// The program just illustrates the memory usage.
// It creates an array of doubles of size 100 millions,
// fills it with arbitrary numbers, and calculates
// its sum in the infinite loop. Several such processes
// running simultaneously exaust the physical memory
// of computer and initiate swapping.
//
// To start the process, execute the command line
//     ./memtst ProcessName

#include <stdio.h>

int main(int argc, char *argv[]) {
    printf("Number of command line arguments: %d\n", argc);
    for (int i = 0; i < argc; ++i) {
        printf("arg %d: %s\n", i, argv[i]);
    }
    const char *processName = "noname";
    if (argc > 1)
        processName = argv[1];

    int n = 100000000; // 100 millions
    double* a = new double[n];

    for (int i = 0; i < n; ++i)
        a[i] = (double) i;

    while (true) {
        double sum = 0.;
        for (int i = 0; i < n; ++i)
            sum += a[i];    
        printf("Process %s: sum = %lf\n", processName, sum);
    }

    return 0;
}