dragonfly.c 51.1 KB
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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

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// Local router ID: 0 --- total_router-1
// Router LP ID 
// Terminal LP ID

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#include <ross.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/dragonfly.h"
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#define CHUNK_SIZE 32.0
#define CREDIT_SIZE 8
#define MEAN_PROCESS 1.0

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

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// debugging parameters
#define TRACK 235221
#define PRINT_ROUTER_TABLE 1
#define DEBUG 1

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

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// arrival rate
static double MEAN_INTERVAL=200.0;
/* radix of a dragonfly router = number of global channels + number of
 * compute node channels + number of local router channels */
static int radix=0;

/* configurable parameters, coming from the codes config file*/
/* number of virtual channels, number of routers comes from the
 * config file, number of compute nodes, global channels and group
 * is calculated from these configurable parameters */
static int num_vcs, num_routers, num_cn, num_global_channels, num_groups;

static int total_routers;

/* configurable parameters, global channel, local channel and 
 * compute node bandwidth */
static double global_bandwidth, local_bandwidth, cn_bandwidth;

/*configurable parameters, global virtual channel size, local
 * virtual channel size and compute node channel size */
static int global_vc_size, local_vc_size, cn_vc_size;

/* global variables for codes mapping */
static char lp_group_name[MAX_NAME_LENGTH], lp_type_name[MAX_NAME_LENGTH];
static int mapping_grp_id, mapping_type_id, mapping_rep_id, mapping_offset;

/* handles terminal and router events like packet generate/send/receive/buffer */
typedef enum event_t event_t;

typedef struct terminal_state terminal_state;
typedef struct router_state router_state;

/* dragonfly compute node data structure */
struct terminal_state
{
   unsigned long long packet_counter;

   // Dragonfly specific parameters
   unsigned int router_id;
   unsigned int terminal_id;

   // Each terminal will have an input and output channel with the router
   int* vc_occupancy; // NUM_VC
   int* output_vc_state;
   tw_stime terminal_available_time;
   tw_stime next_credit_available_time;
// Terminal generate, sends and arrival T_SEND, T_ARRIVAL, T_GENERATE
// Router-Router Intra-group sends and receives RR_LSEND, RR_LARRIVE
// Router-Router Inter-group sends and receives RR_GSEND, RR_GARRIVE
   struct mn_stats dragonfly_stats_array[CATEGORY_MAX];
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  /* 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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/* terminal event type (1-4) */
enum event_t
{
  T_GENERATE=1,
  T_ARRIVE,
  T_SEND,
  T_BUFFER,
  R_SEND,
  R_ARRIVE,
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  R_BUFFER,
  D_COLLECTIVE_INIT,
  D_COLLECTIVE_FAN_IN,
  D_COLLECTIVE_FAN_OUT
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};
/* status of a virtual channel can be idle, active, allocated or wait for credit */
enum vc_status
{
   VC_IDLE,
   VC_ACTIVE,
   VC_ALLOC,
   VC_CREDIT
};

/* whether the last hop of a packet was global, local or a terminal */
enum last_hop
{
   GLOBAL,
   LOCAL,
   TERMINAL
};

/* three forms of routing algorithms available, adaptive routing is not
 * accurate and fully functional in the current version as the formulas
 * for detecting load on global channels are not very accurate */
enum ROUTING_ALGO
{
   MINIMAL,
   NON_MINIMAL,
   ADAPTIVE
};

struct router_state
{
   unsigned int router_id;
   unsigned int group_id;
  
   int* global_channel; 
   tw_stime* next_output_available_time;
   tw_stime* next_credit_available_time;
   int* vc_occupancy;
   int* output_vc_state;
};

static short routing = MINIMAL;

static int head_delay;
static uint64_t num_chunks;

static tw_stime         dragonfly_total_time = 0;
static tw_stime         dragonfly_max_latency = 0;
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static tw_stime         max_collective = 0;
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static long long       total_hops = 0;
static long long       N_finished_packets = 0;

/* returns the dragonfly router lp type for lp registration */
static const tw_lptype* dragonfly_get_router_lp_type(void);

/* returns the dragonfly message size */
static int dragonfly_get_msg_sz(void)
{
	   return sizeof(terminal_message);
}


/* setup the dragonfly model, initialize global parameters */
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static void dragonfly_setup(const void* net_params)
{
   dragonfly_param* d_param = (dragonfly_param*)net_params;

   num_vcs = d_param->num_vcs;
   num_routers = d_param->num_routers;
   num_cn = num_routers/2;
   num_global_channels = num_routers/2;
   num_groups = num_routers * num_cn + 1; 

   global_bandwidth = d_param->global_bandwidth;
   local_bandwidth = d_param->local_bandwidth;
   cn_bandwidth = d_param->cn_bandwidth;

   global_vc_size = d_param->global_vc_size;
   local_vc_size = d_param->local_vc_size;
   cn_vc_size = d_param->cn_vc_size;
   routing = d_param->routing;

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   radix = num_vcs * (num_cn + num_global_channels + num_routers);
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   total_routers = num_groups * num_routers;
   lp_type_register("dragonfly_router", dragonfly_get_router_lp_type());
   return;
}

/* report dragonfly statistics like average and maximum packet latency, average number of hops traversed */
static void dragonfly_report_stats()
{
/* TODO: Add dragonfly packet average, maximum latency and average number of hops traversed */
   long long avg_hops, total_finished_packets;
   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( &dragonfly_total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &dragonfly_max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);

   /* print statistics */
   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);
   }
   return;
}
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void dragonfly_collective_init(terminal_state * s,
           		   tw_lp * lp)
{
    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
    int num_lps = codes_mapping_get_lp_count(lp_group_name, LP_CONFIG_NM);
    int num_reps = codes_mapping_get_group_reps(lp_group_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 DRAGONFLY_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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/* dragonfly packet event , generates a dragonfly packet on the compute node */
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static tw_stime dragonfly_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;
    terminal_message * msg;
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    tw_lpid dest_nic_id;
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    char* tmp_ptr;
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#if 0
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    char lp_type_name[MAX_NAME_LENGTH], lp_group_name[MAX_NAME_LENGTH];

    int mapping_grp_id, mapping_rep_id, mapping_type_id, mapping_offset;
    codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
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    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, mapping_rep_id, mapping_offset, &local_nic_id);
#endif
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    codes_mapping_get_lp_info(final_dest_lp, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
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    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, mapping_rep_id, mapping_offset, &dest_nic_id);
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    xfer_to_nic_time = 0.01 + codes_local_latency(sender); /* Throws an error of found last KP time > current event time otherwise when LPs of one type are placed together*/
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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, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);
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    strcpy(msg->category, category);
    msg->final_dest_gid = final_dest_lp;
    msg->dest_terminal_id = dest_nic_id;
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    msg->sender_lp=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 = T_GENERATE;
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    msg->is_pull = is_pull;
    msg->pull_size = pull_size;
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    if(is_last_pckt) /* Its the last packet so pass in remote and local 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 dragonfly 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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}

/* dragonfly packet event reverse handler */
static void dragonfly_packet_event_rc(tw_lp *sender)
{
	  codes_local_latency_reverse(sender);
	    return;
}

/* given a group ID gid, find the router in the current group that is attached
 * to a router in the group gid */
tw_lpid getRouterFromGroupID(int gid, 
		    router_state * r)
{
  int group_begin = r->group_id * num_routers;
  int group_end = (r->group_id * num_routers) + num_routers-1;
  int offset = (gid * num_routers - group_begin) / num_routers;
  
  if((gid * num_routers) < group_begin)
    offset = (group_begin - gid * num_routers) / num_routers; // take absolute value
  
  int half_channel = num_global_channels / 2;
  int index = (offset - 1)/(half_channel * num_routers);
  
  offset=(offset - 1) % (half_channel * num_routers);

  // If the destination router is in the same group
  tw_lpid router_id;

  if(index % 2 != 0)
    router_id = group_end - (offset / half_channel); // start from the end
  else
    router_id = group_begin + (offset / half_channel);

  return router_id;
}	

/*When a packet is sent from the current router and a buffer slot becomes available, a credit is sent back to schedule another packet event*/
void router_credit_send(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_event * buf_e;
  tw_stime ts;
  terminal_message * buf_msg;

  int dest=0, credit_delay=0, type = R_BUFFER;
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  int is_terminal = 0;
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 // Notify sender terminal about available buffer space
  if(msg->last_hop == TERMINAL)
  {
   dest = msg->src_terminal_id;
   //determine the time in ns to transfer the credit
   credit_delay = (1 / cn_bandwidth) * CREDIT_SIZE;
   type = T_BUFFER;
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   is_terminal = 1;
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  }
   else if(msg->last_hop == GLOBAL)
   {
     dest = msg->intm_lp_id;
     credit_delay = (1 / global_bandwidth) * CREDIT_SIZE;
   }
    else if(msg->last_hop == LOCAL)
     {
        dest = msg->intm_lp_id;
     	credit_delay = (1/local_bandwidth) * CREDIT_SIZE;
     }
    else
      printf("\n Invalid message type");

   // Assume it takes 0.1 ns of serialization latency for processing the credits in the queue
    int output_port = msg->saved_vc / num_vcs;
    msg->saved_available_time = s->next_credit_available_time[output_port];
    s->next_credit_available_time[output_port] = max(tw_now(lp), s->next_credit_available_time[output_port]);
    ts = credit_delay + tw_rand_exponential(lp->rng, (double)credit_delay/1000);
	
    s->next_credit_available_time[output_port]+=ts;
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    if (is_terminal){
        buf_e = model_net_method_event_new(dest, 
                s->next_credit_available_time[output_port] - tw_now(lp), lp,
                DRAGONFLY, (void**)&buf_msg, NULL);
    }
    else{
        buf_e = tw_event_new(dest, s->next_credit_available_time[output_port] - tw_now(lp) , lp);
        buf_msg = tw_event_data(buf_e);
    }
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    buf_msg->vc_index = msg->saved_vc;
    buf_msg->type=type;
    buf_msg->last_hop = msg->last_hop;
    buf_msg->packet_ID=msg->packet_ID;

    tw_event_send(buf_e);

    return;
}

/* generates packet at the current dragonfly compute node */
void packet_generate(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_stime ts;
  tw_event *e;
  terminal_message *m;
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  int i, total_event_size;
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  num_chunks = msg->packet_size / CHUNK_SIZE;
  msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter + tw_rand_integer(lp->rng, 0, lp->gid + g_tw_nlp * s->packet_counter);
  msg->travel_start_time = tw_now(lp);
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  msg->my_N_hop = 0;
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  for(i = 0; i < num_chunks; i++)
  {
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	  // Before
	  // msg->my_N_hop = 0; generating a packet, check if the input queue is available
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        ts = i + tw_rand_exponential(lp->rng, MEAN_INTERVAL/200);
	int chan = -1, j;
	for(j = 0; j < num_vcs; j++)
	 {
	     if(s->vc_occupancy[j] < cn_vc_size * num_chunks)
	      {
	       chan=j;
	       break;
	      }
         }

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        // this is a terminal event, so use the method-event version
       //e = tw_event_new(lp->gid, i + ts, lp);
       //m = tw_event_data(e);
       //memcpy(m, msg, sizeof(terminal_message) + msg->remote_event_size_bytes + msg->local_event_size_bytes);
       void * m_data;
       e = model_net_method_event_new(lp->gid, i+ts, lp, DRAGONFLY,
               (void**)&m, &m_data);
       memcpy(m, msg, sizeof(terminal_message));
       void * m_data_src = model_net_method_get_edata(DRAGONFLY, msg);
       if (msg->remote_event_size_bytes){
            memcpy(m_data, m_data_src, msg->remote_event_size_bytes);
       }
       if (msg->local_event_size_bytes){ 
            memcpy((char*)m_data + msg->remote_event_size_bytes,
                    (char*)m_data_src + msg->remote_event_size_bytes,
                    msg->local_event_size_bytes);
       }
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       m->intm_group_id = -1;
       m->saved_vc=0;
       m->chunk_id = i;
       
       if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
         printf("\n packet generated %lld at terminal %d chunk id %d ", msg->packet_ID, (int)lp->gid, i);
       
       m->output_chan = -1;
       if(chan != -1) // If the input queue is available
   	{
	    // Send the packet out
	     m->type = T_SEND;
 	     tw_event_send(e);
        }
      else
         {
	  printf("\n Exceeded queue size, exitting %d", s->vc_occupancy[0]);
	  MPI_Finalize();
	  exit(-1);
        } //else
  } // for
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  total_event_size = model_net_get_msg_sz(DRAGONFLY) + 
      msg->remote_event_size_bytes + msg->local_event_size_bytes;
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  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
  stat->send_count++;
  stat->send_bytes += msg->packet_size;
  stat->send_time += (1/cn_bandwidth) * msg->packet_size;
  if(stat->max_event_size < total_event_size)
	  stat->max_event_size = total_event_size;
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  return;
}

/* sends the packet from the current dragonfly compute node to the attached router */
void packet_send(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_stime ts;
  tw_event *e;
  terminal_message *m;
  tw_lpid router_id;
  /* Route the packet to its source router */ 
   int vc=msg->saved_vc;

   //  Each packet is broken into chunks and then sent over the channel
   msg->saved_available_time = s->terminal_available_time;
   head_delay = (1/cn_bandwidth) * CHUNK_SIZE;
   ts = head_delay + tw_rand_exponential(lp->rng, (double)head_delay/200);
   s->terminal_available_time = max(s->terminal_available_time, tw_now(lp));
   s->terminal_available_time += ts;

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   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
   codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", s->router_id, 0, &router_id);
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   // we are sending an event to the router, so no method_event here
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   e = tw_event_new(router_id, s->terminal_available_time - tw_now(lp), lp);

   if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
     printf("\n terminal %d packet %lld chunk %d being sent to router %d router id %d ", (int)lp->gid, (long long)msg->packet_ID, msg->chunk_id, (int)router_id, s->router_id);
   m = tw_event_data(e);
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   memcpy(m, msg, sizeof(terminal_message));
   if (msg->remote_event_size_bytes){
        memcpy(m+1, model_net_method_get_edata(DRAGONFLY, msg),
                msg->remote_event_size_bytes);
   }
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   m->type = R_ARRIVE;
   m->src_terminal_id = lp->gid;
   m->saved_vc = vc;
   m->last_hop = TERMINAL;
   m->intm_group_id = -1;
   m->local_event_size_bytes = 0;
   tw_event_send(e);
//  Each chunk is 32B and the VC occupancy is in chunks to enable efficient flow control

   if(msg->chunk_id == num_chunks - 1) 
    {
      /* local completion message */
      if(msg->local_event_size_bytes > 0)
	 {
           tw_event* e_new;
	   terminal_message* m_new;
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	   void* local_event = 
               (char*)model_net_method_get_edata(DRAGONFLY, msg) + 
               msg->remote_event_size_bytes;
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	   ts = (1/cn_bandwidth) * msg->local_event_size_bytes;
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	   e_new = tw_event_new(msg->sender_lp, ts, lp);
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	   m_new = tw_event_data(e_new);
	   memcpy(m_new, local_event, msg->local_event_size_bytes);
	   tw_event_send(e_new);
	}
    }
   
   s->packet_counter++;
   s->vc_occupancy[vc]++;

   if(s->vc_occupancy[vc] >= (cn_vc_size * num_chunks))
      s->output_vc_state[vc] = VC_CREDIT;
   return;
}

/* packet arrives at the destination terminal */
void packet_arrive(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
#if DEBUG
if( msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
    {
	printf( "(%lf) [Terminal %d] packet %lld has arrived  \n",
              tw_now(lp), (int)lp->gid, msg->packet_ID);

	printf("travel start time is %f\n",
                msg->travel_start_time);

	printf("My hop now is %d\n",msg->my_N_hop);
    }
#endif

  // Packet arrives and accumulate # queued
  // Find a queue with an empty buffer slot
   tw_event * e, * buf_e;
   terminal_message * m, * buf_msg;
   tw_stime ts;
   bf->c3 = 0;
   bf->c2 = 0;

   msg->my_N_hop++;
  if(msg->chunk_id == num_chunks-1)
  {
	 bf->c2 = 1;
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	 mn_stats* stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
	 stat->recv_count++;
	 stat->recv_bytes += msg->packet_size;
	 stat->recv_time += tw_now(lp) - msg->travel_start_time;

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	 N_finished_packets++;
	 dragonfly_total_time += tw_now( lp ) - msg->travel_start_time;
	 total_hops += msg->my_N_hop;

	 if (dragonfly_max_latency < tw_now( lp ) - msg->travel_start_time) 
	 {
		bf->c3 = 1;
		msg->saved_available_time = dragonfly_max_latency;
		dragonfly_max_latency=tw_now( lp ) - msg->travel_start_time;
	 }
	// Trigger an event on receiving server
	if(msg->remote_event_size_bytes)
	{
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            void * tmp_ptr = model_net_method_get_edata(DRAGONFLY, msg);
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            ts = (1/cn_bandwidth) * msg->remote_event_size_bytes;
            if (msg->is_pull){
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                int net_id = model_net_get_id(LP_METHOD_NM);
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                model_net_event(net_id, msg->category, msg->sender_lp,
                        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); 
            }
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	}
  }

  int credit_delay = (1 / cn_bandwidth) * CREDIT_SIZE;
  ts = credit_delay + tw_rand_exponential(lp->rng, credit_delay/1000);
  
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  msg->saved_credit_time = s->next_credit_available_time;
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  s->next_credit_available_time = max(s->next_credit_available_time, tw_now(lp));
  s->next_credit_available_time += ts;

  tw_lpid router_dest_id;
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  codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", s->router_id, 0, &router_dest_id);
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  // no method_event here - message going to router
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  buf_e = tw_event_new(router_dest_id, s->next_credit_available_time - tw_now(lp), lp);
  buf_msg = tw_event_data(buf_e);
  buf_msg->vc_index = msg->saved_vc;
  buf_msg->type=R_BUFFER;
  buf_msg->packet_ID=msg->packet_ID;
  buf_msg->last_hop = TERMINAL;
  tw_event_send(buf_e);

  return;
}

/* initialize a dragonfly compute node terminal */
void 
terminal_init( terminal_state * s, 
	       tw_lp * lp )
{
    int i;
    // Assign the global router ID
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
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   int num_lps = codes_mapping_get_lp_count(lp_group_name, LP_CONFIG_NM);
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   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;  
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   s->router_id=(int)s->terminal_id / num_routers;
   s->terminal_available_time = 0.0;
   s->packet_counter = 0;

   s->vc_occupancy = (int*)malloc(num_vcs * sizeof(int));
   s->output_vc_state = (int*)malloc(num_vcs * sizeof(int));

   for( i = 0; i < num_vcs; i++ )
    {
      s->vc_occupancy[i]=0;
      s->output_vc_state[i]=VC_IDLE;
    }
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   dragonfly_collective_init(s, lp);
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   return;
}

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/* collective operation for the torus network */
void dragonfly_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;
    terminal_message * msg;
    tw_lpid local_nic_id;
    char* tmp_ptr;

    codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, mapping_rep_id, mapping_offset, &local_nic_id);

    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, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);

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

    tmp_ptr = (char*)msg;
    tmp_ptr += dragonfly_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 dragonfly_collective_rc(int message_size, tw_lp* sender)
{
     codes_local_latency_reverse(sender);
     return;
}

static void send_remote_event(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
    // Trigger an event on receiving server
    if(msg->remote_event_size_bytes)
     {
            tw_event* e;
            tw_stime ts;
            terminal_message * m;
            ts = (1/cn_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 += dragonfly_get_msg_sz();
            memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
            tw_event_send(e);
     }
}

static void node_collective_init(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        tw_event * e_new;
        tw_lpid parent_nic_id;
        tw_stime xfer_to_nic_time;
        terminal_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 */
            codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
            num_lps = codes_mapping_get_lp_count(lp_group_name, LP_CONFIG_NM);
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->parent_node_id/num_lps , (s->parent_node_id % num_lps), &parent_nic_id);

           /* 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, DRAGONFLY, (void**)&msg_new, (void**)&m_data);
	    	
            memcpy(msg_new, msg, sizeof(terminal_message));
	    if (msg->remote_event_size_bytes){
        	memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
                	msg->remote_event_size_bytes);
      	    }
	    
            msg_new->type = D_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            tw_event_send(e_new);
        }
        return;
}

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

        codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
        int num_lps = codes_mapping_get_lp_count(lp_group_name, LP_CONFIG_NM);

        tw_event* e_new;
        terminal_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 */
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->parent_node_id/num_lps , (s->parent_node_id % num_lps), &parent_nic_id);

           /* 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, DRAGONFLY, (void**)&msg_new, &m_data);
	    
            memcpy(msg_new, msg, sizeof(terminal_message));
            msg_new->type = D_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            if (msg->remote_event_size_bytes){
	        memcpy(m_data, model_net_method_get_edata(DRAGONFLY, 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 */
                codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->children[i]/num_lps , (s->children[i] % num_lps), &child_nic_id);
                //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, DRAGONFLY, (void**)&msg_new, &m_data);

		memcpy(msg_new, msg, sizeof(terminal_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 = D_COLLECTIVE_FAN_OUT;
                msg_new->sender_node = s->node_id;

                tw_event_send(e_new);
           }
      }
}

static void node_collective_fan_out(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        int i;
        int num_lps = codes_mapping_get_lp_count(lp_group_name, LP_CONFIG_NM);
        bf->c1 = 0;
        bf->c2 = 0;

        send_remote_event(s, bf, msg, lp);

        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 + DRAGONFLY_FAN_OUT_DELAY + tw_rand_exponential(lp->rng, (double)DRAGONFLY_FAN_OUT_DELAY/10);

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

                        /* get global LP ID of the child node */
                        codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->children[i]/num_lps , (s->children[i] % num_lps), &child_nic_id);
                        //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, DRAGONFLY, (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(DRAGONFLY, msg),
			                msg->remote_event_size_bytes);
      			}


                        msg_new->type = D_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;
          }
}
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/* update the compute node-router channel buffer */
void 
terminal_buf_update(terminal_state * s, 
		    tw_bf * bf, 
		    terminal_message * msg, 
		    tw_lp * lp)
{
  // Update the buffer space associated with this router LP 
    int msg_indx = msg->vc_index;
    
    s->vc_occupancy[msg_indx]--;
    s->output_vc_state[msg_indx] = VC_IDLE;

    return;
}

void 
terminal_event( terminal_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp )
{
  *(int *)bf = (int)0;
  switch(msg->type)
    {
    case T_GENERATE:
       packet_generate(s,bf,msg,lp);
    break;
    
    case T_ARRIVE:
        packet_arrive(s,bf,msg,lp);
    break;
    
    case T_SEND:
      packet_send(s,bf,msg,lp);
    break;
    
    case T_BUFFER:
       terminal_buf_update(s, bf, msg, lp);
     break;
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    case D_COLLECTIVE_INIT:
      node_collective_init(s, bf, msg, lp);
    break;
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    case D_COLLECTIVE_FAN_IN:
      node_collective_fan_in(s, bf, msg, lp);
    break;

    case D_COLLECTIVE_FAN_OUT:
      node_collective_fan_out(s, bf, msg, lp);
    break;
    
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    default:
       printf("\n LP %d Terminal message type not supported %d ", (int)lp->gid, msg->type);
    }
}

void 
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dragonfly_terminal_final( terminal_state * s, 
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      tw_lp * lp )
{
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	model_net_print_stats(lp->gid, s->dragonfly_stats_array);
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}

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void dragonfly_router_final(router_state * s,
		tw_lp * lp)
{
   free(s->global_channel);
}
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/* get the next stop for the current packet
 * determines if it is a router within a group, a router in another group
 * or the destination terminal */
tw_lpid 
get_next_stop(router_state * s, 
		      tw_bf * bf, 
		      terminal_message * msg, 
		      tw_lp * lp, 
		      int path)
{
   int dest_lp;
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   tw_lpid router_dest_id = -1;
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   int i;
   int dest_group_id;

   codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset); 
1030
   int num_lps = codes_mapping_get_lp_count(lp_group_name, LP_CONFIG_NM);
1031
   int dest_router_id = (mapping_offset + (mapping_rep_id * num_lps)) / num_routers;
1032
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1034
1035
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1037
   
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
   int local_router_id = (mapping_offset + mapping_rep_id);

   bf->c2 = 0;

1038
  /* If the packet has arrived at the destination router */
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   if(dest_router_id == local_router_id)
    {
        dest_lp = msg->dest_terminal_id;

        return dest_lp;
    }
1045
   /* Generate inter-mediate destination for non-minimal routing (selecting a random group) */
1046
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   if(msg->last_hop == TERMINAL && path == NON_MINIMAL)
    {
      if(dest_router_id / num_routers != s->group_id)
         {
            bf->c2 = 1;
            int intm_grp_id = tw_rand_integer(lp->rng, 0, num_groups-1);
            msg->intm_group_id = intm_grp_id;
          }    
    }
1055
  /* It means that the packet has arrived at the inter-mediate group for non-minimal routing. Reset the group now. */
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   if(msg->intm_group_id == s->group_id)
   {  
           msg->intm_group_id = -1;//no inter-mediate group
   } 
1060
  /* Intermediate group ID is set. Divert the packet to an intermediate group. */
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  if(msg->intm_group_id >= 0)
   {
      dest_group_id = msg->intm_group_id;
   }
1065
  else /* direct the packet to the destination group */
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   {
     dest_group_id = dest_router_id / num_routers;
   }
  
1070
  /* It means the packet has arrived at the destination group. Now divert it to the destination router. */
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  if(s->group_id == dest_group_id)
   {
     dest_lp = dest_router_id;
   }
   else
   {
1077
      /* Packet is at the source or intermediate group. Find a router that has a path to the destination group. */
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      dest_lp=getRouterFromGroupID(dest_group_id,s);
  
      if(dest_lp == local_router_id)
      {
        for(i=0; i < num_global_channels; i++)
           {
            if(s->global_channel[i] / num_routers == dest_group_id)
                dest_lp=s->global_channel[i];
          }
      }
   }
1089
  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", dest_lp, 0, &router_dest_id);
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  return router_dest_id;
}

/* gets the output port corresponding to the next stop of the message */
int 
get_output_port( router_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp, 
		int next_stop )
{
  int output_port = -1, i, terminal_id;
  codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
1103
  int num_lps = codes_mapping_get_lp_count(lp_group_name,LP_CONFIG_NM);
1104
  terminal_id = (mapping_rep_id * num_lps) + mapping_offset;
1105
1106
1107
1108

  if(next_stop == msg->dest_terminal_id)
   {
      output_port = num_routers + num_global_channels + ( terminal_id % num_cn);
1109
1110
      //if(output_port > 6)
	//      printf("\n incorrect output port %d terminal id %d ", output_port, terminal_id);
1111
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1120
1121
    }
    else
    {
     codes_mapping_get_lp_info(next_stop, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
     int local_router_id = mapping_rep_id + mapping_offset;
     int intm_grp_id = local_router_id / num_routers;

     if(intm_grp_id != s->group_id)
      {
        for(i=0; i < num_global_channels; i++)
         {
1122
           if(s->global_channel[i] == local_router_id)
1123
1124
1125
1126
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1129
             output_port = num_routers + i;
          }
      }
      else
       {
        output_port = local_router_id % num_routers;
       }
1130
//	      printf("\n output port not found %d next stop %d local router id %d group id %d intm grp id %d %d", output_port, next_stop, local_router_id, s->group_id, intm_grp_id, local_router_id%num_routers);
1131
1132
1133
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1137
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1142
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1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
    }
    return output_port;
}

/* routes the current packet to the next stop */
void 
router_packet_send( router_state * s, 
		    tw_bf * bf, 
		     terminal_message * msg, tw_lp * lp)
{
   tw_stime ts;
   tw_event *e;
   terminal_message *m;

   int next_stop = -1, output_port = -1, output_chan = -1;
   float bandwidth = local_bandwidth;
   int path = routing;

   bf->c3 = 0;

   next_stop = get_next_stop(s, bf, msg, lp, path);
   output_port = get_output_port(s, bf, msg, lp, next_stop); 
   output_chan = output_port * num_vcs;

   // Even numbered channels for minimal routing
   // Odd numbered channels for nonminimal routing
   int global=0;
   int buf_size = local_vc_size;

1160
1161
   assert(output_port != -1);
   assert(output_chan != -1);
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
   // Allocate output Virtual Channel
  if(output_port >= num_routers && output_port < num_routers + num_global_channels)
  {
	 bandwidth = global_bandwidth;
	 global = 1;
	 buf_size = global_vc_size;
  }

  if(output_port >= num_routers + num_global_channels)
	buf_size = cn_vc_size;

   if(s->vc_occupancy[output_chan] >= buf_size)
    {
1175
	    printf("\n %lf Router %ld buffers overflowed from incoming terminals channel %d occupancy %d radix %d next_stop %d ", tw_now(lp),(long int) lp->gid, output_chan, s->vc_occupancy[output_chan], radix, next_stop);
1176
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1182
1183
1184
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1189
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1191
1192
1193
1194
	    bf->c3 = 1;
	    MPI_Finalize();
	    exit(-1);
    }

#if DEBUG
if( msg->packet_ID == TRACK && next_stop != msg->dest_terminal_id && msg->chunk_id == num_chunks-1)
  {
   printf("\n (%lf) [Router %d] Packet %lld being sent to intermediate group router %d Final destination terminal %d Output Channel Index %d Saved vc %d msg_intm_id %d \n", 
              tw_now(lp), (int)lp->gid, msg->packet_ID, next_stop, 
	      msg->dest_terminal_id, output_chan, msg->saved_vc, msg->intm_group_id);
  }
#endif
 // If source router doesn't have global channel and buffer space is available, then assign to appropriate intra-group virtual channel 
  msg->saved_available_time = s->next_output_available_time[output_port];
  ts = ((1/bandwidth) * CHUNK_SIZE) + tw_rand_exponential(lp->rng, (double)CHUNK_SIZE/200);

  s->next_output_available_time[output_port] = max(s->next_output_available_time[output_port], tw_now(lp));
  s->next_output_available_time[output_port] += ts;
1195
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1206
1207
1208
1209
1210
  // dest can be a router or a terminal, so we must check
  void * m_data;
  if (next_stop == msg->dest_terminal_id){
      e = model_net_method_event_new(next_stop, 
              s->next_output_available_time[output_port] - tw_now(lp), lp,
              DRAGONFLY, (void**)&m, &m_data);
  }
  else{
      e = tw_event_new(next_stop, s->next_output_available_time[output_port] - tw_now(lp), lp);
      m = tw_event_data(e);
      m_data = m+1;
  }
  memcpy(m, msg, sizeof(terminal_message));
  if (msg->remote_event_size_bytes){
      memcpy(m_data, msg+1, msg->remote_event_size_bytes);
  }
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221

  if(global)
    m->last_hop=GLOBAL;
  else
    m->last_hop = LOCAL;

  m->saved_vc = output_chan;
  msg->old_vc = output_chan;
  m->intm_lp_id = lp->gid;
  s->vc_occupancy[output_chan]++;

1222
1223
  /* Determine the event type. If the packet has arrived at the final destination
     router then it should arrive at the destination terminal next. */
1224
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1226
1227
1228
1229
1230
1231
1232
  if(next_stop == msg->dest_terminal_id)
  {
    m->type = T_ARRIVE;

    if(s->vc_occupancy[output_chan] >= cn_vc_size * num_chunks)
      s->output_vc_state[output_chan] = VC_CREDIT;
  }
  else
  {
1233
    /* The packet has to be sent to another router */
1234
1235
    m->type = R_ARRIVE;

1236
   /* If this is a global channel then the buffer space is different */
1237
1238
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1240
1241
1242
1243
   if( global )
   {
     if(s->vc_occupancy[output_chan] >= global_vc_size * num_chunks )
       s->output_vc_state[output_chan] = VC_CREDIT;
   }
  else
    {
1244
     /* buffer space is less for local channels */
1245
1246
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1249
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1270
     if( s->vc_occupancy[output_chan] >= local_vc_size * num_chunks )
	s->output_vc_state[output_chan] = VC_CREDIT;
    }
  }
  tw_event_send(e);
  return;
}

/* Packet arrives at the router and a credit is sent back to the sending terminal/router */
void 
router_packet_receive( router_state * s, 
			tw_bf * bf, 
			terminal_message * msg, 
			tw_lp * lp )
{
    tw_event *e;
    terminal_message *m;
    tw_stime ts;

    msg->my_N_hop++;
    ts = 0.1 + tw_rand_exponential(lp->rng, (double)MEAN_INTERVAL/200);
    num_chunks = msg->packet_size/CHUNK_SIZE;

    if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
       printf("\n packet %lld chunk %d received at router %d ", msg->packet_ID, msg->chunk_id, (int)lp->gid);
   
1271
    // router self message - no need for method_event
1272
1273
    e = tw_event_new(lp->gid, ts, lp);
    m = tw_event_data(e);
1274
    memcpy(m, msg, sizeof(terminal_message) + msg->remote_event_size_bytes);
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
    m->type = R_SEND;
    router_credit_send(s, bf, msg, lp);
    tw_event_send(e);  
    return;
}

/* sets up the router virtual channels, global channels, local channels, compute node channels */
void router_setup(router_state * r, tw_lp * lp)
{
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
   r->router_id=mapping_rep_id + mapping_offset;
   r->group_id=r->router_id/num_routers;

   int i;
1289
   int router_offset=(r->router_id % num_routers) * (num_global_channels / 2) + 1;
1290
1291
1292
1293
1294
1295

   r->global_channel = (int*)malloc(num_global_channels * sizeof(int));
   r->next_output_available_time = (tw_stime*)malloc(radix * sizeof(tw_stime));
   r->next_credit_available_time = (tw_stime*)malloc(radix * sizeof(tw_stime));
   r->vc_occupancy = (int*)malloc(radix * sizeof(int));
   r->output_vc_state = (int*)malloc(radix * sizeof(int));
1296
  
1297
1298
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1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
   for(i=0; i < radix; i++)
    {
       // Set credit & router occupancy
	r->next_output_available_time[i]=0;
        r->next_credit_available_time[i]=0;
        r->vc_occupancy[i]=0;
        r->output_vc_state[i]= VC_IDLE;
    }

   //round the number of global channels to the nearest even number
   for(i=0; i < num_global_channels; i++)
    {
      if(i % 2 != 0)
          {
1311
1312
             r->global_channel[i]=(r->router_id + (router_offset * num_routers))%total_routers;
             router_offset++;
1313
1314
1315
          }
          else
           {
1316
             r->global_channel[i]=r->router_id - ((router_offset) * num_routers);
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
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1337
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1345
1346
1347
1348
1349
1350
1351
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1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
           }
        if(r->global_channel[i]<0)
         {
           r->global_channel[i]=total_routers+r->global_channel[i]; 
	 }
    }
   return;
}	

/* Update the buffer space associated with this router LP */
void router_buf_update(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
    int msg_indx = msg->vc_index;
    s->vc_occupancy[msg_indx]--;
    s->output_vc_state[msg_indx] = VC_IDLE;
    return;
}

void router_event(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  *(int *)bf = (int)0;
  switch(msg->type)
   {
	   case R_SEND: // Router has sent a packet to an intra-group router (local channel)
 		 router_packet_send(s, bf, msg, lp);
           break;

	   case R_ARRIVE: // Router has received a packet from an intra-group router (local channel)
	        router_packet_receive(s, bf, msg, lp);
	   break;
	
	   case R_BUFFER:
	        router_buf_update(s, bf, msg, lp);
	   break;

	   default:
		  printf("\n (%lf) [Router %d] Router Message type not supported %d dest terminal id %d packet ID %d ", tw_now(lp), (int)lp->gid, msg->type, (int)msg->dest_terminal_id, (int)msg->packet_ID);
	   break;
   }	   
}

/* Reverse computation handler for a terminal event */
void terminal_rc_event_handler(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
   switch(msg->type)
   {
	   case T_GENERATE:
		 {
		 int i;
		 tw_rand_reverse_unif(lp->rng);

		 for(i = 0; i < num_chunks; i++)
                  tw_rand_reverse_unif(lp->rng);
1370
1371
1372
1373
1374
		 mn_stats* stat;
		 stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
		 stat->send_count--;
		 stat->send_bytes -= msg->packet_size;
		 stat->send_time -= (1/cn_bandwidth) * msg->packet_size;
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
		 }
	   break;
	   
	   case T_SEND:
	         {
	           s->terminal_available_time = msg->saved_available_time;
		   tw_rand_reverse_unif(lp->rng);	
		   int vc = msg->saved_vc;
		   s->vc_occupancy[vc]--;
		   s->packet_counter--;
		   s->output_vc_state[vc] = VC_IDLE;
		 }
	   break;

	   case T_ARRIVE:
	   	 {
		   tw_rand_reverse_unif(lp->rng);
1392
		   s->next_credit_available_time = msg->saved_credit_time;
1393
1394
		   if(bf->c2)
		   {
1395
1396
1397
1398
1399
		    mn_stats* stat;
		    stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
		    stat->recv_count--;
		    stat->recv_bytes -= msg->packet_size;
		    stat->recv_time -= tw_now(lp) - msg->travel_start_time;
1400
1401
1402
1403
1404
		    N_finished_packets--;
		    dragonfly_total_time -= (tw_now(lp) - msg->travel_start_time);
		    total_hops -= msg->my_N_hop;
		   if(bf->c3)
		         dragonfly_max_latency = msg->saved_available_time;
1405
1406
1407
		   }
		    
		   msg->my_N_hop--;
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
		 }
           break;

	   case T_BUFFER:
	        {
		   int msg_indx = msg->vc_index;
		   s->vc_occupancy[msg_indx]++;
		   
		   if(s->vc_occupancy[msg_indx] == cn_vc_size * num_chunks)
			s->output_vc_state[msg_indx] = VC_CREDIT;
	     }  
	   break;
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
	
          case D_COLLECTIVE_INIT:
                {
                    s->collective_init_time = msg->saved_collective_init_time;
                }
          break;

          case D_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 D_COLLECTIVE_FAN_OUT:
                {
                 int i;
                 if(bf->c1)
                    {
                        for( i = 0; i < s->num_children; i++ )
                            tw_rand_reverse_unif(lp->rng);
                    }
                }	 
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
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1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
   }
}

/* Reverse computation handler for a router event */
void router_rc_event_handler(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  switch(msg->type)
    {
            case R_SEND:
		    {
		        tw_rand_reverse_unif(lp->rng);

			if(bf->c3)
			   return;
			    
			int output_chan = msg->old_vc;
			int output_port = output_chan / num_vcs;

			s->next_output_available_time[output_port] = msg->saved_available_time;
			s->vc_occupancy[output_chan]--;
			s->output_vc_state[output_chan]=VC_IDLE;
		
			if(bf->c2)
			   tw_rand_reverse_unif(lp->rng);
		    }
	    break;

	    case R_ARRIVE:
	    	    {
			msg->my_N_hop--;
			tw_rand_reverse_unif(lp->rng);
			tw_rand_reverse_unif(lp->rng);
			int output_port = msg->saved_vc/num_vcs;
			s->next_credit_available_time[output_port] = msg->saved_available_time;
1487
1488
1489
                        if (msg->chunk_id == num_chunks-1 && 
                                msg->remote_event_size_bytes && 
                                msg->is_pull){
1490
                            int net_id = model_net_get_id(LP_METHOD_NM);
1491
1492
                            model_net_event_rc(net_id, lp, msg->pull_size);
                        }
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
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1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
		    }
	    break;

	    case R_BUFFER:
	    	   {
		      int msg_indx = msg->vc_index;
                      s->vc_occupancy[msg_indx]++;

                      int buf = local_vc_size;

		      if(msg->last_hop == GLOBAL)
			 buf = global_vc_size;
		       else if(msg->last_hop == TERMINAL)
			 buf = cn_vc_size;
	 
		      if(s->vc_occupancy[msg_indx] >= buf * num_chunks)
                          s->output_vc_state[msg_indx] = VC_CREDIT;

		   }
	    break;
	  
    }
}
/* dragonfly compute node and router LP types */
tw_lptype dragonfly_lps[] =
{
   // Terminal handling functions
   {
    (init_f)terminal_init,
    (event_f) terminal_event,
    (revent_f) terminal_rc_event_handler,
1524
    (final_f) dragonfly_terminal_final,
1525
1526
1527
1528
1529
1530
1531
    (map_f) codes_mapping,
    sizeof(terminal_state)
    },
   {
     (init_f) router_setup,
     (event_f) router_event,
     (revent_f) router_rc_event_handler,
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     (final_f) dragonfly_router_final,
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     (map_f) codes_mapping,
     sizeof(router_state),
   },
   {0},
};

/* returns the dragonfly lp type for lp registration */
static const tw_lptype* dragonfly_get_cn_lp_type(void)
{
	   return(&dragonfly_lps[0]);
}
static const tw_lptype* dragonfly_get_router_lp_type(void)
{
	           return(&dragonfly_lps[1]);
}          

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static tw_lpid dragonfly_find_local_device(tw_lp *sender)
{
     char lp_type_name[MAX_NAME_LENGTH], lp_group_name[MAX_NAME_LENGTH];
     int mapping_grp_id, mapping_rep_id, mapping_type_id, mapping_offset;
     tw_lpid dest_id;

     codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id, &mapping_type_id, lp_type_name, &mapping_rep_id, &mapping_offset);
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     codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, mapping_rep_id, mapping_offset, &dest_id);
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    return(dest_id);
}
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/* data structure for dragonfly statistics */
struct model_net_method dragonfly_method =
{
    .mn_setup = dragonfly_setup,
    .model_net_method_packet_event = dragonfly_packet_event,
    .model_net_method_packet_event_rc = dragonfly_packet_event_rc,
    .mn_get_lp_type = dragonfly_get_cn_lp_type,
    .mn_get_msg_sz = dragonfly_get_msg_sz,
    .mn_report_stats = dragonfly_report_stats,
    .model_net_method_find_local_device = dragonfly_find_local_device,
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    .mn_collective_call = dragonfly_collective,
    .mn_collective_call_rc = dragonfly_collective_rc   
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};

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Philip Carns committed
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/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */