dtrace discuss - Apr 2006 - A script to calculate process running percentage in multi-cpu

Hi, Expert

I made a script to calculate running percentage for one process in
multiple cpu. I use sched:::on-cpu and sched:::off-cpu to collect the
process running time. After some time, I divide process running time by
the interval to get process running percentage in different cpu. Do you
think if it works? Thanks for your comments. Attached is the script

#!/usr/sbin/dtrace -s

#pragma D option quiet

inline int MYPID      = $1;
inline int INTERVAL   = $2;
inline int COUNTS     = $3;

dtrace:::BEGIN
{
	secs = INTERVAL;
	counts = COUNTS;

	printf("Sampling %d with interval %d and counts %d...\n", MYPID,
secs, counts);
}

 /* Record the start time of a thread */
 sched:::on-cpu,
 sched:::remain-cpu
 /pid == MYPID/
 {
	cpustart[cpu, execname] = timestamp;
	start[execname] = timestamp;
 }

 /* Save the elapsed time of a thread */
 sched:::off-cpu,
 sched:::remain-cpu,
 profile:::profile-1sec
 /pid == MYPID/
 {
	/* save elapsed */
	this->elapsed = timestamp - cpustart[cpu, execname];
	@Procs[execname] = sum(timestamp - start[execname]);
	@CPUProcs[cpu, execname] = sum(this->elapsed);
	@PercCPUProcs[cpu, execname] = sum(this->elapsed / INTERVAL /
1000000);

 }

 profile:::tick-1sec
 {
	secs--;
 }

 /* Print time */
 profile:::tick-1sec
 /secs == 0/
 {
	printf("%Y,\n", walltimestamp);
 }

 /* Print report */
 profile:::tick-1sec
 /secs == 0/
 {
	printf("%16s %16s\n", "THREADS", "TIME (ns)");
	printa("%16s %@16d\n", @Procs);
  trunc(@Procs);
	printf("\n%16s %16s %16s\n", "CPU", "THREADS",
"TIME (ns)");
	printa("%16d %16s %@16d\n", @CPUProcs);
  trunc(@CPUProcs);
	printf("\n%16s %16s %16s\n", "CPU", "THREADS",
"%TIME");
	printa("%16d %16s %@16d\n", @PercCPUProcs);
  trunc(@PercCPUProcs);

	secs = INTERVAL;
	counts--;
 }

 /* End of program */
 profile:::tick-1sec
 /counts == 0/
 {
	exit(0);
 }

 /* cleanup for Ctrl-C */
 dtrace:::END
 {
	trunc(@Procs);
  trunc(@CPUProcs);
  trunc(@PercCPUProcs);
 }


Best Regards
Leslie (Wang Qi)