slimfly.c 120 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 SLIMFLY_HASH_TABLE_SIZE 65536
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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
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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
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#define PARAMS_LOG 0
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#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) {
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    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;
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    //slimfly added
    double router_delay;	/*Router processing delay moving packet from input port to output port*/
    double link_delay;		/*Network link latency. Currently encorporated into the arrival time*/
    int num_local_channels;
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};

struct sfly_hash_key
{
    uint64_t message_id;
    tw_lpid sender_id;
};

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

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

    int router_id;
    int terminal_id;

    // 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
    struct mn_stats slimfly_stats_array[CATEGORY_MAX];

    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;

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    tw_stime * last_buf_full;
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    tw_stime busy_time;

    char output_buf[512];
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};

/* terminal event type (1-4) */
enum event_t
{
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    T_GENERATE=1,
    T_ARRIVE,
    T_SEND,
    T_BUFFER,
    R_SEND,
    R_ARRIVE,
    R_BUFFER
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};
/* status of a virtual channel can be idle, active, allocated or wait for credit */
enum vc_status
{
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    VC_IDLE,
    VC_ACTIVE,
    VC_ALLOC,
    VC_CREDIT
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};

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

/* 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;
    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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    struct rc_stack * st;
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    tw_stime** last_buf_full;
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    tw_stime* busy_time;
    tw_stime* busy_time_sample;
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    char output_buf[4096];
    char output_buf2[4096];
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    int** vc_occupancy;
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    int64_t* 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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};

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/* ROSS Instrumentation Support */
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struct slimfly_cn_sample
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{
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   tw_lpid terminal_id;
   tw_stime end_time;
   int vc_occupancy; // will sum occupancy for all vc
};

struct slimfly_router_sample
{
   tw_lpid router_id;
   int* vc_occupancy; // sum for all vc for each port
   tw_stime end_time;
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};

void slimfly_event_collect(slim_terminal_message *m, tw_lp *lp, char *buffer, int *collect_flag);
void slimfly_model_stat_collect(terminal_state *s, tw_lp *lp, char *buffer);
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static void ross_slimfly_sample_fn(terminal_state * s, tw_bf * bf, tw_lp * lp, struct slimfly_cn_sample *sample);
static void ross_slimfly_sample_rc_fn(terminal_state * s, tw_bf * bf, tw_lp * lp, struct slimfly_cn_sample *sample);
static void ross_slimfly_rsample_fn(router_state * s, tw_bf * bf, tw_lp * lp, struct slimfly_router_sample *sample);
static void ross_slimfly_rsample_rc_fn(router_state * s, tw_bf * bf, tw_lp * lp, struct slimfly_router_sample *sample);
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st_model_types slimfly_model_types[] = {
    {(rbev_trace_f) slimfly_event_collect,
     sizeof(int),
     (ev_trace_f) slimfly_event_collect,
     sizeof(int),
     (model_stat_f) slimfly_model_stat_collect,
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     0, // update this when changing slimfly_model_stat_collect
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     (sample_event_f) ross_slimfly_sample_fn,
     (sample_revent_f) ross_slimfly_sample_rc_fn,
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     sizeof(struct slimfly_cn_sample) } , 
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    {(rbev_trace_f) slimfly_event_collect,
     sizeof(int),
     (ev_trace_f) slimfly_event_collect,
     sizeof(int),
     (model_stat_f) slimfly_model_stat_collect,
     0, // update this when changing slimfly_model_stat_collect
     (sample_event_f) ross_slimfly_rsample_fn,
     (sample_revent_f) ross_slimfly_rsample_rc_fn,
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     0 } , //updated in slim_router_setup() since it's based on the radix 
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    {NULL, 0, NULL, 0, NULL, 0, NULL, NULL, 0}
};
/* End of ROSS model stats collection */

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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;
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    struct sfly_qhash_entry *tmp = NULL;
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    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)
{
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    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 - 1));
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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)
{
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    return sizeof(slim_terminal_message);
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}

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static void free_tmp(void * ptr)
{
    struct sfly_qhash_entry * sfly = ptr;
    if(sfly->remote_event_data)
        free(sfly->remote_event_data);
    if(sfly)
        free(sfly);
}
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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 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];
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    assert(tail);
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    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 slimfly_read_config(const char * anno, slimfly_param *params){
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    uint32_t h1 = 0, h2 = 0;
    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    slim_terminal_magic_num = h1 + h2;
    bj_hashlittle2(LP_METHOD_NM, strlen(LP_METHOD_NM), &h1, &h2);
    slim_router_magic_num = h1 + h2;
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    // 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);
    }

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    configuration_get_value_int(&config, "PARAMS", "num_vcs", anno, &p->num_vcs);
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    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;
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    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);
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    if (ret != 1)
        tw_error(TW_LOC, "unable to read PARAMS:generator_set_X\n");
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    if (length < 2)
        fprintf(stderr, "generator set X less than 2 elements\n");
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    X = (int*)malloc(sizeof(int)*length);
    for (size_t i = 0; i < length; i++)
    {
        X[i] = atoi(values[i]);
    }
    free(values);

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    ret = configuration_get_multivalue(&config, "PARAMS", "generator_set_X_prime", anno, &values, &length);
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    if (ret != 1)
        tw_error(TW_LOC, "unable to read PARAMS:generator_set_X_prime\n");
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    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;
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    MPI_Comm_rank(MPI_COMM_CODES, &rank);
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    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()
{
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    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;

    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);

    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);

    /* print statistics */
    if(!g_tw_mynode)
    {
        printf(" Average number of hops traversed %f average chunk latency %lf us maximum chunk latency %lf us avg message size %lf bytes finished messages %lld \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
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        throughput_avg = throughput_avg / (float)slim_total_terminals_noah;
        throughput_avg2 = throughput_avg2 / (float)slim_total_terminals_noah;

        //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");
        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);
        fclose(slimfly_results_log);
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#endif
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    }
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#if ROUTER_OCCUPANCY_LOG
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    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)
                            printf("k:%d, j:%d, i:%d, t:%d\n",k,j,i,t);
                        fprintf(slimfly_router_occupancy_log, "%d, ", vc_occupancy_storage_router[k][j][i][t]);
                    }
                }
            }
        }
    }
    fclose(slimfly_router_occupancy_log);
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#endif

#if TERMINAL_OCCUPANCY_LOG
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    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);
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#endif

#if TERMINAL_SENDS_RECVS_LOG
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    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);
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#endif

#if ROUTER_SENDS_RECVS_LOG
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    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);
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#endif

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    return;
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}

/* 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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{
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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];
    }

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    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 = codes_mapping_get_lp_relative_id(lp->gid, 0, 0);  
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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;
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    s->busy_time = 0;
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    rc_stack_create(&s->st);
    s->num_vcs = 1;
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   s->last_buf_full = (tw_stime*)malloc(s->num_vcs * sizeof(tw_stime));
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    s->vc_occupancy = (int*)malloc(s->num_vcs * sizeof(int));
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    for( i = 0; i < s->num_vcs; i++ )
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    {
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        s->last_buf_full[i] = 0.0;
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        s->vc_occupancy[i]=0;
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    }

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    s->rank_tbl = qhash_init(slimfly_rank_hash_compare, slimfly_hash_func, SLIMFLY_HASH_TABLE_SIZE);
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    if(!s->rank_tbl)
        tw_error(TW_LOC, "\n Hash table not initialized! ");
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    s->terminal_msgs =
        (slim_terminal_message_list**)malloc(1*sizeof(slim_terminal_message_list*));
    s->terminal_msgs_tail =
        (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;
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    return;
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}


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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)
{
    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;

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    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));
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    r->link_traffic = (int64_t*)malloc(p->radix * sizeof(int64_t));
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    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 =
        (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
    r->pending_msgs_tail =
        (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
    r->queued_msgs =
        (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));
    r->queued_msgs_tail =
        (slim_terminal_message_list***)malloc(p->radix * sizeof(slim_terminal_message_list**));

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   r->last_buf_full = (tw_stime**)malloc(p->radix * sizeof(tw_stime*));
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    r->busy_time = (tw_stime*)malloc(p->radix * sizeof(tw_stime));

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    // ROSS Instrumentation
    if (g_st_use_analysis_lps)
       lp->model_types->sample_struct_sz = sizeof(struct slimfly_router_sample) + sizeof(int) * p->radix;

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    rc_stack_create(&r->st);

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    for(int i=0; i < p->radix; i++)
    {
        // Set credit & router occupancy
        r->next_output_available_time[i]=0;
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        r->link_traffic[i]=0;
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        r->cur_hist_num[i] = 0;
        r->prev_hist_num[i] = 0;
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        r->busy_time[i] = 0.0;

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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->last_buf_full[i] = (tw_stime*)malloc(p->num_vcs * sizeof(tw_stime));
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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*));
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        for(int j = 0; j < p->num_vcs; j++) {
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            r->last_buf_full[i][j] = 0.0;
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            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];
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    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));

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    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++)
        {
            temp = fscanf(MMS_input_file,"%s",one_word); // got one word from the file
            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++)
    {
        temp = fscanf(MMS_input_file,"%s",one_word); // got one word from the file
        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
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    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;
    int generator_size = X_size;

    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;
        }
        // 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
    for(rid_d=r->params->slim_total_routers-1;rid_d>=0;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;
        }
        // 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;
            }
        }
    }
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#endif
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    assert(local_idx == r->params->num_local_channels);
    assert(global_idx == r->params->num_global_channels);
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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*/
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    {
        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);
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    tw_event_send(e_new);
    return xfer_to_nic_time;
}

/* slimfly packet event reverse handler */
static void slimfly_packet_event_rc(tw_lp *sender)
{
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    codes_local_latency_reverse(sender);
    return;
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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, slim_terminal_message * msg, tw_lp * lp, int sq)
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{
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    tw_event * buf_e;
    tw_stime ts;
    slim_terminal_message * buf_msg;
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    int dest = 0,  type = R_BUFFER;
    int is_terminal = 0;
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    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");
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#if TRACK_OUTPUT
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    if( msg->packet_ID == TRACK )
    {
        printf("sending credit to gid:%d\n",dest);
    }
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#endif

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    ts = g_tw_lookahead + p->credit_delay +  tw_rand_unif(lp->rng);
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    if (is_terminal) {
        buf_e = model_net_method_event_new(dest, ts, lp, SLIMFLY,
                (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;
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    tw_event_send(buf_e);
    return;
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}

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);

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

    if(!num_chunks)
        num_chunks = 1;

    int i;
    for(i = 0; i < num_chunks; i++)
    {
        slim_delete_terminal_message_list(return_tail(s->terminal_msgs,
                    s->terminal_msgs_tail, 0));
        s->terminal_length -= s->params->chunk_size;
    }
    if(bf->c5)
    {
        codes_local_latency_reverse(lp);
        s->in_send_loop = 0;
    }
    if(bf->c11)
    {
        s->issueIdle = 0;
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        if(bf->c8)
        {
            s->last_buf_full[0] = msg->saved_busy_time;
        }
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    }
    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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{
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    tw_stime ts, nic_ts;

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

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

    if(!num_chunks)
        num_chunks = 1;

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

    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;

    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++)
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    {
        slim_terminal_message_list *cur_chunk = (slim_terminal_message_list*)malloc(
                sizeof(slim_terminal_message_list));
        slim_init_terminal_message_list(cur_chunk, msg);

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

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

        cur_chunk->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;
    }

    if(s->terminal_length < 2 * s->params->cn_vc_size)
    {
        model_net_method_idle_event(nic_ts, 0, lp);
    }
    else
    {
        bf->c11 = 1;
        s->issueIdle = 1;
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        if(s->last_buf_full[0] == 0.0)
        {
            bf->c8 = 1;
            msg->saved_busy_time = s->last_buf_full[0];
            /* TODO: Assumes a single vc from terminal to router */
            s->last_buf_full[0] = tw_now(lp);
        }
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    }

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

    total_event_size = model_net_get_msg_sz(SLIMFLY) +
        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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{
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    if(bf->c1) {
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        s->in_send_loop = 1;
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        if(bf->c10)
            s->last_buf_full[0] = msg->saved_busy_time;
        
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        return;
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    }
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    tw_rand_reverse_unif(lp->rng);
    s->terminal_available_time = msg->saved_available_time;
    if(bf->c2) {
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        codes_local_latency_reverse(lp);
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    }
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    s->terminal_length += s->params->chunk_size;
    s->packet_counter--;
    s->vc_occupancy[0] -= s->params->chunk_size;
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    slim_terminal_message_list* cur_entry = rc_stack_pop(s->st);

    prepend_to_terminal_message_list(s->terminal_msgs,
            s->terminal_msgs_tail, 0, cur_entry);
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    if(bf->c3) {
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        tw_rand_reverse_unif(lp->rng);
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    }
    if(bf->c4) {
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        s->in_send_loop = 1;
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    }
    if(bf->c5)
    {
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        codes_local_latency_reverse(lp);
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        s->issueIdle = 1;
        if(bf->c6)
        {
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            s->busy_time = msg->saved_total_time;
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            s->last_buf_full[0] = msg->saved_busy_time;
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        }
    }
    return;
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}
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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,
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        tw_lp * lp)
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{
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    tw_stime ts;
    tw_event *e;
    slim_terminal_message *m;
    tw_lpid router_id;

    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)
  {
      if(s->last_buf_full[0] == 0.0)
      {
        bf->c10 = 1;
        msg->saved_busy_time = s->last_buf_full[0];
        s->last_buf_full[0] = tw_now(lp);
      }
  }
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    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;
        return;
    }
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    uint64_t num_chunks = cur_entry->msg.packet_size/s->params->chunk_size;
    if(cur_entry->msg.packet_size % s->params->chunk_size)
        num_chunks++;

    if(!num_chunks)
        num_chunks = 1;

    tw_stime delay = s->params->cn_delay;
    if((cur_entry->msg.packet_size % s->params->chunk_size) && (cur_entry->msg.chunk_id == num_chunks - 1))
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        delay = bytes_to_ns(cur_entry->msg.packet_size % s->params->chunk_size, s->params->cn_bandwidth); 
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    msg->saved_available_time = s->terminal_available_time;
    ts = g_tw_lookahead + 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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    ts = s->terminal_available_time - tw_now(lp);
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    //TODO: be annotation-aware
    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
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            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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    codes_mapping_get_lp_id(lp_group_name, "slimfly_router", NULL, 1,
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            s->router_id, 0, &router_id);
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    // we are sending an event to the router, so no method_event here
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    e = tw_event_new(router_id, ts, lp);
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    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);
    }

    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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    if(cur_entry->msg.chunk_id == num_chunks - 1 && (cur_entry->msg.local_event_size_bytes > 0))
    {
        bf->c2 = 1;
        tw_stime local_ts = codes_local_latency(lp);
        tw_event *e_new = tw_event_new(cur_entry->msg.sender_lp, local_ts, lp);
        slim_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