fattree.c 67.9 KB
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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"
#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/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 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

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

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//Delete the following enum and struct after getting fattree up and running
enum svr_tmp_event
{
    KICKOFF,	   /* kickoff event */
    REMOTE,        /* remote event */
    LOCAL      /* local event */
};
typedef struct tmp_svr tmp_svr;
struct tmp_svr
{
    enum svr_tmp_event svr_event_type;
    tw_lpid src;          /* source of this request or ack */
    int incremented_flag; /* helper for reverse computation */
};

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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
static double MEAN_INTERVAL=200.0;

typedef struct fattree_param fattree_param;
/* annotation-specific parameters (unannotated entry occurs at the 
 * last index) */
static uint64_t                  num_params = 0;
static fattree_param           * all_params = NULL;
static config_anno_map_t * anno_map   = NULL;

/* 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;
};

void init_fattree_message_list(fattree_message_list *this, 
  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 */
  double cn_bandwidth;/* bandwidth of the compute node channels 
                        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; 
  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;
 
     /* 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;
 
     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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  /* For sampling */
  long fin_chunks_sample;
  long data_size_sample;
  double fin_hops_sample;
  tw_stime fin_chunks_time;
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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;
  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;

  char * anno;
  fattree_param *params;
};

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static tw_stime         fattree_total_time = 0;
static tw_stime         fattree_max_latency = 0;
static tw_stime         max_collective = 0;


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

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

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

static void create_prepend_to_fattree_message_list(
        fattree_message_list ** thisq,
        fattree_message_list ** thistail,
        int index, 
        fattree_message *msg) {
    fattree_message_list* new_entry = (fattree_message_list*)malloc(
        sizeof(fattree_message_list));
    init_fattree_message_list(new_entry, msg);
    if(msg->remote_event_size_bytes) {
        void *m_data = model_net_method_get_edata(FATTREE, msg);
        new_entry->event_data = (void*)malloc(msg->remote_event_size_bytes);
        memcpy(new_entry->event_data, m_data, msg->remote_event_size_bytes);
    }
    prepend_to_fattree_message_list( thisq, thistail, index, new_entry);
}

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;
}

static void copy_fattree_list_entry( fattree_message_list *cur_entry,
    fattree_message *msg) {
    fattree_message *cur_msg = &cur_entry->msg;
    msg->packet_ID = cur_msg->packet_ID;    
    strcpy(msg->category, cur_msg->category);
    msg->final_dest_gid = cur_msg->final_dest_gid;
    msg->sender_lp = cur_msg->sender_lp;
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    msg->dest_terminal_id = cur_msg->dest_terminal_id;
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    msg->src_terminal_id = cur_msg->src_terminal_id;
    msg->intm_lp_id = cur_msg->intm_lp_id;
    msg->saved_vc = cur_msg->saved_vc;
    msg->saved_off = cur_msg->saved_off;
    msg->last_hop = cur_msg->last_hop;
    msg->intm_id = cur_msg->intm_id;
    msg->vc_index = cur_msg->vc_index;
    msg->vc_off = cur_msg->vc_off;
    msg->packet_size = cur_msg->packet_size;
    msg->msg_size = cur_msg->msg_size;
    msg->src_nic = cur_msg->src_nic;
    msg->uniq_id = cur_msg->uniq_id;
    msg->saved_size = cur_msg->saved_size;
    msg->local_event_size_bytes = cur_msg->local_event_size_bytes;
    msg->remote_event_size_bytes = cur_msg->remote_event_size_bytes;

    if(msg->local_event_size_bytes +  msg->remote_event_size_bytes > 0) {
        void *m_data = model_net_method_get_edata(FATTREE, msg);
        memcpy(m_data, cur_entry->event_data, 
            msg->local_event_size_bytes +  msg->remote_event_size_bytes);
    }
}

//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 */
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);
}

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

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

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

  configuration_get_value_int(&config, "PARAMS", "cn_vc_size", anno, 
      &p->cn_vc_size);
  if(!p->cn_vc_size) {
    p->cn_vc_size = 8*p->packet_size;
    fprintf(stderr, "Buffer size of compute node channels not specified, " 
        "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, 
      &p->link_bandwidth);
  if(!p->link_bandwidth) {
    p->link_bandwidth = 5;
    fprintf(stderr, "Bandwidth of links is specified, setting to %lf\n", 
        p->link_bandwidth);
  }

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

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

  for (uint64_t i = 0; i < anno_map->num_annos; i++){
    char * anno = anno_map->annotations[i].ptr;
    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_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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    int i;
    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);
   }
   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;  
   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;
   s->terminal_msgs = 
     (fattree_message_list**)malloc(1*sizeof(fattree_message_list*));
   s->terminal_msgs_tail = 
     (fattree_message_list**)malloc(1*sizeof(fattree_message_list*));

#if FATTREE_HELLO
   printf("I am terminal %d (%ld), connected to switch %d\n", s->terminal_id,
       lp->gid, s->switch_id);
#endif
   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, 
      LP_CONFIG_NM, s->anno, 0);
   return;
}

/* sets up the switch */
void switch_init(switch_state * r, tw_lp * lp)
{
  char anno[MAX_NAME_LENGTH];
  int num_terminals = -1, num_lps;

  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);
    num_terminals = codes_mapping_get_lp_count(def_group_name, 0, 
      LP_CONFIG_NM, anno, 0);
    num_lps = codes_mapping_get_lp_count(def_group_name, 1, LP_CONFIG_NM,
           anno, 0);
  }

  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];

  r->next_output_available_time = (tw_stime*) malloc (r->radix * 
      sizeof(tw_stime));
  r->next_credit_available_time = (tw_stime*) malloc (r->radix * 
      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));
  r->pending_msgs = 
    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
  r->pending_msgs_tail = 
    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
  r->queued_msgs = 
    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
  r->queued_msgs_tail = 
    (fattree_message_list**)malloc(r->radix * sizeof(fattree_message_list*));
  r->queued_length = (int*)malloc(r->radix * sizeof(int));

  for(int i = 0; i < r->radix; i++)
  {
    // Set credit & switch occupancy
    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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        /* not true anymore */
        r->start_uneigh = p->num_switches[0] + l2_base;
        r->con_per_uneigh = 1;
        if((r->switch_id - p->num_switches[0]) % p->l1_set_size >=
            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;
      if(r->switch_id - p->num_switches[0] - p->num_switches[1] >=
          (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;
}	

/* empty for now.. */
static void fattree_report_stats() { }

/* 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)
/*	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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  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*/
  if(is_last_pckt) 
  {
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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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      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)
{
  codes_local_latency_reverse(sender);
  return;
}

/* 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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  fattree_packet_gen++;
  s->packet_gen++;
  
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  fattree_param *p = s->params;
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