/*****************************************************************************
 *                                                                           *
 * Copyright (c) 2003-2015 Intel Corporation.                                *
 * All rights reserved.                                                      *
 *                                                                           *
 *****************************************************************************

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 ***************************************************************************

For more documentation than found here, see

[1] doc/ReadMe_IMB.txt 

[2] Intel (R) MPI Benchmarks
    Users Guide and Methodology Description
    In 
    doc/IMB_Users_Guide.pdf
    
 File: IMB_rma_put.c 

 Implemented functions: 

 IMB_rma_single_put;
 IMB_rma_put_all;
 IMB_rma_put_local;
 IMB_rma_put_all_local;
 IMB_rma_exchange_put;
 IMB_rma_passive_put;
 
 ***************************************************************************/

#include "IMB_declare.h"
#include "IMB_benchmark.h"
#include "IMB_prototypes.h"


/* Unidirectional and bidirectional put: communication is done 
 * between two processes only. */ 
void IMB_rma_single_put (struct comm_info* c_info, int size, 
                         struct iter_schedule* iterations, 
                         MODES run_mode, double* time)
{
    double res_time = -1.;
    int target = -1;
    int sender = 0;
    Type_Size s_size;
    int s_num;
    int i;
#ifdef CHECK 
    char *recv = (char *)c_info->r_buffer;
    defect = 0;
#endif
    ierr = 0;

    if (c_info->rank == c_info->pair0)
    {
        target = c_info->pair1;
        sender = 1;
    } 
    else if (c_info->rank == c_info->pair1)
    {
        target = c_info->pair0;
        if (run_mode->BIDIR) 
        {
            /* pair1 acts as origin in bidirectional mode only */
            sender = 1;
        }    
    }    
    else if (c_info->rank < 0)
    {
        *time = res_time;
        return;
    } 
    
    MPI_Type_size(c_info->s_data_type,&s_size);
    s_num=size/s_size;

    for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);
    
    if (sender)
    {    
        MPI_Win_lock(MPI_LOCK_SHARED, target, 0, c_info->WIN);
        if (run_mode->AGGREGATE)
        {
            res_time = MPI_Wtime();
            for (i = 0; i < iterations->n_sample; i++)
            {
                ierr = MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
                               s_num, c_info->s_data_type, target, 
                               i%iterations->r_cache_iter*iterations->r_offs,
                               s_num, c_info->r_data_type, c_info->WIN);
                MPI_ERRHAND(ierr);
            }
            ierr = MPI_Win_flush(target, c_info->WIN);
            MPI_ERRHAND(ierr);
            res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
        }    
        else if ( !run_mode->AGGREGATE )    
        {
            res_time = MPI_Wtime();
            for (i = 0; i < iterations->n_sample; i++)
            {

                ierr = MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
                               s_num, c_info->s_data_type, target, 
                               i%iterations->r_cache_iter*iterations->r_offs,
                               s_num, c_info->r_data_type, c_info->WIN);
                MPI_ERRHAND(ierr);
                ierr = MPI_Win_flush(target, c_info->WIN);
                MPI_ERRHAND(ierr);
            }
            res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
        }

        MPI_Win_unlock(target, c_info->WIN);
    }     
   
    /* Synchronize target and origin processes */
    MPI_Barrier(c_info->communicator);

#ifdef CHECK
    if ( !sender || run_mode->BIDIR )
    {
         for(i = 0; i < ITER_MIN(iterations); i++)
         {
             CHK_DIFF("MPI_Put",c_info, (void*)(recv+i%iterations->r_cache_iter*iterations->r_offs), 
                      0, size, size, asize, put, 0, iterations->n_sample, i, target , &defect);
             
         }
    }     
#endif     
    
    *time = res_time; 
    return;
}

/* Implements "One_put_all" and "all_put_all" benchmarks:
 * run_mode Collective corresponds to "All_put_all",
 * run_mode MultPassiveTransfer corresponds to "One_put_all"
 * */
void IMB_rma_put_all (struct comm_info* c_info, int size, 
                      struct iter_schedule* iterations, 
                      MODES run_mode, double* time)
{
    double res_time = -1.;
    int target = 0;
    int peer = 0;
    int sender = 0;
    Type_Size s_size;
    int s_num;
    int i;
    ierr = 0;

    if (c_info->rank < 0)
    {
        *time = res_time;
        return;
    } 
    
    if (c_info->rank == 0 || run_mode->type == Collective)
    {
        sender = 1;
    }    

    MPI_Type_size(c_info->s_data_type,&s_size);
    s_num=size/s_size;

    for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);
    
    if (sender)
    {    
        MPI_Win_lock_all(0, c_info->WIN);
        
        res_time = MPI_Wtime();
        for (i = 0; i < iterations->n_sample; i++)
        {
            for (peer = 0; peer < c_info->num_procs; peer++)
            {
                
                /* choose different target for each process to avoid congestion */
                target = (peer + c_info->rank)%c_info->num_procs;
                if (target == c_info->rank)
                {
                    continue; /* do not put to itself*/
                }    
                ierr = MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
                               s_num, c_info->s_data_type, target, 
                               i%iterations->r_cache_iter*iterations->r_offs,
                               s_num, c_info->r_data_type, c_info->WIN);
                MPI_ERRHAND(ierr);
            }
        }    
        ierr = MPI_Win_flush_all(c_info->WIN);
        MPI_ERRHAND(ierr);
        res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
    
        MPI_Win_unlock_all(c_info->WIN);
    }     
   
    /* Synchronize origin and target processes */
    MPI_Barrier(c_info->communicator);

    
    *time = res_time; 
    return;
}


/* Implements "Put_local" benchmark. One process puts some data
 * to the other and make sure of completion by MPI_Win_flush_local call 
 * */
void IMB_rma_put_local (struct comm_info* c_info, int size, 
                        struct iter_schedule* iterations, 
                        MODES run_mode, double* time)
{
    double res_time = -1.;
    Type_Size s_size;
    int s_num;
    int i;
    ierr = 0;

    if (c_info->rank < 0)
    {
        *time = res_time;
        return;
    } 
    
    MPI_Type_size(c_info->s_data_type,&s_size);
    s_num=size/s_size;

    for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);
    
    if (c_info->rank == c_info->pair0)
    {    
        MPI_Win_lock(MPI_LOCK_SHARED, c_info->pair1, 0, c_info->WIN);
        if (run_mode->AGGREGATE)
        {
            res_time = MPI_Wtime();
            for (i = 0; i < iterations->n_sample; i++)
            {
                ierr = MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
                               s_num, c_info->s_data_type, c_info->pair1, 
                               i%iterations->r_cache_iter*iterations->r_offs,
                               s_num, c_info->r_data_type, c_info->WIN);
                MPI_ERRHAND(ierr);
            }
            ierr = MPI_Win_flush_local(c_info->pair1, c_info->WIN);
            MPI_ERRHAND(ierr);
            res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
        }    
        else if ( !run_mode->AGGREGATE )    
        {
            res_time = MPI_Wtime();
            for (i = 0; i < iterations->n_sample; i++)
            {

                ierr = MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
                               s_num, c_info->s_data_type, c_info->pair1, 
                               i%iterations->r_cache_iter*iterations->r_offs,
                               s_num, c_info->r_data_type, c_info->WIN);
                MPI_ERRHAND(ierr);
                ierr = MPI_Win_flush_local(c_info->pair1, c_info->WIN);
                MPI_ERRHAND(ierr);
            }
            res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
        }

        MPI_Win_unlock(c_info->pair1, c_info->WIN);
    }     
   
    /* Synchronize target and origin processes */
    MPI_Barrier(c_info->communicator);
    
    *time = res_time; 
    return;
}

/* Implements "put_all_local" benchmark. One process puts some data
 * to all other processes and make sure of completion by 
 * MPI_Win_flush_local_all call 
 * */
void IMB_rma_put_all_local (struct comm_info* c_info, int size, 
                            struct iter_schedule* iterations, 
                            MODES run_mode, double* time)
{
    double res_time = -1.;
    int target = 0;
    int peer = 0;
    Type_Size s_size;
    int s_num;
    int i;
    ierr = 0;

    if (c_info->rank < 0)
    {
        *time = res_time;
        return;
    } 

    MPI_Type_size(c_info->s_data_type,&s_size);
    s_num=size/s_size;

    for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);
    
    if (c_info->rank == 0)
    {    
        MPI_Win_lock_all(0, c_info->WIN);
        
        res_time = MPI_Wtime();
        for (i = 0; i < iterations->n_sample; i++)
        {
            for (peer = 0; peer < c_info->num_procs; peer++)
            {
                /* choose different target for each process to avoid congestion */
                target = (peer + c_info->rank)%c_info->num_procs;
                if (target == c_info->rank)
                {
                    continue; /* do not put to itself*/
                }    
                
                ierr = MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
                               s_num, c_info->s_data_type, target, 
                               i%iterations->r_cache_iter*iterations->r_offs,
                               s_num, c_info->r_data_type, c_info->WIN);
                MPI_ERRHAND(ierr);
            }
        }    
        ierr = MPI_Win_flush_local_all(c_info->WIN);
        MPI_ERRHAND(ierr);
        res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
    
        MPI_Win_unlock_all(c_info->WIN);
    }     
   
    /* Synchronize origin and target processes */
    MPI_Barrier(c_info->communicator);

    
    *time = res_time; 
    return;
}

/* Implements "Exchange_put" benchmark. Each process puts some data
 * to two neighbor processes
 * */
void IMB_rma_exchange_put (struct comm_info* c_info, int size, 
                           struct iter_schedule* iterations, 
                           MODES run_mode, double* time)
{
    double res_time = -1.;
    int left  = -1;
    int right = -1;
    Type_Size s_size;
    int s_num;
    int i;
#ifdef CHECK 
    char *recv = (char *)c_info->r_buffer;
    defect = 0;
#endif
    ierr = 0;
    
    if (c_info->rank < 0)
    {
        *time = res_time;
        return;
    } 
    
    MPI_Type_size(c_info->s_data_type,&s_size);
    s_num=size/s_size;
   
    left  = (c_info->rank == 0) ? c_info->num_procs - 1 : c_info->rank - 1;
    right = (c_info->rank + 1)%c_info->num_procs;     

    for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);
    
    if (left != right)
    {    
        MPI_Win_lock(MPI_LOCK_SHARED, left,  0, c_info->WIN);
        MPI_Win_lock(MPI_LOCK_SHARED, right, 0, c_info->WIN);
    }
    else
    {
        /* Just two processes in the chain. Both messages will come
         * to the one peer */
        MPI_Win_lock(MPI_LOCK_SHARED, left,  0, c_info->WIN);
    }    

    res_time = MPI_Wtime();
    for (i = 0; i < iterations->n_sample; i++)
    {
        ierr = MPI_Put((char*)c_info->s_buffer + i%iterations->s_cache_iter*iterations->s_offs,
                        s_num, c_info->s_data_type, left, 
                        i%iterations->r_cache_iter*iterations->r_offs,
                        s_num, c_info->r_data_type, c_info->WIN);
        MPI_ERRHAND(ierr);
        
        ierr = MPI_Put((char*)c_info->s_buffer + size + i%iterations->s_cache_iter*iterations->s_offs,
                        s_num, c_info->s_data_type, right, 
                        i%iterations->r_cache_iter*iterations->r_offs + size,
                        s_num, c_info->r_data_type, c_info->WIN);
        MPI_ERRHAND(ierr);
       
        if (left != right)
        {    
            ierr = MPI_Win_flush(left, c_info->WIN);
            MPI_ERRHAND(ierr);
        
            ierr = MPI_Win_flush(right, c_info->WIN);
            MPI_ERRHAND(ierr);
        }
        else
        {
            ierr = MPI_Win_flush(left, c_info->WIN);
            MPI_ERRHAND(ierr);
        }    
    }
    res_time = (MPI_Wtime() - res_time)/iterations->n_sample;
    if (left != right)
    {    
        MPI_Win_unlock(left, c_info->WIN);
        MPI_Win_unlock(right, c_info->WIN);
    }
    else
    {
        MPI_Win_unlock(left, c_info->WIN);
    }    
      
    /* Synchronize target and origin processes */
    MPI_Barrier(c_info->communicator);

#ifdef CHECK
    for(i = 0; i < ITER_MIN(iterations); i++)
    {
        CHK_DIFF("MPI_Put",c_info, (void*)(recv+size+i%iterations->r_cache_iter*iterations->r_offs), 
                  size, size, size, asize, put, 0, iterations->n_sample, i, left , &defect);
        
        CHK_DIFF("MPI_Put",c_info, (void*)(recv+i%iterations->r_cache_iter*iterations->r_offs), 
                  0, size, size, asize, put, 0, iterations->n_sample, i, right , &defect);
    }
#endif     

    *time = res_time; 
    return;
}


static double IMB_put_target(struct iter_schedule* iterations, struct comm_info* c_info, 
        double time_to_compute)
{
    double time = 0.;
    int i;
    time = MPI_Wtime();
    for(i=0; i < iterations->n_sample; i++)
    {
        if (time_to_compute)
        {
            IMB_cpu_exploit(time_to_compute, 0);
        }    
        MPI_Barrier(c_info->communicator);
    }
    time = (MPI_Wtime() - time)/iterations->n_sample;
    return time;
}    

static double IMB_put_origin(int msg_size, int dst, struct comm_info* c_info,
                      struct iter_schedule* iterations)
{
    double time = 0.;
    int i;
    time = MPI_Wtime();
    for(i=0; i < iterations->n_sample; i++)
    {
       MPI_Put((char*)c_info->s_buffer+i%iterations->s_cache_iter*iterations->s_offs,
               msg_size, c_info->s_data_type, dst, i%iterations->r_cache_iter*iterations->r_offs,
               msg_size, c_info->r_data_type, c_info->WIN);
       MPI_Win_flush(dst, c_info->WIN);
       MPI_Barrier(c_info->communicator);
    }    
    time = (MPI_Wtime() - time)/iterations->n_sample;
    return time;
}    

/* Implements "Truly_passive_put" benchmark. It allows to check whether 
 * MPI implementation supports truly one sided mode. 
 * The flow is:
 * 1) Execution time of MPI_Put() is measured for the case when the target is 
 *    waiting in MPI_Barrier() call.
 * 2) This time is sent to the target
 * 3) Execution time of MPI_Put is measured for the case when the target performs
 *    some computation for about the time measued at step 1) and then enters 
 *    MPI_Barrier() call */
void IMB_rma_passive_put (struct comm_info* c_info, int size, 
                           struct iter_schedule* iterations, 
                           MODES run_mode, double* time)
{
    
    double t_pure = 0.; 
    double t_with_comp = 0.;

    Type_Size s_size,r_size;
    int s_num, r_num;

    time[0] = 0.;
    time[1] = 0.;
    if (c_info->rank < 0)
    {
        return;
    }    
    
    /*  GET SIZE OF DATA TYPE */  
    MPI_Type_size(c_info->s_data_type,&s_size);
    MPI_Type_size(c_info->r_data_type,&r_size);
    if ((s_size!=0) && (r_size!=0))
    {
        s_num=size/s_size;
        r_num=size/r_size;
    }
    else
    {
        return;
    }

    MPI_Barrier(c_info->communicator);
    
    if (c_info->rank == c_info->pair0)
    {
        MPI_Win_lock(MPI_LOCK_SHARED, c_info->pair1, 0 , c_info->WIN);
        t_pure = IMB_put_origin(s_num, c_info->pair1, c_info, iterations);
        MPI_Send(&t_pure, 1, MPI_DOUBLE, c_info->pair1, 1 ,c_info->communicator);

        MPI_Barrier(c_info->communicator);

        t_with_comp = IMB_put_origin(s_num, c_info->pair1,c_info, iterations);
        time[0] = t_pure;
        time[1] = t_with_comp;


        MPI_Win_unlock(c_info->pair1, c_info->WIN);
    }    
    else if (c_info->rank == c_info->pair1)
    {
        IMB_put_target(iterations, c_info, 0.);
        MPI_Recv(&t_pure, 1, MPI_DOUBLE, c_info->pair0, 1 ,c_info->communicator,
                MPI_STATUS_IGNORE);
        
        /*initialize IMB_cpu_exploit with received time*/
        IMB_cpu_exploit(t_pure, 1);

        MPI_Barrier(c_info->communicator);

        IMB_put_target(iterations, c_info, t_pure);
    }
    return;    
}    
    
