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Open MPI does not support output redirection

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Open MPI does not support output redirection for spawned child
processes.
This commit is contained in:
Håkon Hægland
2024-06-28 12:49:25 +02:00
parent bf5962061a
commit ba7c1d589b
1 changed files with 4 additions and 8 deletions
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12
opm/simulators/flow/ReservoirCouplingMaster.cpp
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@@ -66,24 +66,20 @@ void ReservoirCouplingMaster::spawnSlaveProcesses([[maybe_unused]]int argc, char
slave_argv[1] = nullptr;
auto num_procs = slave.numprocs();
std::vector<int> errcodes(num_procs);
MPI_Info info;
MPI_Info_create(&info);
const std::string log_file = fmt::format("{}.log", slave_name);
// TODO: We need to decide how to handle the output from the slave processes
// For now we just redirect the output to a log file with the name of the slave
MPI_Info_set(info, "output", log_file.c_str());
MPI_Info_set(info, "error", log_file.c_str());
// TODO: We need to decide how to handle the output from the slave processes..
// As far as I can tell, open MPI does not support redirecting the output
// to a file, so we might need to implement a custom solution for this
int spawn_result = MPI_Comm_spawn(
flow_program_name,
slave_argv.data(),
/*maxprocs=*/num_procs,
/*info=*/info,
/*info=*/MPI_INFO_NULL,
/*root=*/0, // Rank 0 spawns the slave processes
/*comm=*/this->comm_,
/*intercomm=*/master_slave_comm.get(),
/*array_of_errcodes=*/errcodes.data()
);
MPI_Info_free(&info);
if (spawn_result != MPI_SUCCESS || (*master_slave_comm == MPI_COMM_NULL)) {
OPM_THROW(std::runtime_error, "Failed to spawn slave process");
}