time.cpp

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/** @file time.cpp
 *
 *  @author Cory Alexander Balaton (coryab)
 *  @author Janita Ovidie Sandtrøen Willumsen (janitaws)
 *
 *  @version 0.1
 *
 *  @brief Timing various things.
 *
 *  @bug No known bugs
 * */
#include "data_type.hpp"
#include "monte_carlo.hpp"
#include "utils.hpp"
 
#include <getopt.h>
#include <omp.h>
#include <ostream>
 
/** @brief Time phase transition using different lattice sizes.
 * */
void time_lattice_sizes()
{
    std::string outfile = "data/hp/timing/lattice_sizes.txt";
    std::ofstream ofile;
 
    int lattice_sizes[] = {20, 40, 60, 80, 100};
 
    utils::mkpath(utils::dirname(outfile));
    ofile.open(outfile);
    double t0, t1, t2;
    for (int L : lattice_sizes) {
        t0 = omp_get_wtime();
        montecarlo::phase_transition(L, 2.1, 2.4, 40, 20000,
                                     montecarlo::mcmc_parallel, "/dev/null", 0);
        t1 = omp_get_wtime();
        montecarlo::phase_transition(L, 2.1, 2.4, 40, 20000,
                                     montecarlo::mcmc_serial, "/dev/null", 0);
        t2 = omp_get_wtime();
        ofile << utils::scientific_format(L) << ','
              << utils::scientific_format(t1 - t0) << ','
              << utils::scientific_format(t2 - t1) << '\n';
    }
    ofile.close();
}
 
/** @brief Time phase transition using different sample sizes.
 * */
void time_sample_sizes()
{
    std::string outfile = "data/hp/timing/sample_sizes.txt";
    std::ofstream ofile;
 
    int sample_sizes[] = {1000, 10000, 100000};
 
    utils::mkpath(utils::dirname(outfile));
    ofile.open(outfile);
    double t0, t1, t2;
    for (int samples : sample_sizes) {
        t0 = omp_get_wtime();
        montecarlo::phase_transition(20, 2.1, 2.4, 40, samples,
                                     montecarlo::mcmc_parallel, "/dev/null", 0);
        t1 = omp_get_wtime();
        montecarlo::phase_transition(20, 2.1, 2.4, 40, samples,
                                     montecarlo::mcmc_serial, "/dev/null", 0);
        t2 = omp_get_wtime();
        ofile << utils::scientific_format(samples) << ','
              << utils::scientific_format(t1 - t0) << ','
              << utils::scientific_format(t2 - t1) << '\n';
    }
    ofile.close();
}
 
/** @brief A function that displays how to use the program and quits.*/
void usage(std::string filename)
{
    std::cout << "Usage: " << filename << " OPTION ...\n"
              << "At least one option should be used.\n\n"
              << "\t[ -h | --help ]\n"
              << "\t[ --all ]\n"
              << "\t[ --time-lattice-sizes ]\n"
              << "\t[ --time-sample-sizes ]\n";
    exit(-1);
}
 
/** @brief The main function.*/
int main(int argc, char **argv)
{
    struct option long_options[] = {{"all", 0, 0, 0},
                                    {"time-lattice-sizes", 0, 0, 0},
                                    {"time-sample-sizes", 0, 0, 0},
                                    {"help", 0, 0, 0},
                                    {NULL, 0, NULL, 0}};
 
    int option_index = -1;
    int c;
 
    while (true) {
        c = getopt_long(argc, argv, "h", long_options, &option_index);
 
        if (c == -1)
            break;
 
        switch (c) {
        case 0:
            switch (option_index) {
            case 0:
                time_lattice_sizes();
                time_sample_sizes();
                break;
            case 1:
                time_lattice_sizes();
                break;
            case 2:
                time_sample_sizes();
                break;
            case 3: // Not a mistake. This just goes to the default.
            default:
                usage(argv[0]);
            }
            break;
        case 'h':
        default:
            usage(argv[0]);
        }
    }
 
    return 0;
}