/*
* this function calls the others and returns all the results in a struct
* containing all the data we are interested in, comparing the various times
*/
timeMeasurmentStructure measureTimes(unsigned int osm_iterations)
{
timeMeasurmentStructure allData;
if(gethostname(allData.machineName,HOST_NAME_MAX) == FAILURE)
{
allData.machineName[0] = END_OF_STR;
}
allData.numberOfIterations = (osm_iterations / LP_UNRLNG + (osm_iterations % LP_UNRLNG ? 1 : 0)) * LP_UNRLNG;
allData.functionTimeNanoSecond = osm_function_time(osm_iterations);
allData.instructionTimeNanoSecond = osm_operation_time(osm_iterations);
allData.trapTimeNanoSecond = osm_syscall_time(osm_iterations);
//check if any error occurred during time measurement, and if so, the ratio is '-1'
int funcRatio = FAILURE, trapRatio = FAILURE;
if(allData.instructionTimeNanoSecond != FAILURE)
{
if(allData.functionTimeNanoSecond != FAILURE)
{
funcRatio = allData.functionTimeNanoSecond / allData.instructionTimeNanoSecond;
}
if(allData.trapTimeNanoSecond != FAILURE)
{
trapRatio = allData.trapTimeNanoSecond / allData.instructionTimeNanoSecond;
}
}
allData.functionInstructionRatio = funcRatio;
allData.trapInstructionRatio = trapRatio;
return allData;
}
/* Time measurement function for all operations.
* returns a struct containing all the measures.
* on any calculation error the value will be -1.
* on any error in the machine name, the value will be NULL.
* The machineName field in the returned struct is dynamically allocated and
* it is the user responsibility to free the memory.
*/
timeMeasurmentStructure measureTimes (unsigned int operation_iterations,
unsigned int function_iterations,
unsigned int syscall_iterations,
unsigned int disk_iterations)
{
timeMeasurmentStructure measures;
measures.machineName = new char;
if(gethostname(measures.machineName, MAX_MACHINE_NAME_LEN) == -1) {
measures.machineName = NULL;
}
measures.instructionTimeNanoSecond =
osm_operation_time(operation_iterations);
measures.functionTimeNanoSecond = osm_function_time(function_iterations);
measures.trapTimeNanoSecond = osm_syscall_time(syscall_iterations);
measures.diskTimeNanoSecond = osm_disk_time(disk_iterations);
if (measures.instructionTimeNanoSecond == 0){
measures.functionInstructionRatio = -1;
measures.trapInstructionRatio = -1;
measures.diskInstructionRatio = -1;
}
else {
measures.functionInstructionRatio = measures.functionTimeNanoSecond /
measures.instructionTimeNanoSecond;
measures.trapInstructionRatio = measures.trapTimeNanoSecond /
measures.instructionTimeNanoSecond;
measures.diskInstructionRatio = measures.diskTimeNanoSecond /
measures.instructionTimeNanoSecond;
}
return measures;
};