idefix/src/main.cpp at master · idefix-code/idefix · GitHub

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// ***********************************************************************************

// Idefix MHD astrophysical code

// Source file src/main.cpp

// Last modified : 04/2026

// Copyright(C) by :

// - Geoffroy Lesur <geoffroy.lesur@univ-grenoble-alpes.fr> (IPAG/UGA/CNRS - 2020 - 2026)

// - Soufiane Baghdadi <soufiane.baghdadi@univ-grenoble-alpes.fr> (IPAG/UGA/CNRS - 2020)

// - Clément Robert <clement.robert@univ-grenoble-alpes.fr> (IPAG/UGA/CNRS - 2021 - 2024)

// - Gaylor Wafflard <gaylor.wafflard@univ-grenoble-alpes.fr> (IPAG/UGA/CNRS - 2024)

// and other code contributors

// Licensed under CeCILL 2.1 License, see COPYING for more information

// ***********************************************************************************

//@HEADER

// ************************************************************************

// IDEFIX v 2.4.0

// ************************************************************************

//@HEADER

#include <unistd.h>

#include <sys/time.h>

#include <stdlib.h>

#include <limits>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <string>

#include <Kokkos_Core.hpp>

#include "idefix.hpp"

#include "profiler.hpp"

#include "input.hpp"

#include "units.hpp"

#include "grid.hpp"

#include "gridHost.hpp"

#include "fluid.hpp"

#include "dataBlock.hpp"

#include "timeIntegrator.hpp"

#include "setup.hpp"

#include "output.hpp"

#ifdef WITH_MPI

#include "mpi.hpp"

#endif

int main( int argc, char* argv[] ) {

bool initKokkosBeforeMPI = false;

// return code is zero if the simulation reached final time

// >0 if a fatal error occured (too small timestep, Nans)

// <0 if simulation was interrupted (max_runtime or user-triggered interruption

int returnCode = 0;

// When running on GPUS with Omnipath network,

// Kokkos needs to be initialised *before* the MPI layer

#ifdef KOKKOS_ENABLE_CUDA

if(std::getenv("PSM2_CUDA") != NULL) {

initKokkosBeforeMPI = true;

}

#endif

if(initKokkosBeforeMPI) Kokkos::initialize( argc, argv );

#ifdef WITH_MPI

MPI_Init(&argc,&argv);

#endif

if(!initKokkosBeforeMPI) Kokkos::initialize( argc, argv );

{

idfx::initialize();

///////////////////////////////

// Initialization

///////////////////////////////

Input input(argc, argv);

input.PrintLogo();

idfx::cout << "Main: initialization stage." << std::endl;

// Init the units when needed

idfx::units.Init(input);

// Allocate the grid on device

Grid grid(input);

// Allocate the grid image on host

GridHost gridHost(grid);

// Actually make the grid on host and sync it on the device

gridHost.MakeGrid(input);

gridHost.SyncToDevice();

// instantiate required objects.

DataBlock data(grid, input);

TimeIntegrator Tint(input,data);

#ifdef WITH_PYTHON

Pydefix pydefix(input);

#endif

Output output(input, data);

Setup mysetup(input, grid, data, output);

idfx::cout << "Main: initialisation finished." << std::endl;

char host[1024];

gethostname(host,1024);

idfx::cout << "Main: running on " << std::string(host) << std::endl;

///////////////////////////////

// Show configuration

///////////////////////////////

if(initKokkosBeforeMPI) {

idfx::cout << "Main: detected your configuration needed Kokkos to be initialised before MPI. "

<< std::endl;

}

input.ShowConfig();

idfx::units.ShowConfig();

grid.ShowConfig();

data.ShowConfig();

Tint.ShowConfig();

#ifdef WITH_PYTHON

pydefix.ShowConfig();

#endif

///////////////////////////////

// Initial conditions (or restart)

///////////////////////////////

// Are we restarting?

if(input.restartRequested) {

if(input.forceInitRequested) {

#ifdef WITH_PYTHON

if(pydefix.haveInitflow) {

idfx::pushRegion("Pydefix::Initflow");

pydefix.InitFlow(data);

} else {

idfx::pushRegion("Setup::Initflow");

mysetup.InitFlow(data);

}

data.DeriveVectorPotential();

idfx::popRegion();

#else

idfx::pushRegion("Setup::Initflow");

mysetup.InitFlow(data);

data.DeriveVectorPotential();

idfx::popRegion();

#endif

}

idfx::cout << "Main: Restarting from dump file." << std::endl;

bool restartSuccess = output.RestartFromDump(data,input.restartFileNumber);

if(!restartSuccess) {

idfx::cout << "Main: restart aborted." << std::endl;

input.restartRequested = false;

} else {

data.SetBoundaries();

}

if(!input.restartRequested) {

idfx::cout << "Main: Creating initial conditions." << std::endl;

#ifdef WITH_PYTHON

if(pydefix.haveInitflow) {

idfx::pushRegion("Pydefix::Initflow");

pydefix.InitFlow(data);

} else {

idfx::pushRegion("Setup::Initflow");

mysetup.InitFlow(data);

}

#else

idfx::pushRegion("Setup::Initflow");

mysetup.InitFlow(data);

#endif

idfx::popRegion();

data.DeriveVectorPotential(); // This does something only when evolveVectorPotential is on

data.SetBoundaries();

data.Validate();

output.CheckForWrites(data);

}

///////////////////////////////

// Main Loop

///////////////////////////////

idfx::cout << "Main: Cycling Time Integrator..." << std::endl;

Kokkos::Timer timer;

output.ResetTimer();

real tstop = input.Get<real>("TimeIntegrator","tstop",0);

while(data.t < tstop) {

if(tstop-data.t < data.dt) data.dt = tstop-data.t;

try {

Tint.Cycle(data);

} catch(std::exception &e) {

idfx::cout << std::endl

<< "Main: WARNING! Caught an exception in TimeIntegrator."

<< std::endl;

#ifdef WITH_MPI

if(!Mpi::CheckSync(5)) {

std::stringstream message;

message << "A non-synchronous exception was raised in TimeIntegrator:" << std::endl;

message << e.what();

message << std::endl << "No emergency output can be produced." << std::endl;

IDEFIX_ERROR(message);

}

#endif

idfx::cout << e.what() << std::endl;

idfx::cout << "Main: attempting to save the current state for inspection." << std::endl;

output.ForceWriteVtk(data);

idfx::cout << "Main: Aborting current calculation." << std::endl;

returnCode = 1;

break;

}

output.CheckForWrites(data);

if(input.CheckForAbort() || Tint.CheckForMaxRuntime() ) {

idfx::cout << "Main: Saving current state and aborting calculation." << std::endl;

output.ForceWriteDump(data);

returnCode = -1;

break;

}

if(input.maxCycles>=0) {

if(Tint.GetNCycles() >= input.maxCycles) {

idfx::cout << "Main: Reached maximum number of integration cycles." << std::endl;

break;

}

int n_days{0}, n_hours{0}, n_minutes{0}, n_seconds{0};

div_t divres;

divres = div(timer.seconds(), 86400);

n_days = divres.quot;

divres = div(divres.rem, 3600);

n_hours = divres.quot;

divres = div(divres.rem, 60);

n_minutes = divres.quot;

n_seconds = divres.rem;

double perfs = timer.seconds() / grid.np_int[IDIR] / grid.np_int[JDIR]

/ grid.np_int[KDIR] / Tint.GetNCycles() * idfx::psize;

idfx::cout << "Main: Reached t=" << data.t << std::endl;

idfx::cout << "Main: Completed in ";

if (n_days > 0) {

idfx::cout << n_days << " day";

if (n_days != 1) {

idfx::cout << "s";

}

idfx::cout << " ";

}

if (n_hours > 0) {

idfx::cout << n_hours << " hour";

if (n_hours != 1) {

idfx::cout << "s";

}

idfx::cout << " ";

}

if (n_minutes > 0) {

idfx::cout << n_minutes << " minute";

if (n_minutes != 1) {

idfx::cout << "s";

}

idfx::cout << " ";

}

idfx::cout << n_seconds << " second";

if (n_seconds != 1) {

idfx::cout << "s";

}

idfx::cout << " ";

idfx::cout << "and " << Tint.GetNCycles() << " cycle";

if (Tint.GetNCycles() != 1) {

idfx::cout << "s";

}

idfx::cout << std::endl;

idfx::cout << "Main: ";

idfx::cout << "Perfs are " << std::scientific << 1/perfs << " cell updates/second" << std::endl;

#ifdef WITH_MPI

idfx::cout << "MPI overhead represents "

<< static_cast<int>(100.0*idfx::mpiCallsTimer/timer.seconds())

<< "% of total run time." << std::endl;

#endif

idfx::cout << "Outputs represent "

<< static_cast<int>(100.0*output.GetTimer()/timer.seconds())

<< "% of total run time." << std::endl;

// Show profiler output

idfx::prof.Show();

}

if(returnCode<0) {

idfx::cout << "Main: Job was interrupted before completion." << std::endl;

} else if (returnCode>0) {

idfx::cout << "Main: Job was aborted because of an unrecoverable error." << std::endl;

} else {

idfx::cout << "Main: Job completed successfully." << std::endl;

}

Kokkos::finalize();

#ifdef WITH_MPI

MPI_Finalize();

#endif

return(0);

}

idefix/src/main.cpp at master · idefix-code/idefix · GitHub

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