The system from my previous example has already been rebooted, sorry!
But here's from another system that currently starts showing the same
problem and has an equally small workload:

------------------------------------------------------------------------
root@rad-wgv-srv01:~# free -thwl
              total        used        free      shared     buffers       cache   available
Mem:           987M        843M         72M        1,1M        9,7M         61M         37M
Low:           987M        914M         72M
High:            0B          0B          0B
Swap:          2,0G         75M        1,9G
Total:         3,0G        919M        2,0G
root@rad-wgv-srv01:~# cat /proc/meminfo
MemTotal:        1010976 kB
MemFree:           73980 kB
MemAvailable:      38756 kB
Buffers:            9964 kB
Cached:            50340 kB
SwapCached:         2728 kB
Active:            58776 kB
Inactive:          15164 kB
Active(anon):      11068 kB
Inactive(anon):     3696 kB
Active(file):      47708 kB
Inactive(file):    11468 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       2097148 kB
SwapFree:        2019416 kB
Dirty:               104 kB
Writeback:             0 kB
AnonPages:         13048 kB
Mapped:            19904 kB
Shmem:              1120 kB
Slab:              90744 kB
SReclaimable:      13100 kB
SUnreclaim:        77644 kB
KernelStack:        2700 kB
PageTables:         3764 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2602636 kB
Committed_AS:     155208 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      925568 kB
DirectMap2M:      122880 kB
root@rad-wgv-srv01:~# smem -tm | tail
/bin/bash                                    3      358     1076 
/lib/systemd/systemd                         3      386     1158 
/lib/x86_64-linux-gnu/libc-2.24.so          33       54     1783 
/usr/lib/x86_64-linux-gnu/libcrypto.so.1     5      386     1933 
/usr/bin/python2.7                           1     2220     2220 
/lib/systemd/libsystemd-shared-232.so        5      544     2723 
<anonymous>                                 33      146     4848 
[heap]                                      33      304    10060 
-----------------------------------------------------------------
179                                        922    11110    41011 
root@rad-wgv-srv01:~# ps aux --sort=-rss | head -15
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root     61714  0.0  0.6  95180  6676 ?        Ss   16:35   0:00 sshd: msch [priv]
msch     61716  0.0  0.5  64832  5852 ?        Ss   16:35   0:00 /lib/systemd/systemd --user
msch     61723  0.0  0.4  95452  4996 ?        S    16:35   0:00 sshd: msch@pts/0
msch     61724  0.2  0.4  23636  4924 pts/0    Ss   16:35   0:00 -bash
root     62015  1.0  0.4  23740  4892 pts/0    S    16:36   0:00 -bash
root         1  0.0  0.4  57128  4440 ?        Ss   Mär29  14:30 /lib/systemd/systemd --system --deserialize 19
root     62014  0.0  0.3  51964  3836 pts/0    S    16:36   0:00 sudo -i
root     62040  0.0  0.3  41164  3584 pts/0    R+   16:37   0:00 ps aux --sort=-rss
root       228  0.1  0.2 136620  2884 ?        Ss   Mär29  31:20 /usr/bin/vmtoolsd
root       224  0.0  0.2  55556  2560 ?        Ss   Mär29  13:48 /lib/systemd/systemd-journald
root       411  0.0  0.2  46520  2408 ?        Ss   Mär29   6:40 /lib/systemd/systemd-logind
message+   419  0.0  0.1  45200  1332 ?        Ss   Mär29   6:39 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
msch     61717  0.0  0.1  82652  1268 ?        S    16:35   0:00 (sd-pam)
_chrony    531  0.0  0.1  29980  1184 ?        S    Mär29   0:52 /usr/sbin/chronyd
root@rad-wgv-srv01:~# uname -a
Linux rad-wgv-srv01 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3 (2019-02-02) x86_64 GNU/Linux
root@rad-wgv-srv01:~# 

------------------------------------------------------------------------
(any other commands I should repeat on the new system?)

Thanks
Martin

-- 
Martin Schwarz * Karlsruhe, Germany * http://kuroi.de/