dragonfly.c 66.6 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"
#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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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
   unsigned int router_id;
   unsigned int terminal_id;

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

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

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

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

   short is_root;
   short is_leaf;

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

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

/* three forms of routing algorithms available, adaptive routing is not
 * accurate and fully functional in the current version as the formulas
 * for detecting load on global channels are not very accurate */
enum ROUTING_ALGO
{
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    MINIMAL = 0,
    NON_MINIMAL,
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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);
    if(p->num_vcs <= 0) {
        p->num_vcs = 1;
        fprintf(stderr, "Number of virtual channels not specified, setting to %d\n", p->num_vcs);
    }

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

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

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

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

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

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

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


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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;
    printf("\n Total nodes %d routers %d groups %d radix %d ", p->num_cn * p->total_routers,
								p->total_routers,
								p->num_groups,
								p->radix);
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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);
    all_params = malloc(num_params * sizeof(*all_params));

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

/* report dragonfly statistics like average and maximum packet latency, average number of hops traversed */
static void dragonfly_report_stats()
{
   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(" 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 percent packets routed minimally %d percent 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* category, tw_lpid final_dest_lp, uint64_t packet_size, int is_pull, uint64_t pull_size, tw_stime offset, const mn_sched_params *sched_params, int remote_event_size, const void* remote_event, int self_event_size, const void* self_event, tw_lpid src_lp, tw_lp *sender, int is_last_pckt)
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{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    terminal_message * msg;
    char* tmp_ptr;

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    xfer_to_nic_time = codes_local_latency(sender); /* Throws an error of found last KP time > current event time otherwise when LPs of one type are placed together*/
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    //printf("\n transfer in time %f %f ", xfer_to_nic_time+offset, tw_now(sender));
    //e_new = tw_event_new(sender->gid, xfer_to_nic_time+offset, sender);
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    //msg = tw_event_data(e_new);
    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);
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    strcpy(msg->category, category);
    msg->final_dest_gid = final_dest_lp;
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    msg->sender_lp=src_lp;
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    msg->packet_size = packet_size;
    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
    msg->type = T_GENERATE;
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    msg->is_pull = is_pull;
    msg->pull_size = pull_size;
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    if(is_last_pckt) /* Its the last packet so pass in remote and local event information*/
      {
	if(remote_event_size > 0)
	 {
		msg->remote_event_size_bytes = remote_event_size;
		memcpy(tmp_ptr, remote_event, remote_event_size);
		tmp_ptr += remote_event_size;
	}
	if(self_event_size > 0)
	{
		msg->local_event_size_bytes = self_event_size;
		memcpy(tmp_ptr, self_event, self_event_size);
		tmp_ptr += self_event_size;
	}
     }
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	   //printf("\n dragonfly remote event %d local event %d last packet %d %lf ", msg->remote_event_size_bytes, msg->local_event_size_bytes, is_last_pckt, xfer_to_nic_time);
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    tw_event_send(e_new);
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    return xfer_to_nic_time;
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}

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

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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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  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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  }
   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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    //if(dest == TRACK)
//	printf("\n LP %d sending credit back to dest %d at channel %d last hop %d ", lp->gid, dest, msg->saved_vc, msg->last_hop);
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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;
    buf_msg->last_hop = msg->last_hop;
    buf_msg->packet_ID=msg->packet_ID;

    tw_event_send(buf_e);

    return;
}

/* generates packet at the current dragonfly compute node */
void packet_generate(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
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    tw_lpid dest_terminal_id;
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    dest_terminal_id = model_net_find_local_device(DRAGONFLY, s->anno, 0,
            msg->final_dest_gid);
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    msg->dest_terminal_id = dest_terminal_id;

    const dragonfly_param *p = s->params;

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  tw_stime ts;
  tw_event *e;
  terminal_message *m;
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  int i, total_event_size;
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  uint64_t num_chunks = msg->packet_size / p->chunk_size;
  if (msg->packet_size % s->params->chunk_size)
      num_chunks++;
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  msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter + tw_rand_integer(lp->rng, 0, lp->gid + g_tw_nlp * s->packet_counter);
  msg->travel_start_time = tw_now(lp);
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  msg->my_N_hop = 0;
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  for(i = 0; i < num_chunks; i++)
  {
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	  // Before
	  // msg->my_N_hop = 0; generating a packet, check if the input queue is available
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        ts = g_tw_lookahead + 0.1 + tw_rand_exponential(lp->rng, MEAN_INTERVAL/200);
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	int chan = -1, j;
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	for(j = 0; j < p->num_vcs; j++)
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	 {
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	     if(s->vc_occupancy[j] < p->cn_vc_size * num_chunks)
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	      {
	       chan=j;
	       break;
	      }
         }

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        // this is a terminal event, so use the method-event version
       void * m_data;
       e = model_net_method_event_new(lp->gid, i+ts, lp, DRAGONFLY,
               (void**)&m, &m_data);
       memcpy(m, msg, sizeof(terminal_message));
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       m->dest_terminal_id = dest_terminal_id;
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       void * m_data_src = model_net_method_get_edata(DRAGONFLY, msg);
       if (msg->remote_event_size_bytes){
            memcpy(m_data, m_data_src, msg->remote_event_size_bytes);
       }
       if (msg->local_event_size_bytes){ 
            memcpy((char*)m_data + msg->remote_event_size_bytes,
                    (char*)m_data_src + msg->remote_event_size_bytes,
                    msg->local_event_size_bytes);
       }
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       m->intm_group_id = -1;
       m->saved_vc=0;
       m->chunk_id = i;
       
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      /* if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
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         printf("\n packet generated %lld at terminal %d chunk id %d ", msg->packet_ID, (int)lp->gid, i);
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       */
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       m->output_chan = -1;
       if(chan != -1) // If the input queue is available
   	{
	    // Send the packet out
	     m->type = T_SEND;
 	     tw_event_send(e);
        }
      else
         {
	  printf("\n Exceeded queue size, exitting %d", s->vc_occupancy[0]);
	  MPI_Finalize();
	  exit(-1);
        } //else
  } // for
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  total_event_size = model_net_get_msg_sz(DRAGONFLY) + 
      msg->remote_event_size_bytes + msg->local_event_size_bytes;
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  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
  stat->send_count++;
  stat->send_bytes += msg->packet_size;
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  stat->send_time += (1/p->cn_bandwidth) * msg->packet_size;
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  if(stat->max_event_size < total_event_size)
	  stat->max_event_size = total_event_size;
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  return;
}

/* sends the packet from the current dragonfly compute node to the attached router */
void packet_send(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_stime ts;
  tw_event *e;
  terminal_message *m;
  tw_lpid router_id;
  /* Route the packet to its source router */ 
   int vc=msg->saved_vc;

   //  Each packet is broken into chunks and then sent over the channel
   msg->saved_available_time = s->terminal_available_time;
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   double head_delay = (1/s->params->cn_bandwidth) * s->params->chunk_size;
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   ts = head_delay + tw_rand_exponential(lp->rng, (double)head_delay/200);
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   s->terminal_available_time = maxd(s->terminal_available_time, tw_now(lp));
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   s->terminal_available_time += ts;

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   //TODO: be annotation-aware
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
   codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", NULL, 1,
           s->router_id, 0, &router_id);
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   // we are sending an event to the router, so no method_event here
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   e = tw_event_new(router_id, s->terminal_available_time - tw_now(lp), lp);

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

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   //if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
   //  printf("\n terminal %d packet %lld chunk %d being sent to router %d router id %d ", (int)lp->gid, (long long)msg->packet_ID, msg->chunk_id, (int)router_id, s->router_id);
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   m = tw_event_data(e);
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   memcpy(m, msg, sizeof(terminal_message));
   if (msg->remote_event_size_bytes){
        memcpy(m+1, model_net_method_get_edata(DRAGONFLY, msg),
                msg->remote_event_size_bytes);
   }
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   m->origin_router_id = s->router_id;
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   m->type = R_ARRIVE;
   m->src_terminal_id = lp->gid;
   m->saved_vc = vc;
   m->last_hop = TERMINAL;
   m->intm_group_id = -1;
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   m->path_type = -1;
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   m->local_event_size_bytes = 0;
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   m->local_id = s->terminal_id;
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   tw_event_send(e);

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

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   if(s->vc_occupancy[vc] >= (s->params->cn_vc_size * num_chunks))
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      s->output_vc_state[vc] = VC_CREDIT;
   return;
}

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

    if(msg->path_type == MINIMAL)
	minimal_count++;

    if(msg->path_type == NON_MINIMAL)
	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);

	printf("My hop now is %d\n",msg->my_N_hop);
    }
#endif

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

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

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

	 if (dragonfly_max_latency < tw_now( lp ) - msg->travel_start_time) 
	 {
		bf->c3 = 1;
		msg->saved_available_time = dragonfly_max_latency;
		dragonfly_max_latency=tw_now( lp ) - msg->travel_start_time;
	 }
	// Trigger an event on receiving server
	if(msg->remote_event_size_bytes)
	{
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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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                int net_id = model_net_get_id(LP_METHOD_NM);
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                model_net_event(net_id, msg->category, msg->sender_lp,
                        msg->pull_size, ts, msg->remote_event_size_bytes,
                        tmp_ptr, 0, NULL, lp);
            }
            else{
                e = tw_event_new(msg->final_dest_gid, ts, lp);
                m = tw_event_data(e);
                memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
                tw_event_send(e); 
            }
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	}
  }

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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);
  buf_msg->vc_index = msg->saved_vc;
  buf_msg->type=R_BUFFER;
  buf_msg->packet_ID=msg->packet_ID;
  buf_msg->last_hop = TERMINAL;
  tw_event_send(buf_e);

  return;
}

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

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    // Assign the global router ID
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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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   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 */
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                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);
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                //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){
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	                memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
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        	               msg->remote_event_size_bytes);
      		}
		
                msg_new->type = D_COLLECTIVE_FAN_OUT;
                msg_new->sender_node = s->node_id;

                tw_event_send(e_new);
           }
      }
}

static void node_collective_fan_out(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        int i;
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        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
                NULL, 1);
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        bf->c1 = 0;
        bf->c2 = 0;

        send_remote_event(s, bf, msg, lp);

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

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

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

                        /* get global LP ID of the child node */
1103
                        codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM,
1104
                                s->anno, 0, s->children[i]/num_lps,
1105
                                (s->children[i] % num_lps), &child_nic_id);
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
                        //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);
                        //msg_new = tw_event_data(e_new);
                        //memcpy(msg_new, msg, sizeof(nodes_message) + msg->remote_event_size_bytes);
			void* m_data;
			e_new = model_net_method_event_new(child_nic_id,
							xfer_to_nic_time,
					                lp, DRAGONFLY, (void**)&msg_new, &m_data);
		        memcpy(msg_new, msg, sizeof(nodes_message));
		        if (msg->remote_event_size_bytes){
			        memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
			                msg->remote_event_size_bytes);
      			}


                        msg_new->type = D_COLLECTIVE_FAN_OUT;
                        msg_new->sender_node = s->node_id;
                        tw_event_send(e_new);
                }
           }
         }
	//printf("\n Fan out phase completed %ld ", lp->gid);
        if(max_collective < tw_now(lp) - s->collective_init_time )
          {
              bf->c2 = 1;
              max_collective = tw_now(lp) - s->collective_init_time;
          }
}
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
/* update the compute node-router channel buffer */
void 
terminal_buf_update(terminal_state * s, 
		    tw_bf * bf, 
		    terminal_message * msg, 
		    tw_lp * lp)
{
  // Update the buffer space associated with this router LP 
    int msg_indx = msg->vc_index;
    
    s->vc_occupancy[msg_indx]--;
1144
    assert(s->vc_occupancy[msg_indx] >= 0);
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
    s->output_vc_state[msg_indx] = VC_IDLE;

    return;
}

void 
terminal_event( terminal_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp )
{
  *(int *)bf = (int)0;
  switch(msg->type)
    {
    case T_GENERATE:
       packet_generate(s,bf,msg,lp);
    break;
    
    case T_ARRIVE:
        packet_arrive(s,bf,msg,lp);
    break;
    
    case T_SEND:
      packet_send(s,bf,msg,lp);
    break;
    
    case T_BUFFER:
       terminal_buf_update(s, bf, msg, lp);
     break;
1174 1175 1176 1177
    
    case D_COLLECTIVE_INIT:
      node_collective_init(s, bf, msg, lp);
    break;
1178

1179 1180 1181 1182 1183 1184 1185 1186
    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;
    
1187 1188 1189 1190 1191 1192
    default:
       printf("\n LP %d Terminal message type not supported %d ", (int)lp->gid, msg->type);
    }
}

void 
1193
dragonfly_terminal_final( terminal_state * s, 
1194 1195
      tw_lp * lp )
{
1196
	model_net_print_stats(lp->gid, s->dragonfly_stats_array);
1197 1198
}

1199 1200 1201 1202 1203
void dragonfly_router_final(router_state * s,
		tw_lp * lp)
{
   free(s->global_channel);
}
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

/* 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;
}

1239 1240 1241 1242 1243 1244 1245 1246
/* 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, 
1247 1248 1249
		      int path,
		      int dest_router_id,
		      int intm_id)
1250 1251
{
   int dest_lp;
1252
   tw_lpid router_dest_id = -1;
1253 1254 1255
   int i;
   int dest_group_id;

1256 1257
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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   int local_router_id = (mapping_offset + mapping_rep_id);

   bf->c2 = 0;

1262
  /* If the packet has arrived at the destination router */
1263 1264 1265 1266 1267
   if(dest_router_id == local_router_id)
    {
        dest_lp = msg->dest_terminal_id;
        return dest_lp;
    }
1268
   /* Generate inter-mediate destination for non-minimal routing (selecting a random group) */
1269
   if(msg->last_hop == TERMINAL && path == NON_MINIMAL)
1270
    {
1271
      if(dest_router_id / s->params->num_routers != s->group_id)
1272 1273
         {
            bf->c2 = 1;
1274
	    msg->intm_group_id = intm_id;
1275 1276
          }    
    }
1277
   /******************** DECIDE THE DESTINATION GROUP ***********************/
1278
  /* It means that the packet has arrived at the inter-mediate group for non-minimal routing. Reset the group now. */
1279
   if(path == NON_MINIMAL && msg->intm_group_id == s->group_id)
1280 1281 1282
   {  
           msg->intm_group_id = -1;//no inter-mediate group
   } 
1283
  /* Intermediate group ID is set. Divert the packet to the intermediate group. */
1284
  if(path == NON_MINIMAL && msg->intm_group_id >= 0)
1285 1286 1287
   {
      dest_group_id = msg->intm_group_id;
   }
1288
  else /* direct the packet to the destination group */
1289
   {
1290
     dest_group_id = dest_router_id / s->params->num_routers;
1291
   }
1292 1293
 
/********************** DECIDE THE ROUTER IN THE DESTINATION GROUP ***************/ 
1294
  /* It means the packet has arrived at the destination group. Now divert it to the destination router. */
1295 1296 1297 1298 1299 1300
  if(s->group_id == dest_group_id)
   {
     dest_lp = dest_router_id;
   }
   else
   {
1301
      /* Packet is at the source or intermediate group. Find a router that has a path to the destination group. */
1302
      dest_lp=getRouterFromGroupID(dest_group_id,s->router_id/s->params->num_routers, s->params->num_routers);
1303 1304 1305
  
      if(dest_lp == local_router_id)
      {
1306
        for(i=0; i < s->params->num_global_channels; i++)
1307
           {
1308
            if(s->global_channel[i] / s->params->num_routers == dest_group_id)
1309 1310 1311 1312
                dest_lp=s->global_channel[i];
          }
      }
   }
1313
  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", s->anno, 0, dest_lp,
1314
          0, &router_dest_id);
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  return router_dest_id;
}
/* gets the output port corresponding to the next stop of the message */
int 
get_output_port( router_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp, 
		int next_stop )
{
  int output_port = -1, i, terminal_id;
1326 1327 1328
  codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name,
          &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id,
          &mapping_offset);
1329
  int num_lps = codes_mapping_get_lp_count(lp_group_name,1,LP_CONFIG_NM,s->anno,0);
1330
  terminal_id = (mapping_rep_id * num_lps) + mapping_offset;
1331 1332 1333

  if(next_stop == msg->dest_terminal_id)
   {
1334 1335
      output_port = s->params->num_routers + s->params->num_global_channels +
          ( terminal_id % s->params->num_cn);
1336 1337 1338
    }
    else
    {
1339 1340
     codes_mapping_get_lp_info(next_stop, lp_group_name, &mapping_grp_id,
             NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
1341
     int local_router_id = mapping_rep_id + mapping_offset;
1342
     int intm_grp_id = local_router_id / s->params->num_routers;
1343 1344 1345

     if(intm_grp_id != s->group_id)
      {
1346
        for(i=0; i < s->params->num_global_channels; i++)
1347
         {
1348
           if(s->global_channel[i] == local_router_id)
1349
             output_port = s->params->num_routers + i;
1350 1351 1352 1353
          }
      }
      else
       {
1354
        output_port = local_router_id % s->params->num_routers;
1355
       }
1356
//	      printf("\n output port not found %d next stop %d local router id %d group id %d intm grp id %d %d", output_port, next_stop, local_router_id, s->group_id, intm_grp_id, local_router_id%num_routers);
1357 1358 1359 1360 1361
    }
    return output_port;
}


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/* UGAL (first condition is from booksim), output port equality check comes from Dally dragonfly'09*/
static int do_adaptive_routing( router_state * s,
				 tw_bf * bf,
				 terminal_message * msg,
				 tw_lp * lp,
				 int dest_router_id,
				 int intm_id)
{
    int next_stop;
    int minimal_out_port = -1, nonmin_out_port = -1;
     // decide which routing to take
    // get the queue occupancy of both the minimal and non-minimal output ports 
    int minimal_next_stop=get_next_stop(s, bf, msg, lp, MINIMAL, dest_router_id, -1);
1375
    minimal_out_port = get_output_port(s, bf, msg, lp, minimal_next_stop);
1376
    int nonmin_next_stop = get_next_stop(s, bf, msg, lp, NON_MINIMAL, dest_router_id, intm_id);
1377 1378 1379
    nonmin_out_port = get_output_port(s, bf, msg, lp, nonmin_next_stop);
    int nonmin_port_count = s->vc_occupancy[nonmin_out_port];
    int min_port_count = s->vc_occupancy[minimal_out_port];
1380 1381
    //int nonmin_vc = s->vc_occupancy[nonmin_out_port * s->params->num_vcs + 2];
    //int min_vc = s->vc_occupancy[minimal_out_port * s->params->num_vcs + 1];
1382

1383
//    printf("\n min output port %d nonmin output port %d ", minimal_next_stop, nonmin_next_stop);
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
    // Now get the expected number of hops to be traversed for both routes 
    int dest_group_id = dest_router_id / s->params->num_routers;
    int num_min_hops = get_num_hops(s->router_id, dest_router_id, s->params->num_routers, 0);

    int intm_router_id = getRouterFromGroupID(intm_id, s->router_id / s->params->num_routers, s->params->num_routers);

    //printf("\n source %d Intm router id is %d dest router id %d ", s->router_id, intm_router_id, dest_router_id);
    int num_nonmin_hops = get_num_hops(s->router_id, intm_router_id, s->params->num_routers, 1) + get_num_hops(intm_router_id, dest_router_id, s->params->num_routers, 1);

    assert(num_nonmin_hops <= 6);

1395 1396 1397 1398 1399 1400 1401 1402 1403
   /* average the local queues of the router */
   unsigned int q_avg = 0;
   int i;
   for( i = 0; i < s->params->radix; i++)
    {
	if( i != minimal_out_port)
		q_avg += s->vc_occupancy[i]; 
   }
   q_avg = q_avg / (s->params->radix - 1);
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417

   int min_out_chan = minimal_out_port * s->params->num_vcs;
   int nonmin_out_chan = nonmin_out_port * s->params->num_vcs;

   /* Adding history window approach, not taking the queue status at every simulation time thats why, we are maintaining the current history window number and an average of the previous history window number. */
   int min_hist_count = s->cur_hist_num[min_out_chan] + (s->prev_hist_num[min_out_chan]/2);
   int nonmin_hist_count = s->cur_hist_num[nonmin_out_chan] + (s->prev_hist_num[min_out_chan]/2);

   /*printf("\n min hist count %d chan %d nonmin hist count %d %d ", min_hist_count, 
								min_out_chan,
							nonmin_hist_count,
							nonmin_out_chan);
 */ 
  if(num_min_hops * (min_port_count - min_hist_count) <= (num_nonmin_hops * ((q_avg + 1) - nonmin_hist_count)))
1418
     {
1419
	   msg->path_type = MINIMAL;
1420 1421
           next_stop = minimal_next_stop;
           msg->intm_group_id = -1;
1422

1423 1424 1425 1426 1427
           if(msg->packet_ID == TRACK)
              printf("\n (%lf) [Router %d] Packet %d routing minimally ", tw_now(lp), (int)lp->gid, (int)msg->packet_ID);
        }
       else
         {
1428
	   msg->path_type = NON_MINIMAL;
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