perf stat ./myapp
and the result must be like this (it's just an example)
Performance counter stats for 'myapp':
83723.452481 task-clock:u (msec) # 1.004 CPUs utilized
0 context-switches:u # 0.000 K/sec
0 cpu-migrations:u # 0.000 K/sec
3,228,188 page-faults:u # 0.039 M/sec
229,570,665,834 cycles:u # 2.742 GHz
313,163,853,778 instructions:u # 1.36 insn per cycle
69,704,684,856 branches:u # 832.559 M/sec
2,078,861,393 branch-misses:u # 2.98% of all branches
83.409183620 seconds time elapsed
74.684747000 seconds user
8.739217000 seconds sys
Perf stat prints user time and system time, and the HW counter will be incremented whatever application the cpu executes.
For HW counters like cycles or instructions, does the perf count them only for "myapp"?
For instance, (cs for context switch)
|--------------------|-------|-------------------|------------|------------------|
myapp cs cs myapp cs cs end
inst 0 10 20 50 80 100
60 instructions for "myapp" , but the value of HW counter is 100, then does the perf stat prints out 60?
