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dcachesize possible issue? [message #50896] Mon, 25 November 2013 12:41 Go to previous message
daniel_vz is currently offline  daniel_vz
Messages: 2
Registered: November 2013
Junior Member
Hello everyone,

I noticed today a possible issue with one of my VPSes.

It shows an abnormal value for dcachesize.

Current limits are as follows:

----------------------------------------------------------------
CT 103       | HELD Bar% Lim%| MAXH Bar% Lim%| BAR | LIM | FAIL
-------------+---------------+---------------+-----+-----+------
     kmemsize|10.5G   -    - |15.5G   -    - |   - |   - |    -
  lockedpages|   -    -    - |  20K   -    - |   - |   - |    -
  privvmpages| 249M   -    - |1.28G   -    - |   - |   - |    -
     shmpages|92.9M   -    - | 151M   -    - |   - |   - |    -
      numproc|  32    -    - |  75    -    - |   - |   - |    -
    physpages|11.2G   -   70%|  16G   -  100%|   - |  16G|    -
  vmguarpages|   -    -    - |   -    -    - |   - |   - |    -
 oomguarpages| 147M   -    - | 262M   -    - |   - |   - |    -
   numtcpsock|  14    -    - | 117    -    - |   - |   - |    -
     numflock|   2    -    - |  39    -    - |   - |   - |    -
       numpty|   -    -    - |   3    -    - |   - |   - |    -
   numsiginfo|   -    -    - |  27    -    - |   - |   - |    -
    tcpsndbuf| 553K   -    - |4.23M   -    - |   - |   - |    -
    tcprcvbuf|2.16M   -    - |26.6M   -    - |   - |   - |    -
 othersockbuf|27.1K   -    - |1.05M   -    - |   - |   - |    -
  dgramrcvbuf|   -    -    - |9.03K   -    - |   - |   - |    -
 numothersock|  59    -    - | 129    -    - |   - |   - |    -
   dcachesize|10.5G   -    - |15.5G   -    - |   - |   - |    -
      numfile|1.53K   -    - |1.94K   -    - |   - |   - |    -
    numiptent|  24    -    - |  24    -    - |   - |   - |    -
    swappages|3.81M   -  0.2%| 126M   -    6%|   - |   2G|    -
----------------------------------------------------------------



There are no failcnts and the machine is up and running for a month now. Restarting the web and php-fpm servers didn't do much to lower the value. Is this metric supposed to stay that way all the time or it does decrease automatically?

Looking at open files usage I don't see something which accounts for that high of a value.

Currently running the following kernel on the host:

Linux CentOS-64-64-minimal 2.6.32-042stab081.5 #1 SMP Mon Sep 30 16:52:24 MSK 2013 x86_64 x86_64 x86_64 GNU/Linux

Mon Nov 25 15:31:41 2013                                                                                                                                                                                                            ftop 1.0
Processes:  24 total, 1 unreadable                                                                                                                                                                           Press h for help, o for options
Open Files: 35 regular, 0 dir, 53 chr, 0 blk, 22 pipe, 67 sock, 17 misc

_  PID    #FD  USER      COMMAND
-- 10882  17   root      nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.confnginx: worker process
|  +- err  --W  --        0/0        /var/log/nginx/error.log (fd 4 for PID 10882)
|  +- 4    --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 5    --W  >-   141626/141626   /var/log/nginx/access.log (fd 5 for PID 10883)
|  +- 6    --W  --   442029/442029   /var/log/nginx/website/access.log (fd 6 for PID 10883)
|  +- 7    --W  --    40.3M/0        /var/log/nginx/website/error.log (fd 7 for PID 10883)
-- 10883  15   nginx     nginx: worker process
|  +- err  --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 4    --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 5    --W  >-   141626/141626   /var/log/nginx/access.log (fd 5 for PID 10882)
|  +- 6    --W  --   442029/442029   /var/log/nginx/website/access.log (fd 6 for PID 10882)
|  +- 7    --W  --    40.3M/0        /var/log/nginx/website/error.log (fd 7 for PID 10882)
-- 10884  15   nginx     nginx: worker process
|  +- err  --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 4    --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 5    --W  >-   141626/141626   /var/log/nginx/access.log (fd 5 for PID 10882)
|  +- 6    --W  --   442029/442029   /var/log/nginx/website/access.log (fd 6 for PID 10882)
|  +- 7    --W  --    40.3M/0        /var/log/nginx/website/error.log (fd 7 for PID 10882)
-- 10885  15   nginx     nginx: worker process
|  +- err  --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 4    --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 5    --W  >-   141626/141626   /var/log/nginx/access.log (fd 5 for PID 10882)
|  +- 6    --W  --   442029/442029   /var/log/nginx/website/access.log (fd 6 for PID 10882)
|  +- 7    --W  --    40.3M/0        /var/log/nginx/website/error.log (fd 7 for PID 10882)
-- 10887  15   nginx     nginx: worker process
|  +- err  --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 4    --W  --        0/0        /var/log/nginx/error.log (stderr from PID 10882)
|  +- 5    --W  >-   141626/141626   /var/log/nginx/access.log (fd 5 for PID 10882)
|  +- 6    --W  --   442029/442029   /var/log/nginx/website/access.log (fd 6 for PID 10882)
|  +- 7    --W  --    40.3M/0        /var/log/nginx/website/error.log (fd 7 for PID 10882)
-- 119    10   root      /sbin/udevd -d
|  +- 10   -rw  --     1053/1053     /dev/.udev/queue.bin
-- 401    5    root      /sbin/rsyslogd -i /var/run/syslogd.pid -c 5
|  +- out  --W  --      206/206      /var/log/messages
|  +- err  --W  --     9927/9927     /var/log/cron
|  +- 3    -r-  --        0/0        /proc/kmsg
|  +- 4    --W  --     6103/6103     /var/log/secure
-- 438    6    root      sendmail: accepting connectionssendmail: Queue runner@01:00:00 for /var/spool/clientmqueuecrond
|  +- 5    --w  --       32/32       /var/run/sendmail.pid
-- 446    5    smmsp     sendmail: Queue runner@01:00:00 for /var/spool/clientmqueuecrond
|  +- 4    --w  --       48/48       /var/run/sm-client.pid
-- 473    6    root      crond
|  +- 3    -rw  --        4/4        /var/run/crond.pid
-- 10904  11   root      php-fpm: master process (/etc/php-fpm.conf)sshd: app [priv]
   +- err  --W  --     2052/2052     /var/log/php-fpm/error.log (fd 5 for PID 10904)
   +- 5    --W  --     2052/2052     /var/log/php-fpm/error.log (stderr from PID 10904)



No zombie processes that hold open files.

[root@app /]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/ploop46926p1      20G  8.3G   11G  44% /
none                  3.0G  4.0K  3.0G   1% /dev
[root@app /]# df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/ploop46926p1    1282560  144098 1138462   12% /
none                  786432     151  786281    1% /dev


I'm nowhere near the available free space in the VPS.

[root@CentOS-64-64-minimal conf]# vzcfgvalidate 103.conf
Validation completed: success


VPS is running CentOS 6.4 just like the host system. Is this an OpenVZ matter or the guest system is caching more files than I would like?

Any help is appreciated.
 
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