src/smpi/colls/smpi_automatic_selector.cpp

   1 /* Copyright (c) 2013-2021. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include <cfloat>
   7 #include <exception>
   8
   9 #include "colls_private.hpp"
  10 #include "simgrid/s4u/Engine.hpp"
  11 #include "src/smpi/include/smpi_actor.hpp"
  12
  13 //attempt to do a quick autotuning version of the collective,
  14 #define AUTOMATIC_COLL_BENCH(cat, ret, args, args2)                                                                    \
  15   ret _XBT_CONCAT2(cat, __automatic)(COLL_UNPAREN args)                                                                \
  16   {                                                                                                                    \
  17     double time1, time2, time_min = DBL_MAX;                                                                           \
  18     int min_coll = -1, global_coll = -1;                                                                               \
  19     double buf_in, buf_out, max_min = DBL_MAX;                                                                         \
  20     auto descriptions = simgrid::smpi::colls::get_smpi_coll_descriptions(_XBT_STRINGIFY(cat));                         \
  21     for (unsigned long i = 0; i < descriptions->size(); i++) {                                                         \
  22       auto desc = &descriptions->at(i);                                                                                \
  23       if (desc->name == "automatic" || desc->name == "default")                                                        \
  24         continue;                                                                                                      \
  25       barrier__default(comm);                                                                                          \
  26       if (TRACE_is_enabled()) {                                                                                        \
  27         simgrid::instr::EventType* type =                                                                              \
  28             simgrid::instr::Container::get_root()->get_type()->by_name_or_create<simgrid::instr::EventType>(           \
  29                 _XBT_STRINGIFY(cat));                                                                                  \
  30                                                                                                                        \
  31         std::string cont_name = std::string("rank-" + std::to_string(simgrid::s4u::this_actor::get_pid()));            \
  32         type->add_entity_value(desc->name, "1.0 1.0 1.0");                                                             \
  33         new simgrid::instr::NewEvent(simgrid::s4u::Engine::get_clock(), simgrid::instr::Container::by_name(cont_name), \
  34                                      type, type->get_entity_value(desc->name));                                        \
  35       }                                                                                                                \
  36       time1 = simgrid::s4u::Engine::get_clock();                                                                       \
  37       try {                                                                                                            \
  38         ((int(*) args)desc->coll) args2;                                                                               \
  39       } catch (std::exception & ex) {                                                                                  \
  40         continue;                                                                                                      \
  41       }                                                                                                                \
  42       time2   = simgrid::s4u::Engine::get_clock();                                                                     \
  43       buf_out = time2 - time1;                                                                                         \
  44       reduce__default((void*)&buf_out, (void*)&buf_in, 1, MPI_DOUBLE, MPI_MAX, 0, comm);                               \
  45       if (time2 - time1 < time_min) {                                                                                  \
  46         min_coll = i;                                                                                                  \
  47         time_min = time2 - time1;                                                                                      \
  48       }                                                                                                                \
  49       if (comm->rank() == 0) {                                                                                         \
  50         if (buf_in < max_min) {                                                                                        \
  51           max_min     = buf_in;                                                                                        \
  52           global_coll = i;                                                                                             \
  53         }                                                                                                              \
  54       }                                                                                                                \
  55     }                                                                                                                  \
  56     if (comm->rank() == 0) {                                                                                           \
  57       XBT_WARN("For rank 0, the quickest was %s : %f , but global was %s : %f at max",                                 \
  58                descriptions->at(min_coll).name.c_str(), time_min, descriptions->at(global_coll).name.c_str(),          \
  59                max_min);                                                                                               \
  60     } else                                                                                                             \
  61       XBT_WARN("The quickest " _XBT_STRINGIFY(cat) " was %s on rank %d and took %f",                                   \
  62                descriptions->at(min_coll).name.c_str(), comm->rank(), time_min);                                       \
  63     return (min_coll != -1) ? MPI_SUCCESS : MPI_ERR_INTERN;                                                            \
  64   }
  65
  66 namespace simgrid{
  67 namespace smpi{
  68
  69 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_ALLGATHERV_SIG, (send_buff, send_count, send_type, recv_buff, recv_count, recv_disps, recv_type, comm))
  70 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_ALLREDUCE_SIG, (sbuf, rbuf, rcount, dtype, op, comm))
  71 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_GATHER_SIG, (send_buff, send_count, send_type, recv_buff, recv_count, recv_type, root, comm))
  72 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_ALLGATHER_SIG, (send_buff,send_count,send_type,recv_buff,recv_count,recv_type,comm))
  73 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_ALLTOALL_SIG,(send_buff, send_count, send_type, recv_buff, recv_count, recv_type,comm))
  74 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_ALLTOALLV_SIG, (send_buff, send_counts, send_disps, send_type, recv_buff, recv_counts, recv_disps, recv_type, comm))
  75 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_BCAST_SIG , (buf, count, datatype, root, comm))
  76 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_REDUCE_SIG,(buf,rbuf, count, datatype, op, root, comm))
  77 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_REDUCE_SCATTER_SIG ,(sbuf,rbuf, rcounts,dtype,op,comm))
  78 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_SCATTER_SIG ,(sendbuf, sendcount, sendtype,recvbuf, recvcount, recvtype,root, comm))
  79 COLL_APPLY(AUTOMATIC_COLL_BENCH, COLL_BARRIER_SIG,(comm))
  80
  81 }
  82 }