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Wednesday, 15 February 2012

How to check the "Run Queue and Swap Queue Size"

# sar -q 5 3

The above command is used to determine the Run Queue and Swap Queue Size.

We can find the number of threads/process waiting in the run queue using the "vmstat" command. But the above would give much more visibility in terms of % of time the run and swap queue was occupied.

runq-sz : Shows average no.of threads present in run queue.

%runocc : Percentage of time the run queue was occupied.

swap-sz : Shows average no.of threads present in the swap queue.

%swapocc : Percentage of time the swap queue was occupied.

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