cpp-profiler's Introduction

Simple manual cpp profiler

Procs:

Single header
Profile only what you need
Profiling arbitrary scope
Early profiling scope ending

Cons:

Overhead ~300ns per call
You need to explicitely mark what you want to profile
May break in multithreaded environments
Combines calls to the same function from different contexts, e.g. if foo() -> baz(), bar() -> baz() then baz() will be shown only after foo()
Complex recursion (e.g. rec1 calls rec2 and rec2 calls rec1) may lead to incorrect total time for both rec1 and rec2.

Demo output

[bar] Sleeping for 99978us twice

function                                                    line	calls	   tottime	avgtime

int main().................................................. 57       1            1.34s      1.34s 
 foo for loop............................................... 60       1          905.03ms   905.03ms
  double foo(int)........................................... 10       10         905.02ms    90.50ms
   nop...................................................... 17       1000000    277.58ms   277.58ns
 bar wait................................................... 66       1          200.21ms   200.21ms
  double bar(int)........................................... 23       1          100.13ms   100.13ms
 fibb....................................................... 71       1          208.41ms   208.41ms
  int fibb(int)............................................. 31       177        207.51ms     1.17ms
 rec1 + rec2................................................ 76       1           30.17ms    30.17ms
  int rec1(int)............................................. 41       89          29.87ms   335.61us
   int rec2(int)............................................ 49       88          28.18ms   320.28us

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