ceph/src/boost/libs/mpi/test/gather_test.cpp

   1 // Copyright (C) 2005, 2006 Douglas Gregor.
   2
   3 // Use, modification and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 // A test of the gather() and gatherv() collectives.
   8 #include <boost/mpi/collectives/gather.hpp>
   9 #include <boost/mpi/collectives/gatherv.hpp>
  10 #include <boost/mpi/communicator.hpp>
  11 #include <boost/mpi/environment.hpp>
  12 #include "gps_position.hpp"
  13 #include <boost/serialization/string.hpp>
  14 #include <boost/serialization/list.hpp>
  15 #include <boost/iterator/counting_iterator.hpp>
  16 #include <boost/lexical_cast.hpp>
  17
  18 #define BOOST_TEST_MODULE mpi_gather
  19 #include <boost/test/included/unit_test.hpp>
  20
  21 using boost::mpi::communicator;
  22
  23 template<typename Generator>
  24 void
  25 gather_test(const communicator& comm, Generator generator,
  26             const char* kind, int root = -1)
  27 {
  28   typedef typename Generator::result_type value_type;
  29   value_type value = generator(comm.rank());
  30
  31   if (root == -1) {
  32     for (root = 0; root < comm.size(); ++root)
  33       gather_test(comm, generator, kind, root);
  34   } else {
  35     using boost::mpi::gather;
  36
  37     std::vector<value_type> values;
  38     if (comm.rank() == root) {
  39       std::cout << "Gathering " << kind << " from root "
  40                 << root << "..." << std::endl;
  41     }
  42
  43     gather(comm, value, values, root);
  44
  45     if (comm.rank() == root) {
  46       std::vector<value_type> expected_values;
  47       for (int p = 0; p < comm.size(); ++p)
  48         expected_values.push_back(generator(p));
  49       BOOST_CHECK(values == expected_values);
  50     } else {
  51       BOOST_CHECK(values.empty());
  52     }
  53   }
  54
  55   (comm.barrier)();
  56 }
  57
  58
  59 template<typename Generator>
  60 void
  61 gatherv_test(const communicator& comm, Generator generator,
  62              const char* kind, int root = -1)
  63 {
  64   typedef typename Generator::result_type value_type;
  65
  66   if (root == -1) {
  67     for (root = 0; root < comm.size(); ++root)
  68       gatherv_test(comm, generator, kind, root);
  69   } else {
  70     using boost::mpi::gatherv;
  71
  72     int mysize = comm.rank() + 1;
  73     int nprocs = comm.size();
  74
  75     // process p will send p+1 identical generator(p) elements
  76     std::vector<value_type> myvalues(mysize, generator(comm.rank()));
  77
  78     if (comm.rank() == root) {
  79       std::vector<value_type> values((nprocs*(nprocs+1))/2);
  80       std::vector<int> sizes(comm.size());
  81       for (int p = 0; p < comm.size(); ++p)
  82         sizes[p] = p + 1;
  83
  84       std::cout << "Gatheringv " << kind << " from root "
  85                 << root << "..." << std::endl;
  86
  87       gatherv(comm, myvalues, &values[0], sizes, root);
  88
  89       std::vector<value_type> expected_values;
  90       for (int p = 0; p < comm.size(); ++p)
  91         for (int i = 0; i < p+1; ++i)
  92           expected_values.push_back(generator(p));
  93
  94       BOOST_CHECK(values == expected_values);
  95     } else {
  96       gatherv(comm, myvalues, root);
  97     }
  98   }
  99
 100   (comm.barrier)();
 101 }
 102
 103 //
 104 // Generators to test with gather/gatherv
 105 //
 106 struct int_generator
 107 {
 108   typedef int result_type;
 109
 110   int operator()(int p) const { return 17 + p; }
 111 };
 112
 113 struct gps_generator
 114 {
 115   typedef gps_position result_type;
 116
 117   gps_position operator()(int p) const
 118   {
 119     return gps_position(39 + p, 16, 20.2799);
 120   }
 121 };
 122
 123 struct string_generator
 124 {
 125   typedef std::string result_type;
 126
 127   std::string operator()(int p) const
 128   {
 129     std::string result = boost::lexical_cast<std::string>(p);
 130     result += " rosebud";
 131     if (p != 1) result += 's';
 132     return result;
 133   }
 134 };
 135
 136 struct string_list_generator
 137 {
 138   typedef std::list<std::string> result_type;
 139
 140   std::list<std::string> operator()(int p) const
 141   {
 142     std::list<std::string> result;
 143     for (int i = 0; i <= p; ++i) {
 144       std::string value = boost::lexical_cast<std::string>(i);
 145       result.push_back(value);
 146     }
 147     return result;
 148   }
 149 };
 150
 151 BOOST_AUTO_TEST_CASE(gather_check)
 152 {
 153   boost::mpi::environment env;
 154   communicator comm;
 155
 156   gather_test(comm, int_generator(), "integers");
 157   gather_test(comm, gps_generator(), "GPS positions");
 158   gather_test(comm, string_generator(), "string");
 159   gather_test(comm, string_list_generator(), "list of strings");
 160
 161   gatherv_test(comm, int_generator(), "integers");
 162   gatherv_test(comm, gps_generator(), "GPS positions");
 163   gatherv_test(comm, string_generator(), "string");
 164   gatherv_test(comm, string_list_generator(), "list of strings");
 165 }