fattree.c 79.3 KB
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#include <ross.h>

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#include "codes/jenkins-hash.h"
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#include "codes/codes_mapping.h"
#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
#include "codes/model-net-lp.h"
#include "codes/net/fattree.h"
#include "sys/file.h"
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#include "codes/quickhash.h"
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#include "codes/rc-stack.h"
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//#include "codes/map_messages.h"

#define CREDIT_SIZE 8
#define MEAN_PROCESS 1.0

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#define FTREE_HASH_TABLE_SIZE 262144

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// debugging parameters
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//#define TRACK_PKT -1
#define TRACK_PKT 2820
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#define FATTREE_HELLO 0
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#define FATTREE_DEBUG 0
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#define FATTREE_CONNECTIONS 0
#define FATTREE_MSG 0
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#define DEBUG_RC 1
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//Data Collection Output Files
#define PARAMS_LOG 1

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

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#if DEBUG_RC
  //Reverse Compute Debug Variables
  long long packet_event_f = 0;
  long long packet_event_r = 0;
  long long t_generate_f = 0;
  long long t_generate_r = 0;
  long long t_send_f = 0;
  long long t_send_r = 0;
  long long t_arrive_f = 0;
  long long t_arrive_r = 0;
  long long t_buffer_f = 0;
  long long t_buffer_r = 0;
  long long s_send_f = 0;
  long long s_send_r = 0;
  long long s_arrive_f = 0;
  long long s_arrive_r = 0;
  long long s_buffer_f = 0;
  long long s_buffer_r = 0;
#endif

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long fattree_packet_gen = 0, fattree_packet_fin = 0;

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static double maxd(double a, double b) { return a < b ? b : a; }

// arrival rate
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//static double MEAN_INTERVAL=200.0;
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typedef struct fattree_param fattree_param;
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/* annotation-specific parameters (unannotated entry occurs at the
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 * last index) */
static uint64_t                  num_params = 0;
static fattree_param           * all_params = NULL;
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static const config_anno_map_t * anno_map   = NULL;
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/* global variables for codes mapping */
static char lp_group_name[MAX_NAME_LENGTH];
static char def_group_name[MAX_NAME_LENGTH];
static int def_gname_set = 0;
static int mapping_grp_id, mapping_type_id, mapping_rep_id, mapping_offset;

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/* switch magic number */
int switch_magic_num = 0;

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/* terminal magic number */
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int fattree_terminal_magic_num = 0;
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typedef struct fattree_message_list fattree_message_list;
struct fattree_message_list {
    fattree_message msg;
    char* event_data;
    fattree_message_list *next;
    fattree_message_list *prev;
};

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void init_fattree_message_list(fattree_message_list *this,
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  fattree_message *inmsg) {
    this->msg = *inmsg;
    this->event_data = NULL;
    this->next = NULL;
    this->prev = NULL;
}

void delete_fattree_message_list(fattree_message_list *this) {
    if(this->event_data != NULL) free(this->event_data);
    free(this);
}

struct fattree_param
{
  int ft_type;
  // configuration parameters
  int num_levels;
  int *num_switches; //switches at various levels
  int *switch_radix; //radix of switches are various levels
  double link_bandwidth;/* bandwidth of a wire connecting switches */
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  double cn_bandwidth;/* bandwidth of the compute node channels
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                        connected to switch */
  int vc_size; /* buffer size of the link channels */
  int cn_vc_size; /* buffer size of the compute node channels */
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  int chunk_size; /* full-sized packets are broken into smaller chunks.*/
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  int packet_size;
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  int num_terminals;
  int l1_set_size;
  int l1_term_size;
  double cn_delay;
  double head_delay;
  double credit_delay;
  double router_delay;
  double soft_delay;
};

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struct ftree_hash_key
{
    uint64_t message_id;
    tw_lpid sender_id;
};

struct ftree_qhash_entry
{
   struct ftree_hash_key key;
   char * remote_event_data;
   int num_chunks;
   int remote_event_size;
   struct qhash_head hash_link;
};

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/* convert GiB/s and bytes to ns */
 static tw_stime bytes_to_ns(uint64_t bytes, double GB_p_s)
 {
     tw_stime time;
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     /* bytes to GB */
     time = ((double)bytes)/(1024.0*1024.0*1024.0);
     /* GiB to s */
     time = time / GB_p_s;
     /* s to ns */
     time = time * 1000.0 * 1000.0 * 1000.0;
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     return(time);
 }

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/* handles terminal and switch events like packet generate/send/receive/buffer */
typedef enum event_t event_t;
typedef struct ft_terminal_state ft_terminal_state;
typedef struct switch_state switch_state;

/* fattree compute node data structure */
struct ft_terminal_state
{
  unsigned long long packet_counter;
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  int packet_gen;
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  int packet_fin;
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  // Fattree specific parameters
  unsigned int terminal_id;
  unsigned int switch_id;
  tw_lpid switch_lp;

  // Each terminal will have an input and output channel with the switch
  int vc_occupancy; // NUM_VC
  tw_stime terminal_available_time;
  tw_stime next_credit_available_time;
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  struct mn_stats fattree_stats_array[CATEGORY_MAX];

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  fattree_message_list **terminal_msgs;
  fattree_message_list **terminal_msgs_tail;
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  int terminal_length;
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  int in_send_loop;
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  int issueIdle;

   struct rc_stack * st;
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  char * anno;
  fattree_param *params;
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  struct qhash_table *rank_tbl;
  uint64_t rank_tbl_pop;

  tw_stime   total_time;
  uint64_t total_msg_size;
  double total_hops;
  long finished_msgs;
  long finished_chunks;
  long finished_packets;

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  tw_stime last_buf_full;
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  tw_stime busy_time;
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  char output_buf[4096];
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  char output_buf3[4096];
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  /* For sampling */
  long fin_chunks_sample;
  long data_size_sample;
  double fin_hops_sample;
  tw_stime fin_chunks_time;
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 tw_stime busy_time_sample;
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};

/* terminal event type (1-4) */
enum event_t
{
  T_GENERATE=1,
  T_ARRIVE,
  T_SEND,
  T_BUFFER,
  S_SEND,
  S_ARRIVE,
  S_BUFFER,
};

enum last_hop
{
   LINK,
   TERMINAL
};

struct switch_state
{
  unsigned int switch_id;
  int switch_level;
  int radix;
  int num_cons;
  int num_lcons;
  int con_per_lneigh;
  int con_per_uneigh;;
  int start_lneigh;
  int end_lneigh;
  int start_uneigh;
  int unused;

  tw_stime* next_output_available_time;
  tw_stime* next_credit_available_time;
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  tw_stime* last_buf_full;

  tw_stime* busy_time;
  tw_stime* busy_time_sample;

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  fattree_message_list **pending_msgs;
  fattree_message_list **pending_msgs_tail;
  fattree_message_list **queued_msgs;
  fattree_message_list **queued_msgs_tail;
  int *queued_length;
  int *in_send_loop;
  int* vc_occupancy;
  int64_t* link_traffic;
  tw_lpid *port_connections;

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  char output_buf[4096];
  char output_buf2[4096];

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  struct rc_stack * st;

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  char * anno;
  fattree_param *params;
};

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static tw_stime         fattree_total_time = 0;
static tw_stime         fattree_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;
static long long       total_msg_sz = 0;
static long long       N_finished_msgs = 0;
static long long       N_finished_chunks = 0;

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static int fattree_rank_hash_compare(
void *key, struct qhash_head *link)
{
    struct ftree_hash_key *message_key = (struct ftree_hash_key *)key;
    struct ftree_qhash_entry *tmp = NULL;

    tmp = qhash_entry(link, struct ftree_qhash_entry, hash_link);

    if (tmp->key.message_id == message_key->message_id
            && tmp->key.sender_id == message_key->sender_id)
        return 1;

    return 0;
}
static int fattree_hash_func(void *k, int table_size)
{
    struct ftree_hash_key *tmp = (struct ftree_hash_key *)k;
    //uint32_t pc = 0, pb = 0;
    //bj_hashlittle2(tmp, sizeof(*tmp), &pc, &pb);
    uint64_t key = (~tmp->message_id) + (tmp->message_id << 18);
    key = key * 21;
    key = ~key ^ (tmp->sender_id >> 4);
    key = key * tmp->sender_id;
    return (int)(key & (table_size - 1));
    //return (int)(pc % (table_size - 1));
}

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static void free_tmp(void * ptr)
{
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    struct ftree_qhash_entry * ftree = ptr;
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    free(ftree->remote_event_data);
    free(ftree);
}

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static void append_to_fattree_message_list(
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        fattree_message_list ** thisq,
        fattree_message_list ** thistail,
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        int index,
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        fattree_message_list *msg) {
    if(thisq[index] == NULL) {
        thisq[index] = msg;
    } else {
        thistail[index]->next = msg;
        msg->prev = thistail[index];
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    }
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    thistail[index] = msg;
}

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static void prepend_to_fattree_message_list(
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        fattree_message_list ** thisq,
        fattree_message_list ** thistail,
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        int index,
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        fattree_message_list *msg) {
    if(thisq[index] == NULL) {
        thistail[index] = msg;
    } else {
        thisq[index]->prev = msg;
        msg->next = thisq[index];
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    }
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    thisq[index] = msg;
}

static fattree_message_list* return_head(
        fattree_message_list ** thisq,
        fattree_message_list ** thistail,
        int index) {
    fattree_message_list *head = thisq[index];
    if(head != NULL) {
        thisq[index] = head->next;
        if(head->next != NULL) {
            head->next->prev = NULL;
            head->next = NULL;
        } else {
            thistail[index] = NULL;
        }
    }
    return head;
}

static fattree_message_list* return_tail(
        fattree_message_list ** thisq,
        fattree_message_list ** thistail,
        int index) {
    fattree_message_list *tail = thistail[index];
    if(tail->prev != NULL) {
        tail->prev->next = NULL;
        thistail[index] = tail->prev;
        tail->prev = NULL;
    } else {
        thistail[index] = NULL;
        thisq[index] = NULL;
    }
    return tail;
}

//decl
void switch_credit_send(switch_state * s, tw_bf * bf, fattree_message * msg,
    tw_lp * lp, int sq);
int ft_get_output_port( switch_state * s, tw_bf * bf, fattree_message * msg,
    tw_lp * lp, int *out_off );
int get_base_port(switch_state *s, int from_term, int index);


/* returns the fattree switch lp type for lp registration */
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//static const tw_lptype* fattree_get_switch_lp_type(void);
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/* returns the fattree message size */
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static int fattree_get_msg_sz(void)
{
  return sizeof(fattree_message);
}

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static void fattree_read_config(const char * anno, fattree_param *p){
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  int i;

  p->ft_type = 0;
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  configuration_get_value_int(&config, "PARAMS", "ft_type", anno,
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      &p->ft_type);

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  configuration_get_value_int(&config, "PARAMS", "num_levels", anno,
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      &p->num_levels);
  if(p->num_levels <= 0) {
    tw_error(TW_LOC, "Too few num_levels, Aborting\n");
  }
  if(p->num_levels > 3) {
    tw_error(TW_LOC, "Too many num_levels, only upto 3 supported Aborting\n");
  }

  p->num_switches = (int *) malloc (p->num_levels * sizeof(int));
  p->switch_radix = (int*) malloc (p->num_levels * sizeof(int));

  char switch_counts_str[MAX_NAME_LENGTH];
  int rc = configuration_get_value(&config, "PARAMS", "switch_count", anno,
      switch_counts_str, MAX_NAME_LENGTH);
  if (rc == 0){
    tw_error(TW_LOC, "couldn't read PARAMS:switch_count");
  }
  char* token;
  token = strtok(switch_counts_str, ",");
  i = 0;
  while(token != NULL)
  {
    sscanf(token, "%d", &p->num_switches[i]);
    if(p->num_switches[i] <= 0)
    {
      tw_error(TW_LOC, "Invalid switch count  specified "
          "(%d at pos %d), exiting... ", p->num_switches[i], i);
    }
    i++;
    token = strtok(NULL,",");
  }

  //if(i != p->num_levels) {
  //  tw_error(TW_LOC, "Not enough switch counts, Aborting\n");
  //}
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  char switch_radix_str[MAX_NAME_LENGTH];
  rc = configuration_get_value(&config, "PARAMS", "switch_radix", anno,
      switch_radix_str, MAX_NAME_LENGTH);
  if (rc == 0){
    tw_error(TW_LOC, "couldn't read PARAMS:switch_radix");
  }
  token = strtok(switch_radix_str, ",");
  i = 0;
  while(token != NULL)
  {
    sscanf(token, "%d", &p->switch_radix[i]);
    if(p->switch_radix[i] <= 0)
    {
      tw_error(TW_LOC, "Invalid switch radix  specified "
          "(%d at pos %d), exiting... ", p->switch_radix[i], i);
    }
    i++;
    token = strtok(NULL,",");
  }

  if(p->num_levels == 2) {
    p->num_switches[1] = p->num_switches[0]/2;
    p->switch_radix[1] = p->switch_radix[0];
  } else {
    p->num_switches[1] = p->num_switches[0];
    p->num_switches[2] = p->num_switches[0]/2;
    p->switch_radix[1] = p->switch_radix[2] = p->switch_radix[0];
  }
  //if(i != p->num_levels) {
  //  tw_error(TW_LOC, "Not enough switch radix, Aborting\n");
  //}

  i = 1;
  for(i = 1; i < p->num_levels - 1; i++) {
    if(p->num_switches[i - 1] * p->switch_radix[i - 1] >
       p->num_switches[i] * p->switch_radix[i]) {
      tw_error(TW_LOC, "Not enough switches/radix at level %d for full "
          "bisection bandwidth\n", i);
    }
  }

  if(p->num_switches[i - 1] * p->switch_radix[i - 1] > 2 * p->num_switches[i] *
      p->switch_radix[i]) {
    tw_error(TW_LOC, "Not enough switches/radix at level %d (top) for full "
        "bisection bandwidth\n", i);
  }

  configuration_get_value_int(&config, "PARAMS", "packet_size", anno,
      &p->packet_size);
  if(!p->packet_size) {
    p->packet_size = 512;
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    fprintf(stderr, "Packet size is not specified, setting to %d\n",
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        p->packet_size);
  }
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  p->router_delay = 50;
  configuration_get_value_double(&config, "PARAMS", "router_delay", anno,
      &p->router_delay);
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  p->soft_delay = 1000;
  configuration_get_value_double(&config, "PARAMS", "soft_delay", anno,
      &p->soft_delay);

  configuration_get_value_int(&config, "PARAMS", "vc_size", anno, &p->vc_size);
  if(!p->vc_size) {
    p->vc_size = 8*p->packet_size;
    fprintf(stderr, "Buffer size of global channels not specified, setting to "
        "%d\n", p->vc_size);
  }

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  configuration_get_value_int(&config, "PARAMS", "cn_vc_size", anno,
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      &p->cn_vc_size);
  if(!p->cn_vc_size) {
    p->cn_vc_size = 8*p->packet_size;
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    fprintf(stderr, "Buffer size of compute node channels not specified, "
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        "setting to %d\n", p->cn_vc_size);
  }

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  rc = configuration_get_value_int(&config, "PARAMS", "chunk_size", anno, &p->chunk_size);
    if(rc) {
        p->chunk_size = 512;
        fprintf(stderr, "Chunk size for packets is specified, setting to %d\n", p->chunk_size);
    }

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  configuration_get_value_double(&config, "PARAMS", "link_bandwidth", anno,
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      &p->link_bandwidth);
  if(!p->link_bandwidth) {
    p->link_bandwidth = 5;
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    fprintf(stderr, "Bandwidth of links is specified, setting to %lf\n",
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        p->link_bandwidth);
  }

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  configuration_get_value_double(&config, "PARAMS", "cn_bandwidth", anno,
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      &p->cn_bandwidth);
  if(!p->cn_bandwidth) {
    p->cn_bandwidth = 5;
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    fprintf(stderr, "Bandwidth of compute node channels not specified, "
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        "setting to %lf\n", p->cn_bandwidth);
  }

  p->l1_set_size = p->switch_radix[0]/2;
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  p->l1_term_size = (p->l1_set_size * (p->switch_radix[0] / 2));

  p->cn_delay = (1.0 / p->cn_bandwidth);
  p->head_delay = (1.0 / p->link_bandwidth);
  p->credit_delay = (1.0 / p->link_bandwidth) * 8; //assume 8 bytes packet
}

static void fattree_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));

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

/* initialize a fattree compute node terminal */
void ft_terminal_init( ft_terminal_state * s, tw_lp * lp )
{
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    s->packet_gen = 0;
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    s->packet_fin = 0;

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    uint32_t h1 = 0, h2 = 0;
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    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    fattree_terminal_magic_num = h1 + h2;
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    char anno[MAX_NAME_LENGTH];

    if(def_gname_set == 0) {
      def_gname_set = 1;
      codes_mapping_get_lp_info(0, def_group_name, &mapping_grp_id, NULL,
          &mapping_type_id, anno, &mapping_rep_id, &mapping_offset);
    }

    // Assign the global switch ID
    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 = strdup(anno);
        int id = configuration_get_annotation_index(anno, anno_map);
        s->params = &all_params[id];
    }

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

   if(num_lps != (s->params->switch_radix[0]/2)) {
     tw_error(TW_LOC, "Number of NICs per repetition has to be equal to "
         "half the radix of leaf level switches %d vs %d\n", num_lps,
          s->params->switch_radix[0]/2);
   }
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   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;
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   s->switch_id = s->terminal_id / (s->params->switch_radix[0] / 2);
   codes_mapping_get_lp_id(lp_group_name, "fattree_switch", NULL, 1,
           s->switch_id, 0, &s->switch_lp);
   s->terminal_available_time = 0.0;
   s->packet_counter = 0;
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   s->terminal_msgs =
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     (fattree_message_list**)malloc(1*sizeof(fattree_message_list*));
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   s->terminal_msgs_tail =
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     (fattree_message_list**)malloc(1*sizeof(fattree_message_list*));

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   s->finished_msgs = 0;
   s->finished_chunks = 0;
   s->finished_packets = 0;
   s->total_time = 0.0;
   s->total_msg_size = 0;

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   s->last_buf_full = 0;
   s->busy_time = 0;

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#if FATTREE_HELLO
   printf("I am terminal %d (%ld), connected to switch %d\n", s->terminal_id,
       lp->gid, s->switch_id);
#endif
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   rc_stack_create(&s->st);

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   s->vc_occupancy = 0;
   s->terminal_msgs[0] = NULL;
   s->terminal_msgs_tail[0] = NULL;
   s->terminal_length = 0;
   s->in_send_loop = 0;
   s->issueIdle = 0;

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   s->rank_tbl = qhash_init(fattree_rank_hash_compare, fattree_hash_func, FTREE_HASH_TABLE_SIZE);
   if(!s->rank_tbl)
     tw_error(TW_LOC, "\n Hash table not initialized! ");

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   s->params->num_terminals = codes_mapping_get_lp_count(lp_group_name, 0,
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      LP_CONFIG_NM, s->anno, 0);
   return;
}

/* sets up the switch */
void switch_init(switch_state * r, tw_lp * lp)
{
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  uint32_t h1 = 0, h2 = 0;
  bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
  switch_magic_num = h1 + h2;

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  char anno[MAX_NAME_LENGTH];
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  int num_terminals = -1;
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  if(def_gname_set == 0) {
    def_gname_set = 1;
    codes_mapping_get_lp_info(0, def_group_name, &mapping_grp_id, NULL,
        &mapping_type_id, anno, &mapping_rep_id, &mapping_offset);
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    num_terminals = codes_mapping_get_lp_count(def_group_name, 0,
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      LP_CONFIG_NM, anno, 0);
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//    num_lps = codes_mapping_get_lp_count(def_group_name, 1, LP_CONFIG_NM,
//           anno, 0);
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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'){
    r->anno = NULL;
    r->params = &all_params[num_params-1];
  } else {
    r->anno = strdup(anno);
    int id = configuration_get_annotation_index(anno, anno_map);
    r->params = &all_params[id];
  }

  // shorthand
  fattree_param *p = r->params;
  if(mapping_offset == p->num_levels - 1) {
    if(mapping_rep_id >= p->num_switches[mapping_offset]) {
      r->unused = 1;
      return;
    }
  }

  r->unused = 0;

  r->switch_id = mapping_rep_id + mapping_offset * p->num_switches[0];

  if(num_terminals != -1) {
    p->num_terminals = num_terminals;
  }

  r->switch_level = mapping_offset;

  r->radix = p->switch_radix[r->switch_level];

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  r->next_output_available_time = (tw_stime*) malloc (r->radix *
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      sizeof(tw_stime));
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  r->next_credit_available_time = (tw_stime*) malloc (r->radix *
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      sizeof(tw_stime));
  r->vc_occupancy = (int*) malloc (r->radix * sizeof(int));
  r->in_send_loop = (int*) malloc (r->radix * sizeof(int));
  r->link_traffic = (int64_t*) malloc (r->radix * sizeof(int64_t));
  r->port_connections = (tw_lpid*) malloc (r->radix * sizeof(tw_lpid));
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  r->pending_msgs =
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    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
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  r->pending_msgs_tail =
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    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
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  r->queued_msgs =
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    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
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  r->queued_msgs_tail =
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    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
  r->queued_length = (int*)malloc(r->radix * sizeof(int));

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  r->last_buf_full = (tw_stime*)malloc(r->radix * sizeof(tw_stime));
  r->busy_time = (tw_stime*)malloc(r->radix * sizeof(tw_stime));
  r->busy_time_sample = (tw_stime*)malloc(r->radix * sizeof(tw_stime));

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  rc_stack_create(&r->st);

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  for(int i = 0; i < r->radix; i++)
  {
    // Set credit & switch occupancy
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    r->last_buf_full[i] = 0.0;
    r->busy_time[i] = 0.0;
    r->busy_time_sample[i] = 0.0;
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    r->next_output_available_time[i] = 0;
    r->next_credit_available_time[i] = 0;
    r->vc_occupancy[i] = 0;
    r->in_send_loop[i] = 0;
    r->link_traffic[i] = 0;
    r->pending_msgs[i] = NULL;
    r->pending_msgs_tail[i] = NULL;
    r->queued_msgs[i] = NULL;
    r->queued_msgs_tail[i] = NULL;
    r->queued_length[i] = 0;
  }

  //set lps connected to each port
  r->num_cons = 0;
  r->num_lcons = 0;
#if FATTREE_HELLO
  printf("I am switch %d (%d), level %d, radix %d\n", r->switch_id,
    lp->gid, r->switch_level, r->radix);
#endif
  //if at level 0, first half ports go to terminals
  if(r->switch_level == 0) {
    int start_terminal = r->switch_id * (p->switch_radix[0] / 2);
    int end_terminal = start_terminal + (p->switch_radix[0] / 2);
    for(int term = start_terminal; term < end_terminal; term++) {
      tw_lpid nextTerm;
      int rep = term / (p->switch_radix[0] / 2);
      int off = term % (p->switch_radix[0] / 2);
      codes_mapping_get_lp_id(def_group_name, LP_CONFIG_NM, NULL, 1,
          rep, off, &nextTerm);
      r->port_connections[r->num_cons++] = nextTerm;
      r->num_lcons++;
#if FATTREE_DEBUG
      printf("I am switch %d, connect to terminal %d (%d) at port %d\n",
          r->switch_id, term, nextTerm, r->num_cons - 1);
#endif
    }
    r->start_lneigh = start_terminal;
    r->end_lneigh = end_terminal;
    r->con_per_lneigh = 1;
    assert(r->num_lcons == (r->radix / 2));
    int l1_set;
    if(p->num_levels == 2) {
      l1_set = 0;
    } else {
      l1_set = r->switch_id / p->l1_set_size;
    }
    int l1_base = l1_set * p->l1_set_size;
    r->start_uneigh = p->num_switches[0] + l1_base;
    r->con_per_uneigh = 1;
    for(int l1 = 0; l1 < p->l1_set_size; l1++) {
      tw_lpid nextTerm;
      codes_mapping_get_lp_id(lp_group_name, "fattree_switch", NULL, 1,
          l1_base, 1, &nextTerm);
      for(int con = 0; con < r->con_per_uneigh; con++) {
        r->port_connections[r->num_cons++] = nextTerm;
#if FATTREE_DEBUG
      printf("I am switch %d, connect to upper switch %d L1 (%d) at port %d\n",
          r->switch_id, l1_base, nextTerm, r->num_cons - 1);
#endif
      }
      l1_base++;
    }
  } else if (r->switch_level == 1) {
    int l0_set_size, l0_base;
    if(p->num_levels == 2) {
      l0_set_size = p->num_switches[0];
      l0_base = 0;
      r->start_lneigh = 0;
      r->end_lneigh = p->num_switches[0];
    } else {
      l0_set_size = p->l1_set_size;
      l0_base = ((r->switch_id - p->num_switches[0]) / p->l1_set_size) *
        l0_set_size;
      r->start_lneigh = l0_base;
      r->end_lneigh = l0_base + l0_set_size;
    }
    r->con_per_lneigh = 1;
    for(int l0 = 0; l0 < l0_set_size; l0++) {
      tw_lpid nextTerm;
      codes_mapping_get_lp_id(def_group_name, "fattree_switch", NULL, 1,
          l0_base, 0, &nextTerm);
      for(int con = 0; con < r->con_per_lneigh; con++) {
        r->port_connections[r->num_cons++] = nextTerm;
        r->num_lcons++;
#if FATTREE_DEBUG
        printf("I am switch %d, connect to switch %d L0 (%d) at port %d\n",
            r->switch_id, l0_base, nextTerm, r->num_cons - 1);
#endif
      }
      l0_base++;
    }
    if(p->num_levels == 3) {
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      int l2_base = 0;
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      if(p->ft_type == 0) {
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//        int l2_base = 0;
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        /* not true anymore */
        r->start_uneigh = p->num_switches[0] + l2_base;
        r->con_per_uneigh = 1;
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        if(((int)r->switch_id - p->num_switches[0]) % p->l1_set_size >=
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            p->l1_set_size/2) {
          l2_base += (p->num_switches[2]/2);
        }
        for(int l2 = 0; l2 < p->num_switches[2]/2; l2++) {
          tw_lpid nextTerm;
          codes_mapping_get_lp_id(lp_group_name, "fattree_switch", NULL, 1,
              l2_base, 2, &nextTerm);
          for(int con = 0; con < r->con_per_uneigh; con++) {
            r->port_connections[r->num_cons++] = nextTerm;
#if FATTREE_DEBUG
            printf("I am switch %d, connect to upper switch %d L2 (%d) at port %d\n",
                r->switch_id, l2_base, nextTerm, r->num_cons - 1);
#endif
          }
          l2_base++;
        }
      } else {
        int l2 = ((r->switch_id - p->num_switches[0]) % p->l1_set_size);
        /* not true anymore */
        r->start_uneigh = p->num_switches[0] + l2;
        r->con_per_uneigh = 2;
        for(; l2 < p->num_switches[2]; l2 += p->l1_set_size) {
          tw_lpid nextTerm;
          codes_mapping_get_lp_id(lp_group_name, "fattree_switch", NULL, 1,
              l2, 2, &nextTerm);
          for(int con = 0; con < r->con_per_uneigh; con++) {
            r->port_connections[r->num_cons++] = nextTerm;
#if FATTREE_DEBUG
            printf("I am switch %d, connect to upper switch %d L2 (%d) at port %d\n",
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                r->switch_id, l2, nextTerm, r->num_cons - 1);
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#endif
          }
        }
      }
    }
  } else {
    if(p->ft_type == 0) {
      r->con_per_lneigh = 1;
      /* not true anymore */
      r->start_lneigh = p->num_switches[0];
      r->end_lneigh = r->start_lneigh + p->num_switches[1];
      int l1 = 0;
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      if((int)r->switch_id - p->num_switches[0] - p->num_switches[1] >=
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          (p->num_switches[2]/2)) {
        l1 += (p->l1_set_size/2);
      }
      int count = 0;
      for(; l1 < p->num_switches[1]; l1++) {
        tw_lpid nextTerm;
        codes_mapping_get_lp_id(lp_group_name, "fattree_switch", NULL, 1,
            l1, 1, &nextTerm);
        for(int con = 0; con < r->con_per_lneigh; con++) {
          r->port_connections[r->num_cons++] = nextTerm;
          r->num_lcons++;
#if FATTREE_DEBUG
          printf("I am switch %d, connect to  switch %d L1 (%d) at port %d\n",
              r->switch_id, l1, nextTerm, r->num_cons - 1);
#endif
        }
        count++;
        if(count == (p->l1_set_size/2)) {
          l1 += (p->l1_set_size/2);
          count = 0;
        }
      }
    } else {
      r->con_per_lneigh = 2;
      /* not true anymore */
      r->start_lneigh = p->num_switches[0];
      r->end_lneigh = r->start_lneigh + p->num_switches[1];
      int l1 = (r->switch_id - p->num_switches[0] - p->num_switches[1]) % p->l1_set_size;
      for(; l1 < p->num_switches[1]; l1 += p->l1_set_size) {
        tw_lpid nextTerm;
        codes_mapping_get_lp_id(lp_group_name, "fattree_switch", NULL, 1,
            l1, 1, &nextTerm);
        for(int con = 0; con < r->con_per_lneigh; con++) {
          r->port_connections[r->num_cons++] = nextTerm;
          r->num_lcons++;
#if FATTREE_DEBUG
          printf("I am switch %d, connect to  switch %d L1 (%d) at port %d\n",
              r->switch_id, l1, nextTerm, r->num_cons - 1);
#endif
        }
      }
    }
  }
  return;
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/* empty for now.. */
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static void fattree_report_stats()
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{
#if DEBUG_RC
	long long t_packet_event_f = 0;
	long long t_packet_event_r = 0;
	long long tt_generate_f = 0;
	long long tt_generate_r = 0;
	long long tt_send_f = 0;
	long long tt_send_r = 0;
	long long tt_arrive_f = 0;
	long long tt_arrive_r = 0;
	long long tt_buffer_f = 0;
	long long tt_buffer_r = 0;
	long long ts_send_f = 0;
	long long ts_send_r = 0;
	long long ts_arrive_f = 0;
	long long ts_arrive_r = 0;
	long long ts_buffer_f = 0;
	long long ts_buffer_r = 0;
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	MPI_Reduce( &packet_event_f, &t_packet_event_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &packet_event_r, &t_packet_event_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_generate_f, &tt_generate_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_generate_r, &tt_generate_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_send_f, &tt_send_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_send_r, &tt_send_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_arrive_f, &tt_arrive_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_arrive_r, &tt_arrive_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_buffer_f, &tt_buffer_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &t_buffer_r, &tt_buffer_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &s_send_f, &ts_send_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &s_send_r, &ts_send_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &s_arrive_f, &ts_arrive_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &s_arrive_r, &ts_arrive_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &s_buffer_f, &ts_buffer_f, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
	MPI_Reduce( &s_buffer_r, &ts_buffer_r, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);

   if(!g_tw_mynode)
   {
	printf("Reverse Computation Counters:\n");
	printf("packet_event_f:%llu\n",t_packet_event_f);
	printf("packet_event_r:%llu\n",t_packet_event_r);
	printf("t_gen_f:%llu\n",tt_generate_f);
	printf("t_gen_r:%llu\n",tt_generate_r);
	printf("t_gen_net:%llu\n",tt_generate_f-tt_generate_r);
	printf("t_send_f:%llu\n",tt_send_f);
	printf("t_send_r:%llu\n",tt_send_r);
	printf("t_send_net:%llu\n",tt_send_f-tt_send_r);
	printf("t_arrive_f:%llu\n",tt_arrive_f);
	printf("t_arrive_r:%llu\n",tt_arrive_r);
	printf("t_arrive_net:%llu\n",tt_arrive_f-tt_arrive_r);
	printf("t_buf_f:%llu\n",tt_buffer_f);
	printf("t_buf_r:%llu\n",tt_buffer_r);
	printf("t_buf_net:%llu\n",tt_buffer_f-tt_buffer_r);
	printf("s_send_f:%llu\n",ts_send_f);
	printf("s_send_r:%llu\n",ts_send_r);
	printf("s_send_net:%llu\n",ts_send_f-ts_send_r);
	printf("s_arrive_f:%llu\n",ts_arrive_f);
	printf("s_arrive_r:%llu\n",ts_arrive_r);
	printf("s_arrive_net:%llu\n",ts_arrive_f-ts_arrive_r);
	printf("s_buffer_f:%llu\n",ts_buffer_f);
	printf("s_buffer_r:%llu\n",ts_buffer_r);
	printf("s_buffer_net:%llu\n",ts_buffer_f-ts_buffer_r);
   }
#endif
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   long long avg_hops, total_finished_packets, total_finished_chunks;
   long long total_finished_msgs, final_msg_sz;
   tw_stime avg_time, max_time;
   long total_gen, total_fin;

   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( &N_finished_msgs, &total_finished_msgs, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &N_finished_chunks, &total_finished_chunks, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &total_msg_sz, &final_msg_sz, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &fattree_total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &fattree_max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
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   MPI_Reduce( &fattree_packet_gen, &total_gen, 1, MPI_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &fattree_packet_fin, &total_fin, 1, MPI_LONG, MPI_SUM, 0, MPI_COMM_WORLD);

   /* print statistics */
   if(!g_tw_mynode)
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   {
      printf(" Average number of hops traversed %f average chunk latency %lf us maximum chunk latency %lf us avg message size %lf bytes finished messages %lld finished chunks %lld \n",
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              (float)avg_hops/total_finished_chunks, avg_time/(total_finished_chunks*1000), max_time/1000, (float)final_msg_sz/total_finished_msgs, total_finished_msgs, total_finished_chunks);
      printf(" Total packets generated %ld finished %ld \n", total_gen, total_fin);
   }
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   if(!g_tw_mynode)
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   {
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      printf(" Average number of hops traversed %f average chunk latency %lf us maximum chunk latency %lf us avg message size %lf bytes finished messages %lld \n", (float)avg_hops/total_finished_chunks, avg_time/(total_finished_chunks*1000), max_time/1000, (float)final_msg_sz/total_finished_msgs, total_finished_msgs);

#if PARAMS_LOG
//    throughput_avg = throughput_avg / (float)slim_total_terminals_noah;
//    throughput_avg2 = throughput_avg2 / (float)slim_total_terminals_noah;

	//Open file to append simulation results
	char temp_filename[1024];
	char temp_filename_header[1024];
	sprintf(temp_filename,"%s/sim_log.txt",modelnet_stats_dir);
	sprintf(temp_filename_header,"%s/sim_log_header.txt",modelnet_stats_dir);
	FILE *fattree_results_log=fopen(temp_filename, "a");
	FILE *fattree_results_log_header=fopen(temp_filename_header, "a");
	if(fattree_results_log == NULL)
		printf("\n Failed to open results log file %s \n",temp_filename);
	if(fattree_results_log_header == NULL)
		printf("\n Failed to open results log header file %s \n",temp_filename_header);
	printf("Printing Simulation Parameters/Results Log File\n");
	fprintf(fattree_results_log_header,"<Avg Hops/Total Packets>, <Avg Time/Total Packets>, <Max Latency>, <Total Finished Chunks>");
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	fprintf(fattree_results_log,"%24.3lf, %24.3lf, %13.3lf, %23.3lld, ", (float)avg_hops/total_finished_packets, avg_time/(total_finished_packets),max_time,total_finished_chunks);
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	fclose(fattree_results_log_header);
	fclose(fattree_results_log);
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#endif
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  }
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}
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/* fattree packet event */
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static tw_stime fattree_packet_event(
        model_net_request const * req,
        uint64_t message_offset,
        uint64_t packet_size,
        tw_stime offset,
        mn_sched_params const * sched_params,
        void const * remote_event,
        void const * self_event,
        tw_lp *sender,
        int is_last_pckt)
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/*	model_net_request* req,
	char* category,
    tw_lpid final_dest_lp,
	uint64_t packet_size,
	int is_pull,
    uint64_t pull_size,
	tw_stime offset,
	const mn_sched_params *sched_params,
    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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*/{
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#if DEBUG_RC
  packet_event_f++;
#endif
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  (void)message_offset;
  (void)sched_params;
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  tw_event * e_new;
  tw_stime xfer_to_nic_time;
  fattree_message * msg;
  char* tmp_ptr;

  xfer_to_nic_time = codes_local_latency(sender);
  e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time + offset,
      sender, FATTREE, (void**)&msg, (void**)&tmp_ptr);
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  strcpy(msg->category, req->category);
  msg->final_dest_gid = req->final_dest_lp;
  msg->total_size = req->msg_size;
  msg->sender_lp = req->src_lp;
  msg->sender_mn_lp = sender->gid;
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  msg->packet_size = packet_size;
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  msg->travel_start_time = tw_now(sender);
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  msg->remote_event_size_bytes = 0;
  msg->local_event_size_bytes = 0;
  msg->type = T_GENERATE;
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  msg->dest_terminal_id = req->dest_mn_lp;
  msg->message_id = req->msg_id;
  msg->is_pull = req->is_pull;
  msg->pull_size = req->pull_size;
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  msg->magic = fattree_terminal_magic_num;
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  msg->msg_start_time = req->msg_start_time;
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  /* Its the last packet so pass in remote and local event information*/
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  if(is_last_pckt)
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  {
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    if(req->remote_event_size > 0)
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    {
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      msg->remote_event_size_bytes = req->remote_event_size;
      memcpy(tmp_ptr, remote_event, req->remote_event_size);
      tmp_ptr += req->remote_event_size;
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    }
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    if(req->self_event_size > 0)
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    {
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      msg->local_event_size_bytes = req->self_event_size;
      memcpy(tmp_ptr, self_event, req->self_event_size);
      tmp_ptr += req->self_event_size;
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    }
  }
  //printf("[%d] Send to %d\n", sender->gid, sender->gid);
  tw_event_send(e_new);
  return xfer_to_nic_time;
}

/* fattree packet event reverse handler */
static void fattree_packet_event_rc(tw_lp *sender)
{
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#if DEBUG_RC
  packet_event_r++;
#endif
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  codes_local_latency_reverse(sender);
  return;
}

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void ft_packet_generate_rc(ft_terminal_state * s, tw_bf * bf, fattree_message * msg, tw_lp * lp)
{
#if DEBUG_RC
    t_generate_r++;
#endif
    fattree_packet_gen--;
    s->packet_gen--;

    tw_rand_reverse_unif(lp->rng);

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

    if(!num_chunks)
	num_chunks = 1;

    int i;
    for(i = 0; i < num_chunks; i++) {
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	delete_fattree_message_list(return_tail(s->terminal_msgs,
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	    s->terminal_msgs_tail, 0));
	s->terminal_length -= s->params->chunk_size;
    }
    if(bf->c11) {
	s->issueIdle = 0;
	s->last_buf_full = msg->saved_busy_time;
    }
    if(bf->c5) {
	codes_local_latency_reverse(lp);
	s->in_send_loop = 0;
    }
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    struct mn_stats* stat;
    stat = model_net_find_stats(msg->category, s->fattree_stats_array);
    stat->send_count--;
    stat->send_bytes -= msg->packet_size;
    stat->send_time -= (1/s->params->cn_bandwidth) * msg->packet_size;
}

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/* generates packet at the current fattree compute node */
void ft_packet_generate(ft_terminal_state * s, tw_bf * bf, fattree_message * msg,
    tw_lp * lp) {
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  bf->c11 = 0;
  bf->c5 = 0;

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  fattree_packet_gen++;
  s->packet_gen++;
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  fattree_param *p = s->params;
  tw_stime ts, nic_ts;

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  int total_event_size;
  uint64_t num_chunks = msg->packet_size / p->chunk_size;
  if(msg->packet_size % s->params->chunk_size)
    num_chunks++;
  if(!num_chunks)
    num_chunks = 1;
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  nic_ts = g_tw_lookahead + (num_chunks * s->params->cn_delay) + tw_rand_unif(lp->rng);

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  msg->my_N_hop = 0;

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  msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter;
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//  msg->dest_terminal_id = msg->final_dest_gid;
  if(msg->packet_ID == LLU(TRACK_PKT))
    printf("\n Packet %llu generated at terminal %d terminal_gid %llu dest_terminal_id %llu final_dest_gid %llu size %llu num chunks %llu \n",
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       msg->packet_ID, s->terminal_id, LLU(lp->gid), LLU(msg->dest_terminal_id), LLU(msg->final_dest_gid),
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       LLU(msg->packet_size), LLU(num_chunks));

  for(uint64_t i = 0; i < num_chunks; i++)
  {
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    fattree_message_list * cur_chunk = (fattree_message_list *)malloc(
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      sizeof(fattree_message_list));
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    msg->origin_switch_id = s->switch_id;
    init_fattree_message_list(cur_chunk, msg);
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    if(msg->remote_event_size_bytes + msg->local_event_size_bytes > 0) {
      cur_chunk->event_data = (char*)malloc(
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        msg->remote_event_size_bytes + msg->local_event_size_bytes);
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    }
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    void *m_data_src = model_net_method_get_edata(FATTREE, msg);
    if(msg->remote_event_size_bytes){
      memcpy(cur_chunk->event_data, m_data_src, msg->remote_event_size_bytes);
    }
    if(msg->local_event_size_bytes){
      m_data_src = (char*)m_data_src + msg->remote_event_size_bytes;
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      memcpy((char*)cur_chunk->event_data + msg->remote_event_size_bytes,
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        m_data_src, msg->local_event_size_bytes);
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    }
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    cur_chunk->msg.chunk_id = i;
    cur_chunk->msg.origin_switch_id = s->switch_id;
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    append_to_fattree_message_list(s->terminal_msgs, s->terminal_msgs_tail,
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      0, cur_chunk);
    s->terminal_length += s->params->chunk_size;
  }
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//  if(s->terminal_id == 1)
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//    printf("gene time:%5.6lf lp_id:%3llu terminal_length:%5d \n",tw_now(lp),LLU(lp->gid),s->terminal_length);
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  if(s->terminal_length < 2 * s->params->cn_vc_size) {
    model_net_method_idle_event(nic_ts, 0, lp);
  } else {
    bf->c11 = 1;
    s->issueIdle = 1;
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    msg->saved_busy_time = s->last_buf_full;
    s->last_buf_full = tw_now(lp);
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  }

  if(s->in_send_loop == 0) {
    fattree_message *m;
    bf->c5 = 1;
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    ts = codes_local_latency(lp);
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    tw_event* e = model_net_method_event_new(lp->gid, ts, lp, FATTREE,
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      (void**)&m, NULL);
    m->type = T_SEND;
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    m->magic = fattree_terminal_magic_num;
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    s->in_send_loop = 1;
    tw_event_send(e);
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    //printf("[%d] send loop triggered with ts %lf band %lf\n",
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    // lp->gid, ts, s->params->cn_bandwidth);
  }

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  total_event_size = model_net_get_msg_sz(FATTREE) +
    msg->remote_event_size_bytes+ msg->local_event_size_bytes;
  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->fattree_stats_array);
  stat->send_count++;
  stat->send_bytes += msg->packet_size;
  stat->send_time += (1/p->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;
}

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void ft_packet_send_rc(ft_terminal_state * s, tw_bf *bf, fattree_message * msg, tw_lp * lp)
{
#if DEBUG_RC
    t_send_r++;
#endif
    if(bf->c1) {
      s->in_send_loop = 1;
      s->last_buf_full = msg->saved_busy_time;
      return;
    }

    tw_rand_reverse_unif(lp->rng);
    s->terminal_available_time = msg->saved_available_time;
    if(bf->c2) {
      codes_local_latency_reverse(lp);
    }
    s->packet_counter--;
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    s->vc_occupancy -= s->params->chunk_size;
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    fattree_message_list* cur_entry = rc_stack_pop(s->st);
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    prepend_to_fattree_message_list(s->terminal_msgs,
	s->terminal_msgs_tail, 0, cur_entry);
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    s->terminal_length += s->params->chunk_size;
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    if(s->terminal_id == 0)
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       printf("time:%lf terminal_length:%d \n",tw_now(lp),s->terminal_length);

    if(bf->c3) {
      tw_rand_reverse_unif(lp->rng);
    }
    if(bf->c4) {
      s->in_send_loop = 1;
    }
    /*if(bf->c5) {
      codes_local_latency_reverse(lp);
      s->issueIdle = 1;
    }*/
}
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/* sends the packet from the compute node to the attached switch */
void ft_packet_send(ft_terminal_state * s, tw_bf * bf, fattree_message * msg,
    tw_lp * lp) {

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  bf->c1 = 0;
  bf->c2 = 0;
  bf->c3 = 0;
  bf->c4 = 0;
  bf->c5 = 0;

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  tw_stime ts;
  tw_event *e;
  fattree_message *m;
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  fattree_message_list* cur_entry = s->terminal_msgs[0];

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  if(s->vc_occupancy + s->params->chunk_size > s->params->cn_vc_size ||
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    cur_entry == NULL) {
    bf->c1 = 1;
    s->in_send_loop = 0;
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    msg->saved_busy_time = s->last_buf_full;
    s->last_buf_full = tw_now(lp);
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    return;
  }

  //  Each packet is broken into chunks and then sent over the channel
  msg->saved_available_time = s->terminal_available_time;
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    + g_tw_lookahead * tw_rand_unif(lp->rng);
  s->terminal_available_time = maxd(s->terminal_available_time, tw_now(lp));
  s->terminal_available_time += ts;

  // we are sending an event to the switch, so no method_event here
  ts = s->terminal_available_time - tw_now(lp);
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  e = tw_event_new(s->switch_lp, ts, lp);
  m = tw_event_data(e);
  memcpy(m, &cur_entry->msg, sizeof(fattree_message));
  if (m->remote_event_size_bytes){
    memcpy(model_net_method_get_edata(FATTREE, m), cur_entry->event_data,
        m->remote_event_size_bytes);
  }

  m->type = S_ARRIVE;
  m->src_terminal_id = lp->gid;
  m->intm_id = s->terminal_id;
  m->vc_index = 0;
  m->vc_off = 0; //we only have one connection to the terminal NIC
  m->local_event_size_bytes = 0;
  m->last_hop = TERMINAL;
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  tw_event_send(e);
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  uint64_t num_chunks = cur_entry->msg.packet_size/s->params->chunk_size;
  if(cur_entry->msg.packet_size % s->params->chunk_size)
    num_chunks++;

  if(!num_chunks)
      num_chunks = 1;

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  if(cur_entry->msg.chunk_id == num_chunks - 1 && (cur_entry->msg.local_event_size_bytes > 0))
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  {
    bf->c2 = 1;
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    double tsT = codes_local_latency(lp);
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    tw_event *e_new = tw_event_new(cur_entry->msg.sender_lp, tsT, lp);
    fattree_message *m_new = tw_event_data(e_new);
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                cur_entry->msg.remote_event_size_bytes;
    memcpy(m_new, local_event, cur_entry->msg.local_event_size_bytes);
    tw_event_send(e_new);
  }
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  s->packet_counter++;
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  s->vc_occupancy += s->params->chunk_size;