How to benchmark my system using multiple threads in c++? - c++

Question

I have simplified my code, and it compiles, but it doesn't do anything. It doesn't error out though either. I am trying to get 7 threads (on my 8-core processor) in this example to write to a variable to benchmark my system. I would like to do this with multiple threads to see if it's faster. It's based off other code that worked before I added multithreading. When I run, it just terminates. It should show progress each second of how many total iterations all the threads have done together. Some of the includes are there from other code I am working on.
I would like to also gracefully terminate all 7 threads when Ctrl-C is pressed. Help would be appreciated. Thanks!
//Compiled using: g++ ./test.cpp -lpthread -o ./test
#include <stdio.h>
#include <string>
#include <iostream>
#include <time.h>
#include <ctime>
#include <ratio>
#include <chrono>
#include <iomanip>
#include <locale.h>
#include <cstdlib>
#include <pthread.h>
using namespace std;
using namespace std::chrono;
const int NUM_THREADS = 7;
const std::string VALUE_TO_WRITE = "TEST";
unsigned long long int total_iterations = 0;
void * RunBenchmark(void * threadid);
class comma_numpunct: public std::numpunct < char > {
protected: virtual char do_thousands_sep() const {
return ',';
}
virtual std::string do_grouping() const {
return "\03";
}
};
void * RunBenchmark(void * threadid) {
unsigned long long int iterations = 0;
std::string benchmark;
int seconds = 0;
std::locale comma_locale(std::locale(), new comma_numpunct());
std::cout.imbue(comma_locale);
auto start = std::chrono::system_clock::now();
auto end = std::chrono::system_clock::now();
do {
start = std::chrono::system_clock::now();
while ((std::chrono::duration_cast < std::chrono::seconds > (end - start).count() != 1)) {
benchmark = VALUE_TO_WRITE;
iterations += 1;
}
total_iterations += iterations;
iterations = 0;
cout << "Total Iterations: " << std::setprecision(0) << std::fixed << total_iterations << "\r";
} while (1);
}
int main(int argc, char ** argv) {
unsigned long long int iterations = 0;
int tc, tn;
pthread_t threads[NUM_THREADS];
for (tn = 0; tn < NUM_THREADS; tn++) {
tc = pthread_create( & threads[tn], NULL, & RunBenchmark, NULL);
}
return 0;
}