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main.cpp
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main.cpp
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <libaio.h>
#include "aio.h"
#define PIECE_LEN (256*1024)
#define AIO_MAXIO 64
int read_sequence(char* file_name)
{
int ret = 0;
int fd = -1;
fd = ::open(file_name, O_RDONLY);
fprintf(stdout, "open %s, fd %d\n", file_name, fd);
u_int8_t data[PIECE_LEN];
while(1)
{
ret = read(fd, data, PIECE_LEN);
if(ret < PIECE_LEN)
{
break;
}
}
fprintf(stdout, "close fd %d\n", fd);
::close(fd);
fd = -1;
return 0;
}
long rand_index(long radix)
{
if(radix == 0)
{
return 0;
}
long rand_val = random();
long ret_val = rand_val%radix;
return ret_val;
}
int bitfield_find_unset(u_int8_t* bits, int piece_num, int start_index)
{
int pos = 0;
int index = 0;
for(index=0; index<piece_num; index++)
{
pos = index+start_index;
if(pos>=piece_num)
{
pos = pos%piece_num;
}
int byte_pos = pos/8;
int bit_pos = pos%8;
int bit_pos2 = 7 - bit_pos;
if(!(bits[byte_pos] & (1<<bit_pos2)))
{
// find it
return pos;
}
}
return -1;
}
int bitfield_set_one(u_int8_t* bits, int piece_num, int index)
{
int byte_pos = index/8;
int bit_pos = index%8;
int bit_pos2 = 7 - bit_pos;
bits[byte_pos] = bits[byte_pos] | (1<<bit_pos2);
return 0;
}
int read_random(char* file_name)
{
int ret = 0;
int fd = -1;
fd = ::open(file_name, O_RDONLY);
fprintf(stdout, "open %s, fd %d\n", file_name, fd);
int64_t file_length = ::lseek(fd, 0, SEEK_END);
int piece_num = (file_length + PIECE_LEN - 1)/ PIECE_LEN;
int bitfield_size = (piece_num + 8 - 1)/8;
u_int8_t* bitfield = (u_int8_t*)malloc(bitfield_size);
memset(bitfield, 0, bitfield_size);
fprintf(stdout, "file_length=%ld, piece_num=%d, bitfield_size=%d\n", file_length, piece_num, bitfield_size);
u_int8_t data[PIECE_LEN];
while(1)
{
// read piece by random
int piece_index = rand_index(piece_num);
int piece_pos = bitfield_find_unset(bitfield, piece_num, piece_index);
if(piece_pos == -1)
{
break;
}
//fprintf(stdout, "piece_pos=%d\n", piece_pos);
lseek(fd, PIECE_LEN*piece_pos, SEEK_SET);
read(fd, data, PIECE_LEN);
bitfield_set_one(bitfield, piece_num, piece_pos);
}
close(fd);
fd = -1;
return 0;
}
int pread_random(char* file_name)
{
int ret = 0;
int fd = -1;
fd = ::open(file_name, O_RDONLY);
fprintf(stdout, "open %s, fd %d\n", file_name, fd);
int64_t file_length = ::lseek(fd, 0, SEEK_END);
int piece_num = (file_length + PIECE_LEN - 1)/ PIECE_LEN;
int bitfield_size = (piece_num + 8 - 1)/8;
u_int8_t* bitfield = (u_int8_t*)malloc(bitfield_size);
memset(bitfield, 0, bitfield_size);
fprintf(stdout, "file_length=%ld, piece_num=%d, bitfield_size=%d\n", file_length, piece_num, bitfield_size);
u_int8_t data[PIECE_LEN];
while(1)
{
// read piece by random
int piece_index = rand_index(piece_num);
int piece_pos = bitfield_find_unset(bitfield, piece_num, piece_index);
if(piece_pos == -1)
{
break;
}
//fprintf(stdout, "piece_pos=%d\n", piece_pos);
pread(fd, data, PIECE_LEN, PIECE_LEN*piece_pos);
bitfield_set_one(bitfield, piece_num, piece_pos);
}
close(fd);
fd = -1;
return 0;
}
int aio_read_random(char* file_name)
{
int ret = 0;
int fd = -1;
fd = ::open(file_name, O_RDONLY);
fprintf(stdout, "open %s, fd %d\n", file_name, fd);
int64_t file_length = ::lseek(fd, 0, SEEK_END);
int piece_num = (file_length + PIECE_LEN - 1)/ PIECE_LEN;
int bitfield_size = (piece_num + 8 - 1)/8;
u_int8_t* bitfield = (u_int8_t*)malloc(bitfield_size);
memset(bitfield, 0, bitfield_size);
fprintf(stdout, "file_length=%ld, piece_num=%d, bitfield_size=%d\n", file_length, piece_num, bitfield_size);
io_context_t myctx;
memset(&myctx, 0, sizeof(myctx));
io_queue_init(AIO_MAXIO, &myctx);
while(1)
{
// read piece by random
int piece_index = rand_index(piece_num);
int piece_pos = bitfield_find_unset(bitfield, piece_num, piece_index);
if(piece_pos == -1)
{
break;
}
//printf("read piece=%d\n", piece_pos);
struct iocb* io2 = (struct iocb*)malloc(sizeof(struct iocb));
memset(io2, 0, sizeof(struct iocb));
u_int8_t* buff = NULL;
posix_memalign((void **)&buff, getpagesize(), PIECE_LEN);
io_prep_pread(io2, fd, buff, PIECE_LEN, PIECE_LEN*piece_pos);
io2->data = (void*)piece_pos;
io_submit(myctx, 1, &io2);
struct io_event events[AIO_MAXIO];
int num = io_getevents(myctx, 0, AIO_MAXIO, events, NULL);
//printf("io_request completed %d\n", num);
for(int i=0;i<num;i++)
{
struct iocb *objp = events[i].obj;
int finish_piece_pos = (int)(long)objp->data;
//printf("done_piece=%d, res=%ld, res2=%ld\n", finish_piece_pos, events[i].res, events[i].res2);
//cb(myctx, io2, events[i].res, events[i].res2);
bitfield_set_one(bitfield, piece_num, finish_piece_pos);
free(objp->u.c.buf);
free(objp);
}
}
close(fd);
fd = -1;
return 0;
}
int test_case1()
{
char* file_names[] =
{
"/home/guoqiang/code/0.0.2/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/html/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/html/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/html/B421F1690EDF4115D39A0531770FF1D46B57F9FC.dat",
};
int index = 0;
for(index=0; index<(int)(sizeof(file_names)/sizeof(file_names[0])); index++)
{
read_sequence(file_names[index]);
}
return 0;
}
int test_case2()
{
char* file_names[] =
{
"/home/guoqiang/code/0.0.2/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/html/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/html/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/html/B421F1690EDF4115D39A0531770FF1D46B57F9FC.dat",
};
int index = 0;
for(index=0; index<(int)(sizeof(file_names)/sizeof(file_names[0])); index++)
{
read_random(file_names[index]);
}
return 0;
}
int test_case3()
{
char* file_names[] =
{
"/home/guoqiang/code/0.0.2/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/html/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/html/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/html/B421F1690EDF4115D39A0531770FF1D46B57F9FC.dat",
};
int index = 0;
for(index=0; index<(int)(sizeof(file_names)/sizeof(file_names[0])); index++)
{
pread_random(file_names[index]);
}
return 0;
}
int test_case4()
{
char* file_names[] =
{
"/home/guoqiang/code/0.0.2/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/new_ms1/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/guoqiang/code/NewMediaServer/xiongm/MediaSvr/14C39AB98D3205AC196308FAA27B3485BCB7109C.dat",
"/home/html/02A805D023585316849992F61018FD8A360239D6.dat",
"/home/html/C102015F1FD646DC1534F8244C4C4A6A2AF0C425.dat",
"/home/html/B421F1690EDF4115D39A0531770FF1D46B57F9FC.dat",
};
int index = 0;
for(index=0; index<(int)(sizeof(file_names)/sizeof(file_names[0])); index++)
{
aio_read_random(file_names[index]);
}
return 0;
}
int main(int argc, char* argv[])
{
int ret = 0;
//test_case1();
//test_case2();
test_case3();
//test_aio("abc.txt", "def.txt");
//test_case4();
return ret;
}