What does it mean if we see swpq-sz > 150 and %swpocc at 100%?
(Doc ID 1951933.1)
Last updated on JANUARY 19, 2022
Applies to:
Solaris Operating System - Version 8.0 and laterInformation in this document applies to any platform.
Goal
Why do we see permanently swpocc at 100% in sar?
# sar -qSunOS <hostname> 5.10 Generic_150401-05 i86pc 11/24/2014
00:00:00 runq-sz %runocc swpq-sz %swpocc
14:30:00 1.5 18 201.9 100
14:40:00 1.5 22 201.0 100
14:50:00 1.3 16 201.0 100
Average 1.5 17 200.1 100
Solaris will swap out threads in case of a memory shortage and these threads will be listed on the swap queue.
sar -q will show the length of the swap queue (swpg-sz) and a percent value for swpocc :
sar(1)
--------------------------------------------------------------------------------
-q Reports average queue length while occupied,
and percent of time occupied:
runq-sz, %runocc Run queue of kernel
threads in memory and
runnable
swpq-sz, %swpocc Swap queue of processes
--------------------------------------------------------------------------------
swpocc is part of the sysinfo structure. The value will be checked and updated every second among others like runque, runocc etc.
If the value for %swpocc is constantly at 100% it is nothing to worry about. As it only means, that we have at least 1 thread in the swap queue during the measured interval.
Solution
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In this Document
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