Editing Proc/user beancounters

{{UBC toc}}
{{DISPLAYTITLE:/proc/user_beancounters}}
The proc filesystem entry showing resource control information is <code>/proc/user_beancounters</code> file. An example content of <code>/proc/user_beancounters</code> is shown below.

== Example ==
<pre>
# cat /proc/user_beancounters
Version: 2.5
       uid  resource           held    maxheld    barrier      limit    failcnt
       123: kmemsize         836919    1005343    2752512    2936012          0
            lockedpages           0          0         32         32          0
            privvmpages        4587       7289      49152      53575          0
            shmpages             39         39       8192       8192          0
            dummy                 0          0          0          0          0
            numproc              20         26         65         65          0
            physpages          2267       2399          0 2147483647          0
            vmguarpages           0          0       6144 2147483647          0
            oomguarpages       2267       2399       6144 2147483647          0
            numtcpsock            3          3         80         80          0
            numflock              3          4        100        110          0
            numpty                1          1         16         16          0
            numsiginfo            0          1        256        256          0
            tcpsndbuf             0          0     319488     524288          0
            tcprcvbuf             0          0     319488     524288          0
            othersockbuf       6684       7888     132096     336896          0
            dgramrcvbuf           0       8372     132096     132096          0
            numothersock          8         10         80         80          0
            dcachesize        87672      92168    1048576    1097728          0
            numfile             238        306       2048       2048          0
            dummy                 0          0          0          0          0
            dummy                 0          0          0          0          0
            dummy                 0          0          0          0          0
            numiptent            10         16        128        128          0
</pre>

== Fields ==

The field '''<code>uid</code>''' is a numeric identifier of the container<ref>The name “uid” is related to the fact that OpenVZ Resource Management can be used without virtualization and containers.</ref>.

For accountable parameters, the field '''<code>held</code>''' shows the current counter for the container (resource “usage”), and the field '''<code>maxheld</code>''' shows the counter's maximum for the last accounting period. The accounting period is usually the lifetime of the container<ref>The lifetime of a container is the period from the start of the container till the time all processes in the container exited and all resources used by these processes are freed. Usually, the lifetime is just the time between the start and the stop of the container.</ref>. 

The field '''<code>failcnt</code>''' shows the number of refused “resource allocations” for the whole lifetime of the process group.

The '''<code>barrier</code>''' and '''<code>limit</code>''' fields are resource control settings. For some
parameters, only one of them may be used, for some parameters — both.
These fields may specify limits or guarantees, and the exact meaning of
them is parameter-specific. Description of each parameter in [[UBC parameters]]
contains information about the difference between the <code>barrier</code> and
the <code>limit</code> for the parameter.

== Units ==
{{Main|UBC parameter units}}

== Settings ==

General notes about parameters and their barrier and limit settings
are provided in [[UBC parameters]]. Parameters not having limit setting have
[[LONG_MAX]] in the corresponding field.

== Reading ==

{{Note|It's easier to use [[BC proc entries|the new <code>/proc/bc</code> interface]], i.e. <code>cat /proc/bc/$CTID/resources</code>.}}

If you want to print UBC values for a specific container, the following construct can be helpful

  <nowiki>egrep -A23 "${CTID}:" /proc/user_beancounters</nowiki>

Or with headers, though slightly harder to remember:

  <nowiki>sed -nr "1,2p;/${CTID}:/,+23p" /proc/user_beancounters</nowiki>

Here <code>${CTID}</code> is the ID of the container you are interested in.

In case you want to print UBC values for a few containers at once, set CTID to something like <code>(101|102|103)</code>.

== Notes ==
<references/>