用c++做性能测试

时间：

timeval start_time,end_time;
gettimeofday(&start_time,NULL);

gettimeofday(&end_time,NULL);
cout<< "time(s) : " << end_time.tv_sec-start_time.tv_sec + (end_time.tv_usec-start_time.tv_usec)/1000000.0 <<endl;

linux内存（当前进程虚拟内存）：

//for checking memory
int parseLine(char* line){
    // This assumes that a digit will be found and the line ends in " Kb".
    int i = strlen(line);
    const char* p = line;
    while (*p <'0' || *p > '9') p++;
    line[i-3] = 0;
    i = atoi(p);
    return i;
}

int getMemkb(){ //Note: this value is in KB!
    FILE* file = fopen("/proc/self/status", "r");
    int result = -1;
    char line[128];

    while (fgets(line, 128, file) != NULL){
        if (strncmp(line, "VmSize:", 7) == 0){
            result = parseLine(line);
            break;
        }
    }
    fclose(file);
    return result;
}