MPIService Class Reference

Public Member Functions
	MPIService (edm::ParameterSet const &config)
	~MPIService ()

Static Public Member Functions
static void	fillDescriptions (edm::ConfigurationDescriptions &descriptions)

Detailed Description

Definition at line 20 of file MPIService.cc.

Constructor & Destructor Documentation

MPIService::MPIService

(

edm::ParameterSet const &

config

)

Definition at line 28 of file MPIService.cc.

References Exception, and log.

                                                    {
  // initializes the MPI execution environment, requesting multi-threading support
  int provided;
  MPI_Init_thread(nullptr, nullptr, MPI_THREAD_MULTIPLE, &provided);
  if (provided < MPI_THREAD_MULTIPLE) {
    throw cms::Exception("UnsupportedFeature")
        << "CMSSW requires the " << mpi_thread_support_level[MPI_THREAD_MULTIPLE]
        << " multithreading support level, but the MPI library provides only the " << mpi_thread_support_level[provided]
        << " level.";
  } else {
    edm::LogInfo log("MPIService");

    // get the number of processes
    int world_size;
    MPI_Comm_size(MPI_COMM_WORLD, &world_size);
    log << "MPI_COMM_WORLD size: " << world_size << '\n';

    // get the rank of the process
    int world_rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
    log << "MPI_COMM_WORLD rank: " << world_rank << '\n';

    // get the name of the processor
    char processor_name[MPI_MAX_PROCESSOR_NAME];
    int name_len;
    MPI_Get_processor_name(processor_name, &name_len);
    log << "MPI processor name:  " << processor_name << '\n';

    log << "The MPI library provides the " << mpi_thread_support_level[provided] << " multithreading support level\n";
    log << "MPI successfully initialised";
  }
}

MPIService::~MPIService

(

)

Definition at line 61 of file MPIService.cc.

                        {
  // terminate the MPI execution environment
  MPI_Finalize();
}

Member Function Documentation

void MPIService::fillDescriptions ( edm::ConfigurationDescriptions &  descriptions )

static

Definition at line 66 of file MPIService.cc.

References edm::ConfigurationDescriptions::add(), submitPVResolutionJobs::desc, and edm::ConfigurationDescriptions::setComment().

                                                                            {
  edm::ParameterSetDescription desc;
  descriptions.add("MPIService", desc);
  descriptions.setComment(R"(This Service provides a common interface to MPI configuration for the CMSSW job.)");
}