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annotate c/read_lseek/main.cc @ 99:1e5b56e8263b impl-bitvector

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remove some variable
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Tue, 10 Nov 2015 20:57:59 +0900
parents 57b2c00b9dc6
children
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <fcntl.h>
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5 #include <string.h>
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6 #include <stdbool.h>
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7 #include <sys/stat.h>
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8 #include <sys/time.h>
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9 #include <sys/types.h>
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10 #include "read.h"
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11
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12 static double st_time;
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13 static double ed_time;
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14
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15 /*
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16 * -b : bulk read 一括read
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17 * -d : divide read 分割read (default)
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18 */
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19 const char *usr_help_str = "Usage : ./read_lseek [-file filename] [-b -d]";
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20 const int ONE_TASK_READ_SIZE = 4096 * 1;
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21 bool bulk_flag = true;
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22 bool divide_flag = false;
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23
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24 void result_printf(int,char *);
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25 void divide_read(int,char*,read_t);
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26 void bulk_read(int,char*,read_t);
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27
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28 static double
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29 get_time(){
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30 struct timeval tv;
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31 gettimeofday(&tv,NULL);
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32 return tv.tv_sec + (double)tv.tv_usec*1e-6;
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33 }
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34
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35 int main(int argc, char *argv[]){
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36
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37 struct stat sb;
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38 read_t r;
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39
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40 char *filename = 0;
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41 for (int i = 1; argv[i]; ++i) {
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42 if (strcmp(argv[i], "-file") == 0){
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43 filename = argv[i+1];
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44 }else if(strcmp(argv[i], "-b") == 0){
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45 bulk_flag = true;
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46 divide_flag = false;
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47 }else if(strcmp(argv[i], "-d") == 0){
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48 bulk_flag = false;
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49 divide_flag = true;
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50 }
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51 }
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52
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53 if (filename == 0){
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54 puts(usr_help_str);
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55 exit(1);
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56 }
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57
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58 st_time = get_time();
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59
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60 int fd = -1;
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61 if ((fd=open(filename,O_RDONLY,0666))==0){
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62 fprintf(stderr,"can't open %s\n",filename);
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63 }
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64
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65 if (fstat(fd,&sb)){
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66 fprintf(stderr,"can't open %s\n",filename);
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67 }
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68
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69 r.text_size = sb.st_size;
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70 char *text = (char *)malloc(sizeof(char)*r.text_size);
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71
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72 r.one_task_read_size = ONE_TASK_READ_SIZE;
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73
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74 r.task_num = r.text_size / r.one_task_read_size;
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75 r.task_num += ((r.text_size % r.one_task_read_size) != 0);
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76
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77 if(bulk_flag == true){
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78 bulk_read(fd,text,r);
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79 }else if(divide_flag == true){
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80 divide_read(fd,text,r);
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81 }
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82
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83 free(text);
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84 close(fd);
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85
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86 ed_time = get_time();
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87 printf("Time: %0.6f\n",ed_time-st_time);
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88
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89 return 0;
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90 }
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91
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92 /* lseekで読む場所を指定してあげないといけないと思ったが、
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93 * readで読み込むだけでも読み込む場所が変わってくれるらしい。
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94 */
3
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95 void divide_read(int _fd,char* _text,read_t _r){
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96 for(int i = 0; i < _r.task_num; i++){
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97 //lseek(_fd, i * _r.one_task_read_size,SEEK_SET);
3
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98 read(_fd,_text,_r.one_task_read_size);
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99 result_printf(i,_text);
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100 }
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101 puts("divide read");
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102 printf("text size :%lu\n",_r.text_size);
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103 printf("one task size:%d\n",_r.one_task_read_size);
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104 printf("task num :%d\n",_r.task_num);
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105 }
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106
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107 void bulk_read(int _fd,char* _text,read_t _r){
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108 int i = 0;
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109 read(_fd,_text,_r.text_size);
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110 result_printf(i,_text);
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111 puts("bulk read");
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112 printf("text size :%lu\n",_r.text_size);
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113 }
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114
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115 void result_printf(int _i,char *_text){
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116 //printf("-------%d--------\n",_i + 1);
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117 printf("[task No. %d]%s\n",_i,_text);
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118 //printf("-----------------\n\n");
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119 }