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Commit aa075f20 authored by Matthieu Schaller's avatar Matthieu Schaller
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Added linking of the FFTW 3.x library

parent 35bf96ad
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configure.ac
View file @ aa075f20
......@@ -344,6 +344,17 @@ if test "$ac_cv_func_pthread_setaffinity_np" = "yes"; then
fi
fi
# Check for FFTW
have_fftw3="no"
AC_CHECK_HEADER([fftw3.h])
if test "$ac_cv_header_fftw3_h" = "yes"; then
AC_CHECK_LIB([fftw3],[fftw_malloc], [AC_DEFINE([HAVE_FFTW],
[1],[Defined if FFTW 3.x exists.])] )
FFTW_LIBS="-lfftw3"
have_fftw3="yes"
fi
AC_SUBST([FFTW_LIBS])
# Check for Intel intrinsics header optionally used by vector.h.
AC_CHECK_HEADERS([immintrin.h])
......@@ -409,6 +420,7 @@ AC_MSG_RESULT([
HDF5 enabled : $with_hdf5
- parallel : $have_parallel_hdf5
Metis enabled : $have_metis
FFTW3 enabled : $have_fftw3
libNUMA enabled : $have_numa
])
......
examples/Makefile.am
View file @ aa075f20
......@@ -46,20 +46,20 @@ endif
# Sources for swift
swift_SOURCES = main.c
swift_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) -DENGINE_POLICY="engine_policy_keep $(ENGINE_POLICY_SETAFFINITY)"
swift_LDADD = ../src/.libs/libswiftsim.a $(HDF5_LDFLAGS) $(HDF5_LIBS)
swift_LDADD = ../src/.libs/libswiftsim.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(FFTW_LIBS)
swift_fixdt_SOURCES = main.c
swift_fixdt_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) -DENGINE_POLICY="engine_policy_fixdt | engine_policy_keep $(ENGINE_POLICY_SETAFFINITY)"
swift_fixdt_LDADD = ../src/.libs/libswiftsim.a $(HDF5_LDFLAGS) $(HDF5_LIBS)
swift_fixdt_LDADD = ../src/.libs/libswiftsim.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(FFTW_LIBS)
# Sources for swift_mpi, do we need an affinity policy for MPI?
swift_mpi_SOURCES = main.c
swift_mpi_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) $(MPI_FLAGS) -DENGINE_POLICY="engine_policy_keep $(ENGINE_POLICY_SETAFFINITY)"
swift_mpi_LDADD = ../src/.libs/libswiftsim_mpi.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(MPI_LIBS)
swift_mpi_LDADD = ../src/.libs/libswiftsim_mpi.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(FFTW_LIBS) $(MPI_LIBS)
swift_fixdt_mpi_SOURCES = main.c
swift_fixdt_mpi_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) $(MPI_FLAGS) -DENGINE_POLICY="engine_policy_fixdt | engine_policy_keep $(ENGINE_POLICY_SETAFFINITY)"
swift_fixdt_mpi_LDADD = ../src/.libs/libswiftsim_mpi.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(MPI_LIBS)
swift_fixdt_mpi_LDADD = ../src/.libs/libswiftsim_mpi.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(FFTW_LIBS) $(MPI_LIBS)
# Scripts to generate ICs
EXTRA_DIST = UniformBox/makeIC.py UniformBox/run.sh UniformBox/uniformBox.yml \
......
src/Makefile.am
View file @ aa075f20
......@@ -17,10 +17,10 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Add the debug flag to the whole thing
AM_CFLAGS = -DTIMER -DCOUNTER $(HDF5_CPPFLAGS)
AM_CFLAGS = -DTIMER $(HDF5_CPPFLAGS)
# Assign a "safe" version number
AM_LDFLAGS = $(LAPACK_LIBS) $(BLAS_LIBS) $(HDF5_LDFLAGS) -version-info 0:0:0 # -fsanitize=address
AM_LDFLAGS = $(HDF5_LDFLAGS) $(FFTW_LIBS) -version-info 0:0:0 # -fsanitize=address
# The git command, if available.
GIT_CMD = @GIT_CMD@
......@@ -70,6 +70,7 @@ libswiftsim_la_SOURCES = $(AM_SOURCES)
# Sources and flags for MPI library
libswiftsim_mpi_la_SOURCES = $(AM_SOURCES)
libswiftsim_mpi_la_CFLAGS = $(AM_CFLAGS) -DWITH_MPI $(METIS_INCS)
libswiftsim_mpi_la_LDFLAGS = $(AM_LDFLAGS) $(METIS_LIBS)
libswiftsim_mpi_la_SHORTNAME = mpi
......
src/runner_doiact_grav_old.h deleted 100644 → 0
View file @ 35bf96ad
/*******************************************************************************
* This file is part of SWIFT.
* Copyright (c) 2013 Pedro Gonnet (pedro.gonnet@durham.ac.uk)
* 2016 Matthieu Schaller (matthieu.schaller@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/>.
*
******************************************************************************/
#ifndef SWIFT_RUNNER_DOIACT_GRAV_H
#define SWIFT_RUNNER_DOIACT_GRAV_H
/* Includes. */
#include "cell.h"
#include "clocks.h"
#include "part.h"
/* /\** */
/* * @brief Compute the sorted gravity interactions between a cell pair. */
/* * */
/* * @param r The #runner. */
/* * @param ci The first #cell. */
/* * @param cj The second #cell. */
/* *\/ */
/* void runner_dopair_grav_new(struct runner *r, struct cell *ci, */
/* struct cell *cj) { */
/* struct engine *restrict e = r->e; */
/* int pid, pjd, k, sid; */
/* double rshift, shift[3] = {0.0, 0.0, 0.0}, nshift[3]; */
/* struct entry *restrict sort_i, *restrict sort_j; */
/* struct gpart *restrict pi, *restrict pj, *restrict parts_i, *restrict
* parts_j; */
/* double pix[3]; */
/* float dx[3], r2, h_max, di, dj; */
/* int count_i, count_j, cnj, cnj_new; */
/* const int ti_current = e->ti_current; */
/* struct multipole m; */
/* #ifdef VECTORIZE */
/* int icount = 0; */
/* float r2q[VEC_SIZE] __attribute__((aligned(16))); */
/* float dxq[3 * VEC_SIZE] __attribute__((aligned(16))); */
/* struct gpart *piq[VEC_SIZE], *pjq[VEC_SIZE]; */
/* #endif */
/* TIMER_TIC */
/* /\* Anything to do here? *\/ */
/* if (ci->ti_end_min > ti_current && cj->ti_end_min > ti_current) return; */
/* /\* Get the sort ID. *\/ */
/* sid = space_getsid(e->s, &ci, &cj, shift); */
/* /\* Make sure the cells are sorted. *\/ */
/* runner_dogsort(r, ci, (1 << sid), 0); */
/* runner_dogsort(r, cj, (1 << sid), 0); */
/* /\* Have the cells been sorted? *\/ */
/* if (!(ci->gsorted & (1 << sid)) || !(cj->gsorted & (1 << sid))) */
/* error("Trying to interact unsorted cells."); */
/* /\* Get the cutoff shift. *\/ */
/* for (rshift = 0.0, k = 0; k < 3; k++) */
/* rshift += shift[k] * runner_shift[3 * sid + k]; */
/* /\* Pick-out the sorted lists. *\/ */
/* sort_i = &ci->gsort[sid * (ci->count + 1)]; */
/* sort_j = &cj->gsort[sid * (cj->count + 1)]; */
/* /\* Get some other useful values. *\/ */
/* h_max = */
/* sqrtf(ci->h[0] * ci->h[0] + ci->h[1] * ci->h[1] + ci->h[2] * ci->h[2])
* * */
/* const_theta_max; */
/* count_i = ci->gcount; */
/* count_j = cj->gcount; */
/* parts_i = ci->gparts; */
/* parts_j = cj->gparts; */
/* cnj = count_j; */
/* multipole_reset(&m); */
/* nshift[0] = -shift[0]; */
/* nshift[1] = -shift[1]; */
/* nshift[2] = -shift[2]; */
/* /\* Loop over the parts in ci. *\/ */
/* for (pid = count_i - 1; pid >= 0; pid--) { */
/* /\* Get a hold of the ith part in ci. *\/ */
/* pi = &parts_i[sort_i[pid].i]; */
/* if (pi->ti_end > ti_current) continue; */
/* di = sort_i[pid].d + h_max - rshift; */
/* for (k = 0; k < 3; k++) pix[k] = pi->x[k] - shift[k]; */
/* /\* Loop over the parts in cj. *\/ */
/* for (pjd = 0; pjd < cnj && sort_j[pjd].d < di; pjd++) { */
/* /\* Get a pointer to the jth particle. *\/ */
/* pj = &parts_j[sort_j[pjd].i]; */
/* /\* Compute the pairwise distance. *\/ */
/* r2 = 0.0f; */
/* for (k = 0; k < 3; k++) { */
/* dx[k] = pix[k] - pj->x[k]; */
/* r2 += dx[k] * dx[k]; */
/* } */
/* #ifndef VECTORIZE */
/* // if ( pi->part->id == 3473472412525 || pj->part->id == 3473472412525
* ) */
/* // message( "interacting particles pi=%lli and pj=%lli with r=%.3e
* in */
/* // cells %lli/%lli." , pi->part->id , pj->part->id , sqrtf(r2) , ((long
*/
/* // long int)ci) / sizeof(struct cell) , ((long long int)cj) / */
/* // sizeof(struct cell) ); */
/* runner_iact_grav(r2, dx, pi, pj); */
/* #else */
/* /\* Add this interaction to the queue. *\/ */
/* r2q[icount] = r2; */
/* dxq[3 * icount + 0] = dx[0]; */
/* dxq[3 * icount + 1] = dx[1]; */
/* dxq[3 * icount + 2] = dx[2]; */
/* piq[icount] = pi; */
/* pjq[icount] = pj; */
/* icount += 1; */
/* /\* Flush? *\/ */
/* if (icount == VEC_SIZE) { */
/* runner_iact_vec_grav(r2q, dxq, piq, pjq); */
/* icount = 0; */
/* } */
/* #endif */
/* } /\* loop over the parts in cj. *\/ */
/* /\* Set the new limit. *\/ */
/* cnj_new = pjd; */
/* /\* Add trailing parts to the multipole. *\/ */
/* for (pjd = cnj_new; pjd < cnj; pjd++) { */
/* /\* Add the part to the multipole. *\/ */
/* multipole_addpart(&m, &parts_j[sort_j[pjd].i]); */
/* } /\* add trailing parts to the multipole. *\/ */
/* /\* Set the new cnj. *\/ */
/* cnj = cnj_new; */
/* /\* Interact the ith particle with the multipole. *\/ */
/* multipole_iact_mp(&m, pi, nshift); */
/* } /\* loop over the parts in ci. *\/ */
/* #ifdef VECTORIZE */
/* /\* Pick up any leftovers. *\/ */
/* if (icount > 0) */
/* for (k = 0; k < icount; k++) */
/* runner_iact_grav(r2q[k], &dxq[3 * k], piq[k], pjq[k]); */
/* #endif */
/* /\* Re-set the multipole. *\/ */
/* multipole_reset(&m); */
/* /\* Loop over the parts in cj and interact with the multipole in ci. *\/ */
/* for (pid = count_i - 1, pjd = 0; pjd < count_j; pjd++) { */
/* /\* Get the position of pj along the axis. *\/ */
/* dj = sort_j[pjd].d - h_max + rshift; */
/* /\* Add any left-over parts in cell_i to the multipole. *\/ */
/* while (pid >= 0 && sort_i[pid].d < dj) { */
/* /\* Add this particle to the multipole. *\/ */
/* multipole_addpart(&m, &parts_i[sort_i[pid].i]); */
/* /\* Decrease pid. *\/ */
/* pid -= 1; */
/* } */
/* /\* Interact pj with the multipole. *\/ */
/* multipole_iact_mp(&m, &parts_j[sort_j[pjd].i], shift); */
/* } /\* loop over the parts in cj and interact with the multipole. *\/ */
/* TIMER_TOC(TIMER_DOPAIR); */
/* } */
/**
* @brief Compute the recursive upward sweep, i.e. construct the
* multipoles in a cell hierarchy.
*
* @param r The #runner.
* @param c The top-level #cell.
*/
void runner_dograv_up(struct runner *r, struct cell *c) {
if (c->split) { /* Regular node */
/* Recurse. */
for (int k = 0; k < 8; k++)
if (c->progeny[k] != NULL) runner_dograv_up(r, c->progeny[k]);
/* Collect the multipoles from the progeny. */
multipole_reset(&c->multipole);
for (int k = 0; k < 8; k++) {
if (c->progeny[k] != NULL)
multipole_add(&c->multipole, &c->progeny[k]->multipole);
}
} else { /* Leaf node. */
/* Just construct the multipole from the gparts. */
multipole_init(&c->multipole, c->gparts, c->gcount);
}
}
/* /\** */
/* * @brief Compute the recursive downward sweep, i.e. apply the multipole */
/* * acceleration on all the particles. */
/* * */
/* * @param r The #runner. */
/* * @param c The top-level #cell. */
/* *\/ */
/* void runner_dograv_down(struct runner *r, struct cell *c) { */
/* struct multipole *m = &c->multipole; */
/* /\* Split? *\/ */
/* if (c->split) { */
/* /\* Apply this cell's acceleration on the multipoles below. *\/ */
/* for (int k = 0; k < 8; k++) */
/* if (c->progeny[k] != NULL) { */
/* struct multipole *mp = &c->progeny[k]->multipole; */
/* mp->a[0] += m->a[0]; */
/* mp->a[1] += m->a[1]; */
/* mp->a[2] += m->a[2]; */
/* } */
/* /\* Recurse. *\/ */
/* for (int k = 0; k < 8; k++) */
/* if (c->progeny[k] != NULL) runner_dograv_down(r, c->progeny[k]); */
/* } */
/* /\* No, leaf node. *\/ */
/* else { */
/* /\* Apply the multipole acceleration to all gparts. *\/ */
/* for (int k = 0; k < c->gcount; k++) { */
/* struct gpart *p = &c->gparts[k]; */
/* p->a_grav[0] += m->a[0]; */
/* p->a_grav[1] += m->a[1]; */
/* p->a_grav[2] += m->a[2]; */
/* } */
/* } */
/* } */
/* /\** */
/* * @brief Compute the multipole-multipole interaction between two cells. */
/* * */
/* * @param r The #runner. */
/* * @param ci The first #cell. */
/* * @param cj The second #cell. */
/* *\/ */
/* void runner_dograv_mm(struct runner *r, struct cell *restrict ci, */
/* struct cell *restrict cj) { */
/* struct engine *e = r->e; */
/* int k; */
/* double shift[3] = {0.0, 0.0, 0.0}; */
/* float dx[3], theta; */
/* /\* Compute the shift between the cells. *\/ */
/* for (k = 0; k < 3; k++) { */
/* dx[k] = cj->loc[k] - ci->loc[k]; */
/* if (r->e->s->periodic) { */
/* if (dx[k] < -e->s->dim[k] / 2) */
/* shift[k] = e->s->dim[k]; */
/* else if (dx[k] > e->s->dim[k] / 2) */
/* shift[k] = -e->s->dim[k]; */
/* dx[k] += shift[k]; */
/* } */
/* } */
/* theta = */
/* sqrt((dx[0] * dx[0] + dx[1] * dx[1] + dx[2] * dx[2]) / */
/* (ci->h[0] * ci->h[0] + ci->h[1] * ci->h[1] + ci->h[2] *
* ci->h[2])); */
/* /\* Do an MM or an MP/PM? *\/ */
/* if (theta > const_theta_max * 4) { */
/* /\* Update the multipoles. *\/ */
/* multipole_iact_mm(&ci->multipole, &cj->multipole, shift); */
/* } else { */
/* /\* Interact the multipoles via their parts. *\/ */
/* for (k = 0; k < ci->gcount; k++) */
/* multipole_iact_mp(&cj->multipole, &ci->gparts[k], shift); */
/* for (k = 0; k < cj->gcount; k++) */
/* multipole_iact_mp(&ci->multipole, &cj->gparts[k], shift); */
/* } */
/* } */
/* /\** */
/* * @brief Compute the interactions between a cell pair. */
/* * */
/* * @param r The #runner. */
/* * @param ci The first #cell. */
/* * @param cj The second #cell. */
/* *\/ */
/* void runner_dopair_grav(struct runner *r, struct cell *restrict ci, */
/* struct cell *restrict cj) { */
/* struct engine *e = r->e; */
/* int pid, pjd, k, count_i = ci->gcount, count_j = cj->gcount; */
/* double shift[3] = {0.0, 0.0, 0.0}; */
/* struct gpart *restrict parts_i = ci->gparts, *restrict parts_j =
* cj->gparts; */
/* struct gpart *restrict pi, *restrict pj; */
/* double pix[3]; */
/* float dx[3], r2; */
/* const int ti_current = r->e->ti_current; */
/* #ifdef VECTORIZE */
/* int icount = 0; */
/* float r2q[VEC_SIZE] __attribute__((aligned(16))); */
/* float dxq[3 * VEC_SIZE] __attribute__((aligned(16))); */
/* struct gpart *piq[VEC_SIZE], *pjq[VEC_SIZE]; */
/* #endif */
/* TIMER_TIC */
/* /\* Anything to do here? *\/ */
/* if (ci->ti_end_min > ti_current && cj->ti_end_min > ti_current) return; */
/* /\* Get the relative distance between the pairs, wrapping. *\/ */
/* if (e->s->periodic) */
/* for (k = 0; k < 3; k++) { */
/* if (cj->loc[k] - ci->loc[k] < -e->s->dim[k] / 2) */
/* shift[k] = e->s->dim[k]; */
/* else if (cj->loc[k] - ci->loc[k] > e->s->dim[k] / 2) */
/* shift[k] = -e->s->dim[k]; */
/* } */
/* /\* Loop over the parts in ci. *\/ */
/* for (pid = 0; pid < count_i; pid++) { */
/* /\* Get a hold of the ith part in ci. *\/ */
/* pi = &parts_i[pid]; */
/* for (k = 0; k < 3; k++) pix[k] = pi->x[k] - shift[k]; */
/* /\* Loop over the parts in cj. *\/ */
/* for (pjd = 0; pjd < count_j; pjd++) { */
/* /\* Get a pointer to the jth particle. *\/ */
/* pj = &parts_j[pjd]; */
/* /\* Compute the pairwise distance. *\/ */
/* r2 = 0.0f; */
/* for (k = 0; k < 3; k++) { */
/* dx[k] = pix[k] - pj->x[k]; */
/* r2 += dx[k] * dx[k]; */
/* } */
/* /\* Compute the interaction. *\/ */
/* #ifndef VECTORIZE */
/* // if ( pi->part->id == 3473472412525 || pj->part->id == 3473472412525
* ) */
/* // message( "interacting particles pi=%lli and pj=%lli with r=%.3e
* in */
/* // cells %lli/%lli." , pi->part->id , pj->part->id , sqrtf(r2) , ((long
*/
/* // long int)ci) / sizeof(struct cell) , ((long long int)cj) / */
/* // sizeof(struct cell) ); */
/* runner_iact_grav(r2, dx, pi, pj); */
/* #else */
/* /\* Add this interaction to the queue. *\/ */
/* r2q[icount] = r2; */
/* dxq[3 * icount + 0] = dx[0]; */
/* dxq[3 * icount + 1] = dx[1]; */
/* dxq[3 * icount + 2] = dx[2]; */
/* piq[icount] = pi; */
/* pjq[icount] = pj; */
/* icount += 1; */
/* /\* Flush? *\/ */
/* if (icount == VEC_SIZE) { */
/* runner_iact_vec_grav(r2q, dxq, piq, pjq); */
/* icount = 0; */
/* } */
/* #endif */
/* } /\* loop over the parts in cj. *\/ */
/* } /\* loop over the parts in ci. *\/ */
/* #ifdef VECTORIZE */
/* /\* Pick up any leftovers. *\/ */
/* if (icount > 0) */
/* for (k = 0; k < icount; k++) */
/* runner_iact_grav(r2q[k], &dxq[3 * k], piq[k], pjq[k]); */
/* #endif */
/* TIMER_TOC(timer_dopair_grav); */
/* } */
/* /\** */
/* * @brief Compute the interactions within a cell. */
/* * */
/* * @param r The #runner. */
/* * @param c The #cell. */
/* *\/ */
/* void runner_doself_grav(struct runner *r, struct cell *restrict c) { */
/* int pid, pjd, k, count = c->gcount; */
/* struct gpart *restrict parts = c->gparts; */
/* struct gpart *restrict pi, *restrict pj; */
/* double pix[3] = {0.0, 0.0, 0.0}; */
/* float dx[3], r2; */
/* const int ti_current = r->e->ti_current; */
/* #ifdef VECTORIZE */
/* int icount = 0; */
/* float r2q[VEC_SIZE] __attribute__((aligned(16))); */
/* float dxq[3 * VEC_SIZE] __attribute__((aligned(16))); */
/* struct gpart *piq[VEC_SIZE], *pjq[VEC_SIZE]; */
/* #endif */
/* TIMER_TIC */
/* /\* Anything to do here? *\/ */
/* if (c->ti_end_min > ti_current) return; */
/* /\* Loop over every part in c. *\/ */
/* for (pid = 0; pid < count; pid++) { */
/* /\* Get a hold of the ith part in ci. *\/ */
/* pi = &parts[pid]; */
/* for (k = 0; k < 3; k++) pix[k] = pi->x[k]; */
/* /\* Loop over every other part in c. *\/ */
/* for (pjd = pid + 1; pjd < count; pjd++) { */
/* /\* Get a pointer to the jth particle. *\/ */
/* pj = &parts[pjd]; */
/* /\* Compute the pairwise distance. *\/ */
/* r2 = 0.0f; */
/* for (k = 0; k < 3; k++) { */
/* dx[k] = pix[k] - pj->x[k]; */
/* r2 += dx[k] * dx[k]; */
/* } */
/* /\* Compute the interaction. *\/ */
/* #ifndef VECTORIZE */
/* // if ( pi->part->id == 3473472412525 || pj->part->id == 3473472412525
* ) */
/* // message( "interacting particles pi=%lli and pj=%lli with
* r=%.3e." , */
/* // pi->part->id , pj->part->id , sqrtf(r2) ); */
/* runner_iact_grav(r2, dx, pi, pj); */
/* #else */
/* /\* Add this interaction to the queue. *\/ */
/* r2q[icount] = r2; */
/* dxq[3 * icount + 0] = dx[0]; */
/* dxq[3 * icount + 1] = dx[1]; */
/* dxq[3 * icount + 2] = dx[2]; */
/* piq[icount] = pi; */
/* pjq[icount] = pj; */
/* icount += 1; */
/* /\* Flush? *\/ */
/* if (icount == VEC_SIZE) { */
/* runner_iact_vec_grav(r2q, dxq, piq, pjq); */
/* icount = 0; */
/* } */
/* #endif */
/* } /\* loop over the remaining parts in c. *\/ */
/* } /\* loop over the parts in c. *\/ */
/* #ifdef VECTORIZE */
/* /\* Pick up any leftovers. *\/ */
/* if (icount > 0) */
/* for (k = 0; k < icount; k++) */
/* runner_iact_grav(r2q[k], &dxq[3 * k], piq[k], pjq[k]); */
/* #endif */
/* TIMER_TOC(timer_doself_grav); */
/* } */
/* /\** */
/* * @brief Compute a gravity sub-task. */
/* * */
/* * @param r The #runner. */
/* * @param ci The first #cell. */
/* * @param cj The second #cell. */
/* * @param gettimer Flag to record timer or not. */
/* *\/ */
/* void runner_dosub_grav(struct runner *r, struct cell *ci, struct cell *cj, */
/* int gettimer) { */
/* int j, k, periodic = r->e->s->periodic; */
/* struct space *s = r->e->s; */
/* TIMER_TIC */
/* /\* Self-interaction? *\/ */
/* if (cj == NULL) { */
/* /\* If the cell is split, recurse. *\/ */
/* if (ci->split) { */
/* /\* Split this task into tasks on its progeny. *\/ */
/* for (j = 0; j < 8; j++) */
/* if (ci->progeny[j] != NULL) { */
/* runner_dosub_grav(r, ci->progeny[j], NULL, 0); */
/* for (k = j + 1; k < 8; k++) */
/* if (ci->progeny[k] != NULL) */
/* runner_dosub_grav(r, ci->progeny[j], ci->progeny[k], 0); */
/* } */
/* } */
/* /\* Otherwise, just make a pp task out of it. *\/ */
/* else */
/* runner_doself_grav(r, ci); */
/* } */
/* /\* Nope, pair. *\/ */
/* else { */
/* /\* Get the opening angle theta. *\/ */
/* float dx[3], theta; */
/* for (k = 0; k < 3; k++) { */
/* dx[k] = fabs(ci->loc[k] - cj->loc[k]); */
/* if (periodic && dx[k] > 0.5 * s->dim[k]) dx[k] = -dx[k] + s->dim[k]; */
/* if (dx[k] > 0.0f) dx[k] -= ci->h[k]; */
/* } */
/* theta = (dx[0] * dx[0] + dx[1] * dx[1] + dx[2] * dx[2]) / */