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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 CREDIT_SIZE 8
#define MEAN_PROCESS 1.0

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/* collective specific parameters */
#define TREE_DEGREE 4
#define LEVEL_DELAY 1000
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#define DRAGONFLY_COLLECTIVE_DEBUG 0
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#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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static double maxd(double a, double b) { return a < b ? b : a; }

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// arrival rate
static double MEAN_INTERVAL=200.0;
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// threshold for adaptive routing
static int adaptive_threshold = 10;
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/* minimal and non-minimal packet counts for adaptive routing*/
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int minimal_count=0, nonmin_count=0;
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typedef struct dragonfly_param dragonfly_param;
/* annotation-specific parameters (unannotated entry occurs at the 
 * last index) */
static uint64_t                  num_params = 0;
static dragonfly_param         * all_params = NULL;
static const config_anno_map_t * anno_map   = NULL;
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/* global variables for codes mapping */
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static char lp_group_name[MAX_NAME_LENGTH];
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static int mapping_grp_id, mapping_type_id, mapping_rep_id, mapping_offset;

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struct dragonfly_param
{
    // configuration parameters
    int num_routers; /*Number of routers in a group*/
    double local_bandwidth;/* bandwidth of the router-router channels within a group */
    double global_bandwidth;/* bandwidth of the inter-group router connections */
    double cn_bandwidth;/* bandwidth of the compute node channels connected to routers */
    int num_vcs; /* number of virtual channels */
    int local_vc_size; /* buffer size of the router-router channels */
    int global_vc_size; /* buffer size of the global channels */
    int cn_vc_size; /* buffer size of the compute node channels */
    int routing; /* minimal or non-minimal routing */
    int chunk_size; /* full-sized packets are broken into smaller chunks.*/

    // derived parameters
    int num_cn;
    int num_groups;
    int radix;
    int total_routers;
    int num_global_channels;
};

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/* 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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   const char * anno;
   const dragonfly_param *params;
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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
{
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    MINIMAL = 0,
    NON_MINIMAL,
    ADAPTIVE
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};

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;
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   const char * anno;
   const dragonfly_param *params;
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};

static short routing = MINIMAL;

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);
}

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static void dragonfly_read_config(const char * anno, dragonfly_param *params){
    // shorthand
    dragonfly_param *p = params;
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    configuration_get_value_int(&config, "PARAMS", "num_routers", anno,
            &p->num_routers);
    if(p->num_routers <= 0) {
        p->num_routers = 4;
        fprintf(stderr, "Number of dimensions not specified, setting to %d\n",
                p->num_routers);
    }

    configuration_get_value_int(&config, "PARAMS", "num_vcs", anno,
            &p->num_vcs);
    if(p->num_vcs <= 0) {
        p->num_vcs = 1;
        fprintf(stderr, "Number of virtual channels not specified, setting to %d\n", p->num_vcs);
    }

    configuration_get_value_int(&config, "PARAMS", "local_vc_size", anno, &p->local_vc_size);
    if(!p->local_vc_size) {
        p->local_vc_size = 1024;
        fprintf(stderr, "Buffer size of local channels not specified, setting to %d\n", p->local_vc_size);
    }

    configuration_get_value_int(&config, "PARAMS", "global_vc_size", anno, &p->global_vc_size);
    if(!p->global_vc_size) {
        p->global_vc_size = 2048;
        fprintf(stderr, "Buffer size of global channels not specified, setting to %d\n", p->global_vc_size);
    }

    configuration_get_value_int(&config, "PARAMS", "cn_vc_size", anno, &p->cn_vc_size);
    if(!p->cn_vc_size) {
        p->cn_vc_size = 1024;
        fprintf(stderr, "Buffer size of compute node channels not specified, setting to %d\n", p->cn_vc_size);
    }

    configuration_get_value_int(&config, "PARAMS", "chunk_size", anno, &p->chunk_size);
    if(!p->chunk_size) {
        p->chunk_size = 64;
        fprintf(stderr, "Chunk size for packets is specified, setting to %d\n", p->chunk_size);
    }

    configuration_get_value_double(&config, "PARAMS", "local_bandwidth", anno, &p->local_bandwidth);
    if(!p->local_bandwidth) {
        p->local_bandwidth = 5.25;
        fprintf(stderr, "Bandwidth of local channels not specified, setting to %lf\n", p->local_bandwidth);
    }

    configuration_get_value_double(&config, "PARAMS", "global_bandwidth", anno, &p->global_bandwidth);
    if(!p->global_bandwidth) {
        p->global_bandwidth = 4.7;
        fprintf(stderr, "Bandwidth of global channels not specified, setting to %lf\n", p->global_bandwidth);
    }

    configuration_get_value_double(&config, "PARAMS", "cn_bandwidth", anno, &p->cn_bandwidth);
    if(!p->cn_bandwidth) {
        p->cn_bandwidth = 5.25;
        fprintf(stderr, "Bandwidth of compute node channels not specified, setting to %lf\n", p->cn_bandwidth);
    }


    char routing[MAX_NAME_LENGTH];
    configuration_get_value(&config, "PARAMS", "routing", anno, routing,
            MAX_NAME_LENGTH);
    if(strcmp(routing, "minimal") == 0)
        p->routing = 0;
    else if(strcmp(routing, "nonminimal")==0 || strcmp(routing,"non-minimal")==0)
        p->routing = 1;
    else if (strcmp(routing, "adaptive") == 0)
        p->routing = 2;
    else
    {
        fprintf(stderr, 
                "No routing protocol specified, setting to minimal routing\n");
        p->routing = 0;
    }

    // set the derived parameters
    p->num_cn = p->num_routers/2;
    p->num_global_channels = p->num_routers/2;
    p->num_groups = p->num_routers * p->num_cn + 1;
    p->radix = p->num_vcs *
        (p->num_cn + p->num_global_channels + p->num_routers);
    p->total_routers = p->num_groups * p->num_routers;
}

static void dragonfly_configure(){
    anno_map = codes_mapping_get_lp_anno_map(LP_CONFIG_NM);
    assert(anno_map);
    num_params = anno_map->num_annos + (anno_map->has_unanno_lp > 0);
    all_params = malloc(num_params * sizeof(*all_params));

    for (uint64_t i = 0; i < anno_map->num_annos; i++){
        const char * anno = anno_map->annotations[i];
        dragonfly_read_config(anno, &all_params[i]);
    }
    if (anno_map->has_unanno_lp > 0){
        dragonfly_read_config(NULL, &all_params[anno_map->num_annos]);
    }
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}

/* 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;
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   int total_minimal_packets, total_nonmin_packets;
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   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);
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   if(routing == ADAPTIVE)
    {
	MPI_Reduce(&minimal_count, &total_minimal_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
 	MPI_Reduce(&nonmin_count, &total_nonmin_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    }
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   /* 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);
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     if(routing == ADAPTIVE)
              printf("\n ADAPTIVE ROUTING STATS: %d packets routed minimally %d packets routed non-minimally ", total_minimal_packets, total_nonmin_packets);
 
  }
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   return;
}
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void dragonfly_collective_init(terminal_state * s,
           		   tw_lp * lp)
{
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    // TODO: be annotation-aware
    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
            NULL, 1);
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    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;
    char* tmp_ptr;

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    xfer_to_nic_time = 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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    //printf("\n transfer in time %f %f ", xfer_to_nic_time+offset, tw_now(sender));
    //e_new = tw_event_new(sender->gid, xfer_to_nic_time+offset, sender);
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    //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;
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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)
{
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    const dragonfly_param *p = r->params;
  int group_begin = r->group_id * p->num_routers;
  int group_end = (r->group_id * p->num_routers) + p->num_routers-1;
  int offset = (gid * p->num_routers - group_begin) / p->num_routers;
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  if((gid * p->num_routers) < group_begin)
    offset = (group_begin - gid * p->num_routers) / p->num_routers; // take absolute value
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  int half_channel = p->num_global_channels / 2;
  int index = (offset - 1)/(half_channel * p->num_routers);
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  offset=(offset - 1) % (half_channel * p->num_routers);
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  // 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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  const dragonfly_param *p = s->params;
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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
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   credit_delay = (1 / p->cn_bandwidth) * CREDIT_SIZE;
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   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;
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     credit_delay = (1 / p->global_bandwidth) * CREDIT_SIZE;
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   }
    else if(msg->last_hop == LOCAL)
     {
        dest = msg->intm_lp_id;
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     	credit_delay = (1/p->local_bandwidth) * CREDIT_SIZE;
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     }
    else
      printf("\n Invalid message type");

   // Assume it takes 0.1 ns of serialization latency for processing the credits in the queue
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    int output_port = msg->saved_vc / p->num_vcs;
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    msg->saved_available_time = s->next_credit_available_time[output_port];
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    s->next_credit_available_time[output_port] = maxd(tw_now(lp), s->next_credit_available_time[output_port]);
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    ts = credit_delay + 0.1 + tw_rand_exponential(lp->rng, (double)credit_delay/1000);
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    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)
{
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    tw_lpid dest_terminal_id;
    codes_mapping_get_lp_info(msg->final_dest_gid, lp_group_name, &mapping_grp_id,
            NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->anno, 0,
            mapping_rep_id, mapping_offset, &dest_terminal_id);
    msg->dest_terminal_id = dest_terminal_id;

    const dragonfly_param *p = s->params;

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  tw_stime ts;
  tw_event *e;
  terminal_message *m;
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  int i, total_event_size;
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  uint64_t num_chunks = msg->packet_size / p->chunk_size;
  if (msg->packet_size % s->params->chunk_size)
      num_chunks++;
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  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 = g_tw_lookahead + 0.1 + tw_rand_exponential(lp->rng, MEAN_INTERVAL/200);
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	int chan = -1, j;
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	for(j = 0; j < p->num_vcs; j++)
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	 {
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	     if(s->vc_occupancy[j] < p->cn_vc_size * num_chunks)
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	      {
	       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));
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       m->dest_terminal_id = dest_terminal_id;
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       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;
620
  stat->send_time += (1/p->cn_bandwidth) * msg->packet_size;
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  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;
638
   double head_delay = (1/s->params->cn_bandwidth) * s->params->chunk_size;
639
   ts = head_delay + tw_rand_exponential(lp->rng, (double)head_delay/200);
640
   s->terminal_available_time = maxd(s->terminal_available_time, tw_now(lp));
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   s->terminal_available_time += ts;

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   //TODO: be annotation-aware
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
   codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", NULL, 1,
           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);

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   uint64_t num_chunks = msg->packet_size/s->params->chunk_size;
   if(msg->packet_size % s->params->chunk_size)
       num_chunks++;

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   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;
682
	   ts = g_tw_lookahead + (1/s->params->cn_bandwidth) * msg->local_event_size_bytes;
683
	   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]++;

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   if(s->vc_occupancy[vc] >= (s->params->cn_vc_size * num_chunks))
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      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)
{
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    uint64_t num_chunks = msg->packet_size / s->params->chunk_size;
    if (msg->packet_size % s->params->chunk_size)
        num_chunks++;
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#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)
	{
747
            void * tmp_ptr = model_net_method_get_edata(DRAGONFLY, msg);
748
            ts = g_tw_lookahead + 0.1 + (1/s->params->cn_bandwidth) * msg->remote_event_size_bytes;
749
            if (msg->is_pull){
750
                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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	}
  }

764
  int credit_delay = (1 / s->params->cn_bandwidth) * CREDIT_SIZE;
765
  ts = credit_delay + 0.1 + tw_rand_exponential(lp->rng, credit_delay/1000);
766
  
767
  msg->saved_credit_time = s->next_credit_available_time;
768
  s->next_credit_available_time = maxd(s->next_credit_available_time, tw_now(lp));
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  s->next_credit_available_time += ts;

  tw_lpid router_dest_id;
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  //TODO: be annotation-aware
  codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
          &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", s->anno, 0,
776
          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;
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    char anno[MAX_NAME_LENGTH];

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    // Assign the global router ID
798
    // TODO: be annotation-aware
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    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
            &mapping_type_id, anno, &mapping_rep_id, &mapping_offset);
    if (anno[0] == '\0'){
        s->anno = NULL;
        s->params = &all_params[num_params-1];
    }
    else{
        s->anno = anno;
        int id = configuration_get_annotation_index(anno, anno_map);
        s->params = &all_params[id];
    }

811
   int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
812
           s->anno, 0);
813 814

   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;  
815
   s->router_id=(int)s->terminal_id / s->params->num_routers;
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   s->terminal_available_time = 0.0;
   s->packet_counter = 0;

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   s->vc_occupancy = (int*)malloc(s->params->num_vcs * sizeof(int));
   s->output_vc_state = (int*)malloc(s->params->num_vcs * sizeof(int));
821

822
   for( i = 0; i < s->params->num_vcs; i++ )
823 824 825 826
    {
      s->vc_occupancy[i]=0;
      s->output_vc_state[i]=VC_IDLE;
    }
827
   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;

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    codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id,
            NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
            mapping_rep_id, mapping_offset, &local_nic_id);
844

845
    xfer_to_nic_time = codes_local_latency(sender);
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    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;
885
            ts = (1/s->params->cn_bandwidth) * msg->remote_event_size_bytes;
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
            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 */
914 915 916 917 918
            // TODO: be annotation-aware
            codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id,
                    NULL, &mapping_type_id, NULL, &mapping_rep_id,
                    &mapping_offset);
            num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
919 920
                    s->anno, 0);
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->anno, 0,
921 922
                    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, 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++;

953 954 955
        codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id,
                NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
956
                s->anno, 0);
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974

        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 */
975
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->anno, 0,
976 977
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013

           /* 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 */
1014 1015 1016
                codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
                        s->children[i]/num_lps, (s->children[i] % num_lps),
                        &child_nic_id);
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
                //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){
1027
	                memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
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        	               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;
1045 1046
        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
                NULL, 1);
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
        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 */
1068
                        codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM,
1069
                                s->anno, 0, s->children[i]/num_lps,
1070
                                (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);
                        //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;
1138 1139 1140 1141
    
    case D_COLLECTIVE_INIT:
      node_collective_init(s, bf, msg, lp);
    break;
1142

1143 1144 1145 1146 1147 1148 1149 1150
    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;
    
1151 1152 1153 1154 1155 1156
    default:
       printf("\n LP %d Terminal message type not supported %d ", (int)lp->gid, msg->type);
    }
}

void 
1157
dragonfly_terminal_final( terminal_state * s, 
1158 1159
      tw_lp * lp )
{
1160
	model_net_print_stats(lp->gid, s->dragonfly_stats_array);
1161 1162
}

1163 1164 1165 1166 1167
void dragonfly_router_final(router_state * s,
		tw_lp * lp)
{
   free(s->global_channel);
}
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
/* 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;
1179
   tw_lpid router_dest_id = -1;
1180 1181 1182
   int i;
   int dest_group_id;

1183 1184 1185 1186 1187
   //TODO: be annotation-aware
   codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name,
           &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id,
           &mapping_offset); 
   int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
1188 1189
           s->anno, 0);
   int dest_router_id = (mapping_offset + (mapping_rep_id * num_lps)) / s->params->num_routers;
1190
   
1191 1192
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
1193 1194 1195 1196
   int local_router_id = (mapping_offset + mapping_rep_id);

   bf->c2 = 0;

1197
  /* If the packet has arrived at the destination router */
1198 1199 1200 1201 1202 1203
   if(dest_router_id == local_router_id)
    {
        dest_lp = msg->dest_terminal_id;

        return dest_lp;
    }
1204
   /* Generate inter-mediate destination for non-minimal routing (selecting a random group) */
1205
   if(msg->last_hop == TERMINAL && msg->path_type == NON_MINIMAL)
1206
    {
1207
      if(dest_router_id / s->params->num_routers != s->group_id)
1208 1209
         {
            bf->c2 = 1;
1210
            int intm_grp_id = tw_rand_integer(lp->rng, 0, s->params->num_groups-1);
1211 1212
            //int intm_grp_id = (s->group_id + s->group_id/2) % num_groups;
	    msg->intm_group_id = intm_grp_id;
1213 1214
          }    
    }
1215
  /* It means that the packet has arrived at the inter-mediate group for non-minimal routing. Reset the group now. */
1216 1217 1218 1219
   if(msg->intm_group_id == s->group_id)
   {  
           msg->intm_group_id = -1;//no inter-mediate group
   } 
1220
  /* Intermediate group ID is set. Divert the packet to an intermediate group. */
1221 1222 1223 1224
  if(msg->intm_group_id >= 0)
   {
      dest_group_id = msg->intm_group_id;
   }
1225
  else /* direct the packet to the destination group */
1226
   {
1227
     dest_group_id = dest_router_id / s->params->num_routers;
1228 1229
   }
  
1230
  /* It means the packet has arrived at the destination group. Now divert it to the destination router. */
1231 1232 1233 1234 1235 1236
  if(s->group_id == dest_group_id)
   {
     dest_lp = dest_router_id;
   }
   else
   {
1237
      /* Packet is at the source or intermediate group. Find a router that has a path to the destination group. */
1238 1239 1240 1241
      dest_lp=getRouterFromGroupID(dest_group_id,s);
  
      if(dest_lp == local_router_id)
      {
1242
        for(i=0; i < s->params->num_global_channels; i++)
1243
           {
1244
            if(s->global_channel[i] / s->params->num_routers == dest_group_id)
1245 1246 1247 1248
                dest_lp=s->global_channel[i];
          }
      }
   }
1249
  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", s->anno, 0, dest_lp,
1250
          0, &router_dest_id);
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
  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;
1263 1264 1265
  codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name,
          &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id,
          &mapping_offset);
1266
  int num_lps = codes_mapping_get_lp_count(lp_group_name,1,LP_CONFIG_NM,s->anno,0);
1267
  terminal_id = (mapping_rep_id * num_lps) + mapping_offset;
1268 1269 1270

  if(next_stop == msg->dest_terminal_id)
   {
1271 1272
      output_port = s->params->num_routers + s->params->num_global_channels +
          ( terminal_id % s->params->num_cn);
1273 1274
      //if(output_port > 6)
	//      printf("\n incorrect output port %d terminal id %d ", output_port, terminal_id);
1275 1276 1277
    }
    else
    {
1278 1279
     codes_mapping_get_lp_info(next_stop, lp_group_name, &mapping_grp_id,
             NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
1280
     int local_router_id = mapping_rep_id + mapping_offset;
1281
     int intm_grp_id = local_router_id / s->params->num_routers;
1282 1283 1284

     if(intm_grp_id != s->group_id)
      {
1285
        for(i=0; i < s->params->num_global_channels; i++)
1286
         {
1287
           if(s->global_channel[i] == local_router_id)
1288
             output_port = s->params->num_routers + i;
1289 1290 1291 1292
          }
      }
      else
       {
1293
        output_port = local_router_id % s->params->num_routers;
1294
       }
1295
//	      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);
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
    }
    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)
{
1306
//   *(int *)bf = (int)0;
1307 1308 1309 1310 1311
   tw_stime ts;
   tw_event *e;
   terminal_message *m;

   int next_stop = -1, output_port = -1, output_chan = -1;
1312 1313
   float bandwidth = s->params->local_bandwidth;
   int path = s->params->routing;
1314
   int minimal_out_port = -1, nonmin_out_port = -1;
1315 1316
   bf->c3 = 0;

1317 1318 1319 1320 1321 1322
   uint64_t num_chunks = msg->packet_size/s->params->chunk_size;
   if(msg->packet_size % s->params->chunk_size)
       num_chunks++;
    

   if(msg->last_hop == TERMINAL && s->params->routing == ADAPTIVE)
1323
   {
1324 1325 1326 1327 1328 1329 1330
  // decide which routing to take
    int minimal_next_stop=get_next_stop(s, bf, msg, lp, MINIMAL);
    minimal_out_port = get_output_port(s, bf, msg, lp, minimal_next_stop);
    int nonmin_next_stop = get_next_stop(s, bf, msg, lp, NON_MINIMAL);
    nonmin_out_port = get_output_port(s, bf, msg, lp, nonmin_next_stop);
    int nonmin_port_count = s->vc_occupancy[nonmin_out_port];
    int min_port_count = s->vc_occupancy[minimal_out_port];
1331 1332
    int nonmin_vc = s->vc_occupancy[nonmin_out_port * s->params->num_vcs + 2];
    int min_vc = s->vc_occupancy[minimal_out_port * s->params->num_vcs + 1];
1333 1334

    // Adaptive routing condition from the dragonfly paper Page 83
1335
   // modified according to booksim adaptive routing condition
1336 1337 1338
   if((min_vc <= (nonmin_vc * 2 + adaptive_threshold) && minimal_out_port == nonmin_out_port)
               || (min_port_count <= (nonmin_port_count * 2 + adaptive_threshold) && minimal_out_port != nonmin_out_port))
        {
1339
	   msg->path_type = MINIMAL;
1340 1341 1342 1343
           next_stop = minimal_next_stop;
           output_port = minimal_out_port;
           minimal_count++;
           msg->intm_group_id = -1;
1344

1345 1346 1347 1348 1349
           if(msg->packet_ID == TRACK)
              printf("\n (%lf) [Router %d] Packet %d routing minimally ", tw_now(lp), (int)lp->gid, (int)msg->packet_ID);
        }
       else
         {
1350
	   msg->path_type = NON_MINIMAL;
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
           next_stop = nonmin_next_stop;
           output_port = nonmin_out_port;
           nonmin_count++;
           if(msg->packet_ID == TRACK)
                printf("\n (%lf) [Router %d] Packet %d routing non-minimally ", tw_now(lp), (int)lp->gid, (int)msg->packet_ID);

         }
  }
  else
   {
1361
	msg->path_type = routing; /*defaults to the routing algorithm if we don't have adaptive routing here*/
1362 1363 1364
   	next_stop = get_next_stop(s, bf, msg, lp, path);
   	output_port = get_output_port(s, bf, msg, lp, next_stop); 
   }
1365
   output_chan = output_port * s->params->num_vcs;
1366

1367
    // Even numbered channels for minimal routing
1368
   // Odd numbered channels for nonminimal routing
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379
   // Separate the queue occupancy into minimal and non minimal virtual channels if the min & non min
   // paths start at the same output port
   /*if((routing == ADAPTIVE) && (minimal_out_port == nonmin_out_port))
   {
        if(path == MINIMAL)
          output_chan = output_chan + 1;
        else
          if(path == NON_MINIMAL)
            output_chan = output_chan + 2;
   }*/

1380
   int global=0;
1381
   int buf_size = s->params->local_vc_size;
1382

1383 1384
   assert(output_port != -1);
   assert(output_chan != -1);
1385
   // Allocate output Virtual Channel
1386 1387
  if(output_port >= s->params->num_routers && 
          output_port < s->params->num_routers + s->params->num_global_channels)
1388
  {
1389
	 bandwidth = s->params->global_bandwidth;
1390
	 global = 1;
1391
	 buf_size = s->params->global_vc_size;
1392 1393
  }

1394 1395
  if(output_port >= s->params->num_routers + s->params->num_global_channels)
	buf_size = s->params->cn_vc_size;
1396 1397 1398

   if(s->vc_occupancy[output_chan] >= buf_size)
    {
1399
	    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], s->params->radix, next_stop);
1400
	    bf->c3 = 1;
1401 1402 1403
	    return;
	    //MPI_Finalize();
	    //exit(-1);
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
    }

#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];
1416
  ts = g_tw_lookahead + 0.1 + ((1/bandwidth) * s->params->chunk_size) + tw_rand_exponential(lp->rng, (double)s->params->chunk_size/200);
1417

1418
  s->next_output_available_time[output_port] = maxd(s->next_output_available_time[output_port], tw_now(lp));
1419
  s->next_output_available_time[output_port] += ts;
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
  // 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);
  }
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446

  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]++;

1447 1448
  /* Determine the event type. If the packet has arrived at the final destination
     router then it should arrive at the destination terminal next. */
1449 1450 1451 1452
  if(next_stop == msg->dest_terminal_id)
  {
    m->type = T_ARRIVE;

1453
    if(s->vc_occupancy[output_chan] >= s->params->cn_vc_size * num_chunks)
1454 1455 1456 1457
      s->output_vc_state[output_chan] = VC_CREDIT;
  }
  else
  {
1458
    /* The packet has to be sent to another router */
1459 1460
    m->type = R_ARRIVE;

1461
   /* If this is a global channel then the buffer space is different */
1462 1463
   if( global )
   {
1464
     if(s->vc_occupancy[output_chan] >= s->params->global_vc_size * num_chunks )
1465 1466 1467 1468
       s->output_vc_state[output_chan] = VC_CREDIT;
   }
  else
    {
1469
     /* buffer space is less for local channels */
1470
     if( s->vc_occupancy[output_chan] >= s->params->local_vc_size * num_chunks )
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
	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++;
1490
    ts = g_tw_lookahead + 0.1 + tw_rand_exponential(lp->rng, (double)MEAN_INTERVAL/200);
1491 1492 1493
    uint64_t num_chunks = msg->packet_size/s->params->chunk_size;
    if(msg->packet_size % s->params->chunk_size)
        num_chunks++;
1494 1495 1496 1497

    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);
   
1498
    // router self message - no need for method_event
1499 1500
    e = tw_event_new(lp->gid, ts, lp);
    m = tw_event_data(e);
1501
    memcpy(m, msg, sizeof(terminal_message) + msg->remote_event_size_bytes);
1502 1503 1504 1505 1506 1507 1508 1509 1510
    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)
{