Simple c++ wrapper for PAPI perf counter

The library can be used as a C++ tool, which requires to add the library as a build dependency. The other possibility is to use it as an LD_PRELOAD library or with libmonitor[1].

Example usage

int main(int argc, char **argv) {
Papi papi;
auto instance = papi.create();
instance->addEvent(PAPI_TOT_INS);
instance->start();
/** Some workload */
instance->stop();
std::cout << "total instructions " << instance->getEventValue(PAPI_TOT_INS) << std::endl;
return 0;
}

Not thread safe

In its current state the library is not thread safe. Thread support may be added in the future.

[1]https://github.com/HPCToolkit/libmonitor