source: benchmark/readyQ/yield.cfa @ 160ee4c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>

extern "C" {
        #include <locale.h>
        #include <getopt.h>
}

#include <unistd.h>

#include <clock.hfa>
#include <time.hfa>
#include <stats.hfa>

#include "../benchcltr.hfa"

extern bool traceHeapOn();


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

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

void main( Yielder & this ) {
        park();
        /* paranoid */ assert( true == __atomic_load_n(&run, __ATOMIC_RELAXED) );

        while(__atomic_load_n(&run, __ATOMIC_RELAXED)) {
                yield();
                this.counter++;
        }
        __atomic_fetch_add(&global_counter, this.counter, __ATOMIC_SEQ_CST);
}

int main(int argc, char * argv[]) {
        unsigned num_io = 1;
        io_context_params params;

        cfa_option opt[] = {
                BENCH_OPT_CFA
        };
        int opt_cnt = sizeof(opt) / sizeof(cfa_option);

        char **left;
        parse_args( argc, argv, opt, opt_cnt, "[OPTIONS]...\ncforall yield benchmark", left );

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

                Time start, end;
                BenchCluster cl = { num_io, params, CFA_STATS_READY_Q };
                {
                        BenchProc procs[nprocs];
                        {
                                Yielder threads[nthreads];
                                printf("Starting\n");

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

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

                                run = false;
                                end = timeHiRes();
                                printf("\nDone\n");
                        }
                }

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