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#include "mpibig.h"
#include <aocommon/logger.h>
#include <algorithm>
#include <cstdint>
using aocommon::Logger;
namespace wsclean {
int MPI_Send_Big(unsigned char* buf, size_t count, int dest, int tag,
MPI_Comm comm, size_t maximum_message_size) {
size_t n_packages = (count + maximum_message_size - 1) / maximum_message_size;
*reinterpret_cast<uint64_t*>(buf) = n_packages;
Logger::Debug << "Sending " << n_packages << " packages...\n";
for (size_t i = 0; i != n_packages - 1; ++i) {
const unsigned char* part_buffer = buf + i * maximum_message_size;
int return_value =
MPI_Send(part_buffer, maximum_message_size, MPI_BYTE, dest, tag, comm);
if (return_value != MPI_SUCCESS) return return_value;
Logger::Debug << "Package " << (i + 1) << " sent.\n";
}
const unsigned char* part_buffer =
buf + (n_packages - 1) * maximum_message_size;
size_t part_count = count % maximum_message_size;
int return_value =
MPI_Send(part_buffer, part_count, MPI_BYTE, dest, tag, comm);
Logger::Debug << "Package " << n_packages << " sent.\n";
return return_value;
}
int MPI_Recv_Big(unsigned char* buf, size_t count, int source, int tag,
MPI_Comm comm, MPI_Status* status,
size_t maximum_message_size) {
int first_size = std::min(maximum_message_size, count);
int return_value =
MPI_Recv(buf, first_size, MPI_BYTE, source, tag, comm, status);
if (return_value != MPI_SUCCESS) return return_value;
size_t n_packages = *reinterpret_cast<uint64_t*>(buf);
buf += first_size;
count -= size_t(first_size);
Logger::Debug << "Received package 1/" << n_packages << ".\n";
for (size_t i = 1; i != n_packages; ++i) {
int part_size = std::min(maximum_message_size, count);
return_value =
MPI_Recv(buf, part_size, MPI_BYTE, source, tag, comm, status);
if (return_value != MPI_SUCCESS) return return_value;
buf += part_size;
count -= size_t(part_size);
Logger::Debug << "Received package " << (i + 1) << "/" << n_packages
<< ".\n";
}
return MPI_SUCCESS;
}
} // namespace wsclean
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