dragonfly.c 78.1 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>

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#include "codes/jenkins-hash.h"
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#include "codes/codes_mapping.h"
#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
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#include "codes/model-net-lp.h"
#include "codes/net/dragonfly.h"
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#include "sys/file.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 10
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#define PRINT_ROUTER_TABLE 1
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#define DEBUG 0
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#define USE_DIRECT_SCHEME 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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long term_ecount, router_ecount, term_rev_ecount, router_rev_ecount;
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static double maxd(double a, double b) { return a < b ? b : a; }

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/* minimal and non-minimal packet counts for adaptive routing*/
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static 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;

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typedef struct terminal_message_list terminal_message_list;
struct terminal_message_list {
    terminal_message msg;
    char* event_data;
    terminal_message_list *next;
    terminal_message_list *prev;
};
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void init_terminal_message_list(terminal_message_list *this, 
    terminal_message *inmsg) {
    this->msg = *inmsg;
    this->event_data = NULL;
    this->next = NULL;
    this->prev = NULL;
}
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void delete_terminal_message_list(terminal_message_list *this) {
    if(this->event_data != NULL) free(this->event_data);
    free(this);
}
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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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    double cn_delay;
    double local_delay;
    double global_delay;
    double credit_delay;
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};

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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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   unsigned int router_id;
   unsigned int terminal_id;
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   // Each terminal will have an input and output channel with the router
   int* vc_occupancy; // NUM_VC
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   int num_vcs;
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   tw_stime terminal_available_time;
   tw_stime next_credit_available_time;
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   terminal_message_list **terminal_msgs;
   terminal_message_list **terminal_msgs_tail;
   int in_send_loop;
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// 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,
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  T_SEND,
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  T_BUFFER,
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  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;
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   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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   terminal_message_list ***pending_msgs;
   terminal_message_list ***pending_msgs_tail;
   terminal_message_list ***queued_msgs;
   terminal_message_list ***queued_msgs_tail;
   int *in_send_loop;
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   int** vc_occupancy;
   int* link_traffic;
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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;

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/* convert GiB/s and bytes to ns */
static tw_stime bytes_to_ns(uint64_t bytes, double GB_p_s)
{
    tw_stime time;

    /* bytes to GB */
    time = ((double)bytes)/(1024.0*1024.0*1024.0);
    /* MB to s */
    time = time / GB_p_s;
    /* s to ns */
    time = time * 1000.0 * 1000.0 * 1000.0;

    return(time);
}
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/* returns the dragonfly message size */
static int dragonfly_get_msg_sz(void)
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{
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	   return sizeof(terminal_message);
}
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static void append_to_terminal_message_list(  
        terminal_message_list ** thisq,
        terminal_message_list ** thistail,
        int index, 
        terminal_message_list *msg) {
    if(thisq[index] == NULL) {
        thisq[index] = msg;
    } else {
        thistail[index]->next = msg;
        msg->prev = thistail[index];
    } 
    thistail[index] = msg;
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}

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static void prepend_to_terminal_message_list(  
        terminal_message_list ** thisq,
        terminal_message_list ** thistail,
        int index, 
        terminal_message_list *msg) {
    if(thisq[index] == NULL) {
        thistail[index] = msg;
    } else {
        thisq[index]->prev = msg;
        msg->next = thisq[index];
    } 
    thisq[index] = msg;
}
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static void create_prepend_to_terminal_message_list(
        terminal_message_list ** thisq,
        terminal_message_list ** thistail,
        int index, 
        terminal_message *msg) {
    terminal_message_list* new_entry = (terminal_message_list*)malloc(
        sizeof(terminal_message_list));
    init_terminal_message_list(new_entry, msg);
    if(msg->remote_event_size_bytes) {
        void *m_data = model_net_method_get_edata(DRAGONFLY, msg);
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        size_t s = msg->remote_event_size_bytes + msg->local_event_size_bytes;
        new_entry->event_data = (void*)malloc(s);
        memcpy(new_entry->event_data, m_data, s);
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    }
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    prepend_to_terminal_message_list( thisq, thistail, index, new_entry);
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}

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

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

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static void copy_terminal_list_entry( terminal_message_list *cur_entry,
    terminal_message *msg) {
    terminal_message *cur_msg = &cur_entry->msg;
    msg->travel_start_time = cur_msg->travel_start_time;
    msg->packet_ID = cur_msg->packet_ID;    
    strcpy(msg->category, cur_msg->category);
    msg->final_dest_gid = cur_msg->final_dest_gid;
    msg->sender_lp = cur_msg->sender_lp;
    msg->dest_terminal_id = cur_msg->dest_terminal_id;
    msg->src_terminal_id = cur_msg->src_terminal_id;
    msg->local_id = cur_msg->local_id;
    msg->origin_router_id = cur_msg->origin_router_id;
    msg->my_N_hop = cur_msg->my_N_hop;
    msg->my_l_hop = cur_msg->my_l_hop;
    msg->my_g_hop = cur_msg->my_g_hop;
    msg->intm_lp_id = cur_msg->intm_lp_id;
    msg->saved_channel = cur_msg->saved_channel;
    msg->saved_vc = cur_msg->saved_vc;
    msg->last_hop = cur_msg->last_hop;
    msg->path_type = cur_msg->path_type;
    msg->vc_index = cur_msg->vc_index;
    msg->output_chan = cur_msg->output_chan;
    msg->is_pull = cur_msg->is_pull;
    msg->pull_size = cur_msg->pull_size;
    msg->intm_group_id = cur_msg->intm_group_id;
    msg->chunk_id = cur_msg->chunk_id;
    msg->packet_size = cur_msg->packet_size;
    msg->local_event_size_bytes = cur_msg->local_event_size_bytes;
    msg->remote_event_size_bytes = cur_msg->remote_event_size_bytes;
    msg->sender_node = cur_msg->sender_node;
    msg->next_stop = cur_msg->next_stop;
    msg->magic = cur_msg->magic;

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

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    p->num_vcs = 3;
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    configuration_get_value_int(&config, "PARAMS", "local_vc_size", anno, &p->local_vc_size);
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    if(!p->local_vc_size) {
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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) {
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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) {
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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) {
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        p->chunk_size = 512;
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        fprintf(stderr, "Chunk size for packets is specified, setting to %d\n", p->chunk_size);
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    }

    configuration_get_value_double(&config, "PARAMS", "local_bandwidth", anno, &p->local_bandwidth);
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    if(!p->local_bandwidth) {
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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) {
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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) {
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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;
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    else if(strcmp(routing_str, "nonminimal")==0 || 
            strcmp(routing_str,"non-minimal")==0)
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        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;
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    p->radix = (p->num_cn + p->num_global_channels + p->num_routers);
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    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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    int rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    if(!rank) {
        printf("\n Total nodes %d routers %d groups %d radix %d \n",
                p->num_cn * p->total_routers, p->total_routers, p->num_groups,
                p->radix);
    }
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    p->cn_delay = bytes_to_ns(p->chunk_size, p->cn_bandwidth);
    p->local_delay = bytes_to_ns(p->chunk_size, p->local_bandwidth);
    p->global_delay = bytes_to_ns(p->chunk_size, p->global_bandwidth);
    p->credit_delay = bytes_to_ns(8.0, p->local_bandwidth); //assume 8 bytes packet
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}

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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 = malloc(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(" Average number of hops traversed %f average message latency %lf us maximum message latency %lf us avg time %lf \n", (float)avg_hops/total_finished_packets, avg_time/(total_finished_packets*1000), max_time/1000, avg_time);
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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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/* initialize a dragonfly compute node terminal */
void 
terminal_init( terminal_state * s, 
	       tw_lp * lp )
{
    uint32_t h1 = 0, h2 = 0; 
    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    terminal_magic_num = h1 + h2;
    
    int i;
    char anno[MAX_NAME_LENGTH];

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

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

   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;  
   s->router_id=(int)s->terminal_id / (s->params->num_routers/2);
   s->terminal_available_time = 0.0;
   s->packet_counter = 0;

   s->num_vcs = 1;
   s->vc_occupancy = (int*)malloc(s->num_vcs * sizeof(int));

   for( i = 0; i < s->num_vcs; i++ )
    {
      s->vc_occupancy[i]=0;
    }

   s->terminal_msgs = 
       (terminal_message_list**)malloc(1*sizeof(terminal_message_list*));
   s->terminal_msgs_tail = 
       (terminal_message_list**)malloc(1*sizeof(terminal_message_list*));
   s->terminal_msgs[0] = NULL;
   s->terminal_msgs_tail[0] = NULL;
   s->in_send_loop = 0;

   dragonfly_collective_init(s, lp);
   return;
}


/* sets up the router virtual channels, global channels, 
 * local channels, compute node channels */
void router_setup(router_state * r, tw_lp * lp)
641
{
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
    uint32_t h1 = 0, h2 = 0; 
    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    router_magic_num = h1 + h2;
    
    char anno[MAX_NAME_LENGTH];
    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
            &mapping_type_id, anno, &mapping_rep_id, &mapping_offset);

    if (anno[0] == '\0'){
        r->anno = NULL;
        r->params = &all_params[num_params-1];
    } else{
        r->anno = strdup(anno);
        int id = configuration_get_annotation_index(anno, anno_map);
        r->params = &all_params[id];
    }

    // shorthand
    const dragonfly_param *p = r->params;

   r->router_id=mapping_rep_id + mapping_offset;
   r->group_id=r->router_id/p->num_routers;

   r->global_channel = (int*)malloc(p->num_global_channels * sizeof(int));
   r->next_output_available_time = (tw_stime*)malloc(p->radix * sizeof(tw_stime));
   r->next_credit_available_time = (tw_stime*)malloc(p->radix * sizeof(tw_stime));
   r->cur_hist_start_time = (tw_stime*)malloc(p->radix * sizeof(tw_stime));
   r->link_traffic = (int*)malloc(p->radix * sizeof(int));
   r->cur_hist_num = (int*)malloc(p->radix * sizeof(int));
   r->prev_hist_num = (int*)malloc(p->radix * sizeof(int));
   
   r->vc_occupancy = (int**)malloc(p->radix * sizeof(int*));
   r->in_send_loop = (int*)malloc(p->radix * sizeof(int));
   r->pending_msgs = 
    (terminal_message_list***)malloc(p->radix * sizeof(terminal_message_list**));
   r->pending_msgs_tail = 
    (terminal_message_list***)malloc(p->radix * sizeof(terminal_message_list**));
   r->queued_msgs = 
    (terminal_message_list***)malloc(p->radix * sizeof(terminal_message_list**));
   r->queued_msgs_tail = 
    (terminal_message_list***)malloc(p->radix * sizeof(terminal_message_list**));
  
684
   for(int i=0; i < p->radix; i++)
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703
    {
       // Set credit & router occupancy
	r->next_output_available_time[i]=0;
        r->next_credit_available_time[i]=0;
	r->cur_hist_start_time[i] = 0;
        r->link_traffic[i]=0;
	r->cur_hist_num[i] = 0;
	r->prev_hist_num[i] = 0;
        
        r->in_send_loop[i] = 0;
        r->vc_occupancy[i] = (int*)malloc(p->num_vcs * sizeof(int));
        r->pending_msgs[i] = (terminal_message_list**)malloc(p->num_vcs * 
            sizeof(terminal_message_list*));
        r->pending_msgs_tail[i] = (terminal_message_list**)malloc(p->num_vcs * 
            sizeof(terminal_message_list*));
        r->queued_msgs[i] = (terminal_message_list**)malloc(p->num_vcs * 
            sizeof(terminal_message_list*));
        r->queued_msgs_tail[i] = (terminal_message_list**)malloc(p->num_vcs * 
            sizeof(terminal_message_list*));
704
        for(int j = 0; j < p->num_vcs; j++) {
705 706 707 708 709 710 711 712 713 714 715 716 717 718
            r->vc_occupancy[i][j] = 0;
            r->pending_msgs[i][j] = NULL;
            r->pending_msgs_tail[i][j] = NULL;
            r->queued_msgs[i][j] = NULL;
            r->queued_msgs_tail[i][j] = NULL;
        }
    }

#if DEBUG == 1
   printf("\n LP ID %d VC occupancy radix %d Router %d is connected to ", lp->gid, p->radix, r->router_id);
#endif 
   //round the number of global channels to the nearest even number
#if USE_DIRECT_SCHEME
       int first = r->router_id % p->num_routers;
719
       for(int i=0; i < p->num_global_channels; i++)
720 721 722 723 724 725 726 727 728 729 730 731 732
        {
            int target_grp = first;
            if(target_grp == r->group_id) {
                target_grp = p->num_groups - 1;
            }
            int my_pos = r->group_id % p->num_routers;
            if(r->group_id == p->num_groups - 1) {
                my_pos = target_grp % p->num_routers;
            }
            r->global_channel[i] = target_grp * p->num_routers + my_pos;
            first += p->num_routers;
        }
#else
733 734 735
   int router_offset = (r->router_id % p->num_routers) * 
    (p->num_global_channels / 2) + 1;
   for(int i=0; i < p->num_global_channels; i++)
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
    {
      if(i % 2 != 0)
          {
             r->global_channel[i]=(r->router_id + (router_offset * p->num_routers))%p->total_routers;
             router_offset++;
          }
          else
           {
             r->global_channel[i]=r->router_id - ((router_offset) * p->num_routers);
           }
        if(r->global_channel[i]<0)
         {
           r->global_channel[i]=p->total_routers+r->global_channel[i]; 
	 }
#if DEBUG == 1
    printf("\n channel %d ", r->global_channel[i]);
#endif 
    }
#endif

#if DEBUG == 1
   printf("\n");
#endif
   return;
}	


/* dragonfly packet event , generates a dragonfly packet on the compute node */
static tw_stime dragonfly_packet_event(const char* 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, 
769 770
    const void* self_event, tw_lpid src_lp, tw_lp *sender, int is_last_pckt) 
{
771 772 773 774 775
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    terminal_message * msg;
    char* tmp_ptr;

776 777 778 779
    xfer_to_nic_time = codes_local_latency(sender); 
    //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);
    //msg = tw_event_data(e_new);
780 781
    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);
782 783
    strcpy(msg->category, category);
    msg->final_dest_gid = final_dest_lp;
784
    msg->sender_lp=src_lp;
785 786 787 788
    msg->packet_size = packet_size;
    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
    msg->type = T_GENERATE;
789 790
    msg->is_pull = is_pull;
    msg->pull_size = pull_size;
791
    msg->magic = terminal_magic_num;
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807

    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;
	}
     }
808
	   //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);
809
    tw_event_send(e_new);
810
    return xfer_to_nic_time;
811 812 813 814 815 816 817 818 819
}

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

820 821 822
/* 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,
823 824
		    int num_routers,
                    int total_groups)
825
{
826 827 828 829 830 831 832
#if USE_DIRECT_SCHEME
  int dest = dest_gid;
  if(dest == total_groups - 1) {
      dest = src_gid;
  }
  return src_gid * num_routers + (dest % num_routers);
#else
833 834 835
  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;
836
  
837 838
  if((dest_gid * num_routers) < group_begin)
    offset = (group_begin - dest_gid * num_routers) / num_routers; // take absolute value
839
  
840 841
  int half_channel = num_routers / 4;
  int index = (offset - 1)/(half_channel * num_routers);
842
  
843
  offset=(offset - 1) % (half_channel * num_routers);
844 845 846 847 848 849 850 851 852 853

  // 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;
854
#endif
855 856 857
}	

/*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*/
858 859
void router_credit_send(router_state * s, tw_bf * bf, terminal_message * msg, 
  tw_lp * lp, int sq) {
860 861 862 863
  tw_event * buf_e;
  tw_stime ts;
  terminal_message * buf_msg;

864
  int dest = 0,  type = R_BUFFER;
865
  int is_terminal = 0;
866

867
  const dragonfly_param *p = s->params;
868 869 870 871 872 873 874 875 876 877 878 879 880
 
  // Notify sender terminal about available buffer space
  if(msg->last_hop == TERMINAL) {
    dest = msg->src_terminal_id;
    type = T_BUFFER;
    is_terminal = 1;
  } else if(msg->last_hop == GLOBAL) {
    dest = msg->intm_lp_id;
  } else if(msg->last_hop == LOCAL) {
    dest = msg->intm_lp_id;
  } else
    printf("\n Invalid message type");

881
  ts = g_tw_lookahead + p->credit_delay +  tw_rand_unif(lp->rng);
882
	
883 884 885 886 887 888 889 890 891 892 893 894 895 896
  if (is_terminal) {
    buf_e = model_net_method_event_new(dest, ts, lp, DRAGONFLY, 
      (void**)&buf_msg, NULL);
    buf_msg->magic = terminal_magic_num;
  } else {
    buf_e = tw_event_new(dest, ts , lp);
    buf_msg = tw_event_data(buf_e);
    buf_msg->magic = router_magic_num;
  }
 
  if(sq == -1) {
    buf_msg->vc_index = msg->vc_index;
    buf_msg->output_chan = msg->output_chan;
  } else {
897
    buf_msg->vc_index = msg->saved_vc;
898 899 900 901
    buf_msg->output_chan = msg->saved_channel;
  }
  
  buf_msg->type = type;
902

903 904
  tw_event_send(buf_e);
  return;
905 906
}

907
void packet_generate_rc(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
908
{
909 910 911
   term_rev_ecount++;
   term_ecount--;

912 913
   tw_rand_reverse_unif(lp->rng);

914 915 916
   int num_chunks = msg->packet_size/s->params->chunk_size;
   if(msg->packet_size % s->params->chunk_size)
       num_chunks++;
917

918
   if(!num_chunks)
919
       num_chunks = 1;
920

921 922 923 924 925 926 927 928 929 930 931
   int i;
   for(i = 0; i < num_chunks; i++) {
        delete_terminal_message_list(return_tail(s->terminal_msgs, 
          s->terminal_msgs_tail, 0));
   }
    if(bf->c5) {
        tw_rand_reverse_unif(lp->rng);
        s->in_send_loop = 0;
    }
     struct mn_stats* stat;
     stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
932 933 934 935
     stat->send_count--;
     stat->send_bytes -= msg->packet_size;
     stat->send_time -= (1/s->params->cn_bandwidth) * msg->packet_size;
}
936

937
/* generates packet at the current dragonfly compute node */
938 939 940
void packet_generate(terminal_state * s, tw_bf * bf, terminal_message * msg, 
  tw_lp * lp) {
  term_ecount++;
941

942 943 944 945 946
  tw_stime ts;
  tw_lpid dest_terminal_id;
  dest_terminal_id = model_net_find_local_device(DRAGONFLY, s->anno, 0,
      msg->final_dest_gid);
  msg->dest_terminal_id = dest_terminal_id;
947

948
  const dragonfly_param *p = s->params;
949

950
  ts = g_tw_lookahead + s->params->cn_delay + tw_rand_unif(lp->rng);
951
  model_net_method_idle_event(codes_local_latency(lp), 0, lp);
952

953 954 955
  int i, total_event_size;
  int num_chunks = msg->packet_size / p->chunk_size;
  if (msg->packet_size % s->params->chunk_size) num_chunks++;
956 957 958 959

  if(!num_chunks)
    num_chunks = 1;

960 961 962 963 964 965
  msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter; 
  msg->travel_start_time = tw_now(lp);
  msg->my_N_hop = 0;
  msg->my_l_hop = 0;
  msg->my_g_hop = 0;
  msg->intm_group_id = -1;
966

967 968 969 970 971
  for(i = 0; i < num_chunks; i++)
  {
    terminal_message_list *cur_chunk = (terminal_message_list*)malloc(
      sizeof(terminal_message_list));
    init_terminal_message_list(cur_chunk, msg);
972

973 974 975 976 977 978 979 980 981 982 983 984 985 986
    if(msg->remote_event_size_bytes + msg->local_event_size_bytes > 0) {
      cur_chunk->event_data = (char*)malloc(
          msg->remote_event_size_bytes + msg->local_event_size_bytes);
    }
    
    void * m_data_src = model_net_method_get_edata(DRAGONFLY, msg);
    if (msg->remote_event_size_bytes){
      memcpy(cur_chunk->event_data, m_data_src, msg->remote_event_size_bytes);
    }
    if (msg->local_event_size_bytes){ 
      m_data_src = (char*)m_data_src + msg->remote_event_size_bytes;
      memcpy((char*)cur_chunk->event_data + msg->remote_event_size_bytes, 
          m_data_src, msg->local_event_size_bytes);
    }
987

988 989 990 991
    cur_chunk->msg.chunk_id = i;
    append_to_terminal_message_list(s->terminal_msgs, s->terminal_msgs_tail,
      0, cur_chunk);
  }
992

993 994 995 996 997 998 999 1000 1001 1002 1003
  if(s->in_send_loop == 0) {
    bf->c5 = 1;
    terminal_message *m;
    ts = g_tw_lookahead + s->params->cn_delay + tw_rand_unif(lp->rng);
    tw_event* e = model_net_method_event_new(lp->gid, ts, lp, DRAGONFLY, 
      (void**)&m, NULL);
    m->type = T_SEND;
    m->magic = terminal_magic_num;
    s->in_send_loop = 1;
    tw_event_send(e);
  }
1004

1005 1006 1007 1008 1009 1010 1011 1012
  total_event_size = model_net_get_msg_sz(DRAGONFLY) + 
      msg->remote_event_size_bytes + msg->local_event_size_bytes;
  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
  stat->send_count++;
  stat->send_bytes += msg->packet_size;
  stat->send_time += (1/p->cn_bandwidth) * msg->packet_size;
  if(stat->max_event_size < total_event_size)
1013
	  stat->max_event_size = total_event_size;
1014

1015 1016 1017
  return;
}

1018 1019
void packet_send_rc(terminal_state * s, tw_bf * bf, terminal_message * msg,
        tw_lp * lp)
1020
{
1021 1022
      term_ecount--;
      term_rev_ecount++;
1023

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
      if(bf->c1) {
        s->in_send_loop = 1;
        return;
      }
      
      s->terminal_available_time = msg->saved_available_time;
      tw_rand_reverse_unif(lp->rng);
      if(bf->c2) {
        codes_local_latency_reverse(lp);
      }
     
      s->packet_counter--;
      s->vc_occupancy[0] -= s->params->chunk_size;
1037

1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
      create_prepend_to_terminal_message_list(s->terminal_msgs,
          s->terminal_msgs_tail, 0, msg);
      if(bf->c3) {
        tw_rand_reverse_unif(lp->rng);
      }
      if(bf->c4) {
        s->in_send_loop = 1;
      }
    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) {
  
  term_ecount++;
  tw_stime ts;
  tw_event *e;
  terminal_message *m;
  tw_lpid router_id;
1057

1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
  terminal_message_list* cur_entry = s->terminal_msgs[0];

  if(s->vc_occupancy[0] + s->params->chunk_size > s->params->cn_vc_size 
      || cur_entry == NULL) {
    bf->c1 = 1;
    s->in_send_loop = 0;
    //printf("[%d] Skipping send %d %d\n", lp->gid, cur_entry == NULL, 
    //  (s->vc_occupancy[0] + s->params->chunk_size > s->params->cn_vc_size));
    return;
  }

1069
//  printf("\n Packet %ld sent at time %lf ", cur_entry->msg.packet_ID, tw_now(lp));
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
  msg->saved_available_time = s->terminal_available_time;
  ts = g_tw_lookahead + s->params->cn_delay + tw_rand_unif(lp->rng);
  s->terminal_available_time = maxd(s->terminal_available_time, tw_now(lp));
  s->terminal_available_time += ts;

  //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);
  // we are sending an event to the router, so no method_event here
  e = tw_event_new(router_id, s->terminal_available_time - tw_now(lp), lp);
  m = tw_event_data(e);
  memcpy(m, &cur_entry->msg, sizeof(terminal_message));
  if (m->remote_event_size_bytes){
    memcpy(model_net_method_get_edata(DRAGONFLY, m), cur_entry->event_data,
        m->remote_event_size_bytes);
  }
1088

1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
  m->origin_router_id = s->router_id;
  m->type = R_ARRIVE;
  m->src_terminal_id = lp->gid;
  m->vc_index = 0;
  m->last_hop = TERMINAL;
  m->intm_group_id = -1;
  m->magic = router_magic_num;
  m->path_type = -1;
  m->local_event_size_bytes = 0;
  m->local_id = s->terminal_id;
  tw_event_send(e);

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

1105 1106 1107
  if(!num_chunks)
      num_chunks = 1;

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 1133 1134 1135 1136 1137 1138 1139 1140 1141
  if(cur_entry->msg.chunk_id == num_chunks - 1 && 
      (cur_entry->msg.local_event_size_bytes > 0)) {
    bf->c2 = 1;
    ts = codes_local_latency(lp); 
    tw_event *e_new = tw_event_new(cur_entry->msg.sender_lp, ts, lp);
    terminal_message* m_new = tw_event_data(e_new);
    void *local_event = (char*)cur_entry->event_data + 
      cur_entry->msg.remote_event_size_bytes;
    memcpy(m_new, local_event, cur_entry->msg.local_event_size_bytes);
    tw_event_send(e_new);
  }
  s->packet_counter++;
  s->vc_occupancy[0] += s->params->chunk_size;
  cur_entry = return_head(s->terminal_msgs, s->terminal_msgs_tail, 0); 
  copy_terminal_list_entry(cur_entry, msg);
  delete_terminal_message_list(cur_entry);

  cur_entry = s->terminal_msgs[0];
  
  if(cur_entry != NULL &&
    s->vc_occupancy[0] + s->params->chunk_size <= s->params->cn_vc_size) {
    bf->c3 = 1;
    terminal_message *m;
    ts = g_tw_lookahead + s->params->cn_delay + tw_rand_unif(lp->rng);
    tw_event* e = model_net_method_event_new(lp->gid, ts, lp, DRAGONFLY, 
      (void**)&m, NULL);
    m->type = T_SEND;
    m->magic = terminal_magic_num;
    tw_event_send(e);
  } else {
    bf->c4 = 1;
    s->in_send_loop = 0;
  }
  return;
1142
}
1143 1144

void packet_arrive_rc(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
1145
{
1146 1147
      term_ecount--;
      term_rev_ecount++;
1148

1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
      completed_packets--;
      if(msg->path_type == MINIMAL)
        minimal_count--;
      if(msg->path_type == NON_MINIMAL)
        nonmin_count--;

      if(bf->c2) {
        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);
        total_hops -= msg->my_N_hop;
        if(bf->c3)
          dragonfly_max_latency = msg->saved_available_time;

        if(bf->c4)