network-graph.C 75.1 KB
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#include <ross.h>

#include "codes/jenkins-hash.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"

//CHANGE: use the network file created
#include "codes/net/network-graph.h"

#include "codes/net/common-net.h"
#include "sys/file.h"
#include "codes/quickhash.h"
#include "codes/rc-stack.h"
#include <vector>
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#include <string>
#include <map>
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#include <graphviz/cgraph.h>
#include <cstdio>
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#include <search.h>
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#define CREDIT_SZ 8
#define HASH_TABLE_SIZE 4999

#define DEBUG 0
#define MAX_STATS 65536

//CHANGE: define them for the local network
#define LOCAL_NETWORK_NAME NETWORK_GRAPH
#define LOCAL_NETWORK_ROUTER_NAME NETWORK_GRAPH_ROUTER
#define LOCAL_MSG_STRUCT network_graph_message
#define LOCAL_MSG_NAME_FROM_UNION net_graph_msg

#define LP_CONFIG_NM_TERM (model_net_lp_config_names[LOCAL_NETWORK_NAME])
#define LP_METHOD_NM_TERM (model_net_method_names[LOCAL_NETWORK_NAME])
#define LP_CONFIG_NM_ROUT (model_net_lp_config_names[LOCAL_NETWORK_ROUTER_NAME])
#define LP_METHOD_NM_ROUT (model_net_method_names[LOCAL_NETWORK_ROUTER_NAME])

static long packet_gen = 0, packet_fin = 0;

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

typedef struct local_param local_param;
static uint64_t                  num_params = 0;
static local_param         * all_params = NULL;
static const config_anno_map_t * anno_map   = NULL;

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

/* router magic number */
static int router_magic_num = 0;

/* terminal magic number */
static int terminal_magic_num = 0;

static int sample_bytes_written = 0;
static int sample_rtr_bytes_written = 0;

static char local_cn_sample_file[MAX_NAME_LENGTH];
static char local_rtr_sample_file[MAX_NAME_LENGTH];

static char network_graph_file[MAX_NAME_LENGTH];

static void init_message_list(message_list *thism,
    LOCAL_MSG_STRUCT *inmsg) {
  thism->LOCAL_MSG_NAME_FROM_UNION = *inmsg;
  thism->event_data = NULL;
  thism->next = NULL;
  thism->prev = NULL;
  thism->in_alt_q = 0;
  thism->altq_next = NULL;
  thism->altq_prev = NULL;
}

class End {
  public:
  int port;
  int id;
  bool isTerm;

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  End() {}
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  End(int _port, int _id, bool _isTerm) {
    port = _port;
    id = _id;
    isTerm = _isTerm;
  }
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  ~End() {}
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};
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class Switch_info {
  public:
  std::string name;
  long long guid;
  int radix;
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  std::vector<End> ports;
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  ~Switch_info() {}
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};

class Terminal_info {
  public:
  std::string name;
  long long guid;
  int radix;
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  std::vector<End> ports;
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  ~Terminal_info() {}
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};

struct local_param
{
  double link_bandwidth;/* bandwidth of each link */
  double cn_bandwidth;/* injection bandwidth */
  int num_vcs; /* number of virtual channels */
  int vc_size; /* buffer size of the router-router channels */
  int cn_vc_size; /* buffer size of the compute node channels */
  int chunk_size; /* full-sized packets are broken into smaller chunks.*/
  int router_delay; /* delay at each router */
  int routing; /* type of routing */

  //derived param
  double cn_delay; /* bandwidth based time for 1 byte */
  double link_delay; /* bandwidth based time for 1 byte */
  double credit_delay; /* how long for credit to arrive - all bytes */

  //CHANGE: add network specific data here
  int num_switches, num_terminals;
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  std::vector<Switch_info> switch_id_to_info;
  std::vector<Terminal_info> term_id_to_info;
  std::map<long long, int> switch_guid_to_id, term_guid_to_id;
  std::map<std::string, int> switch_name_to_id, term_name_to_id;
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};

struct local_router_sample
{
  tw_lpid router_id;
  tw_stime* busy_time;
  int64_t* link_traffic_sample;
  tw_stime end_time;
  long fwd_events;
  long rev_events;
};

struct local_cn_sample
{
  tw_lpid terminal_id;
  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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  tw_stime end_time;
  long fwd_events;
  long rev_events;
};

/* handles terminal and router events like packet generate/send/receive/buffer */
typedef struct terminal_state terminal_state;
typedef struct router_state router_state;

/* compute node data (think NIC) structure */
struct terminal_state
{
  unsigned int terminal_id; //what is my local id
  const char * anno;
  const local_param *params;

  int radix; //my radix

  //which router I am connected to
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  std::vector<tw_lpid> conn_gids;
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  // Each terminal will have input/output channel(s) with the router
  int** vc_occupancy; // NUM_VC
  tw_stime *terminal_available_time;

  //available messages to be sent
  message_list ***terminal_msgs;
  message_list ***terminal_msgs_tail;
  int *total_terminal_length;
  int **terminal_length;
  int *in_send_loop;
  int issueIdle;

  //packet aggregation
  struct qhash_table *rank_tbl;
  //transient storage for reverse computation
  struct rc_stack * st;

  //stats collection
  uint64_t packet_counter;
  int packet_gen;
  int packet_fin;
  struct mn_stats local_stats_array[CATEGORY_MAX];
  tw_stime   total_time;
  uint64_t total_msg_size;
  double total_hops;
  long finished_msgs;
  long finished_chunks;
  long finished_packets;

  //sampling
  tw_stime *last_buf_full;
  tw_stime *busy_time;
  char output_buf[4096];
  long fin_chunks_sample;
  long data_size_sample;
  double fin_hops_sample;
  tw_stime fin_chunks_time;
  tw_stime *busy_time_sample;
  char sample_buf[4096];
  struct local_cn_sample * sample_stat;
  int op_arr_size;
  int max_arr_size;
  /* for logging forward and reverse events */
  long fwd_events;
  long rev_events;
  
  int *lft;
};

//CHANGE: may need to change if more functionality is desired
/* event types */
enum event_t
{
  T_GENERATE=1,
  T_ARRIVE,
  T_SEND,
  T_BUFFER,
  R_SEND,
  R_ARRIVE,
  R_BUFFER,
};
typedef enum event_t event_t;

//CHANGE: may need to change if more functionality is desired
/* whether the last hop of a packet was global, local or a terminal */
enum last_hop
{
  ROUTER=1,
  TERMINAL
};

//CHANGE: may need to change if more functionality is desired
enum ROUTING_ALGO
{
  STATIC = 0,
  ADAPTIVE,
};

static char routing_folder[MAX_NAME_LENGTH];

struct router_state
{
  //who am I
  unsigned int router_id;
  const char * anno;
  const local_param *params;
  int radix;

  //CHANGE: may need to be changed if linear storage is not desired
  //array/linked list based storage of info about ports/vcs
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  std::vector<tw_lpid> conn_gids;
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  tw_stime* next_output_available_time;
  message_list ***pending_msgs;
  message_list ***pending_msgs_tail;
  message_list ***queued_msgs;
  message_list ***queued_msgs_tail;
  int** vc_occupancy;
  int *in_send_loop;
  int *queued_count;

  //for reverse computation
  struct rc_stack * st;

  //sampling and stats
  int64_t* link_traffic;
  tw_stime* last_buf_full;
  tw_stime* busy_time;
  tw_stime* busy_time_sample;
  struct local_router_sample * rsamples;
  int op_arr_size;
  int max_arr_size;
  long fwd_events, rev_events;
  int64_t * link_traffic_sample;
  char output_buf[4096];
  char output_buf2[4096];

  //CHANGE: add network specific data here
  int *lft;
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  int unused;
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};

struct VC_Entry {
  int vc;
  message_list* entry;
};

//global stats
static tw_stime         local_total_time = 0;
static tw_stime         local_max_latency = 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;

/* returns the message size */
static int local_get_msg_sz(void)
{
  return sizeof(LOCAL_MSG_STRUCT);
}

//CHANGE: network specific params have to be read here
static void local_read_config(const char * anno, local_param *params){
  local_param *p = params;

  // general params - do not change unless you intent to modify them
  int rc = configuration_get_value_double(&config, "PARAMS", "link_bandwidth",
      anno, &p->link_bandwidth);
  if(rc) {
    p->link_bandwidth = 5.25;
    fprintf(stderr, "Bandwidth of links  not specified, setting to %lf\n",
        p->link_bandwidth);
  }

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

  rc = configuration_get_value_int(&config, "PARAMS", "num_vcs", anno,
      &p->num_vcs);
  if(rc) {
    p->num_vcs = 1;
  }

  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 not specified, setting to %d\n",
      p->chunk_size);
  }

  rc = configuration_get_value_int(&config, "PARAMS", "vc_size", anno,
      &p->vc_size);
  if(rc) {
    p->vc_size = 32768;
    fprintf(stderr, "Buffer size of link channels not specified, setting to %d\n",
      p->vc_size);
  }

  rc = configuration_get_value_int(&config, "PARAMS", "cn_vc_size", anno,
      &p->cn_vc_size);
  if(rc) {
    p->cn_vc_size = 65536;
    fprintf(stderr, "Buffer size of compute node channels not specified, "
        "setting to %d\n", p->cn_vc_size);
  }
  
  char routing_str[MAX_NAME_LENGTH];
  configuration_get_value(&config, "PARAMS", "routing", anno, routing_str,
      MAX_NAME_LENGTH);
  if(strcmp(routing_str, "static") == 0) {
    p->routing = STATIC;
  } else {
    p->routing = STATIC;
  }
  if(!g_tw_mynode) printf("Routing is %d\n", p->routing);
  
  routing_folder[0] = '\0';
  rc = configuration_get_value(&config, "PARAMS", "routing_folder", anno, routing_folder,
      MAX_NAME_LENGTH);

  if(routing_folder[0] == '\0') {
    if(p->routing == STATIC) {
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      tw_error(TW_LOC, "routing_folder has to be provided with static routing");
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    }
  }

  p->router_delay = 50;
  configuration_get_value_int(&config, "PARAMS", "router_delay", anno,
      &p->router_delay);

  configuration_get_value(&config, "PARAMS", "cn_sample_file", anno,
      local_cn_sample_file, MAX_NAME_LENGTH);
  configuration_get_value(&config, "PARAMS", "rt_sample_file", anno,
      local_rtr_sample_file, MAX_NAME_LENGTH);
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  //CHANGE: add network specific parameters here
  rc = configuration_get_value_int(&config, "PARAMS", "num_switches", anno,
      &p->num_switches);

  rc = configuration_get_value_int(&config, "PARAMS", "num_terminals", anno,
      &p->num_terminals);
  
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  printf("s %d t %d\n", p->num_switches, p->num_terminals);
  
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  p->switch_id_to_info.resize(p->num_switches);
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  p->term_id_to_info.resize(p->num_terminals);
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  configuration_get_value(&config, "PARAMS", "network_graph_file", anno,
      network_graph_file, MAX_NAME_LENGTH);
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  printf("Open %s\n", network_graph_file);
  fflush(stdout);
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  FILE *input_file = fopen(network_graph_file, "r");
  Agraph_t *input_graph = agread(input_file, NULL);

  int num_switches = 0, num_terminals = 0;

  Agnode_t *g_node;
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  Agedge_t    *e;
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  printf("About to read %s\n", network_graph_file);
  fflush(stdout);
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  for(g_node = agfstnode(input_graph); g_node; g_node = agnxtnode(input_graph, g_node)) {
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    char *name = agnameof(g_node);
    if(name[0] == 'S') {
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      Switch_info next_switch;
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      next_switch.name = std::string(name);
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      p->switch_name_to_id[next_switch.name] = num_switches;
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      char * comment = agget(g_node, "comment");
      std::string  comment_str(comment);
      if(comment_str.find("root_switch") == std::string::npos ||
        (comment_str.find("root_switch") > comment_str.find("radix")))  {
        sscanf(comment, "%x,radix=%d", &next_switch.guid, &next_switch.radix);
      } else {
        sscanf(comment, "%x,root_switch,radix=%d", &next_switch.guid, &next_switch.radix);
      }
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      p->switch_id_to_info[num_switches] = next_switch;
      p->switch_id_to_info[num_switches].ports.resize(next_switch.radix);
      p->switch_guid_to_id[next_switch.guid] = num_switches;
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      num_switches++;
    }
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    if(name[0] == 'H') {
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      Terminal_info next_term;
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      next_term.name = std::string(name);
      int term_id;
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      sscanf(name, "H<%d", &term_id);
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      p->term_name_to_id[next_term.name] = term_id;
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      char * comment = agget(g_node, "comment"); 
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      std::string  comment_str(comment);
      if(comment_str.find("radix") == std::string::npos)  {
        sscanf(comment, "%x", &next_term.guid);
        next_term.radix = 1;
      } else {
        sscanf(comment, "%x,radix=%d", &next_term.guid, &next_term.radix);
      }
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      p->term_id_to_info[term_id] = next_term;
      p->term_id_to_info[term_id].ports.resize(next_term.radix);
      p->term_guid_to_id[next_term.guid] = term_id;
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      if(term_id > num_terminals) num_terminals = term_id;
    }
  }
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  printf("Read %s\n", network_graph_file);
  fflush(stdout);
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  assert(num_terminals == p->num_terminals);
  assert(num_switches == p->num_switches);
      
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  for(g_node = agfstnode(input_graph); g_node; g_node = agnxtnode(input_graph, g_node)) {
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    char *name = agnameof(g_node);
    int index_in_info;
    if(name[0] == 'S') {
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      index_in_info = p->switch_name_to_id[std::string(name)];
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    } else {
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      index_in_info = p->term_name_to_id[std::string(name)];
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    }
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    for (e = agfstedge(input_graph,g_node); e; e = agnxtedge(input_graph,e,g_node)) {
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      char *partner = agnameof(e->node);
      char *edge_comment = agget(e, "comment");
      int srcPort, dstPort;
      sscanf(edge_comment, "P%d->P%d", &srcPort, &dstPort);
      int dstId; bool isTerm;
      if(partner[0] == 'S') {
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        dstId = p->switch_name_to_id[std::string(partner)];
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        isTerm = false; 
      } else {
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        dstId = p->term_name_to_id[std::string(partner)];
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        isTerm = true;
      }
      if(name[0] == 'S') {
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       p->switch_id_to_info[index_in_info].ports[srcPort-1] = End(dstPort-1, dstId, isTerm);
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      } else {
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       p->term_id_to_info[index_in_info].ports[srcPort-1] = End(dstPort-1, dstId, isTerm);
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      }
    }
  }

  agclose(input_graph);
  fclose(input_file);

  //CHANGE: derived parameters often are computed based on network specifics

  //general derived parameters
  p->cn_delay = bytes_to_ns(1, p->cn_bandwidth);
  p->link_delay = bytes_to_ns(1, p->link_bandwidth);
  p->credit_delay = 50; //using a constant

  uint32_t h1 = 0, h2 = 0;
  bj_hashlittle2(LP_METHOD_NM_TERM, strlen(LP_METHOD_NM_TERM), &h1, &h2);
  terminal_magic_num = h1 + h2;

  bj_hashlittle2(LP_METHOD_NM_ROUT, strlen(LP_METHOD_NM_ROUT), &h1, &h2);
  router_magic_num = h1 + h2;

}

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

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

/* report statistics like average and maximum packet latency, average number of hops traversed */
static void local_report_stats()
{
  long long avg_hops, total_finished_packets, total_finished_chunks;
  long long total_finished_msgs, final_msg_sz;
  tw_stime avg_time, max_time;
  int total_minimal_packets, total_nonmin_packets;
  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( &local_total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0,
      MPI_COMM_WORLD);
  MPI_Reduce( &local_max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0,
      MPI_COMM_WORLD);

  MPI_Reduce( &packet_gen, &total_gen, 1, MPI_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
  MPI_Reduce( &packet_fin, &total_fin, 1, MPI_LONG, MPI_SUM, 0, MPI_COMM_WORLD);

  /* print statistics */
  if(!g_tw_mynode)
  {
    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",
      (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("\n Total packets generated %ld finished %ld \n", total_gen, total_fin);
  }
  return;
}

/* parse external file with give forwarding tables
 * file name: 0x<guid>.lft
 * content: '0x<terminal guid> <egress port>' per line, e.g.:
 * `head 0x0000000100000000.lf`
 *    0x0000000100000000 0
 *    0x00000040000000ff 22
 *    0x0000000100000001 19
 */
typedef struct {
  uint64_t guid;
  uint64_t port;
} guid_port_combi_t;

static int cmp_guids(const void *g1, const void *g2)
{
  uint64_t guid1 = *((uint64_t *) g1);
  uint64_t guid2 = ((guid_port_combi_t *) g2)->guid;
  if (guid1 == guid2)
    return 0;
  else
    return 1;
}

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static int read_static_lft(long long guid, int * &lft, const local_param * params)
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{
  char dir_name[512];
  char file_name[512];

  char *io_dir = routing_folder;
  sprintf(dir_name, "%s", io_dir);

  sprintf(file_name, "%s/0x%016"PRIx64".lft", dir_name, guid);
  FILE *file = NULL;
  if (!(file = fopen(file_name, "r")))
    return -1;

  char line[UINT8_MAX];
  char *p = NULL, *e = NULL;
  uint64_t dest_guid = 0, port = 0;

  int num_added = 0;
  //temp storage for the entire table
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  guid_port_combi_t *tmpLFT = (guid_port_combi_t*)calloc(params->num_terminals + params->num_switches, sizeof(guid_port_combi_t));
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  //storage for port to take for the destination terminal
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  lft = (int*)malloc(params->num_terminals * sizeof(int));
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  /* init all with -1 so that we find missing routing entries */
  for (int i = 0; i < params->num_terminals; i++) lft[i] = -1;

  while (fgets(line, sizeof(line), file)) {
    p = line;
    while (isspace(*p))
      p++;

    if (*p == '\0' || *p == '\n' || *p == '#')
      continue;

    dest_guid = strtoull(p, &e, 16);
    if (e == p || (!isspace(*e) && *e != '#' && *e != '\0')) {
      errno = EINVAL;
      return -1;
    }

    p = e;
    while (isspace(*p))
      p++;

    port = strtoull(p, &e, 0);
    if (e == p || (!isspace(*e) && *e != '#' && *e != '\0')) {
      errno = EINVAL;
      return -1;
    }

    tmpLFT[num_added].guid = dest_guid;
    tmpLFT[num_added].port = port;
    num_added++;
  }

  /* we want a real LFT with terminal_id as lookup index, so have to
   * convert the read lft, which might contain entries for switches
   * or is permutated, into the correct format
   */
  for (int dest_num = 0; dest_num < params->num_terminals; dest_num++) {
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    uint64_t key = params->term_id_to_info[dest_num].guid;
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    size_t size = params->num_terminals + params->num_switches;
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    guid_port_combi_t *elem = (guid_port_combi_t*)lfind(&key, tmpLFT, &size,
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          sizeof(guid_port_combi_t), cmp_guids);
    assert(elem);
    lft[dest_num] = elem->port - 1;
  }

#if FATTREE_DEBUG
  printf("I am guid=%016"PRIx64") and my LFT is:\n", guid);
  for (int dest_num = 0; dest_num < params->num_terminals; dest_num++)
     printf("\tdest %d -> egress port %d\n", dest_num, lft[dest_num]);
#endif

  free(tmpLFT);
  fclose(file);
  return 0;
}

/* initialize a compute node terminal */
static void terminal_init( terminal_state * s, tw_lp * lp )
{
  int i;
  char anno[MAX_NAME_LENGTH];

  s->packet_gen = 0;
  s->packet_fin = 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') {
    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, 0, LP_CONFIG_NM_TERM,
      s->anno, 0);

  s->terminal_id = codes_mapping_get_lp_relative_id(lp->gid, 0, 0);

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  const Terminal_info &my_info = s->params->term_id_to_info[s->terminal_id]; 
  s->radix = my_info.radix;
  s->conn_gids.resize(s->radix);
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  for(int port = 0; port < s->radix; port++) {
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    const End &next_port = my_info.ports[port];
    if(next_port.isTerm) {
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      s->conn_gids[port] = codes_mapping_get_lpid_from_relative(next_port.id, 
          NULL, LP_CONFIG_NM_TERM, s->anno, 1);
    } else {
      s->conn_gids[port] = codes_mapping_get_lpid_from_relative(next_port.id, 
          NULL, LP_CONFIG_NM_ROUT, s->anno, 1);
    }
  }

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



  s->fwd_events = 0;
  s->rev_events = 0;

  rc_stack_create(&s->st);

  s->rank_tbl = qhash_init(mn_rank_hash_compare, mn_hash_func, HASH_TABLE_SIZE);

  if(!s->rank_tbl)
    tw_error(TW_LOC, "\n Hash table not initialized! ");

  s->terminal_msgs = (message_list ***)malloc(s->radix * sizeof(message_list**));
  s->terminal_msgs_tail = (message_list ***)malloc(s->radix * sizeof(message_list**));
  s->vc_occupancy = (int **)malloc(s->radix * sizeof(int*));
  s->total_terminal_length = (int *)malloc(s->radix * sizeof(int));
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  s->terminal_length = (int **)malloc(s->radix * sizeof(int*));
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  s->in_send_loop = (int *)malloc(s->radix * sizeof(int));
  s->terminal_available_time = (tw_stime*)malloc(s->radix * sizeof(tw_stime));
  s->last_buf_full = (tw_stime*)malloc(s->radix * sizeof(tw_stime));
  s->busy_time = (tw_stime*)malloc(s->radix * sizeof(tw_stime));
  s->busy_time_sample = (tw_stime*)malloc(s->radix * sizeof(tw_stime));
  for(int port = 0; port < s->radix; port++) {
    s->terminal_msgs[port] =
      (message_list **)malloc(s->params->num_vcs * sizeof(message_list*));
    s->terminal_msgs_tail[port] =
      (message_list **)malloc(s->params->num_vcs * sizeof(message_list*));
    s->vc_occupancy[port] = (int*)malloc(s->params->num_vcs * sizeof(int));
    s->terminal_length[port] = (int*)malloc(s->params->num_vcs * sizeof(int));
    for(i = 0; i < s->params->num_vcs; i++ ) {
      s->terminal_msgs[port][i] = NULL;
      s->terminal_msgs_tail[port][i] = NULL;
      s->vc_occupancy[port][i] = 0;
      s->terminal_length[port][i] = 0;
    }
    s->total_terminal_length[port] = 0;
    s->in_send_loop[port] = 0;
    s->last_buf_full[port] = 0.0;
    s->busy_time[port] = 0.0;
    s->busy_time_sample[port] = 0.0;
    s->terminal_available_time[port] = 0.0;
  }
  s->issueIdle = 0;

  return;
}

void post_terminal_init(terminal_state *s, tw_lp *lp)
{
  /* read any LFTs which might have been generated by an external routing
   * algorithm, e.g., through the use of opensm\
   */
  if(s->params->routing == STATIC) {
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   if(0 != read_static_lft(s->params->term_id_to_info[s->terminal_id].guid, s->lft, s->params)) {
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     tw_error(TW_LOC, "Error while reading the routing table for terminal");
   }
  }
}

//CHANGE: fill this function to set up router's connectivity and network
//specific data structures
static void create_router_connections(router_state * r, tw_lp * lp) {
  local_param *p = (local_param *)r->params;
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  Switch_info &my_info = p->switch_id_to_info[r->router_id];
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  for(int port = 0; port < r->radix; port++) {
    End &next_port = my_info.ports[port];
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    if(next_port.isTerm) {
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      r->conn_gids[port] = codes_mapping_get_lpid_from_relative(next_port.id, 
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          NULL, LP_CONFIG_NM_TERM, r->anno, 1);
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    } else {
      r->conn_gids[port] = codes_mapping_get_lpid_from_relative(next_port.id, 
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          NULL, LP_CONFIG_NM_ROUT, r->anno, 1);
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    }
  }
}

static void router_setup(router_state * r, tw_lp * lp)
{
  char anno[MAX_NAME_LENGTH];
  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];
  }

  local_param *p = (local_param *)r->params;


  r->router_id = codes_mapping_get_lp_relative_id(lp->gid, 0, 0);
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  if(r->router_id >= p->num_switches) {
    r->unused = 1;
    return;
  }

  r->unused = 0;

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  Switch_info &my_info = p->switch_id_to_info[r->router_id];
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  r->radix = my_info.radix;

  r->fwd_events = 0;
  r->rev_events = 0;

  r->next_output_available_time = (tw_stime*)malloc(r->radix * sizeof(tw_stime));
  r->link_traffic = (int64_t*)malloc(r->radix * sizeof(int64_t));
  r->link_traffic_sample = (int64_t*)malloc(r->radix * sizeof(int64_t));

  r->vc_occupancy = (int**)malloc(r->radix * sizeof(int*));
  r->in_send_loop = (int*)malloc(r->radix * sizeof(int));
  r->pending_msgs =
    (message_list ***)malloc(r->radix * sizeof(message_list**));
  r->pending_msgs_tail =
    (message_list ***)malloc(r->radix * sizeof(message_list**));
  r->queued_msgs =
    (message_list ***)malloc(r->radix * sizeof(message_list**));
  r->queued_msgs_tail =
    (message_list ***)malloc(r->radix * sizeof(message_list**));
  r->queued_count = (int*)malloc(r->radix * sizeof(int));
  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));

  rc_stack_create(&r->st);
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  for(int i = 0; i < r->radix; i++)
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  {
    // Set credit & router occupancy
    r->last_buf_full[i] = 0.0;
    r->busy_time[i] = 0.0;
    r->busy_time_sample[i] = 0.0;
    r->next_output_available_time[i] = 0;
    r->link_traffic[i] = 0;
    r->link_traffic_sample[i] = 0;
    r->queued_count[i] = 0;
    r->in_send_loop[i] = 0;
    r->vc_occupancy[i] = (int *)malloc(p->num_vcs * sizeof(int));
    r->pending_msgs[i] = (message_list **)malloc(p->num_vcs *
        sizeof(message_list*));
    r->pending_msgs_tail[i] = (message_list **)malloc(p->num_vcs *
        sizeof(message_list*));
    r->queued_msgs[i] = (message_list **)malloc(p->num_vcs *
        sizeof(message_list*));
    r->queued_msgs_tail[i] = (message_list **)malloc(p->num_vcs *
        sizeof(message_list*));
    for(int j = 0; j < p->num_vcs; j++) {
      r->vc_occupancy[i][j] = 0;
      r->pending_msgs[i][j] = NULL;
      r->pending_msgs_tail[i][j] = NULL;
      r->queued_msgs[i][j] = NULL;
      r->queued_msgs_tail[i][j] = NULL;
    }
  }

  create_router_connections(r, lp);
  return;
}

void post_router_init(router_state *r, tw_lp *lp)
{
  /* read any LFTs which might have been generated by an external routing
   * algorithm, e.g., through the use of opensm\
   */
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  if(r->params->routing == STATIC) {
   if(0 != read_static_lft(r->params->switch_id_to_info[r->router_id].guid, r->lft, r->params)) {
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     tw_error(TW_LOC, "Error while reading the routing table for switch");
   }
  }
}

/* packet event , generates a packet on the compute node */
static tw_stime local_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)
{
  (void)message_offset;
  (void)sched_params;
  tw_event * e_new;
  tw_stime xfer_to_nic_time;
  LOCAL_MSG_STRUCT * 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, LOCAL_NETWORK_NAME, (void**)&msg, (void**)&tmp_ptr);
  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;
  msg->packet_size = packet_size;
  msg->travel_start_time = tw_now(sender);
  msg->remote_event_size_bytes = 0;
  msg->local_event_size_bytes = 0;
  msg->type = T_GENERATE;
  msg->dest_terminal_id = req->dest_mn_lp;
  msg->dest_terminal = codes_mapping_get_lp_relative_id(msg->dest_terminal_id, 0, 0);
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  msg->message_id = req->msg_id;
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  msg->is_pull = req->is_pull;
  msg->pull_size = req->pull_size;
  msg->magic = terminal_magic_num;
  msg->msg_start_time = req->msg_start_time;

  if(is_last_pckt) /* Its the last packet so pass in remote and local event information*/
  {
    if(req->remote_event_size > 0)
    {
      msg->remote_event_size_bytes = req->remote_event_size;
      memcpy(tmp_ptr, remote_event, req->remote_event_size);
      tmp_ptr += req->remote_event_size;
    }
    if(req->self_event_size > 0)
    {
      msg->local_event_size_bytes = req->self_event_size;
      memcpy(tmp_ptr, self_event, req->self_event_size);
      tmp_ptr += req->self_event_size;
    }
  }
  tw_event_send(e_new);
  return xfer_to_nic_time;
}

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

/* generates packet at the current compute node */
static void packet_generate(terminal_state * s, tw_bf * bf, LOCAL_MSG_STRUCT * msg,
    tw_lp * lp) {
  packet_gen++;
  s->packet_gen++;

  tw_stime ts, nic_ts;

  assert(lp->gid != msg->dest_terminal_id);
  const local_param *p = s->params;

  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;

  nic_ts = g_tw_lookahead + (msg->packet_size * s->params->cn_delay) +
    tw_rand_unif(lp->rng);

  msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter;
  msg->my_N_hop = 0;

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  int output_port = -1, use_vc = 0;
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  //find the next port by looking up the lft
  if(s->params->routing == STATIC) {
    output_port = s->lft[msg->dest_terminal];
    /* assert should only fail if read LFT is incomplete -> broken routing */
    assert(output_port >= 0);
  } else {
    tw_error(TW_LOC, "Only static routing supported in this topology\n");
  }

  /* TODO: adaptive greedy vc selection */
  int min_vc_length = s->terminal_length[output_port][use_vc];
  for(int vc = 1; vc < s->params->num_vcs; vc++) {
    if(s->terminal_length[output_port][vc] < min_vc_length) {
      min_vc_length = s->terminal_length[output_port][vc];
      use_vc = vc;
    }
  }
  msg->saved_port = output_port;
  msg->saved_vc = use_vc;

  for(uint64_t i = 0; i < num_chunks; i++)
  {
    message_list *cur_chunk = (message_list*)malloc(
        sizeof(message_list));
    init_message_list(cur_chunk, msg);

    if(msg->remote_event_size_bytes + msg->local_event_size_bytes > 0) {
      cur_chunk->event_data = (char*)malloc(
          msg->remote_event_size_bytes + msg->local_event_size_bytes);
    }

    void * m_data_src = model_net_method_get_edata(LOCAL_NETWORK_NAME, 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;
      memcpy((char*)cur_chunk->event_data + msg->remote_event_size_bytes,
          m_data_src, msg->local_event_size_bytes);
    }

    cur_chunk->LOCAL_MSG_NAME_FROM_UNION.chunk_id = i;
    cur_chunk->port = output_port; cur_chunk->index = use_vc;
    append_to_message_list(s->terminal_msgs[output_port], s->terminal_msgs_tail[output_port],
        use_vc, cur_chunk);
    s->total_terminal_length[output_port] += s->params->chunk_size;
    s->terminal_length[output_port][use_vc] += s->params->chunk_size;
  }

  if(s->total_terminal_length[output_port] < s->params->num_vcs * s->params->cn_vc_size) {
    model_net_method_idle_event(nic_ts, 0, lp);
  } else {
    bf->c11 = 1;
    s->issueIdle = 1;
  }

  if(s->in_send_loop == 0) {
    bf->c5 = 1;
    ts = codes_local_latency(lp);
    LOCAL_MSG_STRUCT *m;
    tw_event* e = model_net_method_event_new(lp->gid, ts, lp, LOCAL_NETWORK_NAME,
        (void**)&m, NULL);
    m->type = T_SEND;
    m->magic = terminal_magic_num;
    m->vc_index = output_port;
    s->in_send_loop[output_port] = 1;
    tw_event_send(e);
  }

  total_event_size = model_net_get_msg_sz(LOCAL_NETWORK_NAME) +
    msg->remote_event_size_bytes + msg->local_event_size_bytes;
  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->local_stats_array);
  stat->send_count++;
  stat->send_bytes += msg->packet_size;
  stat->send_time += p->cn_delay * msg->packet_size;
  if(stat->max_event_size < total_event_size)
    stat->max_event_size = total_event_size;

  return;
}

static void packet_generate_rc(terminal_state * s, tw_bf * bf, LOCAL_MSG_STRUCT * msg, tw_lp * lp)
{
  int output_port = msg->saved_port;
  int vc = msg->saved_vc;
  s->packet_gen--;
  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++) {
    delete_message_list(return_tail(s->terminal_msgs[output_port],
          s->terminal_msgs_tail[output_port], vc));
    s->total_terminal_length[output_port] -= s->params->chunk_size;
    s->terminal_length[output_port][vc] -= s->params->chunk_size;
  }
  if(bf->c11) {
    s->issueIdle = 0;
  }
  if(bf->c5) {
    codes_local_latency_reverse(lp);
    s->in_send_loop[output_port] = 0;
  }
  struct mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->local_stats_array);
  stat->send_count--;
  stat->send_bytes -= msg->packet_size;
  stat->send_time -= s->params->cn_delay * msg->packet_size;
}


/* sends the packet from the current compute node to the attached router */
static void packet_send(terminal_state * s, tw_bf * bf, LOCAL_MSG_STRUCT * msg,
    tw_lp * lp) {

  tw_stime ts;
  tw_event *e;
  LOCAL_MSG_STRUCT *m;
  tw_lpid router_id;

  std::vector<VC_Entry> entries;
  bool noEmptyVC = false;
  int output_port = msg->vc_index;

  for(int i = 0; i < s->params->num_vcs; i++) {
    if(s->terminal_msgs[output_port][i] != NULL) {
      if(s->vc_occupancy[output_port][i] + s->params->chunk_size <= s->params->cn_vc_size) {
        VC_Entry tmp;
        tmp.vc = i; tmp.entry = s->terminal_msgs[output_port][i];
        entries.push_back(tmp);
      } else {
        noEmptyVC = true;
      }
    }
  }

  if(entries.size() == 0) {
    bf->c1 = 1;
    s->in_send_loop[output_port] = 0;
    if(noEmptyVC && !s->last_buf_full[output_port]) {
      bf->c3 = 1;
      msg->saved_busy_time = s->last_buf_full[output_port];
      s->last_buf_full[output_port] = tw_now(lp);
    }
    return;
  }
  
  if(s->last_buf_full[output_port] > 0.0)
  {
    bf->c4 = 1;
    msg->saved_total_time = s->busy_time[output_port];
    msg->saved_busy_time = s->last_buf_full[output_port];
    msg->saved_sample_time = s->busy_time_sample[output_port];

    s->busy_time[output_port] += (tw_now(lp) - s->last_buf_full[output_port]);
    s->busy_time_sample[output_port] += (tw_now(lp) - s->last_buf_full[output_port]);
    s->last_buf_full[output_port] = 0.0;
  }

  //CHANGE: randomly pick the VC to send on can be changed.
  int pick = tw_rand_integer(lp->rng, 0, entries.size() - 1);
  message_list* cur_entry = entries[pick].entry;
  int use_vc = entries[pick].vc;
  msg->saved_vc = use_vc;

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

  if(!num_chunks)
    num_chunks = 1;

  tw_stime delay;
  if((cur_entry->LOCAL_MSG_NAME_FROM_UNION.packet_size % s->params->chunk_size)
      && (cur_entry->LOCAL_MSG_NAME_FROM_UNION.chunk_id == num_chunks - 1))
    delay = (cur_entry->LOCAL_MSG_NAME_FROM_UNION.packet_size % s->params->chunk_size) *
      s->params->cn_delay;
  else
    delay = s->params->chunk_size * s->params->cn_delay;

  msg->saved_available_time = s->terminal_available_time[output_port];
  ts = g_tw_lookahead + delay + tw_rand_unif(lp->rng);
  s->terminal_available_time[output_port] = maxd(s->terminal_available_time[output_port], tw_now(lp));
  s->terminal_available_time[output_port] += ts;

  ts = s->terminal_available_time[output_port] - tw_now(lp);
  void * remote_event;
  e = model_net_method_event_new(s->conn_gids[output_port], ts, lp, LOCAL_NETWORK_ROUTER_NAME,
      (void**)&m, &remote_event);
  memcpy(m, &cur_entry->LOCAL_MSG_NAME_FROM_UNION, sizeof(LOCAL_MSG_STRUCT));
  if (m->remote_event_size_bytes){
    memcpy(remote_event, cur_entry->event_data, m->remote_event_size_bytes);
  }

  m->type = R_ARRIVE;
  m->src_terminal_id = lp->gid;
  m->vc_index = 0;
  m->output_chan = use_vc;
  m->last_hop = TERMINAL;
  m->magic = router_magic_num;
  m->local_event_size_bytes = 0;
  tw_event_send(e);

  if(cur_entry->LOCAL_MSG_NAME_FROM_UNION.chunk_id == num_chunks - 1 &&
      (cur_entry->LOCAL_MSG_NAME_FROM_UNION.local_event_size_bytes > 0)) {
    bf->c2 = 1;
    tw_stime local_ts = codes_local_latency(lp);
    tw_event *e_new = tw_event_new(cur_entry->LOCAL_MSG_NAME_FROM_UNION.sender_lp, local_ts, lp);
    void * m_new = tw_event_data(e_new);
    void *local_event = (char*)cur_entry->event_data +
      cur_entry->LOCAL_MSG_NAME_FROM_UNION.remote_event_size_bytes;
    memcpy(m_new, local_event, cur_entry->LOCAL_MSG_NAME_FROM_UNION.local_event_size_bytes);
    tw_event_send(e_new);
  }
  s->packet_counter++;
  s->vc_occupancy[output_port][use_vc] += s->params->chunk_size;
  cur_entry = return_head(s->terminal_msgs[output_port], s->terminal_msgs_tail[output_port], use_vc);
  rc_stack_push(lp, cur_entry, delete_message_list, s->st);
  s->total_terminal_length[output_port] -= s->params->chunk_size;
  s->terminal_length[output_port][use_vc] -= s->params->chunk_size;

  LOCAL_MSG_STRUCT *m_new;
  ts += tw_rand_unif(lp->rng);
  e = model_net_method_event_new(lp->gid, ts, lp, LOCAL_NETWORK_NAME,
      (void**)&m_new, NULL);
  m_new->type = T_SEND;
  m_new->magic = terminal_magic_num;
  tw_event_send(e);

  if(s->issueIdle) {
    bf->c5 = 1;
    s->issueIdle = 0;
    ts += tw_rand_unif(lp->rng);
    model_net_method_idle_event(ts, 0, lp);
  }
  return;
}

static void packet_send_rc(terminal_state * s, tw_bf * bf, LOCAL_MSG_STRUCT * msg,
    tw_lp * lp)
{
  int output_port = msg->vc_index;

  if(bf->c1) {
    s->in_send_loop[output_port] = 1;
    if(bf->c3) {
      s->last_buf_full[output_port] = msg->saved_busy_time;
    }
    return;
  }
    
  if(bf->c4)
  {
    s->busy_time[output_port] = msg->saved_total_time;
    s->last_buf_full[output_port] = msg->saved_busy_time;
    s->busy_time_sample[output_port] = msg->saved_sample_time;
  }

  tw_rand_reverse_unif(lp->rng);
  tw_rand_reverse_unif(lp->rng);
  s->terminal_available_time[output_port] = msg->saved_available_time;
  if(bf->c2) {
    codes_local_latency_reverse(lp);
  }

  int use_vc = msg->saved_vc;

  s->packet_counter--;
  s->vc_occupancy[output_port][use_vc] -= s->params->chunk_size;

  message_list* cur_entry = (message_list *)rc_stack_pop(s->st);
  cur_entry->port = output_port; cur_entry->index = use_vc;
  prepend_to_message_list(s->terminal_msgs[output_port], s->terminal_msgs_tail[output_port],
      use_vc, cur_entry);
  s->terminal_length[output_port][use_vc] += s->params->chunk_size;
  s->total_terminal_length[output_port] += s->params->chunk_size;

  tw_rand_reverse_unif(lp->rng);
  if(bf->c5)
  {
    tw_rand_reverse_unif(lp->rng);
    s->issueIdle = 1;
  }
  return;
}

static void send_remote_event(terminal_state * s, LOCAL_MSG_STRUCT * msg,
  tw_lp * lp, tw_bf * bf, char * event_data, int remote_event_size)
{
  void * tmp_ptr = model_net_method_get_edata(LOCAL_NETWORK_NAME, msg);
  //tw_stime ts = g_tw_lookahead + s->params->cn_delay *
  //    msg->remote_event_size_bytes + tw_rand_unif(lp->rng);;
  tw_stime ts = g_tw_lookahead + tw_rand_unif(lp->rng);
  if (msg->is_pull){
    bf->c4 = 1;
    struct codes_mctx mc_dst =
      codes_mctx_set_global_direct(msg->sender_mn_lp);
    struct codes_mctx mc_src =
      codes_mctx_set_global_direct(lp->gid);
    int net_id = model_net_get_id(LP_METHOD_NM_TERM);

    model_net_set_msg_param(MN_MSG_PARAM_START_TIME,
        MN_MSG_PARAM_START_TIME_VAL, &(msg->msg_start_time));

    msg->event_rc = model_net_event_mctx(net_id, &mc_src, &mc_dst, msg->category,
        msg->sender_lp, msg->pull_size, ts,
        remote_event_size, tmp_ptr, 0, NULL, lp);
  } else {
    tw_event * e = tw_event_new(msg->final_dest_gid, ts, lp);
    void * m_remote = tw_event_data(e);
    memcpy(m_remote, event_data, remote_event_size);
    tw_event_send(e);
  }
  return;
}

/* packet arrives at the destination terminal */
static void packet_arrive(terminal_state * s, tw_bf * bf, LOCAL_MSG_STRUCT * msg,
    tw_lp * lp) {

  assert(lp->gid == msg->dest_terminal_id);

  //total chunks expected in this message
  uint64_t total_chunks = msg->total_size / s->params->chunk_size;
  if(msg->total_size % s->params->chunk_size)
    total_chunks++;
  if(!total_chunks)
    total_chunks = 1;

  /* send credit back to router */
  tw_stime ts = g_tw_lookahead + s->params->credit_delay + tw_rand_unif(lp->rng);
  tw_event * buf_e;
  LOCAL_MSG_STRUCT * buf_msg;
  buf_e = model_net_method_event_new(msg->intm_lp_id, ts, lp,
      LOCAL_NETWORK_ROUTER_NAME, (void**)&buf_msg, NULL);
  buf_msg->magic = router_magic_num;
  buf_msg->vc_index = msg->vc_index;
  buf_msg->output_chan = msg->output_chan;
  buf_msg->type = R_BUFFER;
  tw_event_send(buf_e);

  //save stats
  /* Total overall finished chunks in simulation */
  N_finished_chunks++;
  /* Finished chunks on a LP basis */
  s->finished_chunks++;
  /* Finished chunks per sample */
  s->fin_chunks_sample++;

  assert(lp->gid != msg->src_terminal_id);

  // chunks part of this packet
  uint64_t 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;

  if(msg->chunk_id == num_chunks - 1)
  {
    bf->c31 = 1;
    s->packet_fin++;
    packet_fin++;
  }

  /* save the sample time */
  msg->saved_sample_time = s->fin_chunks_time;
  s->fin_chunks_time += (tw_now(lp) - msg->travel_start_time);
  /* save the total time per LP */
  msg->saved_avg_time = s->total_time;
  s->total_time += (tw_now(lp) - msg->travel_start_time);
  msg->saved_total_time = local_total_time;
  local_total_time += tw_now( lp ) - msg->travel_start_time;
  total_hops += msg->my_N_hop;
  s->total_hops += msg->my_N_hop;
  s->fin_hops_sample += msg->my_N_hop;

  mn_stats* stat = model_net_find_stats(msg->category, s->local_stats_array);
  msg->saved_rcv_time = stat->recv_time;
  stat->recv_time += (tw_now(lp) - msg->travel_start_time);

  /* Now retreieve the number of chunks completed from the hash and update
   * them */

  struct mn_hash_key key;
  key.message_id = msg->message_id;
  key.sender_id = msg->sender_lp;
  struct qhash_head *hash_link = NULL;
  struct mn_qhash_entry * tmp = NULL;
  hash_link = qhash_search(s->rank_tbl, &key);
  if(hash_link)
    tmp = qhash_entry(hash_link, struct mn_qhash_entry, hash_link);

  /* If an entry does not exist then create one */
  if(!tmp)
  {
    bf->c5 = 1;
    struct mn_qhash_entry * d_entry = (struct mn_qhash_entry *)
        malloc(sizeof(struct mn_qhash_entry));
    d_entry->num_chunks = 0;
    d_entry->key = key;
    d_entry->remote_event_data = NULL;
    d_entry->remote_event_size = 0;
    qhash_add(s->rank_tbl, &key, &(d_entry->hash_link));

    hash_link = &(d_entry->hash_link);
    tmp = d_entry;
  }

  assert(tmp);
  tmp->num_chunks++;

  if(msg->chunk_id == num_chunks - 1)
  {
    bf->c1 = 1;
    stat->recv_count++;
    stat->recv_bytes += msg->packet_size;
    N_finished_packets++;
    s->finished_packets++;
  }

  /* if its the last chunk of the packet then handle the remote event data */
  if(msg->remote_event_size_bytes > 0 && !tmp->remote_event_data)
  {
    /* Retreive the remote event entry */
    void *m_data_src = model_net_method_get_edata(LOCAL_NETWORK_NAME, msg);
    tmp->remote_event_data = (char*)malloc(msg->remote_event_size_bytes);
    assert(tmp->remote_event_data);
    tmp->remote_event_size = msg->remote_event_size_bytes;
    memcpy(tmp->remote_event_data, m_data_src, msg->remote_event_size_bytes);
  }

  if (local_max_latency < tw_now( lp ) - msg->travel_start_time) {
    bf->c3 = 1;
    msg->saved_available_time = local_max_latency;
    local_max_latency = tw_now( lp ) - msg->travel_start_time;
  }

  if(tmp->num_chunks >= total_chunks)
  {
    bf->c7 = 1;

    N_finished_msgs++;
    total_msg_sz += msg->total_size;
    s->total_msg_size += msg->total_size;
    s->data_size_sample += msg->total_size;
    s->finished_msgs++;

    if(tmp->remote_event_data && tmp->remote_event_size > 0) {
      bf->c8 = 1;
      send_remote_event(s, msg, lp, bf, tmp->remote_event_data,
          tmp->remote_event_size);
    }

    /* Remove the hash entry */
    qhash_del(hash_link);
    rc_stack_push(lp, tmp, free_tmp, s->st);
  }
  return;
}

static void packet_arrive_rc(terminal_state * s, tw_bf * bf, LOCAL_MSG_STRUCT * msg, tw_lp * lp)
{
  tw_rand_reverse_unif(lp->rng);
  N_finished_chunks--;
  s->finished_chunks--;
  s->fin_chunks_sample--;
  if(bf->c31)
  {
    s->packet_fin--;
    packet_fin--;
  }

  s->fin_chunks_time = msg->saved_sample_time;
  s->total_time = msg->saved_avg_time;
  local_total_time  = msg->saved_total_time;
  total_hops -= msg->my_N_hop;
  s->total_hops -= msg->my_N_hop;
  s->fin_hops_sample -= msg->my_N_hop;

  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->local_stats_array);
  stat->recv_time = msg->saved_rcv_time;

  struct qhash_head * hash_link = NULL;
  struct mn_qhash_entry * tmp = NULL;

  struct mn_hash_key key;
  key.message_id = msg->message_id;
  key.sender_id = msg->sender_lp;

  hash_link = qhash_search(s->rank_tbl, &key);
  if(hash_link)
    tmp = qhash_entry(hash_link, struct mn_qhash_entry, hash_link);

  if(bf->c1)
  {
    stat->recv_count--;
    stat->recv_bytes -= msg->packet_size;
    N_finished_packets--;
    s->finished_packets--;
  }

  if(bf->c3)
    local_max_latency = msg->saved_available_time;

  if(bf->c7)
  {
    N_finished_msgs--;
    total_msg_sz -= msg->total_size;
    s->total_msg_size -= msg->total_size;
    s->data_size_sample -= msg->total_size;
    s->finished_msgs--;

    if(bf->c8)
      tw_rand_reverse_unif(lp->rng);

    struct mn_qhash_entry * d_entry_pop = (struct mn_qhash_entry * )
        rc_stack_pop(s->st);
    qhash_add(s->rank_tbl, &key, &(d_entry_pop->hash_link));

    hash_link = &(d_entry_pop->hash_link);
    tmp = d_entry_pop;

    if(bf->c4)
      model_net_event_rc2(lp, &msg->event_rc);
  }

  assert(tmp);
  tmp->num_chunks--;

  if(bf->c5)
  {
    qhash_del(hash_link);
    free_tmp(tmp);
  }
  return;
}

/* update the compute node-router channel buffer */
static void
terminal_buf_update(terminal_state * s,
    tw_bf * bf,
    LOCAL_MSG_STRUCT * msg,
    tw_lp * lp)
{
  int output_port = msg->vc_index;
  s->vc_occupancy[output_port][msg->output_chan] -= s->params->chunk_size;

  if(s->in_send_loop[output_port] == 0) {
    int do_send = 0;
    for(int i = 0; i < s->params->num_vcs; i++) {
      if(s->terminal_msgs[output_port][i] != NULL) {
        do_send = 1;
        break;
      }
    }
    if(do_send) {
      LOCAL_MSG_STRUCT *m;
      bf->c1 = 1;
      tw_stime ts = codes_local_latency(lp);
      tw_event* e = model_net_method_event_new(lp->gid, ts, lp, LOCAL_NETWORK_NAME,
          (void**)&m, NULL);
      m->type = T_SEND;
      m->magic = terminal_magic_num;
      m->vc_index = output_port;
      s->in_send_loop[output_port] = 1;
      tw_event_send(e);
    }
  }
  return;
}

static void terminal_buf_update_rc(terminal_state * s,
    tw_bf * bf,
    LOCAL_MSG_STRUCT * msg,
    tw_lp * lp)
{
  s->vc_occupancy[msg->vc_index][msg->output_chan] += s->params->chunk_size;
  if(bf->c1) {
    codes_local_latency_reverse(lp);
    s->in_send_loop[msg->vc_index] = 0;
  }
  return;
}

static void terminal_event( terminal_state * s,
    tw_bf * bf,
    LOCAL_MSG_STRUCT * msg,
    tw_lp * lp )
{
  s->fwd_events++;
  assert(msg->magic == terminal_magic_num);
  rc_stack_gc(lp, s->st);
  switch(msg->type)
  {
    case T_GENERATE:
      packet_generate(s,bf,msg,lp);
      break;

    case T_ARRIVE:
      packet_arrive(s,bf,msg,lp);
      break;

    case T_SEND:
      packet_send(s,bf,msg,lp);
      break;

    case T_BUFFER:
      terminal_buf_update(s, bf, msg, lp);
      break;

    default:
      printf("\n LP %d Terminal message type not supported %d ", (int)lp->gid, msg->type);
      tw_error(TW_LOC, "Msg type not supported");
  }
}

/* Reverse computation handler for a terminal event */
static void terminal_event_rc (terminal_state * s,
    tw_bf * bf,
    LOCAL_MSG_STRUCT * msg,
    tw_lp * lp)
{
  s->rev_events++;
  switch(msg->type)
  {
    case T_GENERATE:
      packet_generate_rc(s, bf, msg, lp);
      break;

    case T_SEND:<