Run vmstat
#=> update every 1 second
$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
15 0 2852 46686812 279456 1401196 0 0 0 0 0 0 0 0 100 0
16 0 2852 46685192 279456 1401196 0 0 0 0 2136 36607 56 33 11 0
15 0 2852 46685952 279456 1401196 0 0 0 56 2150 36905 54 35 11 0
15 0 2852 46685960 279456 1401196 0 0 0 0 2173 36645 54 33 13 0
<snip>
Meaning of each field
procs
- r - processes on run queue (running processes + runnable processes)
- b - processes in uninterruptible sleep (TASK_UNINTERRUPTIBLE, marked as D in ps
command)
memory
- swpd - virtual memory used (KB) (to be confirmed)
- free - idle memory (KB)
- buff - memory used as buffers (KB)
- cache - memory used as cache (KB)
swap
- si - memory swapped in from disk (KB/s)
- so - memory swapped out to disk (KB/s)
io
- bi - blocks received from a block device (blocks/s)
- bo - blocks sent to a block device (blocks/s)
system
- in - interrupts, including the clock (/s)
- cs - context switches (/s)
cpu
- us - time spent running non-kernel code (%)
- sy - time spent running kernel code (%)
- id - time spent idle (%)
- wa - time spent waiting for IO (%)