Solaris Application Programming, 1/e - Chapter 4 - Parent Directory

76 Chapter 4 Informational Tools
time: The time at which the sample was taken. In this case, the samples
were taken at one-second intervals.
lwp: The LWP that is being sampled. If the -f option is passed to cputrack,
it will follow child processes. In this mode, data from other LWPs will be
interleaved.
event: The event type, such as ticks or the exit line. Each tick event is the
number of events since the last tick. The exit line occurs when a process exits,
and it reports the total number of events that occurred over the duration of the
run. The event line also reports data at points where the process forks or joins.
pic0 and pic1: The last two columns report the number of events for the
two performance counters. If cputrack were rotating through performance
counters, the names of the performance counters would be reported
after a # sign.
It is also possible to attach cputrack to a running process. The option for this is
-p , and cputrack will report the events for that process.
4.4.5 Reporting Bus Activity (busstat)
The busstat tool reports performance counter events for the system bus. The
available performance counters are system-dependent. The -l option lists the
devices that have performance counter statistics available. The -e option will
query what events are available on a particular device.
The currently set performance counters can be read using the -r option. To
select particular performance counters it is necessary to use the -w option, but this
requires superuser privileges. An example of using busstat to measure memory
activity on an UltraSPARC T1-based system is shown in Example 4.35.
Example 4.35 Using busstat to Query Memory Activity on an UltraSPARC T1
# busstat -l
Busstat Device(s):
dram0 dram1 dram2 dram3 jbus0
# busstat -e dram0
pic0
mem_reads
mem_writes
....
pic1
mem_reads
mem_writes
...
# busstat -w dram0,pic0=mem_reads,pic1=mem_writes
time dev event0 pic0 event1 pic1
1 dram0 mem_reads 45697 mem_writes 8775
2 dram0 mem_reads 37827 mem_writes 3767