slimfly.c 109 KB
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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

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

#include <ross.h>
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#include "codes/jenkins-hash.h"
#include "codes/codes_mapping.h"
#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
#include "codes/model-net-lp.h"
#include "codes/net/slimfly.h"
#include "sys/file.h"
#include "codes/quickhash.h"
#include "codes/rc-stack.h"

#define CREDIT_SIZE 8
#define MEAN_PROCESS 1.0

/* collective specific parameters */
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#define DFLY_HASH_TABLE_SIZE 5000
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// debugging parameters
#define TRACK 4
//#define TRACK 100001
#define TRACK_MSG 0
#define TRACK_OUTPUT 1
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#define DEBUG 0
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#define DEBUG_ROUTING 0
#define USE_DIRECT_SCHEME 1
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#define LOAD_FROM_FILE 0
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#define LP_CONFIG_NM (model_net_lp_config_names[SLIMFLY])
#define LP_METHOD_NM (model_net_method_names[SLIMFLY])

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/* Begin Visualization Piece */
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#define TERMINAL_SENDS_RECVS_LOG 0
#define ROUTER_SENDS_RECVS_LOG 0
#define TERMINAL_OCCUPANCY_LOG 0
#define ROUTER_OCCUPANCY_LOG 0
#define PARAMS_LOG 1
#define N_COLLECT_POINTS 100
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/*unsigned long terminal_sends[TEMP_NUM_TERMINALS][N_COLLECT_POINTS];
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unsigned long terminal_recvs[TEMP_NUM_TERMINALS][N_COLLECT_POINTS];
unsigned long router_sends[TEMP_NUM_ROUTERS][N_COLLECT_POINTS];
unsigned long router_recvs[TEMP_NUM_ROUTERS][N_COLLECT_POINTS];
int vc_occupancy_storage_router[TEMP_NUM_ROUTERS][TEMP_RADIX][TEMP_NUM_VC][N_COLLECT_POINTS];
int vc_occupancy_storage_terminal[TEMP_NUM_TERMINALS][TEMP_NUM_VC][N_COLLECT_POINTS];
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*/FILE * slimfly_terminal_sends_recvs_log = NULL;
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FILE * slimfly_router_sends_recvs_log = NULL;
FILE * slimfly_router_occupancy_log=NULL;
FILE * slimfly_terminal_occupancy_log=NULL;
FILE * slimfly_results_log=NULL;
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int TEMP_RADIX;
int TEMP_NUM_VC;
int slim_total_routers_noah;
int slim_total_terminals_noah;
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/* End Visualization Piece */
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/*Begin Misc*/
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FILE * MMS_input_file=NULL;
int csf_ratio = 1;						//Constant selected to balance the ratio between minimal and indirect routes
int num_indirect_routes = 4;			//Number of indirect (Valiant) routes to use in Adaptive routing methods
float adaptive_threshold = 0.1;
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float pe_throughput_percent = 0.0;
float pe_throughput = 0.0;
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int *X;
int *X_prime;
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int X_size;
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/*End Misc*/
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static double maxd(double a, double b) { return a < b ? b : a; }

/* minimal and non-minimal packet counts for adaptive routing*/
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static int minimal_count=0, nonmin_count=0;
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typedef struct slimfly_param slimfly_param;
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/* annotation-specific parameters (unannotated entry occurs at the
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 * last index) */
static uint64_t                  num_params = 0;
static slimfly_param         * all_params = NULL;
static const config_anno_map_t * anno_map   = NULL;

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

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

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

typedef struct slim_terminal_message_list slim_terminal_message_list;
struct slim_terminal_message_list {
    slim_terminal_message msg;
    char* event_data;
    slim_terminal_message_list *next;
    slim_terminal_message_list *prev;
};

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void slim_init_terminal_message_list(slim_terminal_message_list *this,
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    slim_terminal_message *inmsg) {
    this->msg = *inmsg;
    this->event_data = NULL;
    this->next = NULL;
    this->prev = NULL;
}

void slim_delete_terminal_message_list(slim_terminal_message_list *this) {
    if(this->event_data != NULL) free(this->event_data);
    free(this);
}

struct slimfly_param
{
    // configuration parameters
    int num_routers; 		/*NUM_ROUTER Number of routers in a group*/
    double local_bandwidth;	/*LOCAL_BANDWIDTH bandwidth of the router-router channels within a group */
    double global_bandwidth;/*GLOBAL_BANDWIDTH bandwidth of the inter-group router connections */
    double cn_bandwidth;	/*NODE_BANDWIDTH bandwidth of the compute node channels connected to routers */
    int num_vcs; 			/*NUM_VC number of virtual channels */
    int local_vc_size; 		/*LOCAL_VC_SIZE buffer size of the router-router channels */
    int global_vc_size; 	/*GLOBAL_VC_SIZE buffer size of the global channels */
    int cn_vc_size; 		/*TERMINAL_VC_SIZE buffer size of the compute node channels */
    int chunk_size; 		/*CHUNK_SIZE full-sized packets are broken into smaller chunks.*/
    // derived parameters
    int num_cn; 			/*NUM_TERMINALS*/
    int num_groups; 		/*No relation to slim fly*/
    int radix;				/*RADIX*/
    int slim_total_routers;
    int slim_total_terminals;
    int num_global_channels;
    double cn_delay;
    double local_delay;
    double global_delay;
    double credit_delay;
	//slimfly added
	double router_delay;	/*Router processing delay moving packet from input port to output port*/
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	double link_delay;		/*Network link latency. Currently encorporated into the arrival time*/
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	int num_local_channels;
};

struct sfly_hash_key
{
    uint64_t message_id;
    tw_lpid sender_id;
};

struct sfly_qhash_entry
{
   struct sfly_hash_key key;
   char * remote_event_data;
   int num_chunks;
   int remote_event_size;
   struct qhash_head hash_link;
};

/* 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;

/* slimfly compute node data structure */
struct terminal_state
{
   uint64_t packet_counter;

   // Dragonfly specific parameters
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   int router_id;
   int terminal_id;
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   // Each terminal will have an input and output channel with the router
   int* vc_occupancy; // NUM_VC
   int num_vcs;
   tw_stime terminal_available_time;
   slim_terminal_message_list **terminal_msgs;
   slim_terminal_message_list **terminal_msgs_tail;
   int in_send_loop;
// 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
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   struct mn_stats slimfly_stats_array[CATEGORY_MAX];
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   struct rc_stack * st;
   int issueIdle;
   int terminal_length;

   const char * anno;
   const slimfly_param *params;

   struct qhash_table *rank_tbl;
   uint64_t rank_tbl_pop;

   tw_stime   total_time;
   long total_msg_size;
   long total_hops;
   long finished_msgs;
   long finished_chunks;
   long finished_packets;

   char output_buf[512];
};

/* 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
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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
{
    MINIMAL = 0,
    NON_MINIMAL,
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    ADAPTIVE
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};

struct router_state
{
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   int router_id;
   int group_id;
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   int* global_channel;
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   int* local_channel;
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   tw_stime* next_output_available_time;
   slim_terminal_message_list ***pending_msgs;
   slim_terminal_message_list ***pending_msgs_tail;
   slim_terminal_message_list ***queued_msgs;
   slim_terminal_message_list ***queued_msgs_tail;
   int *in_send_loop;
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   int** vc_occupancy;
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   int* link_traffic;	//Aren't used
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   const char * anno;
   const slimfly_param *params;

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   int* prev_hist_num;	//Aren't used
   int* cur_hist_num;	//Aren't used
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};

static short routing = MINIMAL;

static tw_stime         slimfly_total_time = 0;
static tw_stime         slimfly_max_latency = 0;

static long long       total_hops = 0;
static long long       N_finished_packets = 0;
static long long       total_msg_sz = 0;
static long long       N_finished_msgs = 0;
static long long       N_finished_chunks = 0;

static int slimfly_rank_hash_compare(
        void *key, struct qhash_head *link)
{
    struct sfly_hash_key *message_key = (struct sfly_hash_key *)key;
    struct sfly_qhash_entry *tmp;

    tmp = qhash_entry(link, struct sfly_qhash_entry, hash_link);
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    if (tmp->key.message_id == message_key->message_id
            && tmp->key.sender_id == message_key->sender_id)
        return 1;

    return 0;
}
static int slimfly_hash_func(void *k, int table_size)
{
	struct sfly_hash_key *tmp = (struct sfly_hash_key *)k;
	uint64_t key = (~tmp->message_id) + (tmp->message_id << 18);
	key = key * 21;
	key = ~key ^ (tmp->sender_id >> 4);
	key = key * tmp->sender_id;
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	return (int)(key % table_size);
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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);
}

/* returns the slimfly message size */
static int slimfly_get_msg_sz(void)
{
	   return sizeof(slim_terminal_message);
}

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/*static void free_tmp(void * ptr)
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{
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    struct sfly_qhash_entry * sfly = ptr;
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    free(sfly->remote_event_data);
    free(sfly);
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}*/
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static void append_to_terminal_message_list(
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        slim_terminal_message_list ** thisq,
        slim_terminal_message_list ** thistail,
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        int index,
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        slim_terminal_message_list *msg) {
    if(thisq[index] == NULL) {
        thisq[index] = msg;
    } else {
        thistail[index]->next = msg;
        msg->prev = thistail[index];
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    }
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    thistail[index] = msg;
}

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

static void create_prepend_to_terminal_message_list(
        slim_terminal_message_list ** thisq,
        slim_terminal_message_list ** thistail,
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        int index,
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        slim_terminal_message *msg) {
    slim_terminal_message_list* new_entry = (slim_terminal_message_list*)malloc(
        sizeof(slim_terminal_message_list));
    slim_init_terminal_message_list(new_entry, msg);
    if(msg->remote_event_size_bytes) {
        void *m_data = model_net_method_get_edata(SLIMFLY, msg);
        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);
    }
    prepend_to_terminal_message_list( thisq, thistail, index, new_entry);
}

static slim_terminal_message_list* return_head(
        slim_terminal_message_list ** thisq,
        slim_terminal_message_list ** thistail,
        int index) {
    slim_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;
}

static slim_terminal_message_list* return_tail(
        slim_terminal_message_list ** thisq,
        slim_terminal_message_list ** thistail,
        int index) {
    slim_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;
}

static void copy_terminal_list_entry( slim_terminal_message_list *cur_entry,
    slim_terminal_message *msg) {
    slim_terminal_message *cur_msg = &cur_entry->msg;
    msg->travel_start_time = cur_msg->travel_start_time;
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    msg->packet_ID = cur_msg->packet_ID;
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    strcpy(msg->category, cur_msg->category);
    msg->final_dest_gid = cur_msg->final_dest_gid;
    msg->msg_start_time = msg->msg_start_time;
    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->intm_router_id = cur_msg->intm_router_id;
    msg->chunk_id = cur_msg->chunk_id;
    msg->sender_mn_lp = cur_msg->sender_mn_lp;
    msg->total_size = cur_msg->total_size;
    msg->packet_size = cur_msg->packet_size;
    msg->message_id = cur_msg->message_id;
    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(SLIMFLY, msg);
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        memcpy(m_data, cur_entry->event_data,
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            msg->local_event_size_bytes +  msg->remote_event_size_bytes);
    }
}
static void slimfly_read_config(const char * anno, slimfly_param *params){
    // shorthand
    slimfly_param *p = params;

    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) {
        p->num_vcs = 4;
        fprintf(stderr, "Virtual channel size 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 = 512;
        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);
    }

    configuration_get_value_int(&config, "PARAMS", "local_channels", anno, &p->num_local_channels);
    if(!p->num_local_channels) {
        p->num_local_channels = 2;
        fprintf(stderr, "Number of Local channels not specified, setting to %d\n", p->num_local_channels);
    }

    configuration_get_value_int(&config, "PARAMS", "global_channels", anno, &p->num_global_channels);
    if(!p->num_global_channels) {
        p->num_global_channels = 2;
        fprintf(stderr, "Number of Global channels not specified, setting to %d\n", p->num_global_channels);
    }

    configuration_get_value_int(&config, "PARAMS", "num_terminals", anno, &p->num_cn);
    if(!p->num_cn) {
        p->num_cn = 2;
        fprintf(stderr, "Number of terminals not specified, setting to %d\n", p->num_cn);
    }

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	p->router_delay = -1;
    configuration_get_value_double(&config, "PARAMS", "router_delay", anno, &p->router_delay);
    if(p->router_delay < 0) {
        p->router_delay = 0;
        fprintf(stderr, "Router delay not specified, setting to %lf\n", p->router_delay);
    }
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	char       **values;
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    size_t       length;
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	int ret = configuration_get_multivalue(&config, "PARAMS", "generator_set_X", anno, &values, &length);
    if (ret != 1)
        tw_error(TW_LOC, "unable to read PARAMS:generator_set_X\n");
	if (length < 2)
		fprintf(stderr, "generator set X less than 2 elements\n");

    X = (int*)malloc(sizeof(int)*length);
    for (size_t i = 0; i < length; i++)
    {
        X[i] = atoi(values[i]);
    }
    free(values);

	ret = configuration_get_multivalue(&config, "PARAMS", "generator_set_X_prime", anno, &values, &length);
    if (ret != 1)
        tw_error(TW_LOC, "unable to read PARAMS:generator_set_X_prime\n");
	if (length < 2)
		fprintf(stderr, "generator set  X_prime less than 2 elements\n");

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	X_size = length;
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    X_prime = (int*)malloc(sizeof(int)*length);
    for (size_t i = 0; i < length; i++)
    {
        X_prime[i] = atoi(values[i]);
    }
    free(values);

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

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	TEMP_RADIX = p->num_local_channels + p->num_global_channels + p->num_cn;
	TEMP_NUM_VC = p->num_vcs;

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    // set the derived parameters
    p->num_groups = p->num_routers * 2;
    p->radix = (p->num_cn + p->num_global_channels + p->num_local_channels);
    p->slim_total_routers = p->num_groups * p->num_routers;
    p->slim_total_terminals = p->slim_total_routers * p->num_cn;
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	slim_total_routers_noah = p->num_groups * p->num_routers;
	slim_total_terminals_noah = p->slim_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 total routers %d total groups %d num_terminals %d num_routers %d radix %d local_channels %d global_channels %d \n",
                p->num_cn * p->slim_total_routers, p->slim_total_routers, p->num_groups, p->num_cn, p->num_routers,
                p->radix, p->num_local_channels, p->num_global_channels);
    }
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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

}

static void slimfly_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));

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

/* report slimfly statistics like average and maximum packet latency, average number of hops traversed */
static void slimfly_report_stats()
{
   long long avg_hops, total_finished_packets, total_finished_chunks;
   long long total_finished_msgs, final_msg_sz;
   tw_stime avg_time, max_time;
   int total_minimal_packets, total_nonmin_packets;
   float throughput_avg = 0.0;
   float throughput_avg2 = 0.0;
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   char log[300];
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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( &N_finished_msgs, &total_finished_msgs, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &N_finished_chunks, &total_finished_chunks, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &total_msg_sz, &final_msg_sz, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &slimfly_total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &slimfly_max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);

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   MPI_Reduce(&pe_throughput_percent, &throughput_avg, 1, MPI_FLOAT, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce(&pe_throughput, &throughput_avg2, 1, MPI_FLOAT, MPI_SUM, 0, MPI_COMM_WORLD);

   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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   /* print statistics */
   if(!g_tw_mynode)
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   {
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      printf(" Average number of hops traversed %f average chunk latency %lf us maximum chunk latency %lf us avg message size %lf bytes finished messages %lld \n", (float)avg_hops/total_finished_chunks, avg_time/(total_finished_chunks*1000), max_time/1000, (float)final_msg_sz/total_finished_msgs, total_finished_msgs);
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#if PARAMS_LOG
    throughput_avg = throughput_avg / (float)slim_total_terminals_noah;
    throughput_avg2 = throughput_avg2 / (float)slim_total_terminals_noah;
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	//Open file to append simulation results
	sprintf( log, "slimfly-results-log.txt");
	slimfly_results_log=fopen(log, "a");
	if(slimfly_results_log == NULL)
		tw_error(TW_LOC, "\n Failed to open slimfly results log file \n");
	printf("Printing Simulation Parameters/Results Log File\n");
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	fprintf(slimfly_results_log,"%10.3lf, %15.3lf, %11.3lf, %13.3d, %16.3d, %16.3lld, %25.5f, %14.5f, ", (float)avg_hops/total_finished_packets, avg_time/(total_finished_packets),max_time,total_minimal_packets,total_nonmin_packets,total_finished_chunks,throughput_avg*100,throughput_avg2);
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	fclose(slimfly_results_log);
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#endif
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  }

#if ROUTER_OCCUPANCY_LOG
	if(tw_ismaster())
	{
		printf("Printing Realtime Router Occupancy Log Files\n");
		for(k=0; k<slim_total_routers_noah; k++)
		{
			sprintf( log, "vc-occupancy/routers/slimfly_router_occupancy_log.%d.txt", k );
			slimfly_router_occupancy_log=fopen(log, "w+");
			if(slimfly_router_occupancy_log == NULL)
				tw_error(TW_LOC, "\n Failed to open slimfly router occupancy log file \n");

			for( t=0; t<N_COLLECT_POINTS; t++ )
			{
				if(t == 0)
				{
					fprintf(slimfly_router_occupancy_log, "%d, ",t*100/N_COLLECT_POINTS);
				}
				else
				{
					fprintf(slimfly_router_occupancy_log, "\n%d, ",t*100/N_COLLECT_POINTS);
				}
				for( j=0; j<TEMP_RADIX; j++)
				{
					for(i=0; i<TEMP_NUM_VC; i++)
					{
						if( k==0 && t==0)
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							printf("k:%d, j:%d, i:%d, t:%d\n",k,j,i,t);
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						fprintf(slimfly_router_occupancy_log, "%d, ", vc_occupancy_storage_router[k][j][i][t]);
					}
				}
			}
		}
	}
	fclose(slimfly_router_occupancy_log);
#endif

#if TERMINAL_OCCUPANCY_LOG
	if(tw_ismaster())
	{
		printf("Printing Realtime Terminal Occupancy Log Files\n");
		for(k=0; k<slim_total_terminals_noah; k++)
		{
			sprintf( log, "vc-occupancy/terminals/slimfly_terminal_occupancy_log.%d.txt", k );
			slimfly_terminal_occupancy_log=fopen(log, "w+");
			if(slimfly_terminal_occupancy_log == NULL)
			{
				printf("Failed to open slimfly terminal occupancy log file vc-occupancy/terminals/slimfly_terminal_occupancy_log.%d.txt\n",k);
				tw_error(TW_LOC, "\n Failed to open slimfly terminal occupancy log file \n");
			}

			for( i=0; i<N_COLLECT_POINTS; i++ )
			{
				if(i == 0)
				{
					fprintf(slimfly_terminal_occupancy_log, "%d, ",i*100/N_COLLECT_POINTS);
				}
				else
				{
					fprintf(slimfly_terminal_occupancy_log, "\n%d, ",i*100/N_COLLECT_POINTS);
				}
				for( j=0; j<1; j++)
				{
					fprintf(slimfly_terminal_occupancy_log, "%d, ", vc_occupancy_storage_terminal[k][j][i]);
				}
			}
		}
	}
	fclose(slimfly_terminal_occupancy_log);
#endif

#if TERMINAL_SENDS_RECVS_LOG
       if(tw_ismaster())
       {
               printf("Printing Realtime Terminal sends & recvs Log Files\n");
               sprintf( log, "slimfly_terminal_sends_recvs_log.txt");
               slimfly_terminal_sends_recvs_log=fopen(log, "w+");
               if(slimfly_terminal_sends_recvs_log == NULL)
                       tw_error(TW_LOC, "\n Failed to open slimfly terminal sends & recvs log file \n");
               for( i=0; i<N_COLLECT_POINTS; i++ )
               {
                       fprintf(slimfly_terminal_sends_recvs_log, "%d",i*100/N_COLLECT_POINTS);
                       for(j=0; j<slim_total_terminals_noah; j++)
                       {
                               fprintf(slimfly_terminal_sends_recvs_log, ", %lu", terminal_sends[j][i]);
                               fprintf(slimfly_terminal_sends_recvs_log, ", %lu", terminal_recvs[j][i]);
                       }
                       fprintf(slimfly_terminal_sends_recvs_log, "\n");
               }
       }
	fclose(slimfly_terminal_sends_recvs_log);
#endif

#if ROUTER_SENDS_RECVS_LOG
       if(tw_ismaster())
       {
               printf("Printing Realtime Router ROUTER sends & recvs Log Files\n");
               sprintf( log, "slimfly_router_sends_recvs_log.txt");
               slimfly_router_sends_recvs_log=fopen(log, "w+");
               if(slimfly_router_sends_recvs_log == NULL)
                       tw_error(TW_LOC, "\n Failed to open slimfly router sends & recvs log file \n");
               for( i=0; i<N_COLLECT_POINTS; i++ )
               {
                       fprintf(slimfly_router_sends_recvs_log, "%d",i*100/N_COLLECT_POINTS);
                       for(j=0; j<slim_total_routers_noah; j++)
                       {
                               fprintf(slimfly_router_sends_recvs_log, ", %lu", router_sends[j][i]);
                               fprintf(slimfly_router_sends_recvs_log, ", %lu", router_recvs[j][i]);
                       }
                       fprintf(slimfly_router_sends_recvs_log, "\n");
               }
       }
	fclose(slimfly_router_sends_recvs_log);
#endif

   return;
}

/* initialize a slimfly compute node terminal */
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void slim_terminal_init( terminal_state * s,
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	       tw_lp * lp )
{
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    uint32_t h1 = 0, h2 = 0;
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    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    slim_terminal_magic_num = h1 + h2;
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    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);

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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 / (num_lps);
   s->terminal_available_time = 0.0;
   s->packet_counter = 0;
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   s->finished_msgs = 0;
   s->finished_chunks = 0;
   s->finished_packets = 0;
   s->total_time = 0.0;
   s->total_msg_size = 0;

   rc_stack_create(&s->st);
   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;
    }

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    s->rank_tbl = NULL;
//   if(!s->rank_tbl)
//       tw_error(TW_LOC, "\n Hash table not initialized! ");
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   s->terminal_msgs =
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       (slim_terminal_message_list**)malloc(1*sizeof(slim_terminal_message_list*));
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   s->terminal_msgs_tail =
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       (slim_terminal_message_list**)malloc(1*sizeof(slim_terminal_message_list*));
   s->terminal_msgs[0] = NULL;
   s->terminal_msgs_tail[0] = NULL;
   s->terminal_length = 0;
   s->in_send_loop = 0;
   s->issueIdle = 0;

   return;
}


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/* sets up the router virtual channels, global channels,
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 * local channels, compute node channels */
void slim_router_setup(router_state * r, tw_lp * lp)
{
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    uint32_t h1 = 0, h2 = 0;
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    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    slim_router_magic_num = h1 + h2;
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    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 slimfly_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->local_channel = (int*)malloc(p->num_local_channels * sizeof(int));
   r->next_output_available_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));
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   r->vc_occupancy = (int**)malloc(p->radix * sizeof(int*));
   r->in_send_loop = (int*)malloc(p->radix * sizeof(int));
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   r->pending_msgs =
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    (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
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   r->pending_msgs_tail =
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    (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
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   r->queued_msgs =
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    (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
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   r->queued_msgs_tail =
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    (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
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   for(int i=0; i < p->radix; i++)
    {
       // Set credit & router occupancy
	r->next_output_available_time[i]=0;
        r->link_traffic[i]=0;
	r->cur_hist_num[i] = 0;
	r->prev_hist_num[i] = 0;
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        r->in_send_loop[i] = 0;
        r->vc_occupancy[i] = (int*)malloc(p->num_vcs * sizeof(int));
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        r->pending_msgs[i] = (slim_terminal_message_list**)malloc(p->num_vcs *
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            sizeof(slim_terminal_message_list*));
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        r->pending_msgs_tail[i] = (slim_terminal_message_list**)malloc(p->num_vcs *
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            sizeof(slim_terminal_message_list*));
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        r->queued_msgs[i] = (slim_terminal_message_list**)malloc(p->num_vcs *
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            sizeof(slim_terminal_message_list*));
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        r->queued_msgs_tail[i] = (slim_terminal_message_list**)malloc(p->num_vcs *
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            sizeof(slim_terminal_message_list*));
        for(int j = 0; j < p->num_vcs; j++) {
            r->vc_occupancy[i][j] = 0;
            r->pending_msgs[i][j] = NULL;
            r->pending_msgs_tail[i][j] = NULL;
            r->queued_msgs[i][j] = NULL;
            r->queued_msgs_tail[i][j] = NULL;
        }
    }

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#if LOAD_FROM_FILE
    //Load input MMS router and node layout/connection graph from file
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	char log[500];
    sprintf( log, "simulation-input-files/MMS.%d/MMS.%d.%d.bsconf", p->num_global_channels+p->num_local_channels, p->num_global_channels+p->num_local_channels, p->num_cn);
    MMS_input_file = fopen( log, "r");
    if( MMS_input_file == NULL )
        tw_error( TW_LOC, "Failed to Open Slim_fly input MMS layout file: %s The reason *may* have been %s\n",log,strerror(errno));

	int i,j;
	rewind(MMS_input_file);
	char one_word[16];
	int one_number = 0;
	int temp;
	//Skip over preceeding lines
	for(i=0;i<r->router_id;i++)
	{
		for(j=0;j<=p->num_local_channels+p->num_global_channels+p->num_cn;j++)
		{
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			temp = fscanf(MMS_input_file,"%s",one_word); // got one word from the file
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			temp = fscanf(MMS_input_file,"%d",&one_number);
		}
	}
	//Skip over self in MMS file
	temp = fscanf(MMS_input_file,"%s",one_word); // got one word from the file /
	temp = fscanf(MMS_input_file,"%d",&one_number);
	//Assign Local router connections
	for(i=0;i<p->num_local_channels;i++)
	{
		temp = fscanf(MMS_input_file,"%s",one_word); // got one word from the file /
		temp = fscanf(MMS_input_file,"%d",&one_number);
		r->local_channel[i] = one_number;
	}
	//Set global router connections according to input MMS file
	for(i=0;i<p->num_global_channels;i++)
	{
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		temp = fscanf(MMS_input_file,"%s",one_word); // got one word from the file
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		temp = fscanf(MMS_input_file,"%d",&one_number);
		r->global_channel[i] = one_number;
	}
	fclose(MMS_input_file);

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#else
    //Compute MMS router layout/connection graph
	int rid_s = (int)r->router_id;	// ID for source router
	int rid_d;						// ID for dest. router
	int s_s,s_d;					// subgraph location for source and destination routers
	int i_s,i_d;					// x or m coordinates for source and destination routers
	int j_s,j_d; 					// y or c coordinates for source and destination routers
	int k;
	int local_idx = 0;
	int global_idx = 0;
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	int generator_size = X_size;
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	for(rid_d=0;rid_d<r->params->slim_total_routers;rid_d++)
	{
		// Decompose source and destination Router IDs into 3D subgraph coordinates (subgraph,i,j)
		if(rid_d >= r->params->slim_total_routers/2)
		{
			s_d = 1;
			i_d = (rid_d - r->params->slim_total_routers/2) /  r->params->num_global_channels;
			j_d = (rid_d - r->params->slim_total_routers/2) %  r->params->num_global_channels;
		}
		else
		{
			s_d = 0;
			i_d = rid_d /  r->params->num_global_channels;
			j_d = rid_d %  r->params->num_global_channels;
		}
		if(rid_s >= r->params->slim_total_routers/2)
		{
			s_s = 1;
			i_s = (rid_s - r->params->slim_total_routers/2) /  r->params->num_global_channels;
			j_s = (rid_s - r->params->slim_total_routers/2) %  r->params->num_global_channels;
		}
		else
		{
			s_s = 0;
			i_s = rid_s /  r->params->num_global_channels;
			j_s = rid_s %  r->params->num_global_channels;
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		}
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		// Check for subgraph 0 local connections
		if(s_s==0 && s_d==0)
		{
			if(i_s==i_d)							// equation (2) y-y' is in X'
			{
				for(k=0;k<generator_size;k++)
				{
					if(abs(j_s-j_d)==X[k])
					{
						r->local_channel[local_idx++] = rid_d;
					}
				}
			}
		}
		// Check if global connections
		if(s_s==0 && s_d==1)
		{
			if(j_s == (i_d*i_s + j_d) % r->params->num_routers)							// equation (3) y=mx+c
			{
				r->global_channel[global_idx++] = rid_d;
			}
		}
	}

	// Loop over second subgraph source routers
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	for(rid_d=r->params->slim_total_routers-1;rid_d>=0;rid_d--)
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	{
		// Decompose source and destination Router IDs into 3D subgraph coordinates (subgraph,i,j)
		if(rid_d >= r->params->slim_total_routers/2)
		{
			s_d = 1;
			i_d = (rid_d -  r->params->slim_total_routers/2) /  r->params->num_global_channels;
			j_d = (rid_d -  r->params->slim_total_routers/2) %  r->params->num_global_channels;
		}
		else
		{
			s_d = 0;
			i_d = rid_d /  r->params->num_global_channels;
			j_d = rid_d %  r->params->num_global_channels;
		}
		if(rid_s >= r->params->slim_total_routers/2)
		{
			s_s = 1;
			i_s = (rid_s -  r->params->slim_total_routers/2) /  r->params->num_global_channels;
			j_s = (rid_s -  r->params->slim_total_routers/2) %  r->params->num_global_channels;
		}
		else
		{
			s_s = 0;
			i_s = rid_s /  r->params->num_global_channels;
			j_s = rid_s %  r->params->num_global_channels;
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		}
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		// Check for subgraph 1 local connections
		if(s_s==1 && s_d==1)
		{
			if(i_s==i_d)							// equation (2) c-c' is in X'
			{
				for(k=0;k<generator_size;k++)
				{
					if(abs(j_s-j_d)==X_prime[k])
					{
						r->local_channel[local_idx++] = rid_d;
					}
				}
			}
		}
		// Check if global connections
		if(s_s==1 && s_d==0)
		{
			if(j_d == (i_s*i_d + j_s) %  r->params->num_routers)							// equation (3) y=mx+c
			{
				r->global_channel[global_idx++] = rid_d;
			}
		}
	}
#endif

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   return;
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}
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/* slimfly packet event , generates a slimfly packet on the compute node */
static tw_stime slimfly_packet_event(
        model_net_request const * req,
        uint64_t message_offset,
        uint64_t packet_size,
        tw_stime offset,
        mn_sched_params const * sched_params,
        void const * remote_event,
        void const * self_event,
        tw_lp *sender,
        int is_last_pckt)
{
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    (void)message_offset;
    (void)sched_params;

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    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    slim_terminal_message * msg;
    char* tmp_ptr;

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    xfer_to_nic_time = codes_local_latency(sender);
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    //e_new = tw_event_new(sender->gid, xfer_to_nic_time+offset, sender);
    //msg = tw_event_data(e_new);
    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, SLIMFLY, (void**)&msg, (void**)&tmp_ptr);
    strcpy(msg->category, req->category);
    msg->final_dest_gid = req->final_dest_lp;
    msg->total_size = req->msg_size;
    msg->sender_lp=req->src_lp;
    msg->sender_mn_lp = sender->gid;
    msg->packet_size = packet_size;
    msg->travel_start_time = tw_now(sender);
    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
    msg->type = T_GENERATE;
    msg->dest_terminal_id = req->dest_mn_lp;
    msg->message_id = req->msg_id;
    msg->is_pull = req->is_pull;
    msg->pull_size = req->pull_size;
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    msg->magic = slim_terminal_magic_num;
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    msg->msg_start_time = req->msg_start_time;

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

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

/* given two group IDs, find the router of the src_gid that connects to the dest_gid*/
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tw_lpid slim_getRouterFromGroupID(int dest_gid,
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		    int src_gid,
		    int num_routers,
                    int total_groups)
{
#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
  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);

  // 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;
#endif
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}
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/*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*/
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void slim_router_credit_send(router_state * s, tw_bf * bf, slim_terminal_message * msg, tw_lp * lp, int sq)
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{
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  (void)bf;

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  tw_event * buf_e;
  tw_stime ts;
  slim_terminal_message * buf_msg;

  int dest = 0,  type = R_BUFFER;
  int is_terminal = 0;

  const slimfly_param *p = s->params;
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  // 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");

#if TRACK_OUTPUT
	if( msg->packet_ID == TRACK )
	{
		printf("sending credit to gid:%d\n",dest);
	}
#endif

  ts = g_tw_lookahead + p->credit_delay +  tw_rand_unif(lp->rng);
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  if (is_terminal) {
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    buf_e = model_net_method_event_new(dest, ts, lp, SLIMFLY,
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      (void**)&buf_msg, NULL);
    buf_msg->magic = slim_terminal_magic_num;
  } else {
    buf_e = tw_event_new(dest, ts , lp);
    buf_msg = tw_event_data(buf_e);
    buf_msg->magic = slim_router_magic_num;
  }
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  if(sq == -1) {
    buf_msg->vc_index = msg->vc_index;
    buf_msg->output_chan = msg->output_chan;
  } else {
    buf_msg->vc_index = msg->saved_vc;
    buf_msg->output_chan = msg->saved_channel;
  }
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  buf_msg->type = type;

  tw_event_send(buf_e);
  return;
}

void slim_packet_generate_rc(terminal_state * s, tw_bf * bf, slim_terminal_message * msg, tw_lp * lp)
{
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	tw_rand_reverse_unif(lp->rng);
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	int num_chunks = msg->packet_size/s->params->chunk_size;
	if(msg->packet_size % s->params->chunk_size)
		num_chunks++;
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	if(!num_chunks)
		num_chunks = 1;
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	int i;
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	for(i = 0; i < num_chunks; i++)
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	{
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		slim_delete_terminal_message_list(return_tail(s->terminal_msgs,
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		s->terminal_msgs_tail, 0));
		s->terminal_length -= s->params->chunk_size;
	}
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	if(bf->c5)
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	{
		codes_local_latency_reverse(lp);
		s->in_send_loop = 0;
	}
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	if(bf->c11)
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	{
		s->issueIdle = 0;
	}
	struct mn_stats* stat;
	stat = model_net_find_stats(msg->category, s->slimfly_stats_array);
	stat->send_count--;
	stat->send_bytes -= msg->packet_size;
	stat->send_time -= (1/s->params->cn_bandwidth) * msg->packet_size;
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}

/* generates packet at the current slimfly compute node */
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void slim_packet_generate(terminal_state * s, tw_bf * bf, slim_terminal_message * msg, tw_lp * lp)
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{
	tw_stime ts, nic_ts;
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	assert(lp->gid != msg->dest_terminal_id);
	const slimfly_param *p = s->params;
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	int i, total_event_size;
	int num_chunks = msg->packet_size / p->chunk_size;
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	if (msg->packet_size % s->params->chunk_size)
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		num_chunks++;
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	if(!num_chunks)
		num_chunks = 1;
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	nic_ts = g_tw_lookahead + s->params->cn_delay * msg->packet_size + tw_rand_unif(lp->rng);
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	msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter;
	msg->my_N_hop = 0;
	msg->my_l_hop = 0;
	msg->my_g_hop = 0;
	msg->intm_group_id = -1;
	msg->intm_router_id = -1;
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	if(msg->packet_ID == TRACK)
		printf("\x1B[34m-->Packet generated at terminal %d sending to router %d \x1b[0m\n", (int)lp->gid, s->router_id);
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	for(i = 0; i < num_chunks; i++)
	{
		slim_terminal_message_list *cur_chunk = (slim_terminal_message_list*)malloc(
		sizeof(slim_terminal_message_list));
		slim_init_terminal_message_list(cur_chunk, msg);
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		if(msg->remote_event_size_bytes + msg->local_event_size_bytes > 0)
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		{
			cur_chunk->event_data = (char*)malloc(
			msg->remote_event_size_bytes + msg->local_event_size_bytes);
		}
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		void * m_data_src = model_net_method_get_edata(SLIMFLY, 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)
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		{
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			m_data_src = (char*)m_data_src + msg->remote_event_size_bytes;
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			memcpy((char*)cur_chunk->event_data + msg->remote_event_size_bytes,
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			m_data_src, msg->local_event_size_bytes);
		}
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		cur_chunk->msg.chunk_id = i;
		append_to_terminal_message_list(s->terminal_msgs, s->terminal_msgs_tail,
		0, cur_chunk);
		s->terminal_length += s->params->chunk_size;
	}
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	if(s->terminal_length < 2 * s->params->cn_vc_size)
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	{
		model_net_method_idle_event(nic_ts, 0, lp);
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	}
	else
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	{
		bf->c11 = 1;
		s->issueIdle = 1;
	}

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	if(s->in_send_loop == 0)
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	{
		bf->c5 = 1;
		ts = codes_local_latency(lp);
		slim_terminal_message *m;
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		tw_event* e = model_net_method_event_new(lp->gid, ts, lp, SLIMFLY,
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		(void**)&m, NULL);
		m->type = T_SEND;
		m->magic = slim_terminal_magic_num;
		s->in_send_loop = 1;
		tw_event_send(e);
	}

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	total_event_size = model_net_get_msg_sz(SLIMFLY) +
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	msg->remote_event_size_bytes + msg->local_event_size_bytes;
	mn_stats* stat;
	stat = model_net_find_stats(msg->category, s->slimfly_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)
		stat->max_event_size = total_event_size;

	return;
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}

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void slim_packet_send_rc(terminal_state * s, tw_bf * bf, slim_terminal_message * msg, tw_lp * lp)
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{
      if(bf->c1) {
        s->in_send_loop = 1;
        return;
      }
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      tw_rand_reverse_unif(lp->rng);
      s->terminal_available_time = msg->saved_available_time;
      if(bf->c2) {
        codes_local_latency_reverse(lp);
      }
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      s->terminal_length += s->params->chunk_size;
      s->packet_counter--;
      s->vc_occupancy[0] -= s->params->chunk_size;

      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;
      }
      if(bf->c5)
      {
          codes_local_latency_reverse(lp);
          s->issueIdle = 1;
      }
      return;
}
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/* sends the packet from the current slimfly compute node to the attached router */
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void slim_packet_send(terminal_state * s, tw_bf * bf, slim_terminal_message * msg,
  tw_lp * lp)
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{
	tw_stime ts;
	tw_event *e;
	slim_terminal_message *m;
	tw_lpid router_id;
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	slim_terminal_message_list* cur_entry = s->terminal_msgs[0];
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	if(s->vc_occupancy[0] + s->params->chunk_size > s->params->cn_vc_size
	|| cur_entry == NULL)
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	{
		bf->c1 = 1;
		s->in_send_loop = 0;
		return;
	}
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	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;
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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, "slimfly_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(slim_terminal_message));
	if (m->remote_event_size_bytes)
	{
		memcpy(model_net_method_get_edata(SLIMFLY, m), cur_entry->event_data,
		m->remote_event_size_bytes);
	}
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	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->intm_router_id = -1;
	m->magic = slim_router_magic_num;
	m->path_type = -1;
	m->local_event_size_bytes = 0;
	m->local_id = s->terminal_id;
	tw_event_send(e);
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#if DEBUG
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	if( m->packet_ID == TRACK)
	{
		printf( "(%lf) [Terminal %d] packet_ID %lld message_ID %d is sending. ",tw_now(lp), (int)lp->gid, m->packet_ID, (int)m->message_id);
		printf("travel start time is %f. ", m->travel_start_time);
		printf("My hop now is %d\n",m->my_N_hop);
	}
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#endif

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#if TERMINAL_SENDS_RECVS_LOG || TERMINAL_OCCUPANCY_LOG
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	int index = floor(N_COLLECT_POINTS*(tw_now(lp)/g_tw_ts_end));
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#endif

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#if TERMINAL_SENDS_RECVS_LOG
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	terminal_sends[s->terminal_id][index]++;
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#endif

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	int num_chunks = cur_entry->msg.packet_size/s->params->chunk_size;
	if(cur_entry->msg.packet_size % s->params->chunk_size)
		num_chunks++;
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	if(!num_chunks)
		num_chunks = 1;
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	if(cur_entry->msg.chunk_id == num_chunks - 1 && (cur_entry->msg.local_event_size_bytes > 0))
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	{
		bf->c2 = 1;
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		ts = codes_local_latency(lp);
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		tw_event *e_new = tw_event_new(cur_entry->msg.sender_lp, ts, lp);
		slim_terminal_message* m_new = tw_event_data(e_new);
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		void *local_event = (char*)cur_entry->event_data +
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		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;
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#if TERMINAL_OCCUPANCY_LOG
	vc_occupancy_storage_terminal[s->terminal_id][0][index] = s->vc_occupancy[0]/s->params->chunk_size;
#endif
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	cur_entry = return_head(s->terminal_msgs, s->terminal_msgs_tail, 0);
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	copy_terminal_list_entry(cur_entry, msg);
	slim_delete_terminal_message_list(cur_entry);
	s->terminal_length -= s->params->chunk_size;
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	cur_entry = s->terminal_msgs[0];

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	if(cur_entry != NULL && s->vc_occupancy[0] + s->params->chunk_size <= s->params->cn_vc_size)
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	{
		bf->c3 = 1;
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		slim_terminal_message *m_new;
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		ts = g_tw_lookahead + s->params->cn_delay + tw_rand_unif(lp->rng);
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		tw_event* e_new = model_net_method_event_new(lp->gid, ts, lp, SLIMFLY,
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		(void**)&m_new, NULL);
		m_new->type = T_SEND;
		m_new->magic = slim_terminal_magic_num;
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		tw_event_send(e_new);
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	}
	else
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	{
		bf->c4 = 1;
		s->in_send_loop = 0;
	}
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	if(s->issueIdle)
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	{
		bf->c5 = 1;
		s->issueIdle = 0;
		model_net_method_idle_event(codes_local_latency(lp), 0, lp);
	}
	return;
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}

void slim_packet_arrive_rc(terminal_state * s, tw_bf * bf, slim_terminal_message * msg, tw_lp * lp)
{
      tw_rand_reverse_unif(lp->rng);
      if(msg->path_type == MINIMAL)
        minimal_count--;
      if(msg->path_type == NON_MINIMAL)
        nonmin_count--;

      N_finished_chunks--;
      s->finished_chunks--;

      total_hops -= msg->my_N_hop;
       s->total_hops -= msg->my_N_hop;
       slimfly_total_time -= (tw_now(lp) - msg->travel_start_time);
       s->total_time = msg->saved_avg_time;
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