dragonfly.c 68.1 KB
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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

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

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#include <ross.h>

#include "codes/codes_mapping.h"
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#include "codes/jenkins-hash.h"
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#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
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#include "codes/model-net-lp.h"
#include "codes/net/dragonfly.h"
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#define CREDIT_SIZE 8
#define MEAN_PROCESS 1.0

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/* collective specific parameters */
#define TREE_DEGREE 4
#define LEVEL_DELAY 1000
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#define DRAGONFLY_COLLECTIVE_DEBUG 0
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#define NUM_COLLECTIVES  1
#define COLLECTIVE_COMPUTATION_DELAY 5700
#define DRAGONFLY_FAN_OUT_DELAY 20.0
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#define WINDOW_LENGTH 0
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// debugging parameters
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#define TRACK -1
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#define PRINT_ROUTER_TABLE 1
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#define DEBUG 0
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#define LP_CONFIG_NM (model_net_lp_config_names[DRAGONFLY])
#define LP_METHOD_NM (model_net_method_names[DRAGONFLY])

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

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

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

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

/* number of routers in a mapping group */
static int num_routers_per_mgrp = 0;
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struct dragonfly_param
{
    // configuration parameters
    int num_routers; /*Number of routers in a group*/
    double local_bandwidth;/* bandwidth of the router-router channels within a group */
    double global_bandwidth;/* bandwidth of the inter-group router connections */
    double cn_bandwidth;/* bandwidth of the compute node channels connected to routers */
    int num_vcs; /* number of virtual channels */
    int local_vc_size; /* buffer size of the router-router channels */
    int global_vc_size; /* buffer size of the global channels */
    int cn_vc_size; /* buffer size of the compute node channels */
    int chunk_size; /* full-sized packets are broken into smaller chunks.*/

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

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

typedef struct terminal_state terminal_state;
typedef struct router_state router_state;

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

   // Dragonfly specific parameters
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   tw_lpid router_id;
   tw_lpid terminal_id;
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   // Each terminal will have an input and output channel with the router
   int* vc_occupancy; // NUM_VC
   int* output_vc_state;
   tw_stime terminal_available_time;
   tw_stime next_credit_available_time;
// Terminal generate, sends and arrival T_SEND, T_ARRIVAL, T_GENERATE
// Router-Router Intra-group sends and receives RR_LSEND, RR_LARRIVE
// Router-Router Inter-group sends and receives RR_GSEND, RR_GARRIVE
   struct mn_stats dragonfly_stats_array[CATEGORY_MAX];
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  /* collective init time */
  tw_stime collective_init_time;

  /* node ID in the tree */ 
   tw_lpid node_id;

   /* messages sent & received in collectives may get interchanged several times so we have to save the 
     origin server information in the node's state */
   tw_lpid origin_svr; 
  
  /* parent node ID of the current node */
   tw_lpid parent_node_id;
   /* array of children to be allocated in terminal_init*/
   tw_lpid* children;

   /* children of a node can be less than or equal to the tree degree */
   int num_children;

   short is_root;
   short is_leaf;

   /* to maintain a count of child nodes that have fanned in at the parent during the collective
      fan-in phase*/
   int num_fan_nodes;
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   const char * anno;
   const dragonfly_param *params;
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};
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/* terminal event type (1-4) */
enum event_t
{
  T_GENERATE=1,
  T_ARRIVE,
  T_SEND,
  T_BUFFER,
  R_SEND,
  R_ARRIVE,
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  R_BUFFER,
  D_COLLECTIVE_INIT,
  D_COLLECTIVE_FAN_IN,
  D_COLLECTIVE_FAN_OUT
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};
/* status of a virtual channel can be idle, active, allocated or wait for credit */
enum vc_status
{
   VC_IDLE,
   VC_ACTIVE,
   VC_ALLOC,
   VC_CREDIT
};

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

/* three forms of routing algorithms available, adaptive routing is not
 * accurate and fully functional in the current version as the formulas
 * for detecting load on global channels are not very accurate */
enum ROUTING_ALGO
{
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    MINIMAL = 0,
    NON_MINIMAL,
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    ADAPTIVE,
    PROG_ADAPTIVE
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};

struct router_state
{
   unsigned int router_id;
   unsigned int group_id;
  
   int* global_channel; 
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   tw_stime* next_output_available_time;
   tw_stime* next_credit_available_time;
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   tw_stime* cur_hist_start_time;
   
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   int* vc_occupancy;
   int* output_vc_state;
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   const char * anno;
   const dragonfly_param *params;
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   int* prev_hist_num;
   int* cur_hist_num;
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};

static short routing = MINIMAL;

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

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

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

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

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

    configuration_get_value_int(&config, "PARAMS", "local_vc_size", anno, &p->local_vc_size);
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    if(p->local_vc_size <= 0) {
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        p->local_vc_size = 1024;
        fprintf(stderr, "Buffer size of local channels not specified, setting to %d\n", p->local_vc_size);
    }

    configuration_get_value_int(&config, "PARAMS", "global_vc_size", anno, &p->global_vc_size);
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    if(p->global_vc_size <= 0) {
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        p->global_vc_size = 2048;
        fprintf(stderr, "Buffer size of global channels not specified, setting to %d\n", p->global_vc_size);
    }

    configuration_get_value_int(&config, "PARAMS", "cn_vc_size", anno, &p->cn_vc_size);
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    if(p->cn_vc_size <= 0) {
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        p->cn_vc_size = 1024;
        fprintf(stderr, "Buffer size of compute node channels not specified, setting to %d\n", p->cn_vc_size);
    }

    configuration_get_value_int(&config, "PARAMS", "chunk_size", anno, &p->chunk_size);
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    if(p->chunk_size <= 0) {
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        p->chunk_size = 64;
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        fprintf(stderr, "Chunk size for packets is not specified, setting to %d\n", p->chunk_size);
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    }

    configuration_get_value_double(&config, "PARAMS", "local_bandwidth", anno, &p->local_bandwidth);
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    if(p->local_bandwidth <= 0) {
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        p->local_bandwidth = 5.25;
        fprintf(stderr, "Bandwidth of local channels not specified, setting to %lf\n", p->local_bandwidth);
    }

    configuration_get_value_double(&config, "PARAMS", "global_bandwidth", anno, &p->global_bandwidth);
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    if(p->global_bandwidth <= 0) {
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        p->global_bandwidth = 4.7;
        fprintf(stderr, "Bandwidth of global channels not specified, setting to %lf\n", p->global_bandwidth);
    }

    configuration_get_value_double(&config, "PARAMS", "cn_bandwidth", anno, &p->cn_bandwidth);
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    if(p->cn_bandwidth <= 0) {
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        p->cn_bandwidth = 5.25;
        fprintf(stderr, "Bandwidth of compute node channels not specified, setting to %lf\n", p->cn_bandwidth);
    }


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

    // set the derived parameters
    p->num_cn = p->num_routers/2;
    p->num_global_channels = p->num_routers/2;
    p->num_groups = p->num_routers * p->num_cn + 1;
    p->radix = p->num_vcs *
        (p->num_cn + p->num_global_channels + p->num_routers);
    p->total_routers = p->num_groups * p->num_routers;
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    p->total_terminals = p->total_routers * p->num_cn;
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    printf("\n Total nodes %d routers %d groups %d radix %d num_vc %d ", p->num_cn * p->total_routers,
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								p->total_routers,
								p->num_groups,
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								p->radix,
                                                                p->num_vcs);
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}

static void dragonfly_configure(){
    anno_map = codes_mapping_get_lp_anno_map(LP_CONFIG_NM);
    assert(anno_map);
    num_params = anno_map->num_annos + (anno_map->has_unanno_lp > 0);
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    all_params = calloc(num_params, sizeof(*all_params));
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    for (uint64_t i = 0; i < anno_map->num_annos; i++){
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        const char * anno = anno_map->annotations[i].ptr;
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        dragonfly_read_config(anno, &all_params[i]);
    }
    if (anno_map->has_unanno_lp > 0){
        dragonfly_read_config(NULL, &all_params[anno_map->num_annos]);
    }
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}

/* report dragonfly statistics like average and maximum packet latency, average number of hops traversed */
static void dragonfly_report_stats()
{
   long long avg_hops, total_finished_packets;
   tw_stime avg_time, max_time;
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   int total_minimal_packets, total_nonmin_packets, total_completed_packets;
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   MPI_Reduce( &total_hops, &avg_hops, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &N_finished_packets, &total_finished_packets, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &dragonfly_total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &dragonfly_max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
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   if(routing == ADAPTIVE || routing == PROG_ADAPTIVE)
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    {
	MPI_Reduce(&minimal_count, &total_minimal_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
 	MPI_Reduce(&nonmin_count, &total_nonmin_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
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 	MPI_Reduce(&completed_packets, &total_completed_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
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    }
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   /* print statistics */
   if(!g_tw_mynode)
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   {	
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      printf("\n total finished packets %d ", total_finished_packets);
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      printf(" Average number of hops traversed %f average message latency %lf us maximum message latency %lf us \n", (float)avg_hops/total_finished_packets, avg_time/(total_finished_packets*1000), max_time/1000);
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     if(routing == ADAPTIVE || routing == PROG_ADAPTIVE)
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              printf("\n ADAPTIVE ROUTING STATS: %d packets routed minimally %d packets routed non-minimally completed packets %d ", total_minimal_packets, total_nonmin_packets, total_completed_packets);
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  }
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   return;
}
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void dragonfly_collective_init(terminal_state * s,
           		   tw_lp * lp)
{
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    // TODO: be annotation-aware
    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
            NULL, 1);
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    int num_reps = codes_mapping_get_group_reps(lp_group_name);
    s->node_id = (mapping_rep_id * num_lps) + mapping_offset;

    int i;
   /* handle collective operations by forming a tree of all the LPs */
   /* special condition for root of the tree */
   if( s->node_id == 0)
    {
        s->parent_node_id = -1;
        s->is_root = 1;
   }
   else
   {
       s->parent_node_id = (s->node_id - ((s->node_id - 1) % TREE_DEGREE)) / TREE_DEGREE;
       s->is_root = 0;
   }
   s->children = (tw_lpid*)malloc(TREE_DEGREE * sizeof(tw_lpid));

   /* set the isleaf to zero by default */
   s->is_leaf = 1;
   s->num_children = 0;

   /* calculate the children of the current node. If its a leaf, no need to set children,
      only set isleaf and break the loop*/

   for( i = 0; i < TREE_DEGREE; i++ )
    {
        tw_lpid next_child = (TREE_DEGREE * s->node_id) + i + 1;
        if(next_child < (num_lps * num_reps))
        {
            s->num_children++;
            s->is_leaf = 0;
            s->children[i] = next_child;
        }
        else
           s->children[i] = -1;
    }

#if DRAGONFLY_COLLECTIVE_DEBUG == 1
   printf("\n LP %ld parent node id ", s->node_id);

   for( i = 0; i < TREE_DEGREE; i++ )
        printf(" child node ID %ld ", s->children[i]);
   printf("\n");

   if(s->is_leaf)
        printf("\n LP %ld is leaf ", s->node_id);
#endif
}

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/* dragonfly packet event , generates a dragonfly packet on the compute node */
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static tw_stime dragonfly_packet_event(char const * category, tw_lpid final_dest_lp, tw_lpid dest_mn_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;
    terminal_message * msg;
    char* tmp_ptr;

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    xfer_to_nic_time = codes_local_latency(sender); /* Throws an error of found last KP time > current event time otherwise when LPs of one type are placed together*/
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    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);
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    strcpy(msg->category, category);
    msg->final_dest_gid = final_dest_lp;
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    msg->dest_terminal_id = dest_mn_lp;
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    msg->sender_lp=src_lp;
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    msg->sender_mn_lp = sender->gid;
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    msg->packet_size = packet_size;
    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
    msg->type = T_GENERATE;
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    msg->magic = terminal_magic_num;
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    msg->is_pull = is_pull;
    msg->pull_size = pull_size;
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    msg->chunk_id = 0;
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    if(is_last_pckt) /* Its the last packet so pass in remote and local event information*/
      {
	if(remote_event_size > 0)
	 {
		msg->remote_event_size_bytes = remote_event_size;
		memcpy(tmp_ptr, remote_event, remote_event_size);
		tmp_ptr += remote_event_size;
	}
	if(self_event_size > 0)
	{
		msg->local_event_size_bytes = self_event_size;
		memcpy(tmp_ptr, self_event, self_event_size);
		tmp_ptr += self_event_size;
	}
     }
    tw_event_send(e_new);
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    return xfer_to_nic_time;
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}

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

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/* given two group IDs, find the router of the src_gid that connects to the dest_gid*/
tw_lpid getRouterFromGroupID(int dest_gid, 
		    int src_gid,
		    int num_routers)
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{
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  int group_begin = src_gid * num_routers;
  int group_end = (src_gid * num_routers) + num_routers-1;
  int offset = (dest_gid * num_routers - group_begin) / num_routers;
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  if((dest_gid * num_routers) < group_begin)
    offset = (group_begin - dest_gid * num_routers) / num_routers; // take absolute value
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  int half_channel = num_routers / 4;
  int index = (offset - 1)/(half_channel * num_routers);
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  offset=(offset - 1) % (half_channel * num_routers);
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  // If the destination router is in the same group
  tw_lpid router_id;

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

  return router_id;
}	

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

  int dest=0, credit_delay=0, type = R_BUFFER;
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  int is_terminal = 0;
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  int found_magic = router_magic_num;
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  const dragonfly_param *p = s->params;
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  int sender_radix;
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 // Notify sender terminal about available buffer space
  if(msg->last_hop == TERMINAL)
  {
   dest = msg->src_terminal_id;
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   sender_radix = msg->local_id % p->num_cn;  
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   //determine the time in ns to transfer the credit
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   credit_delay = (1 / p->cn_bandwidth) * CREDIT_SIZE;
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   type = T_BUFFER;
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   is_terminal = 1;
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   found_magic = terminal_magic_num;
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  }
   else if(msg->last_hop == GLOBAL)
   {
     dest = msg->intm_lp_id;
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     sender_radix = p->num_cn + (msg->local_id % p->num_global_channels);
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     credit_delay = (1 / p->global_bandwidth) * CREDIT_SIZE;
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   }
    else if(msg->last_hop == LOCAL)
     {
        dest = msg->intm_lp_id;
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        sender_radix = p->num_cn + p->num_global_channels + (msg->local_id % p->num_routers);
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     	credit_delay = (1/p->local_bandwidth) * CREDIT_SIZE;
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     }
    else
      printf("\n Invalid message type");

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

    tw_event_send(buf_e);

    return;
}

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static void packet_generate_send_rc(terminal_state * s, 
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			    tw_bf * bf, 
			    terminal_message * msg, 
			    tw_lp * lp)
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{
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    int i;
    tw_rand_reverse_unif(lp->rng);
	 
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   s->terminal_available_time = msg->saved_available_time;
   tw_rand_reverse_unif(lp->rng);
   int vc = msg->saved_vc;
   s->vc_occupancy[vc]--;
   s->packet_counter--;
   s->output_vc_state[vc] = VC_IDLE;

   if (msg->chunk_id == (msg->num_chunks-1)){
     codes_local_latency_reverse(lp);
   }
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    if(bf->c1)
        codes_local_latency_reverse(lp);

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     struct mn_stats* stat;
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     stat = model_net_find_stats(msg->category, s->dragonfly_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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}
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/* generates packet at the current dragonfly compute node */
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static void packet_generate_send(terminal_state * s, 
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			    tw_bf * bf, 
			    terminal_message * msg, 
			    tw_lp * lp)
{
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        const dragonfly_param *p = s->params;
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	tw_stime ts;
	tw_event *e;
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        tw_lpid router_id;
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	terminal_message *m;
	int i, total_event_size;

	uint64_t num_chunks = msg->packet_size / p->chunk_size;
	if (msg->packet_size % s->params->chunk_size)
	  num_chunks++;
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	if(!num_chunks)
	   num_chunks = 1;
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	msg->num_chunks = num_chunks;
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	msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter + tw_rand_integer(lp->rng, 0, lp->gid + g_tw_nlp * s->packet_counter);
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	//  Each packet is broken into chunks and then sent over the channel
	msg->saved_available_time = s->terminal_available_time;
	double head_delay = (1/s->params->cn_bandwidth) * s->params->chunk_size;
	ts = head_delay + tw_rand_exponential(lp->rng, (double)head_delay/200);
	s->terminal_available_time = maxd(s->terminal_available_time, tw_now(lp));
	s->terminal_available_time += ts;
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        if(msg->chunk_id == 0)
            msg->travel_start_time = tw_now(lp);
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	int chan = -1, j;
	for(j = 0; j < p->num_vcs; j++)
	 {
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	     if(s->vc_occupancy[j] < p->cn_vc_size)
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	      {
	       chan=j;
	       break;
	      }
	 }
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	/* for reverse computation */
	msg->saved_vc = chan;
  
        /* simulation should exit */
	if(chan == -1)
	    tw_error(TW_LOC, "\n No terminal buffers available, increase buffer size");
	   
        //TODO: be annotation-aware
        codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
		   &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
	   
	codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", NULL, 1,
		   s->router_id/num_routers_per_mgrp, 
		   s->router_id % num_routers_per_mgrp, &router_id);
   
        e = tw_event_new(router_id, s->terminal_available_time - tw_now(lp), lp);
	m = tw_event_data(e);
	memcpy(m, msg, sizeof(terminal_message));
	m->magic = router_magic_num;
	m->origin_router_id = s->router_id;
        m->type = R_ARRIVE;
        m->src_terminal_id = lp->gid;
        m->chunk_id = msg->chunk_id;
   	m->saved_vc = chan;
        m->last_hop = TERMINAL;
        m->intm_group_id = -1;
        m->path_type = -1;
        m->local_event_size_bytes = 0;
        m->local_id = s->terminal_id;
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	 if (msg->remote_event_size_bytes){
		memcpy(m+1, model_net_method_get_edata(DRAGONFLY, msg),
			msg->remote_event_size_bytes);
	   }
   
	tw_event_send(e);
	
       if(msg->chunk_id == msg->num_chunks - 1) 
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	{
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		// now that message is sent, issue an "idle" event to tell the scheduler
		// when I'm next available
		model_net_method_idle_event(codes_local_latency(lp) +
		      s->terminal_available_time - tw_now(lp), 0, lp);

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

	if(s->vc_occupancy[chan] >= s->params->cn_vc_size)
	    s->output_vc_state[chan] = VC_CREDIT;

	/* calculate statistics */
	total_event_size = model_net_get_msg_sz(DRAGONFLY) + 
	msg->remote_event_size_bytes + msg->local_event_size_bytes;
	struct mn_stats* stat;
	stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
	stat->send_count++;
	stat->send_bytes += msg->packet_size;
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	stat->send_time += (s->terminal_available_time - tw_now(lp));
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	if(stat->max_event_size < total_event_size)
	  stat->max_event_size = total_event_size;
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        /* Now schedule another packet generate event */
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	if(msg->chunk_id < num_chunks - 1)
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	{
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	     bf->c1 = 1;
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	     /* Issue another packet generate event */
	     tw_event * e_gen;
	     terminal_message * m_gen;
	     void * m_gen_data;

	     /* Keep the packet generate event a little behind packet send */
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	     ts = s->terminal_available_time - tw_now(lp) + codes_local_latency(lp);
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	     e_gen = model_net_method_event_new(lp->gid, ts, lp, DRAGONFLY, (void**)&m_gen,(void**)&m_gen_data); 

	     void *m_gen_data_src = model_net_method_get_edata(DRAGONFLY, msg);
	     memcpy(m_gen, msg, sizeof(terminal_message));

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	     m_gen->chunk_id = ++(msg->chunk_id);
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             m_gen->type = T_GENERATE;

	      if (msg->remote_event_size_bytes){
		memcpy(m_gen_data, m_gen_data_src,
			msg->remote_event_size_bytes);
		m_gen_data = (char*)m_gen_data + msg->remote_event_size_bytes;
		m_gen_data_src = (char*)m_gen_data_src + msg->remote_event_size_bytes;
	      }
	    if (msg->local_event_size_bytes)
		memcpy(m_gen_data, m_gen_data_src, msg->local_event_size_bytes);
     
           tw_event_send(e_gen); 
       }
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  return;
}

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static void packet_arrive_rc(terminal_state * s, 
		   tw_bf * bf, 
                   terminal_message * msg, 
                   tw_lp * lp)
{
    
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    uint64_t num_chunks = msg->packet_size / s->params->chunk_size;
    if (msg->packet_size % s->params->chunk_size)
        num_chunks++;
   
    if(msg->chunk_id == num_chunks - 1)
      completed_packets--;
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   if(msg->path_type == MINIMAL && msg->chunk_id == num_chunks - 1)
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	minimal_count--;

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   if(msg->path_type == NON_MINIMAL && msg->chunk_id == num_chunks - 1)
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	nonmin_count--;

   tw_rand_reverse_unif(lp->rng);
   s->next_credit_available_time = msg->saved_credit_time;
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   if(msg->chunk_id == num_chunks-1)
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   {
    mn_stats* stat;
    stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
    stat->recv_count--;
    stat->recv_bytes -= msg->packet_size;
    stat->recv_time -= tw_now(lp) - msg->travel_start_time;
    
    N_finished_packets--;
    
    dragonfly_total_time -= (tw_now(lp) - msg->travel_start_time);
    if(bf->c3)
	 dragonfly_max_latency = msg->saved_available_time;
   }
    
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   if (msg->chunk_id == (msg->num_chunks)-1 && 
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		msg->remote_event_size_bytes && 
		msg->is_pull)
    {
	    int net_id = model_net_get_id(LP_METHOD_NM);
	    model_net_event_rc(net_id, lp, msg->pull_size);
    }

}
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/* packet arrives at the destination terminal */
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static void packet_arrive(terminal_state * s, 
		   tw_bf * bf, 
                   terminal_message * msg, 
                   tw_lp * lp)
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{
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    uint64_t num_chunks = msg->packet_size / s->params->chunk_size;
    if (msg->packet_size % s->params->chunk_size)
        num_chunks++;
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   if(msg->chunk_id == num_chunks - 1) 
     completed_packets++;
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    if(msg->path_type == MINIMAL && msg->chunk_id == num_chunks - 1)
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	minimal_count++;

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    if(msg->path_type == NON_MINIMAL && msg->chunk_id == num_chunks - 1)
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	nonmin_count++;
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    if(msg->path_type != MINIMAL && msg->path_type != NON_MINIMAL)
	printf("\n Wrong message path type %d ", msg->path_type);
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#if DEBUG == 1
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if( msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
    {
	printf( "(%lf) [Terminal %d] packet %lld has arrived  \n",
              tw_now(lp), (int)lp->gid, msg->packet_ID);

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

    }
#endif

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

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

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

	 if (dragonfly_max_latency < tw_now( lp ) - msg->travel_start_time) 
	 {
		bf->c3 = 1;
		msg->saved_available_time = dragonfly_max_latency;
		dragonfly_max_latency=tw_now( lp ) - msg->travel_start_time;
	 }
	// Trigger an event on receiving server
	if(msg->remote_event_size_bytes)
	{
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            void * tmp_ptr = model_net_method_get_edata(DRAGONFLY, msg);
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            ts = g_tw_lookahead + 0.1 + (1/s->params->cn_bandwidth) * msg->remote_event_size_bytes;
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            if (msg->is_pull){
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                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);
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                int net_id = model_net_get_id(LP_METHOD_NM);
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                model_net_event_mctx(net_id, &mc_src, &mc_dst, msg->category,
                        msg->sender_lp, msg->pull_size, ts,
                        msg->remote_event_size_bytes, tmp_ptr, 0, NULL, lp);
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            }
            else{
                e = tw_event_new(msg->final_dest_gid, ts, lp);
                m = tw_event_data(e);
                memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
                tw_event_send(e); 
            }
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	}
  }

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

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  if(msg->intm_lp_id == TRACK)
	printf("\n terminal sending credit at chan %d ", msg->saved_vc);
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  //TODO: be annotation-aware
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  // no method_event here - message going to router
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  buf_e = tw_event_new(msg->intm_lp_id, s->next_credit_available_time - tw_now(lp), lp);
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  buf_msg = tw_event_data(buf_e);
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  buf_msg->magic = router_magic_num;
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  buf_msg->vc_index = msg->saved_vc;
  buf_msg->type=R_BUFFER;
  buf_msg->packet_ID=msg->packet_ID;
  buf_msg->last_hop = TERMINAL;
  tw_event_send(buf_e);

  return;
}

/* initialize a dragonfly compute node terminal */
void 
terminal_init( terminal_state * s, 
	       tw_lp * lp )
{
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//    printf("\n terminal ID %ld ", lp->gid);
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    uint32_t h1 = 0, h2 = 0; 
    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    terminal_magic_num = h1 + h2;
    
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    int i;
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    char anno[MAX_NAME_LENGTH];

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

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   int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
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           s->anno, 0);
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   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;  
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   s->router_id=(int)s->terminal_id / (s->params->num_routers/2);
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   s->terminal_available_time = 0.0;
   s->packet_counter = 0;

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   s->vc_occupancy = (int*)malloc(s->params->num_vcs * sizeof(int));
   s->output_vc_state = (int*)malloc(s->params->num_vcs * sizeof(int));
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   for( i = 0; i < s->params->num_vcs; i++ )
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    {
      s->vc_occupancy[i]=0;
      s->output_vc_state[i]=VC_IDLE;
    }
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//   printf("\n Terminal ID %d Router ID %d ", s->terminal_id, s->router_id);
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   dragonfly_collective_init(s, lp);
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   return;
}

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/* collective operation for the torus network */
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void dragonfly_collective(char const * category, int message_size, int remote_event_size, const void* remote_event, tw_lp* sender)
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{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    terminal_message * msg;
    tw_lpid local_nic_id;
    char* tmp_ptr;

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    codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id,
            NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
            mapping_rep_id, mapping_offset, &local_nic_id);
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    xfer_to_nic_time = codes_local_latency(sender);
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    e_new = model_net_method_event_new(local_nic_id, xfer_to_nic_time,
            sender, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);

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

    tmp_ptr = (char*)msg;
    tmp_ptr += dragonfly_get_msg_sz();
    if(remote_event_size > 0)
     {
            msg->remote_event_size_bytes = remote_event_size;
            memcpy(tmp_ptr, remote_event, remote_event_size);
            tmp_ptr += remote_event_size;
     }

    tw_event_send(e_new);
    return;
}

/* reverse for collective operation of the dragonfly network */
void dragonfly_collective_rc(int message_size, tw_lp* sender)
{
     codes_local_latency_reverse(sender);
     return;
}

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

static void node_collective_init(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        tw_event * e_new;
        tw_lpid parent_nic_id;
        tw_stime xfer_to_nic_time;
        terminal_message * msg_new;
        int num_lps;

        msg->saved_collective_init_time = s->collective_init_time;
        s->collective_init_time = tw_now(lp);
	s->origin_svr = msg->sender_svr;
	
        if(s->is_leaf)
        {
            //printf("\n LP %ld sending message to parent %ld ", s->node_id, s->parent_node_id);
            /* get the global LP ID of the parent node */
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            // TODO: be annotation-aware
            codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id,
                    NULL, &mapping_type_id, NULL, &mapping_rep_id,
                    &mapping_offset);
            num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
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                    s->anno, 0);
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->anno, 0,
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                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
	    void* m_data;
	    e_new = model_net_method_event_new(parent_nic_id, xfer_to_nic_time,
            	lp, DRAGONFLY, (void**)&msg_new, (void**)&m_data);
	    	
            memcpy(msg_new, msg, sizeof(terminal_message));
	    if (msg->remote_event_size_bytes){
        	memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
                	msg->remote_event_size_bytes);
      	    }
	    
            msg_new->type = D_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            tw_event_send(e_new);
        }
        return;
}

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

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        codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id,
                NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
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                s->anno, 0);
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        tw_event* e_new;
        terminal_message * msg_new;
        tw_stime xfer_to_nic_time;

        bf->c1 = 0;
        bf->c2 = 0;

        /* if the number of fanned in nodes have completed at the current node then signal the parent */
        if((s->num_fan_nodes == s->num_children) && !s->is_root)
        {
            bf->c1 = 1;
            msg->saved_fan_nodes = s->num_fan_nodes-1;
            s->num_fan_nodes = 0;
            tw_lpid parent_nic_id;
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;

            /* get the global LP ID of the parent node */
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            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, s->anno, 0,
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                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
            //msg_new = tw_event_data(e_new);
	    void * m_data;
      	    e_new = model_net_method_event_new(parent_nic_id,
              xfer_to_nic_time,
              lp, DRAGONFLY, (void**)&msg_new, &m_data);
	    
            memcpy(msg_new, msg, sizeof(terminal_message));
            msg_new->type = D_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            if (msg->remote_event_size_bytes){
	        memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
        	        msg->remote_event_size_bytes);
      	   }
	    
            tw_event_send(e_new);
      }

      /* root node starts off with the fan-out phase */
      if(s->is_root && (s->num_fan_nodes == s->num_children))
      {
           bf->c2 = 1;
           msg->saved_fan_nodes = s->num_fan_nodes-1;
           s->num_fan_nodes = 0;
           send_remote_event(s, bf, msg, lp);

           for( i = 0; i < s->num_children; i++ )
           {
                tw_lpid child_nic_id;
                /* Do some computation and fan out immediate child nodes from the collective */
                xfer_to_nic_time = g_tw_lookahead + COLLECTIVE_COMPUTATION_DELAY + LEVEL_DELAY + tw_rand_exponential(lp->rng, (double)LEVEL_DELAY/50);

                /* get global LP ID of the child node */
1141 1142 1143
                codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
                        s->children[i]/num_lps, (s->children[i] % num_lps),
                        &child_nic_id);
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
                //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);

                //msg_new = tw_event_data(e_new);
                void * m_data;
	        e_new = model_net_method_event_new(child_nic_id,
                xfer_to_nic_time,
		lp, DRAGONFLY, (void**)&msg_new, &m_data);

		memcpy(msg_new, msg, sizeof(terminal_message));
	        if (msg->remote_event_size_bytes){
1154
	                memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
        	               msg->remote_event_size_bytes);
      		}
		
                msg_new->type = D_COLLECTIVE_FAN_OUT;
                msg_new->sender_node = s->node_id;

                tw_event_send(e_new);
           }
      }
}

static void node_collective_fan_out(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        int i;
1172 1173
        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
                NULL, 1);
1174 1175 1176 1177 1178 1179 1180 1181 1182
        bf->c1 = 0;
        bf->c2 = 0;

        send_remote_event(s, bf, msg, lp);

        if(!s->is_leaf)
        {
            bf->c1 = 1;
            tw_event* e_new;
1183
            terminal_message * msg_new;
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            tw_stime xfer_to_nic_time;

           for( i = 0; i < s->num_children; i++ )
           {
                xfer_to_nic_time = g_tw_lookahead + DRAGONFLY_FAN_OUT_DELAY + tw_rand_exponential(lp->rng, (double)DRAGONFLY_FAN_OUT_DELAY/10);

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

                        /* get global LP ID of the child node */
1195
                        codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM,
1196
                                s->anno, 0, s->children[i]/num_lps,
1197
                                (s->children[i] % num_lps), &child_nic_id);
1198 1199 1200 1201 1202 1203 1204
                        //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);
                        //msg_new = tw_event_data(e_new);
                        //memcpy(msg_new, msg, sizeof(nodes_message) + msg->remote_event_size_bytes);
			void* m_data;
			e_new = model_net_method_event_new(child_nic_id,
							xfer_to_nic_time,
					                lp, DRAGONFLY, (void**)&msg_new, &m_data);
1205
		        memcpy(msg_new, msg, sizeof(terminal_message));
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
		        if (msg->remote_event_size_bytes){
			        memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
			                msg->remote_event_size_bytes);
      			}


                        msg_new->type = D_COLLECTIVE_FAN_OUT;
                        msg_new->sender_node = s->node_id;
                        tw_event_send(e_new);
                }
           }
         }
	//printf("\n Fan out phase completed %ld ", lp->gid);
        if(max_collective < tw_now(lp) - s->collective_init_time )
          {
              bf->c2 = 1;
              max_collective = tw_now(lp) - s->collective_init_time;
          }
}
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237

static void 
terminal_buf_update_rc(terminal_state * s, 
		    tw_bf * bf, 
		    terminal_message * msg, 
		    tw_lp * lp)
{
    int msg_indx = msg->vc_index;
    s->vc_occupancy[msg_indx]++;
    if(s->vc_occupancy[msg_indx] == s->params->cn_vc_size)
       s->output_vc_state[msg_indx] = VC_CREDIT;
}

1238
/* update the compute node-router channel buffer */
1239
static void 
1240 1241 1242 1243 1244 1245 1246 1247 1248
terminal_buf_update(terminal_state * s, 
		    tw_bf * bf, 
		    terminal_message * msg, 
		    tw_lp * lp)
{
  // Update the buffer space associated with this router LP 
    int msg_indx = msg->vc_index;
    s->vc_occupancy[msg_indx]--;
    s->output_vc_state[msg_indx] = VC_IDLE;
1249 1250 1251 1252 1253 1254 1255
    
    if(s->vc_occupancy[msg_indx] < 0)
    {
        char buf[64];
        int written = sprintf(buf,
                "terminal %d: error vc occupancy \n",
                lp->gid);
1256

1257 1258
        lp_io_write(lp->gid, "errors", written, buf);
    }
1259 1260 1261 1262 1263 1264 1265 1266 1267
    return;
}

void 
terminal_event( terminal_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp )
{
1268
  assert(msg->magic == terminal_magic_num);
1269 1270 1271 1272
  *(int *)bf = (int)0;
  switch(msg->type)
    {
    case T_GENERATE:
1273
       packet_generate_send(s,bf,msg,lp);
1274 1275 1276 1277 1278 1279 1280 1281 1282
    break;
    
    case T_ARRIVE:
        packet_arrive(s,bf,msg,lp);
    break;
    
    case T_BUFFER:
       terminal_buf_update(s, bf, msg, lp);
     break;
1283 1284 1285 1286
    
    case D_COLLECTIVE_INIT:
      node_collective_init(s, bf, msg, lp);
    break;
1287

1288 1289 1290 1291 1292 1293 1294 1295
    case D_COLLECTIVE_FAN_IN:
      node_collective_fan_in(s, bf, msg, lp);
    break;

    case D_COLLECTIVE_FAN_OUT:
      node_collective_fan_out(s, bf, msg, lp);
    break;
    
1296 1297 1298 1299 1300 1301
    default:
       printf("\n LP %d Terminal message type not supported %d ", (int)lp->gid, msg->type);
    }
}

void 
1302
dragonfly_terminal_final( terminal_state * s, 
1303 1304
      tw_lp * lp )
{
1305
	model_net_print_stats(lp->gid, s->dragonfly_stats_array);
1306 1307
}

1308 1309 1310 1311 1312
void dragonfly_router_final(router_state * s,
		tw_lp * lp)
{
   free(s->global_channel);
}
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347

/* Get the number of hops for this particular path source and destination groups */
int get_num_hops(int local_router_id,
		 int dest_router_id,
		 int num_routers,
		 int non_min)
{
   int local_grp_id = local_router_id / num_routers;
   int dest_group_id = dest_router_id / num_routers;
   int num_hops = 4;

   /* Already at the destination router */
   if(local_router_id == dest_router_id)
    {
	return 1; /* already at the destination, traverse one hop only*/
    }
   else if(local_grp_id == dest_group_id)
    {
		return 2; /* in the same group, each router is connected so 2 additional hops to traverse (source and dest routers). */		
    }	

     /* if the router in the source group has direct connection to the destination group */
     tw_lpid src_connecting_router = getRouterFromGroupID(dest_group_id, local_grp_id, num_routers);

     if(src_connecting_router == local_router_id)		
		num_hops--;

     tw_lpid dest_connecting_router = getRouterFromGroupID(local_grp_id, dest_group_id, num_routers);	

     if(dest_connecting_router == dest_router_id)	
			num_hops--;

     return num_hops;
}

1348 1349 1350 1351 1352 1353 1354 1355
/* get the next stop for the current packet
 * determines if it is a router within a group, a router in another group
 * or the destination terminal */
tw_lpid 
get_next_stop(router_state * s, 
		      tw_bf * bf, 
		      terminal_message * msg, 
		      tw_lp * lp, 
1356 1357 1358
		      int path,
		      int dest_router_id,
		      int intm_id)
1359 1360
{
   int dest_lp;
1361
   tw_lpid router_dest_id = -1;
1362 1363 1364
   int i;
   int dest_group_id;

1365 1366
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
1367
   int local_router_id = mapping_offset + (mapping_rep_id * num_routers_per_mgrp);
1368 1369 1370

   bf->c2 = 0;

1371
  /* If the packet has arrived at the destination router */
1372 1373 1374 1375 1376
   if(dest_router_id == local_router_id)
    {
        dest_lp = msg->dest_terminal_id;
        return dest_lp;
    }
1377
   /* Generate inter-mediate destination for non-minimal routing (selecting a random group) */
1378
   if(msg->last_hop == TERMINAL && path == NON_MINIMAL)
1379
    {
1380
      if(dest_router_id / s->params->num_routers != s->group_id)
1381 1382
         {
            bf->c2 = 1;
1383
	    msg->intm_group_id = intm_id;
1384 1385
          }    
    }
1386
   /******************** DECIDE THE DESTINATION GROUP ***********************/
1387
  /* It means that the packet has arrived at the inter-mediate group for non-minimal routing. Reset the group now. */