source: benchmark/readyQ/yield.cpp @ 86b8d16

#include "rq_bench.hpp"
#include <libfibre/fibre.h>

volatile bool run = false;
volatile unsigned long long global_counter;


void fibre_main() {
        fibre_park();
        unsigned long long count = 0;
        for(;;) {
                Fibre::forceYield();
                count++;
                if( clock_mode && stop) break;
                if(!clock_mode && count >= stop_count) break;
        }

        __atomic_fetch_add(&global_counter, count, __ATOMIC_SEQ_CST);
        __atomic_fetch_add(&threads_left, -1, __ATOMIC_SEQ_CST);
}

int main(int argc, char * argv[]) {
        option_t opt[] = {
                BENCH_OPT
        };
        BENCH_OPT_PARSE("libfibre yield benchmark");

        {
                printf("Running %d threads on %d processors for %lf seconds\n", nthreads, nprocs, duration);

                FibreInit(1, nprocs);
                uint64_t start, end;
                {
                        threads_left = nthreads;
                        Fibre * threads[nthreads];
                        for(unsigned i = 0; i < nthreads; i++) {
                                threads[i] = new Fibre( reinterpret_cast<void (*)(void *)>(fibre_main), nullptr );
                        }
                        printf("Starting\n");
                        bool is_tty = isatty(STDOUT_FILENO);
                        start = timeHiRes();

                        for(unsigned i = 0; i < nthreads; i++ ) {
                                fibre_unpark( threads[i] );
                        }
                        wait<Fibre>(start, is_tty);

                        stop = true;
                        end = timeHiRes();
                        for(unsigned i = 0; i < nthreads; i++ ) {
                                fibre_join( threads[i], nullptr );
                        }
                }

                printf("Duration (ms)        : %'ld\n", to_miliseconds(end - start));
                printf("Number of processors : %'d\n", nprocs);
                printf("Number of threads    : %'d\n", nthreads);
                printf("Total Operations(ops): %'15llu\n", global_counter);
                printf("Ops per second       : %'18.2lf\n", ((double)global_counter) / to_fseconds(end - start));
                printf("ns per ops           : %'18.2lf\n", ((double)(end - start)) / global_counter);
                printf("Ops per threads      : %'15llu\n", global_counter / nthreads);
                printf("Ops per procs        : %'15llu\n", global_counter / nprocs);
                printf("Ops/sec/procs        : %'18.2lf\n", (((double)global_counter) / nprocs) / to_fseconds(end - start));
                printf("ns per ops/procs     : %'18.2lf\n", ((double)(end - start)) / (global_counter / nprocs));
                fflush(stdout);
        }
}