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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

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#include <ross.h>
#include <assert.h>

#include "codes/lp-io.h"
#include "codes/codes_mapping.h"
#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
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#include "codes/model-net-lp.h"
#include "codes/net/torus.h"
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#define CHUNK_SIZE 32
#define DEBUG 1
#define MEAN_INTERVAL 100
#define TRACE -1 

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/* collective specific parameters */
#define TREE_DEGREE 4
#define LEVEL_DELAY 1000
#define TORUS_COLLECTIVE_DEBUG 1
#define NUM_COLLECTIVES  1
#define COLLECTIVE_COMPUTATION_DELAY 5700
#define TORUS_FAN_OUT_DELAY 20.0

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#define LP_CONFIG_NM (model_net_lp_config_names[TORUS])
#define LP_METHOD_NM (model_net_method_names[TORUS])

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/* Torus network model implementation of codes, implements the modelnet API */

/* Link bandwidth for each torus link, configurable from the config file */
static double link_bandwidth;
/* buffer size of each torus link, configurable */
static int buffer_size;
/* number of virtual channels for each torus link, configurable */
static int num_vc;
/* number of torus dimensions, configurable */
static int n_dims;
/* length of each torus dimension, configurable */
static int * dim_length;
/* factor, used in torus coordinate calculation */
static int * factor;
/* half length of each dimension, used in torus coordinates calculation */
static int * half_length;
/* size of each torus chunk, by default it is set to 32 */
static int chunk_size;

/* codes mapping group name, lp type name */
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static char grp_name[MAX_NAME_LENGTH];
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/* codes mapping group id, lp type id, repetition id and offset */
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int mapping_grp_id, mapping_rep_id, mapping_type_id, mapping_offset;
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/* for calculating torus model statistics, average and maximum travel time of a packet */
static tw_stime         total_time = 0;
static tw_stime         max_latency = 0;
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static tw_stime         max_collective = 0;
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/* indicates delays calculated through the bandwidth calculation of the torus link */
static float head_delay=0.0;
static float credit_delay = 0.0;

/* number of finished packets on each PE */
static long long       N_finished_packets = 0;
/* total number of hops traversed by a message on each PE */
static long long       total_hops = 0;

/* number of chunks/flits in each torus packet, calculated through the size of each flit (32 bytes by default) */
static uint64_t num_chunks;

typedef struct nodes_state nodes_state;

/* state of a torus node */
struct nodes_state
{
  /* counts the number of packets sent from this compute node */
  unsigned long long packet_counter;            
  /* availability time of each torus link */
  tw_stime** next_link_available_time; 
  /* availability of each torus credit link */
  tw_stime** next_credit_available_time;
  /* next flit generate time */
  tw_stime** next_flit_generate_time;
  /* buffer size for each torus virtual channel */
  int** buffer;
  /* coordinates of the current torus node */
  int* dim_position;
  /* neighbor LP ids for this torus node */
  int* neighbour_minus_lpID;
  int* neighbour_plus_lpID;

  /* records torus statistics for this LP having different communication categories */
  struct mn_stats torus_stats_array[CATEGORY_MAX];
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   /* for collective operations */

  /* collective init time */
  tw_stime collective_init_time;

  /* node ID in the tree */ 
   tw_lpid node_id;

   /* messages sent & received in collectives may get interchanged several times so we have to save the 
     origin server information in the node's state */
   tw_lpid origin_svr; 
  
  /* parent node ID of the current node */
   tw_lpid parent_node_id;
   /* array of children to be allocated in terminal_init*/
   tw_lpid* children;

   /* children of a node can be less than or equal to the tree degree */
   int num_children;

   short is_root;
   short is_leaf;

   /* to maintain a count of child nodes that have fanned in at the parent during the collective
      fan-in phase*/
   int num_fan_nodes;
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};

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/* setup the torus model, initialize global parameters */
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static void torus_setup(const void* net_params)
{
    int i;
    torus_param* t_param = (torus_param*)net_params;
    n_dims = t_param->n_dims;
    link_bandwidth = t_param->link_bandwidth;
    buffer_size = t_param->buffer_size;
    num_vc = t_param->num_vc;
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    chunk_size = t_param->chunk_size;
    head_delay = (1 / link_bandwidth) * chunk_size;
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    credit_delay = (1 / link_bandwidth) * 8;
    dim_length = malloc(n_dims * sizeof(int));
    factor = malloc(n_dims * sizeof(int));
    half_length = malloc(n_dims * sizeof(int));
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    for(i = 0; i < n_dims; i++)
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    {
       dim_length[i] = t_param->dim_length[i]; 
       if(!dim_length[i])
	       dim_length[i] = 8;
    }
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}

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void torus_collective_init(nodes_state * s,
           		   tw_lp * lp)
{
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    // TODO: be annotation-aware somehow 
    codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    int num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM, NULL, 1);
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    int num_reps = codes_mapping_get_group_reps(grp_name);
    s->node_id = (mapping_rep_id * num_lps) + mapping_offset;

    int i;
   /* handle collective operations by forming a tree of all the LPs */
   /* special condition for root of the tree */
   if( s->node_id == 0)
    {
        s->parent_node_id = -1;
        s->is_root = 1;
   }
   else
   {
       s->parent_node_id = (s->node_id - ((s->node_id - 1) % TREE_DEGREE)) / TREE_DEGREE;
       s->is_root = 0;
   }
   s->children = (tw_lpid*)malloc(TREE_DEGREE * sizeof(tw_lpid));

   /* set the isleaf to zero by default */
   s->is_leaf = 1;
   s->num_children = 0;

   /* calculate the children of the current node. If its a leaf, no need to set children,
      only set isleaf and break the loop*/

   for( i = 0; i < TREE_DEGREE; i++ )
    {
        tw_lpid next_child = (TREE_DEGREE * s->node_id) + i + 1;
        if(next_child < (num_lps * num_reps))
        {
            s->num_children++;
            s->is_leaf = 0;
            s->children[i] = next_child;
        }
        else
           s->children[i] = -1;
    }

#if TORUS_COLLECTIVE_DEBUG == 1
   printf("\n LP %ld parent node id ", s->node_id);

   for( i = 0; i < TREE_DEGREE; i++ )
        printf(" child node ID %ld ", s->children[i]);
   printf("\n");

   if(s->is_leaf)
        printf("\n LP %ld is leaf ", s->node_id);
#endif
}
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/* torus packet reverse event */
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static void torus_packet_event_rc(tw_lp *sender)
{
  codes_local_latency_reverse(sender);
  return;
}

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/* returns the torus message size */
static int torus_get_msg_sz(void)
{
   return sizeof(nodes_message);
}

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/* torus packet event , generates a torus packet on the compute node */
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static tw_stime torus_packet_event(char* category, tw_lpid final_dest_lp, uint64_t packet_size, int is_pull, uint64_t pull_size, tw_stime offset, int remote_event_size, const void* remote_event, int self_event_size, const void* self_event, tw_lpid src_lp, tw_lp *sender, int is_last_pckt)
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{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    nodes_message * msg;
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    tw_lpid dest_nic_id;
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    char* tmp_ptr;
   
    int mapping_grp_id, mapping_rep_id, mapping_type_id, mapping_offset;
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    // TODO: be annotation-aware
    codes_mapping_get_lp_info(final_dest_lp, grp_name, &mapping_grp_id, NULL,
            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1, mapping_rep_id,
            mapping_offset, &dest_nic_id);
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    /* TODO: Should send the packets in correct sequence. Currently the last packet is being sent first due to codes_local_latency offset. */
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    xfer_to_nic_time = g_tw_lookahead + codes_local_latency(sender); /* Throws an error of found last KP time > current event time otherwise */
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    //e_new = tw_event_new(local_nic_id, xfer_to_nic_time+offset, sender);
    //msg = tw_event_data(e_new);
    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, TORUS, (void**)&msg, (void**)&tmp_ptr);
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    strcpy(msg->category, category);
    msg->final_dest_gid = final_dest_lp;
    msg->dest_lp = dest_nic_id;
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    msg->sender_svr= src_lp;
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    msg->packet_size = packet_size;
    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
    msg->type = GENERATE;
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    msg->is_pull = is_pull;
    msg->pull_size = pull_size;
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    num_chunks = msg->packet_size/chunk_size;

    if(msg->packet_size % chunk_size)
    {
	    num_chunks++;
    }
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    if(is_last_pckt) /* Its the last packet so pass in remote event information*/
     {
	if(remote_event_size > 0)
	 {
	    msg->remote_event_size_bytes = remote_event_size;
	    memcpy(tmp_ptr, remote_event, remote_event_size);
	    tmp_ptr += remote_event_size;
         }
	if(self_event_size > 0)
	{
	   msg->local_event_size_bytes = self_event_size;
	   memcpy(tmp_ptr, self_event, self_event_size);
	   tmp_ptr += self_event_size;
	}
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      // printf("\n torus remote event %d local event %d last packet %d %lf ", msg->remote_event_size_bytes, msg->local_event_size_bytes, is_last_pckt, xfer_to_nic_time);
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     }
    tw_event_send(e_new);
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    return xfer_to_nic_time;
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}
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/*Initialize the torus model, this initialization part is borrowed from Ning's torus model */
static void torus_init( nodes_state * s, 
	   tw_lp * lp )
{
    int i, j;
    int dim_N[ n_dims + 1 ];

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    // TODO: be annotation-aware 
    codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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    dim_N[ 0 ]=mapping_rep_id + mapping_offset;
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    s->neighbour_minus_lpID = (int*)malloc(n_dims * sizeof(int));
    s->neighbour_plus_lpID = (int*)malloc(n_dims * sizeof(int));
    s->dim_position = (int*)malloc(n_dims * sizeof(int));
    s->buffer = (int**)malloc(2*n_dims * sizeof(int*));
    s->next_link_available_time = (tw_stime**)malloc(2*n_dims * sizeof(tw_stime*));
    s->next_credit_available_time = (tw_stime**)malloc(2*n_dims * sizeof(tw_stime*));
    s->next_flit_generate_time = (tw_stime**)malloc(2*n_dims*sizeof(tw_stime*));

    for(i=0; i < 2*n_dims; i++)
    {
	s->buffer[i] = (int*)malloc(num_vc * sizeof(int));
	s->next_link_available_time[i] = (tw_stime*)malloc(num_vc * sizeof(tw_stime));
	s->next_credit_available_time[i] = (tw_stime*)malloc(num_vc * sizeof(tw_stime));
	s->next_flit_generate_time[i] = (tw_stime*)malloc(num_vc * sizeof(tw_stime));
    }

    //printf("\n LP ID %d ", (int)lp->gid);
  // calculate my torus co-ordinates
  for ( i=0; i < n_dims; i++ ) 
    {
      s->dim_position[ i ] = dim_N[ i ]%dim_length[ i ];
      //printf(" dim position %d ", s->dim_position[i]);
      dim_N[ i + 1 ] = ( dim_N[ i ] - s->dim_position[ i ] )/dim_length[ i ];

      half_length[ i ] = dim_length[ i ] / 2;
    }
   //printf("\n");

  factor[ 0 ] = 1;
  for ( i=1; i < n_dims; i++ )
    {
      factor[ i ] = 1;
      for ( j = 0; j < i; j++ )
        factor[ i ] *= dim_length[ j ];
    }
  int temp_dim_pos[ n_dims ];
  for ( i = 0; i < n_dims; i++ )
    temp_dim_pos[ i ] = s->dim_position[ i ];

  tw_lpid neighbor_id;
  // calculate minus neighbour's lpID
  for ( j = 0; j < n_dims; j++ )
    {
      temp_dim_pos[ j ] = (s->dim_position[ j ] -1 + dim_length[ j ]) % dim_length[ j ];

      s->neighbour_minus_lpID[ j ] = 0;
      
      for ( i = 0; i < n_dims; i++ )
        s->neighbour_minus_lpID[ j ] += factor[ i ] * temp_dim_pos[ i ];
      
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      codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
              s->neighbour_minus_lpID[ j ], 0, &neighbor_id);
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      //printf("\n neighbor %d lp id %d ", (int)s->neighbour_minus_lpID[ j ], (int)neighbor_id);
      
      temp_dim_pos[ j ] = s->dim_position[ j ];
    }
  // calculate plus neighbour's lpID
  for ( j = 0; j < n_dims; j++ )
    {
      temp_dim_pos[ j ] = ( s->dim_position[ j ] + 1 + dim_length[ j ]) % dim_length[ j ];

      s->neighbour_plus_lpID[ j ] = 0;
      
      for ( i = 0; i < n_dims; i++ )
        s->neighbour_plus_lpID[ j ] += factor[ i ] * temp_dim_pos[ i ];

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      codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
              s->neighbour_plus_lpID[ j ], 0, &neighbor_id);
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      //printf("\n neighbor %d lp id %d ", (int)s->neighbour_plus_lpID[ j ], (int)neighbor_id);
      
      temp_dim_pos[ j ] = s->dim_position[ j ];
    }

  //printf("\n");
  for( j=0; j < 2 * n_dims; j++ )
   {
    for( i = 0; i < num_vc; i++ )
     {
       s->buffer[ j ][ i ] = 0; 
       s->next_link_available_time[ j ][ i ] = 0.0;
       s->next_credit_available_time[j][i] = 0.0; 
     }
   }
  // record LP time
    s->packet_counter = 0;
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    torus_collective_init(s, lp);
}


/* collective operation for the torus network */
void torus_collective(char* category, int message_size, int remote_event_size, const void* remote_event, tw_lp* sender)
{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    nodes_message * msg;
    tw_lpid local_nic_id;
    char* tmp_ptr;

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    // TODO: be annotation-aware
    codes_mapping_get_lp_info(sender->gid, grp_name, &mapping_grp_id, NULL,
            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
            mapping_rep_id, mapping_offset, &local_nic_id);
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    xfer_to_nic_time = g_tw_lookahead + codes_local_latency(sender);
    e_new = model_net_method_event_new(local_nic_id, xfer_to_nic_time,
            sender, TORUS, (void**)&msg, (void**)&tmp_ptr);

    msg->remote_event_size_bytes = message_size;
    strcpy(msg->category, category);
    msg->sender_svr=sender->gid;
    msg->type = T_COLLECTIVE_INIT;

    tmp_ptr = (char*)msg;
    tmp_ptr += torus_get_msg_sz();
    if(remote_event_size > 0)
     {
            msg->remote_event_size_bytes = remote_event_size;
            memcpy(tmp_ptr, remote_event, remote_event_size);
            tmp_ptr += remote_event_size;
     }

    tw_event_send(e_new);
    return;
}

/* reverse for collective operation of the dragonfly network */
void torus_collective_rc(int message_size, tw_lp* sender)
{
     codes_local_latency_reverse(sender);
     return;
}

static void send_remote_event(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
    // Trigger an event on receiving server
    if(msg->remote_event_size_bytes)
     {
            tw_event* e;
            tw_stime ts;
            nodes_message * m;
            ts = (1/link_bandwidth) * msg->remote_event_size_bytes;
            e = codes_event_new(s->origin_svr, ts, lp);
            m = tw_event_data(e);
            char* tmp_ptr = (char*)msg;
            tmp_ptr += torus_get_msg_sz();
            memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
            tw_event_send(e);
     }
}

static void node_collective_init(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
        tw_event * e_new;
        tw_lpid parent_nic_id;
        tw_stime xfer_to_nic_time;
        nodes_message * msg_new;
        int num_lps;

        msg->saved_collective_init_time = s->collective_init_time;
        s->collective_init_time = tw_now(lp);
	s->origin_svr = msg->sender_svr;
	
        if(s->is_leaf)
        {
            //printf("\n LP %ld sending message to parent %ld ", s->node_id, s->parent_node_id);
            /* get the global LP ID of the parent node */
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            // TODO: be annotation-aware
            codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL,
                    &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
            num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM,
                    NULL, 1);
            codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
	    void* m_data;
	    e_new = model_net_method_event_new(parent_nic_id, xfer_to_nic_time,
            	lp, TORUS, (void**)&msg_new, (void**)&m_data);
	    	
            memcpy(msg_new, msg, sizeof(nodes_message));
	    if (msg->remote_event_size_bytes){
        	memcpy(m_data, model_net_method_get_edata(TORUS, msg),
                	msg->remote_event_size_bytes);
      	    }
	    
            msg_new->type = T_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            tw_event_send(e_new);
        }
        return;
}

static void node_collective_fan_in(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
        int i;
        s->num_fan_nodes++;

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        // TODO: be annotation-aware
        codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL,
                &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
        int num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM,
                NULL, 1);
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        tw_event* e_new;
        nodes_message * msg_new;
        tw_stime xfer_to_nic_time;

        bf->c1 = 0;
        bf->c2 = 0;

        /* if the number of fanned in nodes have completed at the current node then signal the parent */
        if((s->num_fan_nodes == s->num_children) && !s->is_root)
        {
            bf->c1 = 1;
            msg->saved_fan_nodes = s->num_fan_nodes-1;
            s->num_fan_nodes = 0;
            tw_lpid parent_nic_id;
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;

            /* get the global LP ID of the parent node */
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            codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
            //msg_new = tw_event_data(e_new);
	    void * m_data;
      	    e_new = model_net_method_event_new(parent_nic_id,
              xfer_to_nic_time,
              lp, TORUS, (void**)&msg_new, &m_data);
	    
            memcpy(msg_new, msg, sizeof(nodes_message));
            msg_new->type = T_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            if (msg->remote_event_size_bytes){
	        memcpy(m_data, model_net_method_get_edata(TORUS, msg),
        	        msg->remote_event_size_bytes);
      	   }
	    
            tw_event_send(e_new);
      }

      /* root node starts off with the fan-out phase */
      if(s->is_root && (s->num_fan_nodes == s->num_children))
      {
           bf->c2 = 1;
           msg->saved_fan_nodes = s->num_fan_nodes-1;
           s->num_fan_nodes = 0;
           send_remote_event(s, bf, msg, lp);

           for( i = 0; i < s->num_children; i++ )
           {
                tw_lpid child_nic_id;
                /* Do some computation and fan out immediate child nodes from the collective */
                xfer_to_nic_time = g_tw_lookahead + COLLECTIVE_COMPUTATION_DELAY + LEVEL_DELAY + tw_rand_exponential(lp->rng, (double)LEVEL_DELAY/50);

                /* get global LP ID of the child node */
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                codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                        s->children[i]/num_lps, (s->children[i] % num_lps),
                        &child_nic_id);
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                //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);

                //msg_new = tw_event_data(e_new);
                void * m_data;
	        e_new = model_net_method_event_new(child_nic_id,
                xfer_to_nic_time,
		lp, TORUS, (void**)&msg_new, &m_data);

		memcpy(msg_new, msg, sizeof(nodes_message));
	        if (msg->remote_event_size_bytes){
	                memcpy(m_data, model_net_method_get_edata(TORUS, msg),
        	               msg->remote_event_size_bytes);
      		}
		
                msg_new->type = T_COLLECTIVE_FAN_OUT;
                msg_new->sender_node = s->node_id;

                tw_event_send(e_new);
           }
      }
586
}
587 588 589 590 591 592 593
	     
static void node_collective_fan_out(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
        int i;
594 595 596
        //TODO: be annotation-aware
        int num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM,
                NULL, 1);
597 598 599 600
        bf->c1 = 0;
        bf->c2 = 0;

        send_remote_event(s, bf, msg, lp);
601

602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
        if(!s->is_leaf)
        {
            bf->c1 = 1;
            tw_event* e_new;
            nodes_message * msg_new;
            tw_stime xfer_to_nic_time;

           for( i = 0; i < s->num_children; i++ )
           {
                xfer_to_nic_time = g_tw_lookahead + TORUS_FAN_OUT_DELAY + tw_rand_exponential(lp->rng, (double)TORUS_FAN_OUT_DELAY/10);

                if(s->children[i] > 0)
                {
                        tw_lpid child_nic_id;

                        /* get global LP ID of the child node */
618 619 620
                        codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                                s->children[i]/num_lps,
                                (s->children[i] % num_lps), &child_nic_id);
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
                        //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);
                        //msg_new = tw_event_data(e_new);
                        //memcpy(msg_new, msg, sizeof(nodes_message) + msg->remote_event_size_bytes);
			void* m_data;
			e_new = model_net_method_event_new(child_nic_id,
							xfer_to_nic_time,
					                lp, TORUS, (void**)&msg_new, &m_data);
		        memcpy(msg_new, msg, sizeof(nodes_message));
		        if (msg->remote_event_size_bytes){
			        memcpy(m_data, model_net_method_get_edata(TORUS, msg),
			                msg->remote_event_size_bytes);
      			}


                        msg_new->type = T_COLLECTIVE_FAN_OUT;
                        msg_new->sender_node = s->node_id;
                        tw_event_send(e_new);
                }
           }
         }
	//printf("\n Fan out phase completed %ld ", lp->gid);
        if(max_collective < tw_now(lp) - s->collective_init_time )
          {
              bf->c2 = 1;
              max_collective = tw_now(lp) - s->collective_init_time;
          }
}
    
649 650 651 652 653 654 655 656 657 658 659
/*Returns the next neighbor to which the packet should be routed by using DOR (Taken from Ning's code of the torus model)*/
static void dimension_order_routing( nodes_state * s,
			     tw_lpid * dst_lp, 
			     int * dim, 
			     int * dir )
{
  int dim_N[n_dims], 
      dest[n_dims],
      i,
      dest_id=0;

660 661
  //TODO: be annotation-aware
  codes_mapping_get_lp_info(*dst_lp, grp_name, &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
662
  dim_N[ 0 ]=mapping_rep_id + mapping_offset;
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701

  // find destination dimensions using destination LP ID 
  for ( i = 0; i < n_dims; i++ )
    {
      dest[ i ] = dim_N[ i ] % dim_length[ i ];
      dim_N[ i + 1 ] = ( dim_N[ i ] - dest[ i ] ) / dim_length[ i ];
    }

  for( i = 0; i < n_dims; i++ )
    {
      if ( s->dim_position[ i ] - dest[ i ] > half_length[ i ] )
	{
	  dest_id = s->neighbour_plus_lpID[ i ];
	  *dim = i;
	  *dir = 1;
	  break;
	}
      if ( s->dim_position[ i ] - dest[ i ] < -half_length[ i ] )
	{
	  dest_id = s->neighbour_minus_lpID[ i ];
	  *dim = i;
	  *dir = 0;
	  break;
	}
      if ( ( s->dim_position[ i ] - dest[ i ] <= half_length[ i ] ) && ( s->dim_position[ i ] - dest[ i ] > 0 ) )
	{
	  dest_id = s->neighbour_minus_lpID[ i ];
	  *dim = i;
	  *dir = 0;
	  break;
	}
      if (( s->dim_position[ i ] - dest[ i ] >= -half_length[ i ] ) && ( s->dim_position[ i ] - dest[ i ] < 0) )
	{
	  dest_id = s->neighbour_plus_lpID[ i ];
	  *dim = i;
	  *dir = 1;
	  break;
	}
    }
702
  codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1, dest_id, 0, dst_lp);
703
}
704 705 706 707 708 709

/*Generates a packet. If there is a buffer slot available, then the packet is 
injected in the network. Else, a buffer overflow exception is thrown.
TODO: We might want to modify this so that if the buffer is full, the packet
injection is delayed in turn slowing down the injection rate. The average achieved
injection rate can be reported at the end of the simulation. */
710 711 712 713 714 715
static void packet_generate( nodes_state * s, 
		tw_bf * bf, 
		nodes_message * msg, 
		tw_lp * lp )
{
//    printf("\n msg local event size %d remote event size %d ", msg->local_event_size_bytes, msg->remote_event_size_bytes);
716
    int j, tmp_dir=-1, tmp_dim=-1, total_event_size;
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
    tw_stime ts;

//    event triggered when packet head is sent
    tw_event * e_h;
    nodes_message *m;

    tw_lpid dst_lp = msg->dest_lp; 
    dimension_order_routing( s, &dst_lp, &tmp_dim, &tmp_dir );

    msg->saved_src_dim = tmp_dim;
    msg->saved_src_dir = tmp_dir;

    //msg->saved_available_time = s->next_flit_generate_time[(2*tmp_dim) + tmp_dir][0];
    msg->travel_start_time = tw_now(lp);
    msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter;
732
    msg->my_N_hop = 0;
733

734

735 736 737 738 739 740 741 742 743 744 745 746
    s->packet_counter++;

    if(msg->packet_ID == TRACE)
	    printf("\n packet generated %lld at lp %d dest %d final dest %d", msg->packet_ID, (int)lp->gid, (int)dst_lp, (int)msg->dest_lp);
    for(j = 0; j < num_chunks; j++)
    { 
     if(s->buffer[ tmp_dir + ( tmp_dim * 2 ) ][ 0 ] < buffer_size)
      {
       ts = j + tw_rand_exponential(lp->rng, MEAN_INTERVAL/200);
       //s->next_flit_generate_time[(2*tmp_dim) + tmp_dir][0] = max(s->next_flit_generate_time[(2*tmp_dim) + tmp_dir][0], tw_now(lp));
       //s->next_flit_generate_time[(2*tmp_dim) + tmp_dir][0] += ts;
       //e_h = tw_event_new( lp->gid, s->next_flit_generate_time[(2*tmp_dim) + tmp_dir][0] - tw_now(lp), lp);
747
       //e_h = tw_event_new(lp->gid, ts, lp);
748 749 750
       msg->source_direction = tmp_dir;
       msg->source_dim = tmp_dim;

751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
       void *m_data;
       e_h = model_net_method_event_new(lp->gid, ts, lp, TORUS, (void**)&m,
               (void**)&m_data);

       //m = tw_event_data( e_h );
       //memcpy(m, msg, torus_get_msg_sz() + msg->local_event_size_bytes + msg->remote_event_size_bytes);
       void *m_data_src = model_net_method_get_edata(TORUS, msg);
       memcpy(m, msg, sizeof(nodes_message));
       if (msg->remote_event_size_bytes){
           memcpy(m_data, m_data_src,
                   msg->remote_event_size_bytes);
           m_data = (char*)m_data + msg->remote_event_size_bytes;
           m_data_src = (char*)m_data_src + msg->remote_event_size_bytes;
       }
       if (msg->local_event_size_bytes){
           memcpy(m_data, m_data_src, msg->local_event_size_bytes);
       }
768 769 770 771 772 773 774 775 776 777 778 779
       m->next_stop = dst_lp;
       m->chunk_id = j;

      // find destination dimensions using destination LP ID 
       m->type = SEND;
       m->source_direction = tmp_dir;
       m->source_dim = tmp_dim;
       tw_event_send(e_h);
      }
      else 
       {
   printf("\n %d Packet queued in line increase buffer space, dir %d dim %d buffer space %d dest LP %d ", (int)lp->gid, tmp_dir, tmp_dim, s->buffer[ tmp_dir + ( tmp_dim * 2 ) ][ 0 ], (int)msg->dest_lp);
780 781
       MPI_Finalize();
       exit(-1); 
782 783
       }
   }
784

785
   total_event_size = model_net_get_msg_sz(TORUS) + msg->remote_event_size_bytes + msg->local_event_size_bytes;   
786 787 788 789 790 791 792 793 794
   /* record the statistics of the generated packets */
   mn_stats* stat;
   stat = model_net_find_stats(msg->category, s->torus_stats_array);
   stat->send_count++;  
   stat->send_bytes += msg->packet_size;
   stat->send_time += (1/link_bandwidth) * msg->packet_size;
   /* record the maximum ROSS event size */
   if(stat->max_event_size < total_event_size)
	   stat->max_event_size = total_event_size;
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
}
/*Sends a 8-byte credit back to the torus node LP that sent the message */
static void credit_send( nodes_state * s, 
	    tw_bf * bf, 
	    tw_lp * lp, 
	    nodes_message * msg)
{
#if DEBUG
//if(lp->gid == TRACK_LP)
//	printf("\n (%lf) sending credit tmp_dir %d tmp_dim %d %lf ", tw_now(lp), msg->source_direction, msg->source_dim, credit_delay );
#endif
    bf->c1 = 0;
    tw_event * buf_e;
    nodes_message *m;
    tw_stime ts;
    int src_dir = msg->source_direction;
    int src_dim = msg->source_dim;

    msg->saved_available_time = s->next_credit_available_time[(2 * src_dim) + src_dir][0];
    s->next_credit_available_time[(2 * src_dim) + src_dir][0] = max(s->next_credit_available_time[(2 * src_dim) + src_dir][0], tw_now(lp));
    ts =  credit_delay + tw_rand_exponential(lp->rng, credit_delay/1000);
    s->next_credit_available_time[(2 * src_dim) + src_dir][0] += ts;

818 819
    //buf_e = tw_event_new( msg->sender_lp, s->next_credit_available_time[(2 * src_dim) + src_dir][0] - tw_now(lp), lp);
    //m = tw_event_data(buf_e);
820
    buf_e = model_net_method_event_new(msg->sender_node,
821 822
            s->next_credit_available_time[(2*src_dim) + src_dir][0] - tw_now(lp),
            lp, TORUS, (void**)&m, NULL);
823 824 825 826 827 828
    m->source_direction = msg->source_direction;
    m->source_dim = msg->source_dim;

    m->type = CREDIT;
    tw_event_send( buf_e );
}
829 830
/* send a packet from one torus node to another torus node
 A packet can be up to 256 bytes on BG/L and BG/P and up to 512 bytes on BG/Q */
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
static void packet_send( nodes_state * s, 
	         tw_bf * bf, 
		 nodes_message * msg, 
		 tw_lp * lp )
{ 
    bf->c2 = 0;
    bf->c1 = 0;
    int tmp_dir, tmp_dim;
    tw_stime ts;
    tw_event *e;
    nodes_message *m;
    tw_lpid dst_lp = msg->dest_lp;
    dimension_order_routing( s, &dst_lp, &tmp_dim, &tmp_dir );     

    if(s->buffer[ tmp_dir + ( tmp_dim * 2 ) ][ 0 ] < buffer_size)
    {
       bf->c2 = 1;
       msg->saved_src_dir = tmp_dir;
       msg->saved_src_dim = tmp_dim;
       ts = tw_rand_exponential( lp->rng, ( double )head_delay/200 )+ head_delay;

//    For reverse computation 
      msg->saved_available_time = s->next_link_available_time[tmp_dir + ( tmp_dim * 2 )][0];

      s->next_link_available_time[tmp_dir + ( tmp_dim * 2 )][0] = max( s->next_link_available_time[ tmp_dir + ( tmp_dim * 2 )][0], tw_now(lp) );
      s->next_link_available_time[tmp_dir + ( tmp_dim * 2 )][0] += ts;
    
858 859 860 861 862 863 864 865 866 867 868 869
      //e = tw_event_new( dst_lp, s->next_link_available_time[tmp_dir + ( tmp_dim * 2 )][0] - tw_now(lp), lp );
      //m = tw_event_data( e );
      //memcpy(m, msg, torus_get_msg_sz() + msg->remote_event_size_bytes);
      void * m_data;
      e = model_net_method_event_new(dst_lp, 
              s->next_link_available_time[tmp_dir+(tmp_dim*2)][0] - tw_now(lp),
              lp, TORUS, (void**)&m, &m_data);
      memcpy(m, msg, sizeof(nodes_message));
      if (msg->remote_event_size_bytes){
        memcpy(m_data, model_net_method_get_edata(TORUS, msg),
                msg->remote_event_size_bytes);
      }
870 871 872 873 874 875 876 877
      m->type = ARRIVAL;

      if(msg->packet_ID == TRACE)
        printf("\n lp %d packet %lld flit id %d being sent to %d after time %lf ", (int) lp->gid, msg->packet_ID, msg->chunk_id, (int)dst_lp, s->next_link_available_time[tmp_dir + ( tmp_dim * 2 )][0] - tw_now(lp)); 
      //Carry on the message info
      m->source_dim = tmp_dim;
      m->source_direction = tmp_dir;
      m->next_stop = dst_lp;
878
      m->sender_node = lp->gid;
879 880 881 882 883 884 885 886 887
      m->local_event_size_bytes = 0; /* We just deliver the local event here */

      tw_event_send( e );

      s->buffer[ tmp_dir + ( tmp_dim * 2 ) ][ 0 ]++;
    
      if(msg->chunk_id == num_chunks - 1)
      {
        bf->c1 = 1;
888
	/* Invoke an event on the sending server */
889 890 891 892
	if(msg->local_event_size_bytes > 0)
	{
          tw_event* e_new;
	  nodes_message* m_new;
893
	  void* local_event;
894
	  ts = (1/link_bandwidth) * msg->local_event_size_bytes;
895
	  e_new = tw_event_new(msg->sender_svr, ts, lp);
896
	  m_new = tw_event_data(e_new);
897 898 899 900
	  //local_event = (char*)msg;
	  //local_event += torus_get_msg_sz() + msg->remote_event_size_bytes;
          local_event = (char*)model_net_method_get_edata(TORUS, msg) +
              msg->remote_event_size_bytes;
901 902 903 904 905 906
	  memcpy(m_new, local_event, msg->local_event_size_bytes);
	  tw_event_send(e_new);
	}
     }
  } // end if
    else
907
    {
908
	    printf("\n buffer overflown ");
909 910 911
	    MPI_Finalize();
	    exit(-1);
    }
912 913
}

914 915 916
/*Processes the packet after it arrives from the neighboring torus node 
 * routes it to the next compute node if this is not the destination
 * OR if this is the destination then a remote event at the server is issued. */
917 918 919 920 921 922 923 924 925
static void packet_arrive( nodes_state * s, 
		    tw_bf * bf, 
		    nodes_message * msg, 
		    tw_lp * lp )
{
  bf->c2 = 0;
  tw_event *e;
  tw_stime ts;
  nodes_message *m;
926
  mn_stats* stat;
927

928
  credit_send( s, bf, lp, msg); 
929 930 931 932 933 934 935 936 937 938
  
  msg->my_N_hop++;
  ts = 0.1 + tw_rand_exponential(lp->rng, MEAN_INTERVAL/200);
  if(msg->packet_ID == TRACE)
	  printf("\n packet arrived at lp %d final dest %d ", (int)lp->gid, (int)msg->dest_lp);
  if( lp->gid == msg->dest_lp )
    {   
        if( msg->chunk_id == num_chunks - 1 )    
        {
	    bf->c2 = 1;
939 940 941 942 943 944
	    stat = model_net_find_stats(msg->category, s->torus_stats_array);
	    stat->recv_count++;
	    stat->recv_bytes += msg->packet_size;
	    stat->recv_time += tw_now( lp ) - msg->travel_start_time;

	    /*count the number of packets completed overall*/
945 946 947 948 949 950 951 952 953 954 955 956 957
	    N_finished_packets++;
	    total_time += tw_now( lp ) - msg->travel_start_time;
	    total_hops += msg->my_N_hop;

	    if (max_latency < tw_now( lp ) - msg->travel_start_time) {
		  bf->c3 = 1;
		  msg->saved_available_time = max_latency;
	          max_latency=tw_now( lp ) - msg->travel_start_time;
     		}
	    // Trigger an event on receiving server
	    if(msg->remote_event_size_bytes)
	    {
	       ts = (1/link_bandwidth) * msg->remote_event_size_bytes;
958
               void *tmp_ptr = model_net_method_get_edata(TORUS, msg);
959
               if (msg->is_pull){
960
                   int net_id = model_net_get_id(LP_METHOD_NM);
961
                   model_net_event(net_id, msg->category, msg->sender_svr,
962 963 964 965 966 967 968 969 970
                           msg->pull_size, ts, msg->remote_event_size_bytes,
                           tmp_ptr, 0, NULL, lp);
               }
               else{
                   e = tw_event_new(msg->final_dest_gid, ts, lp);
                   m = tw_event_data(e);
                   memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
                   tw_event_send(e);
               }
971 972 973 974 975
	    }
       }
    }
  else
    {
976 977 978 979 980 981 982 983 984 985 986
      //e = tw_event_new(lp->gid, ts , lp);
      //m = tw_event_data( e );
      //memcpy(m, msg, torus_get_msg_sz() + msg->remote_event_size_bytes);
      void *m_data;
      e = model_net_method_event_new(lp->gid, ts, lp, TORUS, (void**)&m,
              &m_data);
      memcpy(m, msg, sizeof(nodes_message));
      if (msg->remote_event_size_bytes){
        memcpy(m_data, model_net_method_get_edata(TORUS, msg),
                msg->remote_event_size_bytes);
      }
987 988 989 990 991 992
      m->type = SEND;
      m->next_stop = -1;
      tw_event_send(e);
   }
}

993 994
/* reports torus statistics like average packet latency, maximum packet latency and average
 * number of torus hops traversed by the packet */
995 996
static void torus_report_stats()
{
997
    long long avg_hops, total_finished_packets;
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
    tw_stime avg_time, max_time;

    MPI_Reduce( &total_hops, &avg_hops, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
    MPI_Reduce( &N_finished_packets, &total_finished_packets, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
    MPI_Reduce( &total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
    MPI_Reduce( &max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);

    if(!g_tw_mynode)
     {
       printf(" Average number of hops traversed %f average message latency %lf us maximum message latency %lf us \n", (float)avg_hops/total_finished_packets, avg_time/(total_finished_packets*1000), max_time/1000);
     }
}
1010
/* finalize the torus node and free all event buffers available */
1011 1012 1013
void
final( nodes_state * s, tw_lp * lp )
{
1014
  model_net_print_stats(lp->gid, &s->torus_stats_array[0]); 
1015 1016 1017 1018 1019 1020
  free(s->next_link_available_time);
  free(s->next_credit_available_time);
  free(s->next_flit_generate_time);
  free(s->buffer); 
}

1021
/* increments the buffer count after a credit arrives from the remote compute node */
1022 1023 1024 1025
static void packet_buffer_process( nodes_state * s, tw_bf * bf, nodes_message * msg, tw_lp * lp )
{
   s->buffer[ msg->source_direction + ( msg->source_dim * 2 ) ][  0 ]--;
}
1026

1027
/* reverse handler for torus node */
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
static void node_rc_handler(nodes_state * s, tw_bf * bf, nodes_message * msg, tw_lp * lp)
{
  switch(msg->type)
    {
       case GENERATE:
		   {
		     s->packet_counter--;
		     int i;//, saved_dim, saved_dir;
	 	     //saved_dim = msg->saved_src_dim;
		     //saved_dir = msg->saved_src_dir;

		     //s->next_flit_generate_time[(saved_dim * 2) + saved_dir][0] = msg->saved_available_time;
		     for(i=0; i < num_chunks; i++)
1041 1042 1043 1044 1045 1046
  		        tw_rand_reverse_unif(lp->rng);
	     	     mn_stats* stat;
		     stat = model_net_find_stats(msg->category, s->torus_stats_array);
		     stat->send_count--; 
		     stat->send_bytes -= msg->packet_size;
		     stat->send_time -= (1/link_bandwidth) * msg->packet_size;
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
		   }
	break;
	
	case ARRIVAL:
		   {
  		    tw_rand_reverse_unif(lp->rng);
		    tw_rand_reverse_unif(lp->rng);
		    int next_dim = msg->source_dim;
		    int next_dir = msg->source_direction;

		    s->next_credit_available_time[next_dir + ( next_dim * 2 )][0] = msg->saved_available_time;
		    if(bf->c2)
		    {
1060 1061 1062 1063 1064
		       struct mn_stats* stat;
		       stat = model_net_find_stats(msg->category, s->torus_stats_array);
		       stat->recv_count--;
		       stat->recv_bytes -= msg->packet_size;
		        stat->recv_time -= tw_now(lp) - msg->travel_start_time;	    
1065 1066 1067 1068
		       N_finished_packets--;
		       total_time -= tw_now( lp ) - msg->travel_start_time;
		       total_hops -= msg->my_N_hop;
		    }
1069
 		    msg->my_N_hop--;
1070 1071 1072
                    if (lp->gid == msg->dest_lp && 
                            msg->chunk_id == num_chunks-1 &&
                            msg->remote_event_size_bytes && msg->is_pull){
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                        int net_id = model_net_get_id(LP_METHOD_NM);
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                        model_net_event_rc(net_id, lp, msg->pull_size);
                    }
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		   }
	break;	

	case SEND:
		 {
		    if(bf->c2)
		     {
                        int next_dim = msg->saved_src_dim;
			int next_dir = msg->saved_src_dir;
			s->next_link_available_time[next_dir + ( next_dim * 2 )][0] = msg->saved_available_time;
			s->buffer[ next_dir + ( next_dim * 2 ) ][ 0 ] --;
	                tw_rand_reverse_unif(lp->rng);
		    }
		 }
	break;

       case CREDIT:
		{
		  s->buffer[ msg->source_direction + ( msg->source_dim * 2 ) ][  0 ]++;
              }
       break;
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       case T_COLLECTIVE_INIT:
                {
                    s->collective_init_time = msg->saved_collective_init_time;
                }
        break;

        case T_COLLECTIVE_FAN_IN:
                {
                   int i;
                   s->num_fan_nodes--;
                   if(bf->c1)
                    {
                        s->num_fan_nodes = msg->saved_fan_nodes;
                    }
                   if(bf->c2)
                     {
                        s->num_fan_nodes = msg->saved_fan_nodes;
                        for( i = 0; i < s->num_children; i++ )
                            tw_rand_reverse_unif(lp->rng);
                     }
                }
        break;

        case T_COLLECTIVE_FAN_OUT:
                {
                 int i;
                 if(bf->c1)
                    {
                        for( i = 0; i < s->num_children; i++ )
                            tw_rand_reverse_unif(lp->rng);
                    }
                }
        break;      
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     }
}

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/* forward event handler for torus node event */
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static void event_handler(nodes_state * s, tw_bf * bf, nodes_message * msg, tw_lp * lp)
{
 *(int *) bf = (int) 0;
 switch(msg->type)
 {
  case GENERATE:
    packet_generate(s,bf,msg,lp);
  break;
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  case ARRIVAL:
    packet_arrive(s,bf,msg,lp);
  break;
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  case SEND:
   packet_send(s,bf,msg,lp);
  break;
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  case CREDIT:
    packet_buffer_process(s,bf,msg,lp);
   break;
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  case T_COLLECTIVE_INIT:
    node_collective_init(s, bf, msg, lp);
  break;

  case T_COLLECTIVE_FAN_IN:
    node_collective_fan_in(s, bf, msg, lp);
  break;

  case T_COLLECTIVE_FAN_OUT:
    node_collective_fan_out(s, bf, msg, lp);
  break;
 
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  default:
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	printf("\n Being sent to wrong LP %d", msg->type);
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  break;
 }
}
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/* event types */
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tw_lptype torus_lp =
{
  (init_f) torus_init,
  (event_f) event_handler,
  (revent_f) node_rc_handler,
  (final_f) final,
  (map_f) codes_mapping,
  sizeof(nodes_state),
};

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/* returns the torus lp type for lp registration */
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static const tw_lptype* torus_get_lp_type(void)
{
   return(&torus_lp); 
}

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static tw_lpid torus_find_local_device(tw_lp *sender)
{
     tw_lpid dest_id;

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     //TODO: be annotation-aware
     codes_mapping_get_lp_info(sender->gid, grp_name, &mapping_grp_id, NULL,
             &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
     codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1, mapping_rep_id,
             mapping_offset, &dest_id);
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    return(dest_id);
}

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/* data structure for torus statistics */
struct model_net_method torus_method =
{
   .mn_setup = torus_setup,
   .model_net_method_packet_event = torus_packet_event,
   .model_net_method_packet_event_rc = torus_packet_event_rc,
   .mn_get_lp_type = torus_get_lp_type,
   .mn_get_msg_sz = torus_get_msg_sz,
   .mn_report_stats = torus_report_stats,
   .model_net_method_find_local_device = torus_find_local_device,
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   .mn_collective_call = torus_collective,
   .mn_collective_call_rc = torus_collective_rc
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};
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/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */