text: /*****************************************************************************
   *                                                                           *
   * Copyright (c) 2003-2011 Intel Corporation.                                *
   * All rights reserved.                                                      *
   *                                                                           *
   *****************************************************************************
  
  This code is covered by the Community Source License (CPL), version
  1.0 as published by IBM and reproduced in the file "license.txt" in the
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  or without modification, is permitted ONLY within the regulations
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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_scatterv.c 
  
   Implemented functions: 
  
   IMB_scatterv;
  
   ***************************************************************************/
  
  
  
  
  
  #include "IMB_declare.h"
  #include "IMB_benchmark.h"
  
  #include "IMB_prototypes.h"
  
  /*******************************************************************************/
  
  /* ===================================================================== */
  /* 
  IMB_scatterv is a new IMB 3.1 benchmark
  July 2007
  Hans-Joachim Plum, Intel GmbH
  
  */
  /* ===================================================================== */
  
  
  void IMB_scatterv(struct comm_info* c_info, int size, struct iter_schedule* ITERATIONS,
                   MODES RUN_MODE, double* time)
  /*
  
                        
                        MPI-1 benchmark kernel
                        Benchmarks MPI_Scatterv
                        
  
  
  Input variables: 
  
  -c_info               (type struct comm_info*)                      
                        Collection of all base data for MPI;
                        see [1] for more information
                        
  
  -size                 (type int)                      
                        Basic message size in bytes
  
  -ITERATIONS           (type struct iter_schedule *)
                        Repetition scheduling
  
  -RUN_MODE             (type MODES)                      
                        (only MPI-2 case: see [1])
  
  
  Output variables: 
  
  -time                 (type double*)                      
                        Timing result per sample
  
  
  */
  {
    double t1, t2;
    int    i;
    Type_Size s_size,r_size;
    int s_num, r_num;
  
  #ifdef CHECK
  defect=0.;
  #endif
    ierr = 0;
  
    /*  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;
      } 
  
    /* INITIALIZATION OF DISPLACEMENT and RECEIVE COUNTS */
  
    for (i=0;i<c_info->num_procs ;i++)
      {
        c_info->sdispl[i] = s_num*i;
        c_info->sndcnt[i] = s_num;
      }
  
    
    if(c_info->rank!=-1)
      {
        for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);
  
        t1 = MPI_Wtime();
        for(i=0;i<ITERATIONS->n_sample;i++)
        {
            ierr = MPI_Scatterv((char*)c_info->s_buffer+i%ITERATIONS->s_cache_iter*ITERATIONS->s_offs,
                                c_info->sndcnt,c_info->sdispl, c_info->s_data_type,
  		              (char*)c_info->r_buffer+i%ITERATIONS->r_cache_iter*ITERATIONS->r_offs,
  // root = round robin
                                r_num, c_info->r_data_type, i%c_info->num_procs,
                                c_info->communicator);
            MPI_ERRHAND(ierr);
            CHK_DIFF("Scatterv",c_info, 
                     (char*)c_info->r_buffer+i%ITERATIONS->r_cache_iter*ITERATIONS->r_offs,
                     c_info->sdispl[c_info->rank], size, size, 1, 
                     put, 0, ITERATIONS->n_sample, i,
                     i%c_info->num_procs, &defect);
          }
        t2 = MPI_Wtime();
        *time=(t2 - t1)/ITERATIONS->n_sample;
      }
    else
      { 
        *time = 0.; 
      }
  }
  