source: benchmark/readyQ/yield.cfa @ dcf1979

#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( __cfaabi_dbg_ctx );
        /* 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[]) {
        BENCH_DECL

        for(;;) {
                static struct option options[] = {
                        BENCH_OPT_LONG
                        {0, 0, 0, 0}
                };

                int idx = 0;
                int opt = getopt_long(argc, argv, BENCH_OPT_SHORT, options, &idx);

                const char * arg = optarg ? optarg : "";
                char * end;
                switch(opt) {
                        case -1:
                                goto run;
                        BENCH_OPT_CASE
                        default: /* ? */
                                fprintf( stderr, "Unkown option '%c'\n", opt);
                        usage:
                                bench_usage( argv );
                                exit(1);
                }
        }
        run:

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

                Time start, end;
                BenchCluster cl = { 0, CFA_STATS_READY_Q };
                {
                        BenchProc procs[nprocs];
                        {
                                Yielder threads[nthreads];
                                printf("Starting\n");

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

                                for(i; nthreads) {
                                        unpark( threads[i] __cfaabi_dbg_ctx2 );
                                }
                                wait(duration, start, end, is_tty);

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

                printf("Took %'ld ms\n", (end - start)`ms);
                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("Total yields        : %'15llu\n", 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);
        }
}