Article ID: 128087, created on Jan 18, 2016, last review on Jan 18, 2016

  • Applies to:
  • Operations Automation 6.0
  • Operations Automation 5.5


There is a difference between real RAM usage in container and the usage reported by OACI: for example, OACI can show 5 Mb memory usage in a Linux container, while free utility from inside the container shows correct memory usage.


Since OACI 5.5 update 8 and PCS 6 update 8 memory usage is reported as

usage = guest.ram.usage - guest.ram.cached

These values come from prlctl statistics tool:

# prlctl statistics 101
    guest.ram.usage:        53
    guest.ram.cached:       47

guest.ram.cached is a Cached value in /proc/meminfo from inside the virtual environment, and it includes shared memory as well as usual caches. If a virtual environment actively uses Shmem (for example, PostgreSQL instance is running inside), OACI will report memory usage incorrectly.


OACI memory calculation will be redesigned in scope of feature request POA-91401. Please contact your TAM/PTA to trace the status of the issue.

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