Listing 2. C++ Benchmark Source Code
#include
#include
#include
const int NOBJECTS = 500000;
class PerfTest
{
public:
PerfTest ();
void addAmount (int val);
int getAmount ();
private:
int amount;
};
PerfTest::PerfTest ()
{
amount = 0;
}
void PerfTest::addAmount (int val)
{
amount += val;
}
int PerfTest::getAmount ()
{
return amount;
}
void reportResult (struct timeval* tstart, struct timeval* tend);
/*
* C++ version of the test driver.
* Creates half a million simple account objects, adds an amount
* to each one, and then adds up the amounts in all accounts.
* Reports elapsed time in milliseconds and number of objects
* processed per millisecond.
*/
void main (int argc, char** argv)
{
PerfTest* ptarr[NOBJECTS];
struct timeval tval_start;
struct timeval tval_end;
struct timezone tzone;
int sum = 0;
int i = 0;
gettimeofday (&tval_start, &tzone);
for (i = 0; i < NOBJECTS; i++)
ptarr[i] = new PerfTest;
for (i = 0; i < NOBJECTS; i++)
ptarr[i]->addAmount(i);
for (i = 0; i < NOBJECTS; i++)
sum += ptarr[i]->getAmount();
gettimeofday (&tval_end, &tzone);
reportResult (&tval_start, &tval_end);
}
/*
* Helper function to report results.
*/
void reportResult (struct timeval* tstart, struct timeval* tend)
{
int start_ms = (tstart->tv_sec * 1000) +
(tstart->tv_usec / 1000);
int end_ms = (tend->tv_sec * 1000) +
(tend->tv_usec / 1000);
cout << "Elapsed time in milliseconds for "
<< NOBJECTS << " objects: " <<
(end_ms - start_ms) << "\n";
cout << "Objects per millisecond: " <<
(NOBJECTS / (end_ms - start_ms)) << "\n";
}
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