Changes

GPU621/NoName

16 bytes added, 11:29, 24 November 2016

→‎SPMD

An example of the SPMD programming model in STD Threads using an atomic barrier

#include <iostream> #include <iomanip> #include <cstdlib> #include <chrono> #include <vector> #include <thread> #include <atomic> using namespace std::chrono;

std::atomic<double> pi;

void reportTime(const char* msg, steady_clock::duration span) {

auto ms = duration_cast<milliseconds>(span);

std::cout << msg << " - took - " <<

ms.count() << " milliseconds" << std::endl;

} void run(int ID, double stepSize, int nthrds, int n) {

double x;

double sum = 0.0;

sum = sum * stepSize;

pi = pi + sum;

}

int main(int argc, char** argv) {

if (argc != 3) {

std::cerr << argv[0] << ": invalid number of arguments\n";

std::cout << "Press Enter key to exit ... ";

std::cin.get(c);

}

====Question & Awnser====

Sstoor3

23

edits

CDOT Wiki β

Changes

GPU621/NoName

CDOT Wiki ^β