mpstat

Mpstat reports per-processor statistics in tabular form. Each row of the table represents the activity of one processor. All values are rates (events per second) unless otherwise noted.

mpstat reports the following information:

CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl
  0  0    0    1    62    3  32   18    4    0   0 70889  22  78  0   0
  2  0    0    0    71    3  44   24    4    0   0 71157  23  77  0   0

CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl
  0  0    0    0    74    7  30   17    4    0   0 69732  23  77  0   0
  2  0    0    0    66    7  44   24    4    0   0 71116  20  80  0   0

In the above example the machine is reporting zero percent idle, this was traced to two orphaned processes.

CPU	processor ID
minf	minor faults
mjf	major faults
xcal	inter-processor cross-calls
intr	interrupts
ithr	interrupts as threads (not counting clock interrupt)
csw	context switches
icsw	involuntary context switches
migr	thread migrations (to another processor)
smtx	spins on mutexes (lock not acquired on first try)
srw	spins on readers/writer locks (lock not acquired on first try)
syscl	system calls
usr	percent user time
sys	percent system time
wt	percent wait time
idl	percent idle time