fsync benchmark

fsync-bench.cpp

#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <thread>
#include <mutex>
#include <vector>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

double microtime() {
    struct timeval now;
    gettimeofday(&now, NULL);
    double ret = now.tv_sec + now.tv_usec / 1000.0 / 1000.0;
    return ret;
}

int main(int argc, char** argv) {
    if(argc < 2){
        printf("Usage: %s filename count\n", argv[0]);
        exit(1);
    }
    const char *filename = argv[1];
    int fd = open(filename, O_CREAT | O_WRONLY | O_APPEND, 0644);
    if(fd == -1){
        printf("%d error: %s\n", __LINE__, strerror(errno));
        exit(1);
    }

    int SIZE = 1000;
    if(argc > 2){
        SIZE = atoi(argv[2]);
    }

    double stime = microtime();
    for(int i=0; i<SIZE; i++){
        int ret;
        ret = write(fd, "1234567890\n", 11);
        if(ret == -1){
            printf("%d error: %s\n", __LINE__, strerror(errno));
            exit(1);
        }
        ret = fsync(fd);
        if(ret == -1){
            printf("%d error: %s\n", __LINE__, strerror(errno));
            exit(1);
        }
    }
    double etime = microtime();
    printf("time: %.3fs, qps: %.0f\n", (etime - stime), SIZE / (etime - stime));

    return 0;
}