#define BENCHMARK "OSU OpenSHMEM Reduce Latency Test"
/*
 * Copyright (C) 2002-2021 the Network-Based Computing Laboratory
 * (NBCL), The Ohio State University.
 *
 * Contact: Dr. D. K. Panda (panda@cse.ohio-state.edu)
 */

/*
This program is available under BSD licensing.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

(3) Neither the name of The Ohio State University nor the names of
their contributors may be used to endorse or promote products derived
from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <shmem.h>
#include <osu_util_pgas.h>

long pSyncRed1[_SHMEM_REDUCE_SYNC_SIZE];
long pSyncRed2[_SHMEM_REDUCE_SYNC_SIZE];

double pWrk1[_SHMEM_REDUCE_MIN_WRKDATA_SIZE];
double pWrk2[_SHMEM_REDUCE_MIN_WRKDATA_SIZE];

int main(int argc, char *argv[])
{
    int i, numprocs, rank, size = 0, iterations;
    unsigned long align_size = sysconf(_SC_PAGESIZE);
    int skip;
    static double latency = 0.0;
    double t_start = 0, t_stop = 0, timer=0;
    static double avg_time = 0.0, max_time = 0.0, min_time = 0.0;
    float *sendbuf, *recvbuf;
    int max_msg_size = 1048576, full = 0, t;
    int po_ret;

    options.bench = OSHM;

    for ( t = 0; t < _SHMEM_REDUCE_SYNC_SIZE; t += 1) pSyncRed1[t] = _SHMEM_SYNC_VALUE;
    for ( t = 0; t < _SHMEM_REDUCE_SYNC_SIZE; t += 1) pSyncRed2[t] = _SHMEM_SYNC_VALUE;

#ifdef OSHM_1_3 
    shmem_init();
    rank = shmem_my_pe();
    numprocs = shmem_n_pes();
#else
	start_pes(0);
    rank = _my_pe();
    numprocs = _num_pes();
#endif

    po_ret = process_options(argc, argv);

    switch (po_ret) {
        case PO_BAD_USAGE:
            print_usage_pgas(rank, argv[0], size != 0);
            exit(EXIT_FAILURE);
        case PO_HELP_MESSAGE:
            print_usage_pgas(rank, argv[0], size != 0);
            exit(EXIT_SUCCESS);
        case PO_VERSION_MESSAGE:
            if (rank == 0) {
                print_version_pgas(HEADER);
            }
            exit(EXIT_SUCCESS);
        case PO_OKAY:
            break;
    }

    if(numprocs < 2) {
        if(rank == 0) {
            fprintf(stderr, "This test requires at least two processes\n");
        }
        return EXIT_FAILURE;
    }

    int nreduce = max_msg_size/sizeof(float);

#ifdef OSHM_1_3 
    float *pWrkF1 = (float *)shmem_malloc(sizeof (float) * MAX(nreduce/2+1, _SHMEM_REDUCE_MIN_WRKDATA_SIZE));
    float *pWrkF2 = (float *)shmem_malloc(sizeof (float) * MAX(nreduce/2+1, _SHMEM_REDUCE_MIN_WRKDATA_SIZE));
#else
	float *pWrkF1 = (float *)shmalloc(sizeof (float) * MAX(nreduce/2+1, _SHMEM_REDUCE_MIN_WRKDATA_SIZE));
    float *pWrkF2 = (float *)shmalloc(sizeof (float) * MAX(nreduce/2+1, _SHMEM_REDUCE_MIN_WRKDATA_SIZE));
#endif
    
    max_msg_size = options.max_message_size;
    full = options.show_full;
    print_header_pgas(HEADER, rank, full);

#ifdef OSHM_1_3    
	recvbuf = (float *)shmem_align(align_size, max_msg_size);
#else
	recvbuf = (float *)shmemalign(align_size, max_msg_size);
#endif
    
	if (NULL == recvbuf) {
        fprintf(stderr, "shmemalign failed.\n");
        exit(1);
    }
#ifdef OSHM_1_3     
	sendbuf = (float *)shmem_align(align_size, max_msg_size);
#else
	sendbuf = (float *)shmemalign(align_size, max_msg_size);
#endif
    
	if (NULL == sendbuf) {
        fprintf(stderr, "shmemalign failed.\n");
        exit(1);
    }

    memset(sendbuf, 1, max_msg_size);
    memset(recvbuf, 0, max_msg_size);

    for(size=1; size*sizeof(float)<= max_msg_size; size *= 2) {

        if(size > LARGE_MESSAGE_SIZE) {
            skip = options.skip_large;
            iterations = options.iterations_large;
        } else {
            skip = options.skip;
            iterations = options.iterations;
        }

        shmem_barrier_all();
        
        timer=0;
        for(i=0; i < iterations + skip ; i++) {
            t_start = TIME();

            if(i%2)
                shmem_float_sum_to_all(recvbuf, sendbuf, size, 0, 0, numprocs, pWrkF1, pSyncRed1);
            else
                shmem_float_sum_to_all(recvbuf, sendbuf, size, 0, 0, numprocs, pWrkF2, pSyncRed2);

            t_stop=TIME();

            if(i>=skip){
                timer+=t_stop-t_start;
            }
            shmem_barrier_all();
        }

        latency = (double)(timer * 1.0) / iterations;
        shmem_double_min_to_all(&min_time, &latency, 1, 0, 0, numprocs, pWrk1, pSyncRed1);
        shmem_double_max_to_all(&max_time, &latency, 1, 0, 0, numprocs, pWrk2, pSyncRed2);
        shmem_double_sum_to_all(&avg_time, &latency, 1, 0, 0, numprocs, pWrk1, pSyncRed1);
        avg_time = avg_time/numprocs;

        print_data_pgas(rank, full, sizeof(float)*size, avg_time, min_time, max_time, iterations);
        shmem_barrier_all();
    }
                           
    shmem_barrier_all();
#ifdef OSHM_1_3                           
    shmem_free(pWrkF1);
    shmem_free(pWrkF2);
    shmem_free(recvbuf);
    shmem_free(sendbuf);
	
	shmem_finalize (); 
#else    
    shfree(pWrkF1);
    shfree(pWrkF2);
    shfree(recvbuf);
    shfree(sendbuf);
#endif

    return EXIT_SUCCESS;
}

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