i'm analysing my code with gprof, and i get the following output:

```
   %   cumulative   self              self     total           
  time  seconds   seconds    calls  ms/call  ms/call  name    
 59.22      0.58     0.58       48    12.09    18.81  _GLOBAL__sub_I_inputHeight

```

inputHeight is a global variable. I have no idea what *GLOBAL*\_sub\_I\_inputHeight means, but it is called 48 times, and consumes 60% (0,6) of the exection time. 

Any ideas?