Inside the system: resources, kernel, processes

Quiz: CPU, memory and OOM

Question 3 of 8

Read the output

A machine with one CPU. What does vmstat show?

$ vmstat 1 3
procs -----------memory---------- ---swap-- -----io---- -system-- -------cpu-------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st gu
 1  0      0  34216  17204 277612    0    0 10790   609  668   16 19 17 63  1  0  0
 3  0      0  10324  17204 294784    0    0   500     4 1054 1223 96  3  1  0  0  0
 3  0      0  10316  17204 294784    0    0     0     0 1038 1153 99  1  0  0  0  0

Three processes wait for the disk — the machine has slow storage.
Three processes need the CPU, and at any moment two of them wait in the queue.
The CPU is idle — 63% in the first line.

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