Understanding Perf tool output

I recently installed Perf tool On my platform and wanted to use it for profiling my platform. I started profiling a standalone application. Below is the command I used: perf start ./helloworld Performance counter stats for './helloworld': 4.555957 task-clock # 0.000 CPUs utilized 1 context-switches # 0.219 K/sec 0 cpu-migrations # 0.000 K/sec 124 page-faults # 0.027 M/sec cycles stalled-cycles-frontend stalled-cycles-backend instructions branches branch-misses 60.005519331 seconds time elapsed Now I am not sure how should I interpretate this output.is it as expected? Also, what should I make of `` field here, is there anything I need to enable to support this field before running the command?