Perf benchmark

Overview

Using perf_event_open to get hardware and software counters.
Only useful when you want to measure something inside the code really quick.
Otherwise, use perf itself.
Linux only.
All predefined hardware and software counters are generated in the header
file, you can uncomment counters as you wish.
If some counters or combination of counters doesnt work or doesn't work as
expected, please check out performance counter register allocation
documentation for your CPU. CPUs have limited registers for performance
counters and some counters can use specific registers only.
Just copy sc_perf.h and sc_perf.c to your project.

Usage


#include "sc_perf.h"  

int main(int argc, char *argv[])
{
    sc_perf_start();

    long_running_operation();

    sc_perf_end();
  
    return 0;
}

Output will be like

| Event                     | Value              | Measurement time  
---------------------------------------------------------------
| time (seconds)            | 0.66               | (100,00%)  
| cpu-clock                 | 654075766.00       | (100.00%)  
| task-clock                | 654077198.00       | (100.00%)  
| page-faults               | 3.00               | (100.00%)  
| context-switches          | 46.00              | (100.00%)  
| cpu-migrations            | 0.00               | (100.00%)  
| page-fault-minor          | 3.00               | (100.00%)  
| cpu-cycles                | 2656529748.00      | (100.00%)  
| instructions              | 7589235720.00      | (100.00%)  
| cache-misses              | 28715.00           | (100.00%)  
| L1D-read-miss             | 34124.00           | (100.00%)  
| L1I-read-miss             | 121958.00          | (100.00%)

Pause example


#include "sc_perf.h"

int main(int argc, char *argv[])
{
    sc_perf_start();

    long_running_operation();

    //Will stop counters.
    sc_perf_pause();
    operation_you_dont_want_to_measure();

    //Start counters again.
    sc_perf_start();
    another_long_running_operation();

    sc_perf_end();
    
    sc_perf_start();
    some_other_long_running_operation();
    sc_perf_end();
  
    return 0;
}