source: benchmark/readyQ/yield.cfa @ 04b5cef

#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 "../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[]) {
        double duration = 5;
        int nprocs = 1;
        int nthreads = 1;



        for(;;) {
                static struct option options[] = {
                        {"duration",  required_argument, 0, 'd'},
                        {"nprocs",    required_argument, 0, 'p'},
                        {"nthreads",  required_argument, 0, 't'},
                        {0, 0, 0, 0}
                };

                int idx = 0;
                int opt = getopt_long(argc, argv, "d:p:t:", options, &idx);

                char * arg = optarg ? optarg : "";
                size_t len = 0;
                char * end;
                switch(opt) {
                        case -1:
                                goto run;
                        // Numeric Arguments
                        case 'd':
                                duration = strtod(arg, &end);
                                if(*end != '\0') {
                                        fprintf(stderr, "Duration must be a valid double, was %s\n", arg);
                                        goto usage;
                                }
                                break;
                        case 't':
                                nthreads = strtoul(arg, &end, 10);
                                if(*end != '\0' || nthreads < 1) {
                                        fprintf(stderr, "Number of threads must be a positive integer, was %s\n", arg);
                                        goto usage;
                                }
                                break;
                        case 'p':
                                nprocs = strtoul(arg, &end, 10);
                                if(*end != '\0' || nprocs < 1) {
                                        fprintf(stderr, "Number of processors must be a positive integer, was %s\n", arg);
                                        goto usage;
                                }
                                break;
                        // Other cases
                        default: /* ? */
                                fprintf( stderr, "Unkown option '%c'\n", opt);
                        usage:
                                fprintf( stderr, "Usage: %s [options]\n", argv[0]);
                                fprintf( stderr, "\n" );
                                fprintf( stderr, "  -d, --duration=DURATION  Duration of the experiment, in seconds\n" );
                                fprintf( stderr, "  -t, --nthreads=NTHREADS  Number of kernel threads\n" );
                                fprintf( stderr, "  -q, --nqueues=NQUEUES    Number of queues per threads\n" );
                                exit(1);
                }
        }
        run:

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

                Time start, end;
                BenchCluster cl;
                #if !defined(__CFA_NO_STATISTICS__)
                        print_stats_at_exit( cl.self );
                #endif
                {
                        BenchProc procs[nprocs];
                        {
                                Yielder threads[nthreads];
                                bool is_tty = isatty(STDOUT_FILENO);
                                printf("Starting\n");
                                start = getTime();
                                run = true;

                                for(i; nthreads) {
                                        unpark( threads[i] __cfaabi_dbg_ctx2 );
                                }
                                for() {
                                        sleep(500`ms);
                                        end = getTime();
                                        if( (end - start) >= duration`s ) {
                                                break;
                                        }
                                        if(is_tty) {
                                                printf("\r%.4lf", (double)(end - start)`s);
                                                fflush(stdout);
                                        }
                                }

                                run = false;
                                end = getTime();
                                printf("Done\n");
                        }
                }

                printf("Took %'ld ms\n", (end - start)`ms);
                printf("Total yields        : %'15llu\n", global_counter);
                printf("Yields per procs    : %'15llu\n", global_counter / nprocs);
                printf("Yields per second   : %'18.2lf\n", ((double)global_counter) / (end - start)`s);
                printf("Yields/sec/procs    : %'18.2lf\n", (((double)global_counter) / nprocs) / (end - start)`s);
                printf("ns per yields       : %'18.2lf\n", ((double)(end - start)`ns) / global_counter);
                printf("ns per yields/procs : %'18.2lf\n", ((double)(end - start)`ns) / (global_counter / nprocs));

        }
}