engine_maketasks.c 77.9 KB
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/*******************************************************************************
 * This file is part of SWIFT.
 * Copyright (c) 2012 Pedro Gonnet (pedro.gonnet@durham.ac.uk)
 *                    Matthieu Schaller (matthieu.schaller@durham.ac.uk)
 *               2015 Peter W. Draper (p.w.draper@durham.ac.uk)
 *                    Angus Lepper (angus.lepper@ed.ac.uk)
 *               2016 John A. Regan (john.a.regan@durham.ac.uk)
 *                    Tom Theuns (tom.theuns@durham.ac.uk)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/

/* Config parameters. */
#include "../config.h"

/* Some standard headers. */
#include <stdlib.h>
#include <unistd.h>

/* MPI headers. */
#ifdef WITH_MPI
#include <mpi.h>
#endif

/* Load the profiler header, if needed. */
#ifdef WITH_PROFILER
#include <gperftools/profiler.h>
#endif

/* This object's header. */
#include "engine.h"

/* Local headers. */
#include "atomic.h"
#include "cell.h"
#include "clocks.h"
#include "cycle.h"
#include "debug.h"
#include "error.h"
#include "proxy.h"
#include "timers.h"

/**
 * @brief Add send tasks for the gravity pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_grav The send_grav #task, if it has already been created.
 */
void engine_addtasks_send_gravity(struct engine *e, struct cell *ci,
                                  struct cell *cj, struct task *t_grav) {

#ifdef WITH_MPI
  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the gravity tasks are for the target node. */
  for (l = ci->grav.grav; l != NULL; l = l->next)
    if (l->t->ci->nodeID == nodeID ||
        (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
      break;

  /* If so, attach send tasks. */
  if (l != NULL) {

    /* Create the tasks and their dependencies? */
    if (t_grav == NULL) {

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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      t_grav = scheduler_addtask(s, task_type_send, task_subtype_gpart,
                                 ci->mpi.tag, 0, ci, cj);

      /* The sends should unlock the down pass. */
      scheduler_addunlock(s, t_grav, ci->grav.super->grav.down);

      /* Drift before you send */
      scheduler_addunlock(s, ci->grav.super->grav.drift, t_grav);
    }

    /* Add them to the local cell. */
    engine_addlink(e, &ci->mpi.grav.send, t_grav);
  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
        engine_addtasks_send_gravity(e, ci->progeny[k], cj, t_grav);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add send tasks for the hydro pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_xv The send_xv #task, if it has already been created.
 * @param t_rho The send_rho #task, if it has already been created.
 * @param t_gradient The send_gradient #task, if already created.
 */
void engine_addtasks_send_hydro(struct engine *e, struct cell *ci,
                                struct cell *cj, struct task *t_xv,
                                struct task *t_rho, struct task *t_gradient) {

#ifdef WITH_MPI
  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the density tasks are for the target node. */
  for (l = ci->hydro.density; l != NULL; l = l->next)
    if (l->t->ci->nodeID == nodeID ||
        (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
      break;

  /* If so, attach send tasks. */
  if (l != NULL) {

    /* Create the tasks and their dependencies? */
    if (t_xv == NULL) {

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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      t_xv = scheduler_addtask(s, task_type_send, task_subtype_xv, ci->mpi.tag,
                               0, ci, cj);
      t_rho = scheduler_addtask(s, task_type_send, task_subtype_rho,
                                ci->mpi.tag, 0, ci, cj);
#ifdef EXTRA_HYDRO_LOOP
      t_gradient = scheduler_addtask(s, task_type_send, task_subtype_gradient,
                                     ci->mpi.tag, 0, ci, cj);
#endif

#ifdef EXTRA_HYDRO_LOOP

      scheduler_addunlock(s, t_gradient, ci->super->kick2);

      scheduler_addunlock(s, ci->hydro.super->hydro.extra_ghost, t_gradient);

      /* The send_rho task should unlock the super_hydro-cell's extra_ghost
       * task. */
      scheduler_addunlock(s, t_rho, ci->hydro.super->hydro.extra_ghost);

      /* The send_rho task depends on the cell's ghost task. */
      scheduler_addunlock(s, ci->hydro.super->hydro.ghost_out, t_rho);

      /* The send_xv task should unlock the super_hydro-cell's ghost task. */
      scheduler_addunlock(s, t_xv, ci->hydro.super->hydro.ghost_in);

#else
      /* The send_rho task should unlock the super_hydro-cell's kick task. */
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      scheduler_addunlock(s, t_rho, ci->super->end_force);
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      /* The send_rho task depends on the cell's ghost task. */
      scheduler_addunlock(s, ci->hydro.super->hydro.ghost_out, t_rho);

      /* The send_xv task should unlock the super_hydro-cell's ghost task. */
      scheduler_addunlock(s, t_xv, ci->hydro.super->hydro.ghost_in);

#endif

      /* Drift before you send */
      scheduler_addunlock(s, ci->hydro.super->hydro.drift, t_xv);
    }

    /* Add them to the local cell. */
    engine_addlink(e, &ci->mpi.hydro.send_xv, t_xv);
    engine_addlink(e, &ci->mpi.hydro.send_rho, t_rho);
#ifdef EXTRA_HYDRO_LOOP
    engine_addlink(e, &ci->mpi.hydro.send_gradient, t_gradient);
#endif
  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
        engine_addtasks_send_hydro(e, ci->progeny[k], cj, t_xv, t_rho,
                                   t_gradient);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add send tasks for the time-step to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_ti The send_ti #task, if it has already been created.
 */
void engine_addtasks_send_timestep(struct engine *e, struct cell *ci,
                                   struct cell *cj, struct task *t_ti) {

#ifdef WITH_MPI
  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the gravity tasks are for the target node. */
  for (l = ci->grav.grav; l != NULL; l = l->next)
    if (l->t->ci->nodeID == nodeID ||
        (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
      break;

  /* Check whether instead any of the hydro tasks are for the target node. */
  if (l == NULL)
    for (l = ci->hydro.density; l != NULL; l = l->next)
      if (l->t->ci->nodeID == nodeID ||
          (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
        break;

  /* If found anything, attach send tasks. */
  if (l != NULL) {

    /* Create the tasks and their dependencies? */
    if (t_ti == NULL) {

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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      t_ti = scheduler_addtask(s, task_type_send, task_subtype_tend,
                               ci->mpi.tag, 0, ci, cj);

      /* The super-cell's timestep task should unlock the send_ti task. */
      scheduler_addunlock(s, ci->super->timestep, t_ti);
    }

    /* Add them to the local cell. */
    engine_addlink(e, &ci->mpi.send_ti, t_ti);
  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
        engine_addtasks_send_timestep(e, ci->progeny[k], cj, t_ti);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add recv tasks for hydro pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_xv The recv_xv #task, if it has already been created.
 * @param t_rho The recv_rho #task, if it has already been created.
 * @param t_gradient The recv_gradient #task, if it has already been created.
 */
void engine_addtasks_recv_hydro(struct engine *e, struct cell *c,
                                struct task *t_xv, struct task *t_rho,
                                struct task *t_gradient) {

#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

  /* Have we reached a level where there are any hydro tasks ? */
  if (t_xv == NULL && c->hydro.density != NULL) {

#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    /* Create the tasks. */
    t_xv = scheduler_addtask(s, task_type_recv, task_subtype_xv, c->mpi.tag, 0,
                             c, NULL);
    t_rho = scheduler_addtask(s, task_type_recv, task_subtype_rho, c->mpi.tag,
                              0, c, NULL);
#ifdef EXTRA_HYDRO_LOOP
    t_gradient = scheduler_addtask(s, task_type_recv, task_subtype_gradient,
                                   c->mpi.tag, 0, c, NULL);
#endif
  }

  c->mpi.hydro.recv_xv = t_xv;
  c->mpi.hydro.recv_rho = t_rho;
  c->mpi.hydro.recv_gradient = t_gradient;

  /* Add dependencies. */
  if (c->hydro.sorts != NULL) scheduler_addunlock(s, t_xv, c->hydro.sorts);

  for (struct link *l = c->hydro.density; l != NULL; l = l->next) {
    scheduler_addunlock(s, t_xv, l->t);
    scheduler_addunlock(s, l->t, t_rho);
  }
#ifdef EXTRA_HYDRO_LOOP
  for (struct link *l = c->hydro.gradient; l != NULL; l = l->next) {
    scheduler_addunlock(s, t_rho, l->t);
    scheduler_addunlock(s, l->t, t_gradient);
  }
  for (struct link *l = c->hydro.force; l != NULL; l = l->next)
    scheduler_addunlock(s, t_gradient, l->t);
#else
  for (struct link *l = c->hydro.force; l != NULL; l = l->next)
    scheduler_addunlock(s, t_rho, l->t);
#endif

  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_addtasks_recv_hydro(e, c->progeny[k], t_xv, t_rho, t_gradient);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add recv tasks for gravity pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_grav The recv_gpart #task, if it has already been created.
 */
void engine_addtasks_recv_gravity(struct engine *e, struct cell *c,
                                  struct task *t_grav) {

#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

  /* Have we reached a level where there are any gravity tasks ? */
  if (t_grav == NULL && c->grav.grav != NULL) {

#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    /* Create the tasks. */
    t_grav = scheduler_addtask(s, task_type_recv, task_subtype_gpart,
                               c->mpi.tag, 0, c, NULL);
  }

  c->mpi.grav.recv = t_grav;

  for (struct link *l = c->grav.grav; l != NULL; l = l->next)
    scheduler_addunlock(s, t_grav, l->t);

  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_addtasks_recv_gravity(e, c->progeny[k], t_grav);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add recv tasks for gravity pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_ti The recv_ti #task, if already been created.
 */
void engine_addtasks_recv_timestep(struct engine *e, struct cell *c,
                                   struct task *t_ti) {

#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

  /* Have we reached a level where there are any self/pair tasks ? */
  if (t_ti == NULL && (c->grav.grav != NULL || c->hydro.density != NULL)) {

#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    t_ti = scheduler_addtask(s, task_type_recv, task_subtype_tend, c->mpi.tag,
                             0, c, NULL);
  }

  c->mpi.recv_ti = t_ti;

  for (struct link *l = c->grav.grav; l != NULL; l = l->next)
    scheduler_addunlock(s, l->t, t_ti);

  for (struct link *l = c->hydro.force; l != NULL; l = l->next)
    scheduler_addunlock(s, l->t, t_ti);

  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_addtasks_recv_timestep(e, c->progeny[k], t_ti);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Generate the hydro hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- timestep version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_common(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;
  const int is_with_cooling = (e->policy & engine_policy_cooling);
  const int is_with_star_formation = (e->policy & engine_policy_star_formation);

  /* Are we in a super-cell ? */
  if (c->super == c) {

    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      /* Add the two half kicks */
      c->kick1 = scheduler_addtask(s, task_type_kick1, task_subtype_none, 0, 0,
                                   c, NULL);

#if defined(WITH_LOGGER)
      c->logger = scheduler_addtask(s, task_type_logger, task_subtype_none, 0,
                                    0, c, NULL);
#endif

      c->kick2 = scheduler_addtask(s, task_type_kick2, task_subtype_none, 0, 0,
                                   c, NULL);

      /* Add the time-step calculation task and its dependency */
      c->timestep = scheduler_addtask(s, task_type_timestep, task_subtype_none,
                                      0, 0, c, NULL);

      /* Add the task finishing the force calculation */
      c->end_force = scheduler_addtask(s, task_type_end_force,
                                       task_subtype_none, 0, 0, c, NULL);

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      /* Subgrid tasks */
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      if (is_with_cooling) {

        c->hydro.cooling = scheduler_addtask(s, task_type_cooling,
                                             task_subtype_none, 0, 0, c, NULL);

        scheduler_addunlock(s, c->end_force, c->hydro.cooling);
        scheduler_addunlock(s, c->hydro.cooling, c->kick2);

      } else {
        scheduler_addunlock(s, c->end_force, c->kick2);
      }

      if (is_with_star_formation) {

        c->hydro.star_formation = scheduler_addtask(
            s, task_type_star_formation, task_subtype_none, 0, 0, c, NULL);

        scheduler_addunlock(s, c->kick2, c->hydro.star_formation);
        scheduler_addunlock(s, c->hydro.star_formation, c->timestep);

      } else {
        scheduler_addunlock(s, c->kick2, c->timestep);
      }
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      scheduler_addunlock(s, c->timestep, c->kick1);

#if defined(WITH_LOGGER)
      scheduler_addunlock(s, c->kick1, c->logger);
#endif
    }
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  } else { /* We are above the super-cell so need to go deeper */
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    /* Recurse. */
    if (c->split)
      for (int k = 0; k < 8; k++)
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        if (c->progeny[k] != NULL)
          engine_make_hierarchical_tasks_common(e, c->progeny[k]);
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  }
}

/**
 * @brief Generate the hydro hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- gravity version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_gravity(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;
  const int periodic = e->s->periodic;
  const int is_self_gravity = (e->policy & engine_policy_self_gravity);

  /* Are we in a super-cell ? */
  if (c->grav.super == c) {

    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      c->grav.drift = scheduler_addtask(s, task_type_drift_gpart,
                                        task_subtype_none, 0, 0, c, NULL);

      if (is_self_gravity) {

        /* Initialisation of the multipoles */
        c->grav.init = scheduler_addtask(s, task_type_init_grav,
                                         task_subtype_none, 0, 0, c, NULL);

        /* Gravity non-neighbouring pm calculations */
        c->grav.long_range = scheduler_addtask(
            s, task_type_grav_long_range, task_subtype_none, 0, 0, c, NULL);

        /* Gravity recursive down-pass */
        c->grav.down = scheduler_addtask(s, task_type_grav_down,
                                         task_subtype_none, 0, 0, c, NULL);

        /* Implicit tasks for the up and down passes */
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        c->grav.drift_out = scheduler_addtask(s, task_type_drift_gpart_out,
                                              task_subtype_none, 0, 1, c, NULL);
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        c->grav.init_out = scheduler_addtask(s, task_type_init_grav_out,
                                             task_subtype_none, 0, 1, c, NULL);
        c->grav.down_in = scheduler_addtask(s, task_type_grav_down_in,
                                            task_subtype_none, 0, 1, c, NULL);

        /* Gravity mesh force propagation */
        if (periodic)
          c->grav.mesh = scheduler_addtask(s, task_type_grav_mesh,
                                           task_subtype_none, 0, 0, c, NULL);

        if (periodic) scheduler_addunlock(s, c->grav.drift, c->grav.mesh);
        if (periodic) scheduler_addunlock(s, c->grav.mesh, c->grav.down);
        scheduler_addunlock(s, c->grav.init, c->grav.long_range);
        scheduler_addunlock(s, c->grav.long_range, c->grav.down);
        scheduler_addunlock(s, c->grav.down, c->super->end_force);

        /* Link in the implicit tasks */
        scheduler_addunlock(s, c->grav.init, c->grav.init_out);
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        scheduler_addunlock(s, c->grav.drift, c->grav.drift_out);
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        scheduler_addunlock(s, c->grav.down_in, c->grav.down);
      }
    }
  }

  /* We are below the super-cell but not below the maximal splitting depth */
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  else if ((c->grav.super != NULL) &&
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           ((c->maxdepth - c->depth) >= space_subdepth_diff_grav)) {
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    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      if (is_self_gravity) {

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        c->grav.drift_out = scheduler_addtask(s, task_type_drift_gpart_out,
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        c->grav.init_out = scheduler_addtask(s, task_type_init_grav_out,
                                             task_subtype_none, 0, 1, c, NULL);

        c->grav.down_in = scheduler_addtask(s, task_type_grav_down_in,
                                            task_subtype_none, 0, 1, c, NULL);

        scheduler_addunlock(s, c->parent->grav.init_out, c->grav.init_out);
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        scheduler_addunlock(s, c->parent->grav.drift_out, c->grav.drift_out);
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        scheduler_addunlock(s, c->grav.down_in, c->parent->grav.down_in);
      }
    }
  }

  /* Recurse but not below the maximal splitting depth */
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  if (c->split && ((c->maxdepth - c->depth) >= space_subdepth_diff_grav))
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    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_make_hierarchical_tasks_gravity(e, c->progeny[k]);
}

/**
 * @brief Recursively add non-implicit star ghost tasks to a cell hierarchy.
 */
void engine_add_stars_ghosts(struct engine *e, struct cell *c,
                             struct task *stars_ghost_in,
                             struct task *stars_ghost_out) {

  /* If we have reached the leaf OR have to few particles to play with*/
  if (!c->split || c->stars.count < engine_max_sparts_per_ghost) {

    /* Add the ghost task and its dependencies */
    struct scheduler *s = &e->sched;
    c->stars.ghost = scheduler_addtask(s, task_type_stars_ghost,
                                       task_subtype_none, 0, 0, c, NULL);
    scheduler_addunlock(s, stars_ghost_in, c->stars.ghost);
    scheduler_addunlock(s, c->stars.ghost, stars_ghost_out);
  } else {
    /* Keep recursing */
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_add_stars_ghosts(e, c->progeny[k], stars_ghost_in,
                                stars_ghost_out);
  }
}

/**
 * @brief Recursively add non-implicit ghost tasks to a cell hierarchy.
 */
void engine_add_ghosts(struct engine *e, struct cell *c, struct task *ghost_in,
                       struct task *ghost_out) {

  /* If we have reached the leaf OR have to few particles to play with*/
  if (!c->split || c->hydro.count < engine_max_parts_per_ghost) {

    /* Add the ghost task and its dependencies */
    struct scheduler *s = &e->sched;
    c->hydro.ghost =
        scheduler_addtask(s, task_type_ghost, task_subtype_none, 0, 0, c, NULL);
    scheduler_addunlock(s, ghost_in, c->hydro.ghost);
    scheduler_addunlock(s, c->hydro.ghost, ghost_out);
  } else {
    /* Keep recursing */
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_add_ghosts(e, c->progeny[k], ghost_in, ghost_out);
  }
}

/**
 * @brief Generate the hydro hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- hydro version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_hydro(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;
  const int is_with_sourceterms = (e->policy & engine_policy_sourceterms);

  /* Are we in a super-cell ? */
  if (c->hydro.super == c) {

    /* Add the sort task. */
    c->hydro.sorts =
        scheduler_addtask(s, task_type_sort, task_subtype_none, 0, 0, c, NULL);

    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      /* Add the drift task. */
      c->hydro.drift = scheduler_addtask(s, task_type_drift_part,
                                         task_subtype_none, 0, 0, c, NULL);

      /* Generate the ghost tasks. */
      c->hydro.ghost_in =
          scheduler_addtask(s, task_type_ghost_in, task_subtype_none, 0,
                            /* implicit = */ 1, c, NULL);
      c->hydro.ghost_out =
          scheduler_addtask(s, task_type_ghost_out, task_subtype_none, 0,
                            /* implicit = */ 1, c, NULL);
      engine_add_ghosts(e, c, c->hydro.ghost_in, c->hydro.ghost_out);

#ifdef EXTRA_HYDRO_LOOP
      /* Generate the extra ghost task. */
      c->hydro.extra_ghost = scheduler_addtask(
          s, task_type_extra_ghost, task_subtype_none, 0, 0, c, NULL);
#endif

      /* add source terms */
      if (is_with_sourceterms) {
        c->sourceterms = scheduler_addtask(s, task_type_sourceterms,
                                           task_subtype_none, 0, 0, c, NULL);
      }
    }

  } else { /* We are above the super-cell so need to go deeper */

    /* Recurse. */
    if (c->split)
      for (int k = 0; k < 8; k++)
        if (c->progeny[k] != NULL)
          engine_make_hierarchical_tasks_hydro(e, c->progeny[k]);
  }
}

/**
 * @brief Generate the stars hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- star version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_stars(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;

  /* Are we in a super-cell ? */
  if (c->super == c) {

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    /* Add the sort task. */
    c->stars.sorts = scheduler_addtask(s, task_type_stars_sort,
                                       task_subtype_none, 0, 0, c, NULL);

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    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      /* Generate the ghost tasks. */
      c->stars.ghost_in =
          scheduler_addtask(s, task_type_stars_ghost_in, task_subtype_none, 0,
                            /* implicit = */ 1, c, NULL);
      c->stars.ghost_out =
          scheduler_addtask(s, task_type_stars_ghost_out, task_subtype_none, 0,
                            /* implicit = */ 1, c, NULL);
      engine_add_stars_ghosts(e, c, c->stars.ghost_in, c->stars.ghost_out);
    }
  } else { /* We are above the super-cell so need to go deeper */

    /* Recurse. */
    if (c->split)
      for (int k = 0; k < 8; k++)
        if (c->progeny[k] != NULL)
          engine_make_hierarchical_tasks_stars(e, c->progeny[k]);
  }
}

/**
 * @brief Constructs the top-level tasks for the short-range gravity
 * and long-range gravity interactions.
 *
 * - All top-cells get a self task.
 * - All pairs within range according to the multipole acceptance
 *   criterion get a pair task.
 */
void engine_make_self_gravity_tasks_mapper(void *map_data, int num_elements,
                                           void *extra_data) {

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  struct engine *e = (struct engine *)extra_data;
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  struct space *s = e->s;
  struct scheduler *sched = &e->sched;
  const int nodeID = e->nodeID;
  const int periodic = s->periodic;
  const double dim[3] = {s->dim[0], s->dim[1], s->dim[2]};
  const int cdim[3] = {s->cdim[0], s->cdim[1], s->cdim[2]};
  struct cell *cells = s->cells_top;
  const double theta_crit = e->gravity_properties->theta_crit;
  const double max_distance = e->mesh->r_cut_max;
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  const double max_distance2 = max_distance * max_distance;
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  /* Compute how many cells away we need to walk */
  const double distance = 2.5 * cells[0].width[0] / theta_crit;
  int delta = (int)(distance / cells[0].width[0]) + 1;
  int delta_m = delta;
  int delta_p = delta;

  /* Special case where every cell is in range of every other one */
  if (delta >= cdim[0] / 2) {
    if (cdim[0] % 2 == 0) {
      delta_m = cdim[0] / 2;
      delta_p = cdim[0] / 2 - 1;
    } else {
      delta_m = cdim[0] / 2;
      delta_p = cdim[0] / 2;
    }
  }

  /* Loop through the elements, which are just byte offsets from NULL. */
  for (int ind = 0; ind < num_elements; ind++) {

    /* Get the cell index. */
    const int cid = (size_t)(map_data) + ind;

    /* Integer indices of the cell in the top-level grid */
    const int i = cid / (cdim[1] * cdim[2]);
    const int j = (cid / cdim[2]) % cdim[1];
    const int k = cid % cdim[2];

    /* Get the cell */
    struct cell *ci = &cells[cid];

    /* Skip cells without gravity particles */
    if (ci->grav.count == 0) continue;

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    /* If the cell is local build a self-interaction */
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    if (ci->nodeID == nodeID) {
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      scheduler_addtask(sched, task_type_self, task_subtype_grav, 0, 0, ci,
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                        NULL);
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    }
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    /* Loop over every other cell within (Manhattan) range delta */
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    for (int ii = -delta_m; ii <= delta_p; ii++) {
      int iii = i + ii;
      if (!periodic && (iii < 0 || iii >= cdim[0])) continue;
      iii = (iii + cdim[0]) % cdim[0];
      for (int jj = -delta_m; jj <= delta_p; jj++) {
        int jjj = j + jj;
        if (!periodic && (jjj < 0 || jjj >= cdim[1])) continue;
        jjj = (jjj + cdim[1]) % cdim[1];
        for (int kk = -delta_m; kk <= delta_p; kk++) {
          int kkk = k + kk;
          if (!periodic && (kkk < 0 || kkk >= cdim[2])) continue;
          kkk = (kkk + cdim[2]) % cdim[2];
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          /* Get the cell */
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          const int cjd = cell_getid(cdim, iii, jjj, kkk);
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          struct cell *cj = &cells[cjd];

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          /* Avoid duplicates, empty cells and completely foreign pairs */
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          if (cid >= cjd || cj->grav.count == 0 ||
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              (ci->nodeID != nodeID && cj->nodeID != nodeID))
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            continue;
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          /* Recover the multipole information */
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          const struct gravity_tensors *multi_i = ci->grav.multipole;
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          const struct gravity_tensors *multi_j = cj->grav.multipole;

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          if (multi_i == NULL && ci->nodeID != nodeID)
            error("Multipole of ci was not exchanged properly via the proxies");
          if (multi_j == NULL && cj->nodeID != nodeID)
            error("Multipole of cj was not exchanged properly via the proxies");
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          /* Minimal distance between any pair of particles */
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          const double min_radius2 =
              cell_min_dist2_same_size(ci, cj, periodic, dim);
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          /* Are we beyond the distance where the truncated forces are 0 ?*/
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          if (periodic && min_radius2 > max_distance2) continue;
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          /* Are the cells too close for a MM interaction ? */
          if (!cell_can_use_pair_mm_rebuild(ci, cj, e, s)) {

            /* Ok, we need to add a direct pair calculation */
            scheduler_addtask(sched, task_type_pair, task_subtype_grav, 0, 0,
                              ci, cj);
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#ifdef SWIFT_DEBUG_CHECKS
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#ifdef WITH_MPI

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            /* Let's cross-check that we had a proxy for that cell */
            if (ci->nodeID == nodeID && cj->nodeID != engine_rank) {

              /* Find the proxy for this node */
              const int proxy_id = e->proxy_ind[cj->nodeID];
              if (proxy_id < 0)
                error("No proxy exists for that foreign node %d!", cj->nodeID);

              const struct proxy *p = &e->proxies[proxy_id];

              /* Check whether the cell exists in the proxy */
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              int n = 0;
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              for (; n < p->nr_cells_in; n++)
                if (p->cells_in[n] == cj) {
                  break;
                }
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              if (n == p->nr_cells_in)
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                error(
                    "Cell %d not found in the proxy but trying to construct "
                    "grav task!",
                    cjd);
            } else if (cj->nodeID == nodeID && ci->nodeID != engine_rank) {

              /* Find the proxy for this node */
              const int proxy_id = e->proxy_ind[ci->nodeID];
              if (proxy_id < 0)
                error("No proxy exists for that foreign node %d!", ci->nodeID);

              const struct proxy *p = &e->proxies[proxy_id];

              /* Check whether the cell exists in the proxy */
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              int n = 0;
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              for (; n < p->nr_cells_in; n++)
                if (p->cells_in[n] == ci) {
                  break;
                }
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              if (n == p->nr_cells_in)
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                error(
                    "Cell %d not found in the proxy but trying to construct "
                    "grav task!",
                    cid);
            }
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#endif /* WITH_MPI */
#endif /* SWIFT_DEBUG_CHECKS */
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          }
        }
      }
    }
  }
}

void engine_make_hierarchical_tasks_mapper(void *map_data, int num_elements,
                                           void *extra_data) {
  struct engine *e = (struct engine *)extra_data;
  const int is_with_hydro = (e->policy & engine_policy_hydro);
  const int is_with_self_gravity = (e->policy & engine_policy_self_gravity);
  const int is_with_external_gravity =
      (e->policy & engine_policy_external_gravity);
  const int is_with_feedback = (e->policy & engine_policy_feedback);

  for (int ind = 0; ind < num_elements; ind++) {
    struct cell *c = &((struct cell *)map_data)[ind];
    /* Make the common tasks (time integration) */
    engine_make_hierarchical_tasks_common(e, c);
    /* Add the hydro stuff */
    if (is_with_hydro) engine_make_hierarchical_tasks_hydro(e, c);
    /* And the gravity stuff */
    if (is_with_self_gravity || is_with_external_gravity)
      engine_make_hierarchical_tasks_gravity(e, c);
    if (is_with_feedback) engine_make_hierarchical_tasks_stars(e, c);
  }
}

/**
 * @brief Constructs the top-level tasks for the external gravity.
 *
 * @param e The #engine.
 */
void engine_make_external_gravity_tasks(struct engine *e) {

  struct space *s = e->s;
  struct scheduler *sched = &e->sched;
  const int nodeID = e->nodeID;
  struct cell *cells = s->cells_top;
  const int nr_cells = s->nr_cells;

  for (int cid = 0; cid < nr_cells; ++cid) {

    struct cell *ci = &cells[cid];

    /* Skip cells without gravity particles */
    if (ci->grav.count == 0) continue;

    /* Is that neighbour local ? */
    if (ci->nodeID != nodeID) continue;

    /* If the cell is local, build a self-interaction */
    scheduler_addtask(sched, task_type_self, task_subtype_external_grav, 0, 0,
                      ci, NULL);
  }
}

/**
 * @brief Counts the tasks associated with one cell and constructs the links
 *
 * For each hydrodynamic and gravity task, construct the links with
 * the corresponding cell.  Similarly, construct the dependencies for
 * all the sorting tasks.
 */
void engine_count_and_link_tasks_mapper(void *map_data, int num_elements,
                                        void *extra_data) {

  struct engine *e = (struct engine *)extra_data;
  struct scheduler *const sched = &e->sched;

  for (int ind = 0; ind < num_elements; ind++) {
    struct task *t = &((struct task *)map_data)[ind];

    struct cell *ci = t->ci;
    struct cell *cj = t->cj;
    const enum task_types t_type = t->type;
    const enum task_subtypes t_subtype = t->subtype;

    /* Link sort tasks to all the higher sort task. */
    if (t_type == task_type_sort) {
      for (struct cell *finger = t->ci->parent; finger != NULL;
           finger = finger->parent)
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