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Old 06-16-2013, 06:01 AM   #1
supermega
LQ Newbie
 
Registered: Jun 2013
Posts: 6

Rep: Reputation: Disabled
Strange memory usage in OpenVZ


Hi,

I run a host machine with Debian squeeze and 6 VEs. I have a problem with memory usage: system is showing much more memory used than is used by all running processes. A /usr/bin/top snapshot:
Code:
top - 10:35:11 up 5 min,  1 user,  load average: 0.16, 0.22, 0.09
Tasks:  11 total,   1 running,  10 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:    516096k total,   486624k used,    29472k free,        0k buffers
Swap:        0k total,        0k used,        0k free,        0k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      20   0  8356  764  636 S  0.0  0.1   0:00.00 init
  220 root      20   0 54156 1452 1052 S  0.0  0.3   0:00.00 rsyslogd
  246 root      20   0 20900  840  636 S  0.0  0.2   0:00.00 cron
  266 root      20   0 70580 3408 2604 S  0.0  0.7   0:00.12 sshd
  268 root      20   0 17712 1932 1440 S  0.0  0.4   0:00.02 bash
 4148 root      20   0 49176 1124  568 S  0.0  0.2   0:00.00 sshd
 5031 root      20   0 71328 2852 1432 S  0.0  0.6   0:00.00 apache2
 5033 www-data  20   0 71060 1964  564 S  0.0  0.4   0:00.00 apache2
 5037 www-data  20   0  287m 3232 1464 S  0.0  0.6   0:00.00 apache2
 5096 www-data  20   0  287m 2608  956 S  0.0  0.5   0:00.00 apache2
 5125 root      20   0 18940 1228  984 R  0.0  0.2   0:00.03 top
I used a minimal debian template and installed apache2. When I run a simple process (aptitude install php5) I get:
Code:
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
Aborted
Increasing memory limit solves the problem partially - I can run my processes but memory usage is still too high.

On host machine (VE0) situation is strange too, /usr/bin/top sorted by memory usage:
Code:
top - 12:57:49 up 94 days,  4:59,  1 user,  load average: 0.08, 0.05, 0.07
Tasks: 151 total,   1 running, 150 sleeping,   0 stopped,   0 zombie
Cpu(s): 16.9%us,  7.3%sy,  0.0%ni, 75.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1411104k total,  1350608k used,    60496k free,   180424k buffers
Swap:  7811064k total,   143096k used,  7667968k free,   686264k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 4148 root      20   0  143m  70m 1308 S 14.3  5.1   1095:57 ruby
 4154 root      20   0  130m  54m 1916 S  0.0  4.0   2:40.37 ruby
 3379 108       20   0  354m  41m 7016 S  0.0  3.0   1:04.42 mysqld
 7154 sshd      20   0  144m  33m 6000 S  0.0  2.5   0:08.17 php
 2202 ntp       20   0  237m  14m 2760 S  0.0  1.1 168:33.61 mysqld
 4159 root      20   0 57284  13m  876 S  2.7  1.0 371:17.80 ruby
 3502 www-data  20   0  155m  13m 7716 S  0.0  0.9   0:00.05 php5-cgi
23295 root      20   0  149m  10m 6232 S  0.0  0.8   1:29.26 apache2
 3617 www-data  20   0  156m 7716 1860 S  0.0  0.5   0:00.01 php5-cgi
 3620 www-data  20   0  156m 7716 1860 S  0.0  0.5   0:00.01 php5-cgi
 3623 www-data  20   0  156m 7700 1776 S  0.0  0.5   0:00.01 php5-cgi
 3618 www-data  20   0  156m 7628 1776 S  0.0  0.5   0:00.01 php5-cgi
 3619 www-data  20   0  156m 7628 1776 S  0.0  0.5   0:00.01 php5-cgi
 3621 www-data  20   0  156m 7628 1776 S  0.0  0.5   0:00.01 php5-cgi
17509 sshd      20   0  765m 7608 2896 S  0.3  0.5 343:11.47 asterisk
 1215 sshd      20   0  233m 6616 2196 S  0.0  0.5 127:01.24 mysqld
 3952 ntp       20   0  170m 6364  912 S  0.3  0.5  80:16.10 mysqld
 5105 www-data  20   0  149m 5996 1108 S  0.0  0.4   0:00.00 apache2
 5106 www-data  20   0  149m 5456  612 S  0.0  0.4   0:00.00 apache2
 5107 www-data  20   0  149m 5456  612 S  0.0  0.4   0:00.00 apache2
 5108 www-data  20   0  149m 5456  612 S  0.0  0.4   0:00.00 apache2
 5109 www-data  20   0  149m 5456  612 S  0.0  0.4   0:00.00 apache2
12084 root      20   0 20792 3664 1604 S  0.0  0.3   0:00.28 bash
20531 root      20   0 70580 3408 2604 S  0.0  0.2   0:00.13 sshd
12021 root      20   0 70488 3360 2620 S  0.0  0.2   0:00.12 sshd
25943 www-data  20   0  287m 3264 1464 S  0.0  0.2   0:00.00 apache2
25937 root      20   0 71328 2852 1432 S  0.0  0.2   0:00.04 apache2
26002 www-data  20   0  287m 2768 1092 S  0.0  0.2   0:00.00 apache2
 3614 root      20   0 70384 2604  888 S  0.0  0.2   0:02.62 sendmail-mta
 3495 root      20   0 32624 2172 1584 S  0.0  0.2   0:02.76 ntpd
 3482 www-data  20   0 31224 2116  876 S  0.0  0.1   0:01.78 nginx
 2919 root      20   0 52896 2020 1192 S  0.0  0.1   0:01.98 rsyslogd
25939 www-data  20   0 71060 1964  564 S  0.0  0.1   0:00.00 apache2
20537 root      20   0 17712 1932 1440 S  0.0  0.1   0:00.02 bash
 4076 sshd      20   0  696m 1900  960 S  0.0  0.1   6:35.18 asterisk
However, OpenVZ Web Panel 2.1 shows "Memory usage 34%, 470.3 MB of 1.3 GB / 907.7 MB free".

What's the problem?

VE conf:
Code:
ONBOOT="yes"

# UBC parameters (in form of barrier:limit)
KMEMSIZE="14372700:14790164"
LOCKEDPAGES="256:256"
PRIVVMPAGES="129024:129024"
SHMPAGES="21504:21504"
NUMPROC="240:240"
PHYSPAGES="0:9223372036854775807"
VMGUARPAGES="33792:9223372036854775807"
OOMGUARPAGES="26112:9223372036854775807"
NUMTCPSOCK="360:360"
NUMFLOCK="188:206"
NUMPTY="16:16"
NUMSIGINFO="256:256"
TCPSNDBUF="1720320:2703360"
TCPRCVBUF="1720320:2703360"
OTHERSOCKBUF="1126080:2097152"
DGRAMRCVBUF="262144:262144"
NUMOTHERSOCK="360:360"
DCACHESIZE="3409920:3624960"
NUMFILE="9312:9312"
AVNUMPROC="180:180"
NUMIPTENT="128:128"

# Disk quota parameters (in form of softlimit:hardlimit)
DISKSPACE="9999360:9999360"
DISKINODES="2000000:2200000"
QUOTATIME="0"

# CPU fair sheduler parameter
CPUUNITS="1000"

VE_ROOT="/var/lib/vz/root/$VEID"
VE_PRIVATE="/var/lib/vz/private/$VEID"
OSTEMPLATE="debian-6.0-amd64-minimal"
ORIGIN_SAMPLE="basic"
IP_ADDRESS="1.2.3.4"
Kernel (from apt): Linux vps 2.6.32-5-openvz-amd64 #1 SMP Mon Jan 9 21:16:36 UTC 2012 x86_64 GNU/Linux

Last edited by supermega; 06-16-2013 at 06:43 AM.
 
Old 06-16-2013, 12:01 PM   #2
gdr
Member
 
Registered: Jun 2013
Distribution: Mint KDE
Posts: 34

Rep: Reputation: Disabled
Look at the output of

Code:
cat /proc/user_beancounters
and see where failcnt > 0
 
Old 06-16-2013, 01:14 PM   #3
supermega
LQ Newbie
 
Registered: Jun 2013
Posts: 6

Original Poster
Rep: Reputation: Disabled
Here's my /proc/user_beancounters at VE0:
Code:
Version: 2.5
       uid  resource                     held              maxheld              barrier                limit              failcnt
      106:  kmemsize                  2754822              3981512             14372700             14790164                    0
            lockedpages                     0                   16                  256                  256                    0
            privvmpages                119729               129025               129024               129024                   29
            shmpages                       67                  707                21504                21504                    3
            dummy                           0                    0                    0                    0                    0
            numproc                        62                   70                  240                  240                    0
            physpages                    1972                37697                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                 1972                37697                26112  9223372036854775807                    0
            numtcpsock                      3                    6                  360                  360                    0
            numflock                        1                    7                  188                  206                    0
            numpty                          0                    2                   16                   16                    0
            numsiginfo                      0                    2                  256                  256                    0
            tcpsndbuf                   52320                    0              1720320              2703360                    0
            tcprcvbuf                   49152               218136              1720320              2703360                    0
            othersockbuf                    0                16648              1126080              2097152                    0
            dgramrcvbuf                     0                 2312               262144               262144                    0
            numothersock                   13                   16                  360                  360                    0
            dcachesize                 108929               184778              3409920              3624960                    0
            numfile                      1004                 1223                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
      105:  kmemsize                  4615419             12629613             14372700             14790164                    0
            lockedpages                     0                   16                  256                  256                    0
            privvmpages                 60679               131605               129024               129024                    2
            shmpages                       18                 7714                21504                21504                    6
            dummy                           0                    0                    0                    0                    0
            numproc                        34                   69                  240                  240                    0
            physpages                    4994                54361                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                11648                54361                26112  9223372036854775807                    0
            numtcpsock                      4                   39                  360                  360                    0
            numflock                        4                   12                  188                  206                    0
            numpty                          0                    2                   16                   16                    0
            numsiginfo                      0                   11                  256                  256                    0
            tcpsndbuf                   69760              1724512              1720320              2703360               865086
            tcprcvbuf                   65536               219400              1720320              2703360                    0
            othersockbuf                 9248                78608              1126080              2097152                    0
            dgramrcvbuf                     0                 2312               262144               262144                    0
            numothersock                   18                   52                  360                  360                    0
            dcachesize                 257797               374437              3409920              3624960                    0
            numfile                       830                 1608                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
      102:  kmemsize                  5876757             14373386             14372700             14790164                   12
            lockedpages                     0                  227                  256                  256                   49
            privvmpages                111962               140133               129024               129024              3467671
            shmpages                       11                 4828                21504                21504                    0
            dummy                           0                    0                    0                    0                    0
            numproc                        40                   78                  240                  240                    0
            physpages                   16668                81064                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                16672                81064                26112  9223372036854775807                    1
            numtcpsock                      7                  169                  360                  360                    0
            numflock                        5                   11                  188                  206                    0
            numpty                          0                    7                   16                   16                    0
            numsiginfo                      1                   40                  256                  256                    0
            tcpsndbuf                  122080              1514704              1720320              2703360                    0
            tcprcvbuf                  114688               278064              1720320              2703360                    0
            othersockbuf                27744                72600              1126080              2097152                    0
            dgramrcvbuf                     0                 2312               262144               262144                    0
            numothersock                   31                   59                  360                  360                    0
            dcachesize                 240192               647766              3409920              3624960                    0
            numfile                       810                 1673                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
      104:  kmemsize                  4268482              7299605             14372700             14790164                    0
            lockedpages                     0                    0                  256                  256                    0
            privvmpages                 47948                57086               394240               394240                    0
            shmpages                        0                 2352                21504                21504                    0
            dummy                           0                    0                    0                    0                    0
            numproc                        44                   60                  240                  240                    0
            physpages                    2234                18533                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                10374                18533                26112  9223372036854775807                    0
            numtcpsock                      3                   11                  360                  360                    0
            numflock                        4                    6                  188                  206                    0
            numpty                          0                    1                   16                   16                    0
            numsiginfo                      4                    7                  256                  256                    0
            tcpsndbuf                   52320                    0              1720320              2703360                    0
            tcprcvbuf                   49152                    0              1720320              2703360                    0
            othersockbuf                 7960                41520              1126080              2097152                    0
            dgramrcvbuf                     0                 4360               262144               262144                    0
            numothersock                   19                   40                  360                  360                    0
            dcachesize                 418176               470016              3409920              3624960                    0
            numfile                      1156                 1745                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
      103:  kmemsize                  2792682              7260863             14372700             14790164                    0
            lockedpages                     0                    0                  256                  256                    0
            privvmpages                 14602                32735               385024               385024                    0
            shmpages                        1                 3361                21504                21504                    0
            dummy                           0                    0                    0                    0                    0
            numproc                        18                   91                  240                  240                    0
            physpages                    1231                18400                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                 2793                18687                26112  9223372036854775807                    0
            numtcpsock                      6                   17                  360                  360                    0
            numflock                        1                    3                  188                  206                    0
            numpty                          0                    1                   16                   16                    0
            numsiginfo                      1                    3                  256                  256                    0
            tcpsndbuf                  104640              1419312              1720320              2703360                    0
            tcprcvbuf                   98304               217544              1720320              2703360                    0
            othersockbuf                43928                73656              1126080              2097152                    0
            dgramrcvbuf                     0                 2312               262144               262144                    0
            numothersock                   37                   66                  360                  360                    0
            dcachesize                 245701               316549              3409920              3624960                    0
            numfile                       629                 1617                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
        1:  kmemsize                  5766841             10959887             14372700             14790164                    0
            lockedpages                     0                    0                  256                  256                    0
            privvmpages                 59687                86575               655360               696320                    0
            shmpages                        1                 2689                21504                21504                    0
            dummy                           0                    0                    0                    0                    0
            numproc                        52                   85                  240                  240                    0
            physpages                    9420                26436                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                22925                37915                26112  9223372036854775807                    0
            numtcpsock                      6                   16                  360                  360                    0
            numflock                        4                    8                  188                  206                    0
            numpty                          0                    3                   16                   16                    0
            numsiginfo                      5                   10                  256                  256                    0
            tcpsndbuf                  104640              1286200              1720320              2703360                    0
            tcprcvbuf                   98304               218272              1720320              2703360                    0
            othersockbuf                19752               100112              1126080              2097152                    0
            dgramrcvbuf                     0                 4360               262144               262144                    0
            numothersock                   37                   65                  360                  360                    0
            dcachesize                 470016               546048              3409920              3624960                    0
            numfile                      1505                 2260                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
        0:  kmemsize                  6903894             14107360  9223372036854775807  9223372036854775807                    0
            lockedpages                     0                    0  9223372036854775807  9223372036854775807                    0
            privvmpages                 53180                73576  9223372036854775807  9223372036854775807                    0
            shmpages                      685                 3405  9223372036854775807  9223372036854775807                    0
            dummy                           0                    0  9223372036854775807  9223372036854775807                    0
            numproc                        75                  156  9223372036854775807  9223372036854775807                    0
            physpages                   37080                47862  9223372036854775807  9223372036854775807                    0
            vmguarpages                     0                    0  9223372036854775807  9223372036854775807                    0
            oomguarpages                42935                53726  9223372036854775807  9223372036854775807                    0
            numtcpsock                     20                   54  9223372036854775807  9223372036854775807                    0
            numflock                        3                    7  9223372036854775807  9223372036854775807                    0
            numpty                          1                    5  9223372036854775807  9223372036854775807                    0
            numsiginfo                      2                  131  9223372036854775807  9223372036854775807                    0
            tcpsndbuf                  372912               901232  9223372036854775807  9223372036854775807                    0
            tcprcvbuf                  327680              5110848  9223372036854775807  9223372036854775807                    0
            othersockbuf                32368               188792  9223372036854775807  9223372036854775807                    0
            dgramrcvbuf                     0                 2312  9223372036854775807  9223372036854775807                    0
            numothersock                   37                  109  9223372036854775807  9223372036854775807                    0
            dcachesize                1393033              1660418  9223372036854775807  9223372036854775807                    0
            numfile                      2392                 3485  9223372036854775807  9223372036854775807                    0
            dummy                           0                    0  9223372036854775807  9223372036854775807                    0
            dummy                           0                    0  9223372036854775807  9223372036854775807                    0
            dummy                           0                    0  9223372036854775807  9223372036854775807                    0
            numiptent                      10                   10  9223372036854775807  9223372036854775807                    0
What does it mean?
 
Old 06-16-2013, 01:26 PM   #4
gdr
Member
 
Registered: Jun 2013
Distribution: Mint KDE
Posts: 34

Rep: Reputation: Disabled
http://wiki.openvz.org/Proc/user_beancounters

Quote:
The field failcnt shows the number of refused “resource allocations” for the whole lifetime of the process group.
clearly, in container 102 there is not enough VM pages - you need to increase "privvmpages" allocation.
 
Old 06-16-2013, 03:55 PM   #5
supermega
LQ Newbie
 
Registered: Jun 2013
Posts: 6

Original Poster
Rep: Reputation: Disabled
privvmpages seems OK - 129024*4 KB = 504 MB. Should be enough to run apache2. And if it's too low why would it cause my RAM to disappear? Now I've restarted VE106:
# top
Code:
top - 20:45:57 up  1:23,  1 user,  load average: 0.00, 0.00, 0.00
Tasks:   7 total,   1 running,   6 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:    516096k total,    35948k used,   480148k free,        0k buffers
Swap:        0k total,        0k used,        0k free,        0k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      20   0  8356  780  648 S  0.0  0.2   0:00.04 init
  221 root      20   0 54164 1452 1048 S  0.0  0.3   0:00.00 rsyslogd
  247 root      20   0 20908  852  648 S  0.0  0.2   0:00.00 cron
  253 root      20   0 49176 1132  584 S  0.0  0.2   0:00.00 sshd
  847 root      20   0 70580 3424 2624 S  0.0  0.7   0:00.05 sshd
  850 root      20   0 17720 1912 1424 S  0.0  0.4   0:00.02 bash
  981 root      20   0 18940 1228  984 R  0.0  0.2   0:00.00 top
# /etc/init.d/apache2 start

# /top
Code:
top - 20:46:10 up  1:23,  1 user,  load average: 0.00, 0.00, 0.00
Tasks:  11 total,   1 running,  10 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:    516096k total,   485244k used,    30852k free,        0k buffers
Swap:        0k total,        0k used,        0k free,        0k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      20   0  8356  780  648 S  0.0  0.2   0:00.04 init
  221 root      20   0 54164 1452 1048 S  0.0  0.3   0:00.00 rsyslogd
  247 root      20   0 20908  852  648 S  0.0  0.2   0:00.00 cron
  253 root      20   0 49176 1132  584 S  0.0  0.2   0:00.00 sshd
  847 root      20   0 70580 3424 2624 S  0.0  0.7   0:00.05 sshd
  850 root      20   0 17720 1912 1424 S  0.0  0.4   0:00.02 bash
  992 root      20   0 71328 2848 1432 S  0.0  0.6   0:00.00 apache2
  994 www-data  20   0 71060 1960  564 S  0.0  0.4   0:00.00 apache2
  997 www-data  20   0  287m 2604  956 S  0.0  0.5   0:00.00 apache2
  998 www-data  20   0  287m 2608  960 S  0.0  0.5   0:00.00 apache2
 1063 root      20   0 18936 1140  904 R  0.0  0.2   0:00.00 top
As you can see 4 apache2 processes that take together 2% of RAM made my memory usage to rise from 35948k to 485244k. After starting apache2 I don't get any failcnt for this VE:
Code:
Version: 2.5
       uid  resource                     held              maxheld              barrier                limit              failcnt
      106:  kmemsize                  3251836              3772962             14372700             14790164                    0
            lockedpages                     0                    0                  256                  256                    0
            privvmpages                121239               122020               129024               129024                    0
            shmpages                      707                  707                21504                21504                    0
            dummy                           0                    0                    0                    0                    0
            numproc                        65                   70                  240                  240                    0
            physpages                    2651                 3141                    0  9223372036854775807                    0
            vmguarpages                     0                    0                33792  9223372036854775807                    0
            oomguarpages                 2651                 3141                26112  9223372036854775807                    0
            numtcpsock                      4                    5                  360                  360                    0
            numflock                        1                    2                  188                  206                    0
            numpty                          1                    1                   16                   16                    0
            numsiginfo                      0                    2                  256                  256                    0
            tcpsndbuf                   69760                    0              1720320              2703360                    0
            tcprcvbuf                   65536                    0              1720320              2703360                    0
            othersockbuf                    0                16648              1126080              2097152                    0
            dgramrcvbuf                     0                 2312               262144               262144                    0
            numothersock                   14                   16                  360                  360                    0
            dcachesize                 119232               129600              3409920              3624960                    0
            numfile                      1113                 1198                 9312                 9312                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                  128                  128                    0
 
  


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