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mpi_parallel.c
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mpi_parallel.c
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#include <dirent.h>
#include <errno.h>
#include <mpi.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <omp.h>
#include "util/hashTable.h"
#include "util/queue.h"
#include "util/util.h"
#define TAG_COMM_REQ_DATA 0
#define TAG_COMM_FILE_NAME 1
#define TAG_COMM_PAIR_LIST 3
#define WORD_MAX_LENGTH 50
#define HASH_CAPACITY 50000
#define REPEAT_FILES 10
#define BREAK_RM 0
extern int errno;
int DEBUG_MODE = 0;
int PRINT_MODE = 1;
typedef struct
{
int hash;
int count;
char word[WORD_MAX_LENGTH];
} pair;
int args_parse(int argc, char **argv, char *files_dir, int *repeat_files)
{
// https://stackoverflow.com/questions/17877368/getopt-passing-string-parameter-for-argument
int opt;
while ((opt = getopt(argc, argv, "d:r:g")) != -1)
{
switch (opt)
{
case 'd':
strcpy(files_dir, optarg);
break;
case 'r':
*repeat_files = (int)atol(optarg);
break;
case ':':
fprintf(stderr, "Option -%c requires an argument to be given\n", optopt);
return -1;
}
}
return 0;
}
int main(int argc, char **argv)
{
MPI_Init(&argc, &argv);
int size, pid, p_name_len;
char p_name[MPI_MAX_PROCESSOR_NAME];
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &pid);
MPI_Get_processor_name(p_name, &p_name_len);
double global_time = 0;
double local_time = 0;
char csv_out[400] = "";
char tmp_out[200] = "";
char files_dir[] = "./files"; // TODO: This should be taken from argv
int repeat_files = REPEAT_FILES;
int arg_parse = args_parse(argc, argv, files_dir, &repeat_files);
local_time = -omp_get_wtime();
FILE *outfile;
// open a file whose name is based on the pid
char buf[16];
// TODO: Create output directories automatically and not hard coded
snprintf(buf, 16, "./pout/f%03d.txt", pid);
outfile = fopen(buf, "w");
// outfile = stdout;
MPI_Request request;
MPI_Status status;
int recv_pid;
int recv_len = 0;
int count = 0;
int done = 0;
int file_count = 0;
int done_sent_p_count = 0;
struct Queue *file_name_queue;
struct Queue *files_to_read;
MPI_Barrier(MPI_COMM_WORLD);
char *file_names = (char *)malloc(sizeof(char) * FILE_NAME_BUF_SIZE * 1000);
if (pid == 0)
{
file_name_queue = createQueue();
for (int i = 0; i < repeat_files; i++)
{
int files = get_file_list(file_name_queue, files_dir);
if (files == -1)
{
printf("Check input directory and rerun! Exiting!\n");
return 1;
}
file_count += files;
}
int num_files_to_send = file_count / size;
int spare = file_count % size;
// iterate for all process ids in the comm world
for (int i = 0; i < size; i++)
{
char *concat_files =
(char *)malloc(sizeof(char) * FILE_NAME_BUF_SIZE * num_files_to_send);
int len = 0;
int send_file_count = num_files_to_send;
if (spare>0) {
send_file_count += 1;
spare--;
}
// concat file names to one big char array for ease of sending
for (int j = 0; j < send_file_count; j++)
{
if (j == 0)
{
strcpy(concat_files, file_name_queue->front->line);
}
else
{
strcat(concat_files, file_name_queue->front->line);
}
len += file_name_queue->front->len + 1;
if (j != send_file_count - 1)
{
strcat(concat_files, ",");
}
deQueue(file_name_queue);
}
if (i == 0)
{ // send to other processes
strcpy(file_names, concat_files);
recv_len = len;
}
else
{
MPI_Send(concat_files, len + 1, MPI_CHAR, i, TAG_COMM_FILE_NAME,
MPI_COMM_WORLD);
}
}
}
else
{
MPI_Status status;
MPI_Recv(file_names, FILE_NAME_BUF_SIZE * 1000, MPI_CHAR, 0,
TAG_COMM_FILE_NAME, MPI_COMM_WORLD, &status);
MPI_Get_count(&status, MPI_CHAR, &recv_len);
}
// fprintf(outfile, "received file name [%s] to pid %d from process 0, recv len %d\n", file_names, pid, recv_len);
MPI_Barrier(MPI_COMM_WORLD);
local_time += omp_get_wtime();
global_time += local_time;
sprintf(tmp_out, "%d, %d, %d, %.4f, ", file_count, HASH_CAPACITY, size, local_time);
strcat(csv_out, tmp_out);
// this indicates the end of reading section of the MPI
struct Queue *queue = createQueue();
struct hashtable *hash_table = createtable(HASH_CAPACITY);
// this can be run with multiple threads -- can be changed later
char *file;
if (BREAK_RM) {
local_time = -omp_get_wtime();
while ((file = strtok_r(file_names, ",", &file_names)))
{
if (strlen(file) > 0)
{
queue->finished = 0;
populateQueue(queue, file); // read file
queue->finished = 1;
}
}
MPI_Barrier(MPI_COMM_WORLD);
local_time += omp_get_wtime();
global_time += local_time;
sprintf(tmp_out, "%.4f, ", local_time);
strcat(csv_out, tmp_out);
local_time = -omp_get_wtime();
populateHashMap(queue, hash_table); // map file
MPI_Barrier(MPI_COMM_WORLD);
local_time += omp_get_wtime();
global_time += local_time;
sprintf(tmp_out, "%.4f, ", local_time);
strcat(csv_out, tmp_out);
} else {
local_time = -omp_get_wtime();
while ((file = strtok_r(file_names, ",", &file_names)))
{
if (strlen(file) > 0)
{
queue->finished = 0;
populateQueue(queue, file); // read file
queue->finished = 1;
populateHashMap(queue, hash_table); // map file
}
}
MPI_Barrier(MPI_COMM_WORLD);
local_time += omp_get_wtime();
global_time += local_time;
sprintf(tmp_out, "%.4f, ", local_time);
strcat(csv_out, tmp_out);
}
MPI_Barrier(MPI_COMM_WORLD);
/*******************************************************************************
* add reduction - hashtable should be communicated amoung the
* processes to come up with the final reduction
********************************************************************************/
local_time = -omp_get_wtime();
int h_space = HASH_CAPACITY / size;
int h_start = h_space * pid;
int h_end = h_space * (pid + 1);
// fprintf(outfile, "start [%d] end [%d]\n", h_start, h_end);
// [0, HASH_CAPACITY/size] values from all the processes should be sent to 0th
// process [HASH_CAPACITY/size, HASH_CAPACITY/size*2] values from all the ps should be
// sent to 1st process likewise all data should be shared among the processes
// --------- DEFINE THE STRUCT DATA TYPE TO SEND
const int nfields = 3;
MPI_Aint disps[nfields];
int blocklens[] = {1, 1, WORD_MAX_LENGTH};
MPI_Datatype types[] = {MPI_INT, MPI_INT, MPI_CHAR};
disps[0] = offsetof(pair, hash);
disps[1] = offsetof(pair, count);
disps[2] = offsetof(pair, word);
MPI_Datatype istruct;
MPI_Type_create_struct(nfields, blocklens, disps, types, &istruct);
MPI_Type_commit(&istruct);
// ---
int k = 0;
for (k = 0; k < size; k++)
{
if (pid != k)
{
int j = 0;
pair pairs[HASH_CAPACITY];
struct node *current = NULL;
for (int i = h_space * k; i < h_space * (k + 1); i++)
{
current = hash_table->table[i];
if (current == NULL)
continue;
while (current != NULL)
{
pairs[j].count = current->frequency;
pairs[j].hash = i;
strcpy(pairs[j].word, current->key);
j++;
current = current->next;
}
}
// fprintf(outfile, "total words to send: %d\n", j);
MPI_Send(pairs, j, istruct, k, TAG_COMM_PAIR_LIST, MPI_COMM_WORLD);
// fprintf(outfile, "total words sent: %d\n", j);
}
else if (pid == k)
{
for (int pr = 0; pr < size - 1; pr++)
{
int recv_j = 0;
pair recv_pairs[HASH_CAPACITY];
MPI_Recv(recv_pairs, HASH_CAPACITY, istruct, MPI_ANY_SOURCE,
TAG_COMM_PAIR_LIST, MPI_COMM_WORLD, &status);
MPI_Get_count(&status, istruct, &recv_j);
// fprintf(outfile, "total words to received: %d from source: %d\n",
// recv_j, status.MPI_SOURCE);
for (int i = 0; i < recv_j; i++)
{
pair recv_pair = recv_pairs[i];
int frequency = recv_pair.count;
struct node *node = add(hash_table, recv_pair.word, 0);
node->frequency += recv_pair.count;
}
}
}
}
MPI_Barrier(MPI_COMM_WORLD);
local_time += omp_get_wtime();
global_time += local_time;
sprintf(tmp_out, "%.4f, ", local_time);
strcat(csv_out, tmp_out);
// --------------------------------------------------------------
local_time = -omp_get_wtime();
// write function should be only called for the respective section of the
writeTable(hash_table, outfile, h_start, h_end);
// writeTable(hash_table, outfile, 0, hash_table->tablesize);
local_time += omp_get_wtime();
global_time += local_time;
sprintf(tmp_out, "%.4f, ", local_time);
strcat(csv_out, tmp_out);
sprintf(tmp_out, "%.4f", global_time);
strcat(csv_out, tmp_out);
// fprintf(stdout, "total time taken for the execution: %f\n", global_time);
if (pid == 0) {
if (BREAK_RM) {
fprintf(stdout, "Num_Files, Hash_size, Num_Processes, FS_Time, Read, Map, Reduce, Write, Total\n%s\n\n",
csv_out);
} else {
fprintf(stdout, "Num_Files, Hash_size, Num_Processes, FS_Time, Read_Map, Reduce, Write, Total\n%s\n\n",
csv_out);
}
}
MPI_Finalize();
return 0;
}