I needed a way to see how long a block of code was taking to run in seconds and also CPU calculations. I used
rdtsc even though it isn’t perfect it does provide decent results. What do I mean by decent? Well running the program 10 times the CPU calculations where fairly similar.
* Profile.h -
* This program will do its best job to profile both time and cpu cycle for c++ software.
* Used to output CPU cycles and the amount of seconds it took for the part of code to run.
* This does not work on Windows! Only OS that support the rdtsc value.
* Copyright 2010 Dan Sheffner.
* You may use this work without restrictions, as long as this notice is included.
* The work is provided "as is" without warranty of any kind, neither express nor implied.
* More information can be found here: http://litl.info/
unsigned long long int rdtsc ( void )
unsigned a , d ;
__asm__ volatile ( "rdtsc" : "=a" ( a ), "=d" ( d ));
return (( unsigned long long ) a ) | ((( unsigned long long ) d ) << 32 );;
unsigned long long int value1 ;
unsigned long long int value2 ;
unsigned long long int value3 ;
time_t start , end ;
double dif ;
void startProfiler ();
void stopProfiler ();
void logInfo ();
void Profiler :: startProfiler ()
time ( & start );
value1 = rdtsc ();
void Profiler :: stopProfiler ()
value2 = rdtsc ();
time ( & end );
Profiler :: logInfo ();
void Profiler :: logInfo ()
value3 = value2 - value1 ;
dif = difftime ( end , start );
//Automatically formats the output nicely.
//Only works on Linux
cout . imbue ( std :: locale ( "" ));
cout << "CPU Calculation: " << value3 << endl ;
printf ( "Time took %.2lf seconds. \n " , dif );
#endif /* PROFILE_H_ */