source: benchmark/readyQ/yield.cfa @ 90a8125

#include "rq_bench.hfa"

thread __attribute__((aligned(128))) Yielder {
        unsigned long long count;
};
void ?{}( Yielder & this ) {
        ((thread&)this){ "Yielder Thread", bench_cluster };
        this.count = 0;
}

void main( Yielder & this ) {
        park();
        for() {
                yield();
                this.count++;
                if( clock_mode && stop) break;
                if(!clock_mode && this.count >= stop_count) break;
        }

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

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

        {
                unsigned long long global_counter = 0;

                Time start, end;
                BenchCluster bc = { nprocs };
                {
                        threads_left = nthreads;
                        Yielder threads[nthreads];
                        printf("Starting\n");

                        bool is_tty = isatty(STDOUT_FILENO);
                        start = timeHiRes();

                        for(i; nthreads) {
                                unpark( threads[i] );
                        }
                        wait(start, is_tty);

                        stop = true;
                        end = timeHiRes();
                        printf("\nDone\n");

                        for(i; nthreads) {
                                Yielder & y = join( threads[i] );
                                global_counter += y.count;
                        }
                }

                printf("Duration (ms)        : %'ld\n", (end - start)`dms);
                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) / (end - start)`s);
                printf("ns per ops           : %'18.2lf\n", (end - start)`dns / 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) / (end - start)`s);
                printf("ns per ops/procs     : %'18.2lf\n", (end - start)`dns / (global_counter / nprocs));
                fflush(stdout);
        }
}