The following is an example of the sampleproc program.

Here we run sampleproc for a few seconds on a workstation,

# ./sampleproc

Sampling at 100 hertz... Hit Ctrl-C to end.

^C

PID CMD COUNT

1659 mozilla-bin 3

109 nscd 4

2197 prstat 23

2190 setiathome 421

PID CMD PERCENT

1659 mozilla-bin 0

109 nscd 0

2197 prstat 5

2190 setiathome 93

The first table shows a count of how many times each process was sampled

on the CPU. The second table gives this as a percentage.

setiathome was on the CPU 421 times, which is 93% of the samples.

The following is sampleproc running on a server with 4 CPUs. A bash shell

is running in an infinate loop,

# ./sampleproc

Sampling at 100 hertz... Hit Ctrl-C to end.

^C

PID CMD COUNT

10140 dtrace 1

28286 java 1

29345 esd 2

29731 esd 3

2 pageout 4

29733 esd 6

10098 bash 1015

0 sched 3028

PID CMD PERCENT

10140 dtrace 0

28286 java 0

29345 esd 0

29731 esd 0

2 pageout 0

29733 esd 0

10098 bash 24

0 sched 74

The bash shell was on the CPUs for 24% of the time, which is consistant

with a CPU bound single threaded application on a 4 CPU server.

The above sample was around 10 seconds long. During this time, there were

around 4000 samples (checking the COUNT column), this is due to

4000 = CPUs (4) * Hertz (100) * Seconds (10).