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UBC parameter units

Revision as of 16:22, 29 April 2011 by MaymeOvermyer (talk | contribs) (Overriding default units)


  1. entries which name has word 'page' are measured in memory pages (4K on x86 and x86_64, 16K for IA64). These are privvmpages, oomguarpages and others.
  2. entries with names like 'num*' are measured in items. i.e. numproc - number of processes, numiptent - number of iptables entries.
  3. other entries like kmemsize, tcprcvbuf, tcpsndbuf are measured in bytes

Overriding default units

When using vzctl to set beancounter parameters, you can set units explicitly when appropriate (i.e. for all parameters which names are not starting with num*). The following suffixes are available:

g, G gigabytes
m, M megabytes
k, K kilobytes
p, P memory pages

Examples of freelance writing

  • Set kmemsize limit to 512 Kb
# vzctl set $CTID --kmemsize 512k
  • Set privvmpages limit to 256 Mb
# vzctl set $CTID --privvmpages 256m
  • Set tcprcvbuf limit to 1000 pages (totals to almost 4 Mb on x86)
# vzctl set $CTID --tcprcvbuf 1000p