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gravtree.c
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#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <float.h>
#include <mpi.h>
#include "allvars.h"
#include "proto.h"
/*! \file gravtree.c
* \brief main driver routines for gravitational (short-range) force computation
*
* This file contains the code for the gravitational force computation by
* means of the tree algorithm. To this end, a tree force is computed for
* all active local particles, and particles are exported to other
* processors if needed, where they can receive additional force
* contributions. If the TreePM algorithm is enabled, the force computed
* will only be the short-range part.
*/
/*! This function computes the gravitational forces for all active
* particles. If needed, a new tree is constructed, otherwise the
* dynamically updated tree is used. Particles are only exported to other
* processors when really needed, thereby allowing a good use of the
* communication buffer.
*/
void gravity_tree(void)
{
long long ntot;
int numnodes, nexportsum = 0;
int i, j, iter = 0;
int *numnodeslist, maxnumnodes, nexport, *numlist, *nrecv, *ndonelist;
double tstart, tend, timetree = 0, timecommsumm = 0, timeimbalance = 0, sumimbalance;
double ewaldcount;
double costtotal, ewaldtot, *costtreelist, *ewaldlist;
double maxt, sumt, *timetreelist, *timecommlist;
double fac, plb, plb_max, sumcomm;
#ifdef DETAILED_CPU_GRAVITY
double timetree1 = 0, timecommsumm1 = 0, timeimbalance1 = 0;
double timetree2 = 0, timecommsumm2 = 0, timeimbalance2 = 0;
double sumt1,sumt2;
double sumcomm1,sumcomm2;
double sumimbalance1,sumimbalance2;
#endif
#ifdef DETAILED_CPU_OUTPUT_IN_GRAVTREE
double *timetreelist1, *timecommlist1, *timeimbalancelist1;
double *timetreelist2, *timecommlist2, *timeimbalancelist2;
double *timeimbalancelist;
int *numpartlist;
#endif
#ifndef NOGRAVITY
int *noffset, *nbuffer, *nsend, *nsend_local;
long long ntotleft;
int ndone, maxfill, ngrp;
int k, place;
int level, sendTask, recvTask;
double ax, ay, az;
MPI_Status status;
#endif
/* set new softening lengths */
if(All.ComovingIntegrationOn)
set_softenings();
/* contruct tree if needed */
tstart = second();
if(TreeReconstructFlag)
{
if(ThisTask == 0)
printf("Tree construction.\n");
force_treebuild(NumPart);
TreeReconstructFlag = 0;
if(ThisTask == 0)
printf("Tree construction done.\n");
}
tend = second();
All.CPU_TreeConstruction += timediff(tstart, tend);
costtotal = ewaldcount = 0;
/* Note: 'NumForceUpdate' has already been determined in find_next_sync_point_and_drift() */
numlist = malloc(NTask * sizeof(int) * NTask);
MPI_Allgather(&NumForceUpdate, 1, MPI_INT, numlist, 1, MPI_INT, MPI_COMM_WORLD);
for(i = 0, ntot = 0; i < NTask; i++)
ntot += numlist[i];
free(numlist);
#ifndef NOGRAVITY
if(ThisTask == 0)
printf("Begin tree force.\n");
#ifdef SELECTIVE_NO_GRAVITY
for(i = 0; i < NumPart; i++)
if(((1 << P[i].Type) & (SELECTIVE_NO_GRAVITY)))
P[i].Ti_endstep = -P[i].Ti_endstep - 1;
#endif
noffset = malloc(sizeof(int) * NTask); /* offsets of bunches in common list */
nbuffer = malloc(sizeof(int) * NTask);
nsend_local = malloc(sizeof(int) * NTask);
nsend = malloc(sizeof(int) * NTask * NTask);
ndonelist = malloc(sizeof(int) * NTask);
i = 0; /* beginn with this index */
ntotleft = ntot; /* particles left for all tasks together */
while(ntotleft > 0)
{
iter++;
for(j = 0; j < NTask; j++)
nsend_local[j] = 0;
/* do local particles and prepare export list */
tstart = second();
for(nexport = 0, ndone = 0; i < NumPart && nexport < All.BunchSizeForce - NTask; i++)
if(P[i].Ti_endstep == All.Ti_Current)
{
ndone++;
for(j = 0; j < NTask; j++)
Exportflag[j] = 0;
#ifndef PMGRID
costtotal += force_treeevaluate(i, 0, &ewaldcount);
#else
costtotal += force_treeevaluate_shortrange(i, 0);
#endif
for(j = 0; j < NTask; j++)
{
if(Exportflag[j])
{
for(k = 0; k < 3; k++)
GravDataGet[nexport].u.Pos[k] = P[i].Pos[k];
#if defined(UNEQUALSOFTENINGS) || defined(STELLAR_FLUX)
GravDataGet[nexport].Type = P[i].Type;
#ifdef ADAPTIVE_GRAVSOFT_FORGAS
if(P[i].Type == 0)
GravDataGet[nexport].Soft = SphP[i].Hsml;
#endif
#endif
GravDataGet[nexport].w.OldAcc = P[i].OldAcc;
GravDataIndexTable[nexport].Task = j;
GravDataIndexTable[nexport].Index = i;
GravDataIndexTable[nexport].SortIndex = nexport;
nexport++;
nexportsum++;
nsend_local[j]++;
}
}
}
tend = second();
timetree += timediff(tstart, tend);
#ifdef DETAILED_CPU_GRAVITY
timetree1 += timediff(tstart, tend);
#endif
qsort(GravDataIndexTable, nexport, sizeof(struct gravdata_index), grav_tree_compare_key);
for(j = 0; j < nexport; j++)
GravDataIn[j] = GravDataGet[GravDataIndexTable[j].SortIndex];
for(j = 1, noffset[0] = 0; j < NTask; j++)
noffset[j] = noffset[j - 1] + nsend_local[j - 1];
tstart = second();
MPI_Allgather(nsend_local, NTask, MPI_INT, nsend, NTask, MPI_INT, MPI_COMM_WORLD);
tend = second();
timeimbalance += timediff(tstart, tend);
#ifdef DETAILED_CPU_GRAVITY
timeimbalance1 += timediff(tstart, tend);
#endif
/* now do the particles that need to be exported */
for(level = 1; level < (1 << PTask); level++)
{
tstart = second();
for(j = 0; j < NTask; j++)
nbuffer[j] = 0;
for(ngrp = level; ngrp < (1 << PTask); ngrp++)
{
maxfill = 0;
for(j = 0; j < NTask; j++)
{
if((j ^ ngrp) < NTask)
if(maxfill < nbuffer[j] + nsend[(j ^ ngrp) * NTask + j])
maxfill = nbuffer[j] + nsend[(j ^ ngrp) * NTask + j];
}
if(maxfill >= All.BunchSizeForce)
break;
sendTask = ThisTask;
recvTask = ThisTask ^ ngrp;
if(recvTask < NTask)
{
if(nsend[ThisTask * NTask + recvTask] > 0 || nsend[recvTask * NTask + ThisTask] > 0)
{
/* get the particles */
MPI_Sendrecv(&GravDataIn[noffset[recvTask]],
nsend_local[recvTask] * sizeof(struct gravdata_in), MPI_BYTE,
recvTask, TAG_GRAV_A,
&GravDataGet[nbuffer[ThisTask]],
nsend[recvTask * NTask + ThisTask] * sizeof(struct gravdata_in), MPI_BYTE,
recvTask, TAG_GRAV_A, MPI_COMM_WORLD, &status);
}
}
for(j = 0; j < NTask; j++)
if((j ^ ngrp) < NTask)
nbuffer[j] += nsend[(j ^ ngrp) * NTask + j];
}
tend = second();
timecommsumm += timediff(tstart, tend);
#ifdef DETAILED_CPU_GRAVITY
timecommsumm1 += timediff(tstart, tend);
#endif
tstart = second();
for(j = 0; j < nbuffer[ThisTask]; j++)
{
#ifndef PMGRID
costtotal += force_treeevaluate(j, 1, &ewaldcount);
#else
costtotal += force_treeevaluate_shortrange(j, 1);
#endif
}
tend = second();
timetree += timediff(tstart, tend);
#ifdef DETAILED_CPU_GRAVITY
timetree2 += timediff(tstart, tend);
#endif
tstart = second();
MPI_Barrier(MPI_COMM_WORLD);
tend = second();
timeimbalance += timediff(tstart, tend);
#ifdef DETAILED_CPU_GRAVITY
timeimbalance2 += timediff(tstart, tend);
#endif
/* get the result */
tstart = second();
for(j = 0; j < NTask; j++)
nbuffer[j] = 0;
for(ngrp = level; ngrp < (1 << PTask); ngrp++)
{
maxfill = 0;
for(j = 0; j < NTask; j++)
{
if((j ^ ngrp) < NTask)
if(maxfill < nbuffer[j] + nsend[(j ^ ngrp) * NTask + j])
maxfill = nbuffer[j] + nsend[(j ^ ngrp) * NTask + j];
}
if(maxfill >= All.BunchSizeForce)
break;
sendTask = ThisTask;
recvTask = ThisTask ^ ngrp;
if(recvTask < NTask)
{
if(nsend[ThisTask * NTask + recvTask] > 0 || nsend[recvTask * NTask + ThisTask] > 0)
{
/* send the results */
MPI_Sendrecv(&GravDataResult[nbuffer[ThisTask]],
nsend[recvTask * NTask + ThisTask] * sizeof(struct gravdata_in),
MPI_BYTE, recvTask, TAG_GRAV_B,
&GravDataOut[noffset[recvTask]],
nsend_local[recvTask] * sizeof(struct gravdata_in),
MPI_BYTE, recvTask, TAG_GRAV_B, MPI_COMM_WORLD, &status);
/* add the result to the particles */
for(j = 0; j < nsend_local[recvTask]; j++)
{
place = GravDataIndexTable[noffset[recvTask] + j].Index;
for(k = 0; k < 3; k++)
P[place].GravAccel[k] += GravDataOut[j + noffset[recvTask]].u.Acc[k];
P[place].GravCost += GravDataOut[j + noffset[recvTask]].w.Ninteractions;
#ifdef STELLAR_FLUX
if (P[place].Type==0) /* only for gas */
SphP[place].EnergyFlux += GravDataOut[j + noffset[recvTask]].EnergyFlux;
#endif
}
}
}
for(j = 0; j < NTask; j++)
if((j ^ ngrp) < NTask)
nbuffer[j] += nsend[(j ^ ngrp) * NTask + j];
}
tend = second();
timecommsumm += timediff(tstart, tend);
#ifdef DETAILED_CPU_GRAVITY
timecommsumm2 += timediff(tstart, tend);
#endif
level = ngrp - 1;
}
MPI_Allgather(&ndone, 1, MPI_INT, ndonelist, 1, MPI_INT, MPI_COMM_WORLD);
for(j = 0; j < NTask; j++)
ntotleft -= ndonelist[j];
}
free(ndonelist);
free(nsend);
free(nsend_local);
free(nbuffer);
free(noffset);
/* now add things for comoving integration */
/* yr: with vacuum boundary conditions */
#ifndef PERIODIC
#ifndef PMGRID
if(All.ComovingIntegrationOn)
{
fac = 0.5 * All.Hubble * All.Hubble * All.Omega0 / All.G;
for(i = 0; i < NumPart; i++)
if(P[i].Ti_endstep == All.Ti_Current)
for(j = 0; j < 3; j++)
P[i].GravAccel[j] += fac * P[i].Pos[j];
}
#endif
#endif
for(i = 0; i < NumPart; i++)
if(P[i].Ti_endstep == All.Ti_Current)
{
#ifdef PMGRID
ax = P[i].GravAccel[0] + P[i].GravPM[0] / All.G;
ay = P[i].GravAccel[1] + P[i].GravPM[1] / All.G;
az = P[i].GravAccel[2] + P[i].GravPM[2] / All.G;
#else
ax = P[i].GravAccel[0];
ay = P[i].GravAccel[1];
az = P[i].GravAccel[2];
#endif
P[i].OldAcc = sqrt(ax * ax + ay * ay + az * az);
}
if(All.TypeOfOpeningCriterion == 1)
All.ErrTolTheta = 0; /* This will switch to the relative opening criterion for the following force computations */
/* muliply by G */
for(i = 0; i < NumPart; i++)
if(P[i].Ti_endstep == All.Ti_Current)
for(j = 0; j < 3; j++)
P[i].GravAccel[j] *= All.G;
/* Finally, the following factor allows a computation of a cosmological simulation
with vacuum energy in physical coordinates */
#ifndef PERIODIC
#ifndef PMGRID
#ifndef FORCE_OMEGALAMBDA_TO_0
if(All.ComovingIntegrationOn == 0)
{
fac = All.OmegaLambda * All.Hubble * All.Hubble;
for(i = 0; i < NumPart; i++)
if(P[i].Ti_endstep == All.Ti_Current)
for(j = 0; j < 3; j++)
P[i].GravAccel[j] += fac * P[i].Pos[j];
}
#endif
#endif
#endif
#ifdef SELECTIVE_NO_GRAVITY
for(i = 0; i < NumPart; i++)
if(P[i].Ti_endstep < 0)
P[i].Ti_endstep = -P[i].Ti_endstep - 1;
#endif
if(ThisTask == 0)
printf("tree is done.\n");
#else /* gravity is switched off */
for(i = 0; i < NumPart; i++)
if(P[i].Ti_endstep == All.Ti_Current)
for(j = 0; j < 3; j++)
P[i].GravAccel[j] = 0;
#endif
#ifdef OUTERPOTENTIAL
/* Add outer forces from an outer potential */
outer_forces();
#endif
#ifdef PERIODICOUTER
update_traceacc();
update_rotang();
fictitious_forces();
#endif
/* Now the force computation is finished */
/* gather some diagnostic information */
timetreelist = malloc(sizeof(double) * NTask);
timecommlist = malloc(sizeof(double) * NTask);
costtreelist = malloc(sizeof(double) * NTask);
numnodeslist = malloc(sizeof(int) * NTask);
ewaldlist = malloc(sizeof(double) * NTask);
nrecv = malloc(sizeof(int) * NTask);
#ifdef DETAILED_CPU_OUTPUT_IN_GRAVTREE
timeimbalancelist = malloc(sizeof(double) * NTask);
numpartlist = malloc(sizeof(int) * NTask);
timetreelist1 = malloc(sizeof(double) * NTask);
timecommlist1 = malloc(sizeof(double) * NTask);
timeimbalancelist1 = malloc(sizeof(double) * NTask);
timetreelist2 = malloc(sizeof(double) * NTask);
timecommlist2 = malloc(sizeof(double) * NTask);
timeimbalancelist2 = malloc(sizeof(double) * NTask);
#endif
numnodes = Numnodestree;
MPI_Gather(&costtotal, 1, MPI_DOUBLE, costtreelist, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&numnodes, 1, MPI_INT, numnodeslist, 1, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Gather(&timetree, 1, MPI_DOUBLE, timetreelist, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&timecommsumm, 1, MPI_DOUBLE, timecommlist, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&NumPart, 1, MPI_INT, nrecv, 1, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Gather(&ewaldcount, 1, MPI_DOUBLE, ewaldlist, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Reduce(&nexportsum, &nexport, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&timeimbalance, &sumimbalance, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
#ifdef DETAILED_CPU_GRAVITY
MPI_Reduce(&timetree1, &sumt1, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&timetree2, &sumt2, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&timeimbalance1, &sumimbalance1, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&timeimbalance2, &sumimbalance2, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&timecommsumm1, &sumcomm1, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&timecommsumm2, &sumcomm2, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
#endif
#ifdef DETAILED_CPU_OUTPUT_IN_GRAVTREE
MPI_Gather(&timeimbalance, 1, MPI_DOUBLE, timeimbalancelist, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&NumForceUpdate, 1, MPI_INT, numpartlist, 1, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Gather(&timetree1, 1, MPI_DOUBLE, timetreelist1, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&timetree2, 1, MPI_DOUBLE, timetreelist2, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&timecommsumm1, 1, MPI_DOUBLE, timecommlist1, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&timecommsumm2, 1, MPI_DOUBLE, timecommlist2, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&timeimbalance1, 1, MPI_DOUBLE, timeimbalancelist1, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
MPI_Gather(&timeimbalance2, 1, MPI_DOUBLE, timeimbalancelist2, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
#endif
#ifdef SPLIT_DOMAIN_USING_TIME
CPU_Gravity = timetree1;
#endif
#ifndef PY_INTERFACE
if(ThisTask == 0)
{
All.TotNumOfForces += ntot;
fprintf(FdTimings, "Step= %d t= %g dt= %g \n", All.NumCurrentTiStep, All.Time, All.TimeStep);
fprintf(FdTimings, "Nf= %d%09d total-Nf= %d%09d ex-frac= %g iter= %d\n",
(int) (ntot / 1000000000), (int) (ntot % 1000000000),
(int) (All.TotNumOfForces / 1000000000), (int) (All.TotNumOfForces % 1000000000),
nexport / ((double) ntot), iter);
/* note: on Linux, the 8-byte integer could be printed with the format identifier "%qd", but doesn't work on AIX */
fac = NTask / ((double) All.TotNumPart);
for(i = 0, maxt = timetreelist[0], sumt = 0, plb_max = 0,
maxnumnodes = 0, costtotal = 0, sumcomm = 0, ewaldtot = 0; i < NTask; i++)
{
costtotal += costtreelist[i];
sumcomm += timecommlist[i];
if(maxt < timetreelist[i])
maxt = timetreelist[i];
sumt += timetreelist[i];
plb = nrecv[i] * fac;
if(plb > plb_max)
plb_max = plb;
if(numnodeslist[i] > maxnumnodes)
maxnumnodes = numnodeslist[i];
ewaldtot += ewaldlist[i];
}
fprintf(FdTimings, "work-load balance: %g max=%g avg=%g PE0=%g\n",
maxt / (sumt / NTask), maxt, sumt / NTask, timetreelist[0]);
fprintf(FdTimings, "particle-load balance: %g\n", plb_max);
fprintf(FdTimings, "max. nodes: %d, filled: %g\n", maxnumnodes,
maxnumnodes / (All.TreeAllocFactor * All.MaxPart));
fprintf(FdTimings, "part/sec=%g | %g ia/part=%g (%g)\n", ntot / (sumt + 1.0e-20),
ntot / (maxt * NTask), ((double) (costtotal)) / ntot, ((double) ewaldtot) / ntot);
#ifdef DETAILED_CPU_OUTPUT_IN_GRAVTREE
fprintf(FdTimings, "\n gravtree\n\n");
fprintf(FdTimings, "Nupdate ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12d ",numpartlist[i]); /* nombre de part par proc */
fprintf(FdTimings, "\n");
fprintf(FdTimings, "costtree ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",costtreelist[i]); /* nombre d'interactions */
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timetree ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timetreelist[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timeimbalance ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timeimbalancelist[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timecomm ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timecommlist[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timetree1 ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timetreelist1[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timetree2 ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timetreelist2[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timeimbalance1 ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timeimbalancelist1[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timeimbalance2 ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timeimbalancelist2[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timecomm1 ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timecommlist1[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "timecomm2 ");
for (i=0;i<NTask;i++)
fprintf(FdTimings, "%12g ",timecommlist2[i]);
fprintf(FdTimings, "\n");
fprintf(FdTimings, "\n");
#endif
fprintf(FdTimings, "\n");
fflush(FdTimings);
All.CPU_TreeWalk += sumt / NTask;
All.CPU_Imbalance += sumimbalance / NTask;
All.CPU_CommSum += sumcomm / NTask;
#ifdef DETAILED_CPU_GRAVITY
All.CPU_Gravity_TreeWalk1 += sumt1 / NTask;
All.CPU_Gravity_Imbalance1 += sumimbalance1 / NTask;
All.CPU_Gravity_CommSum1 += sumcomm1 / NTask;
All.CPU_Gravity_TreeWalk2 += sumt2 / NTask;
All.CPU_Gravity_Imbalance2 += sumimbalance2 / NTask;
All.CPU_Gravity_CommSum2 += sumcomm2 / NTask;
#endif
}
#endif /*ndef PY_INTERFACE*/
#ifdef DETAILED_CPU_OUTPUT_IN_GRAVTREE
free(timeimbalancelist2);
free(timecommlist2);
free(timetreelist2);
free(timeimbalancelist1);
free(timecommlist1);
free(timetreelist1);
free(numpartlist);
free(timeimbalancelist);
#endif
free(nrecv);
free(ewaldlist);
free(numnodeslist);
free(costtreelist);
free(timecommlist);
free(timetreelist);
}
/*! This function sets the (comoving) softening length of all particle
* types in the table All.SofteningTable[...]. We check that the physical
* softening length is bounded by the Softening-MaxPhys values.
*/
void set_softenings(void)
{
int i;
if(All.ComovingIntegrationOn)
{
if(All.SofteningGas * All.Time > All.SofteningGasMaxPhys)
All.SofteningTable[0] = All.SofteningGasMaxPhys / All.Time;
else
All.SofteningTable[0] = All.SofteningGas;
if(All.SofteningHalo * All.Time > All.SofteningHaloMaxPhys)
All.SofteningTable[1] = All.SofteningHaloMaxPhys / All.Time;
else
All.SofteningTable[1] = All.SofteningHalo;
if(All.SofteningDisk * All.Time > All.SofteningDiskMaxPhys)
All.SofteningTable[2] = All.SofteningDiskMaxPhys / All.Time;
else
All.SofteningTable[2] = All.SofteningDisk;
if(All.SofteningBulge * All.Time > All.SofteningBulgeMaxPhys)
All.SofteningTable[3] = All.SofteningBulgeMaxPhys / All.Time;
else
All.SofteningTable[3] = All.SofteningBulge;
if(All.SofteningStars * All.Time > All.SofteningStarsMaxPhys)
All.SofteningTable[4] = All.SofteningStarsMaxPhys / All.Time;
else
All.SofteningTable[4] = All.SofteningStars;
if(All.SofteningBndry * All.Time > All.SofteningBndryMaxPhys)
All.SofteningTable[5] = All.SofteningBndryMaxPhys / All.Time;
else
All.SofteningTable[5] = All.SofteningBndry;
}
else
{
All.SofteningTable[0] = All.SofteningGas;
All.SofteningTable[1] = All.SofteningHalo;
All.SofteningTable[2] = All.SofteningDisk;
All.SofteningTable[3] = All.SofteningBulge;
All.SofteningTable[4] = All.SofteningStars;
All.SofteningTable[5] = All.SofteningBndry;
}
for(i = 0; i < 6; i++)
All.ForceSoftening[i] = 2.8 * All.SofteningTable[i];
All.MinGasHsml = All.MinGasHsmlFractional * All.ForceSoftening[0];
}
/*! This function is used as a comparison kernel in a sort routine. It is
* used to group particles in the communication buffer that are going to
* be sent to the same CPU.
*/
int grav_tree_compare_key(const void *a, const void *b)
{
if(((struct gravdata_index *) a)->Task < (((struct gravdata_index *) b)->Task))
return -1;
if(((struct gravdata_index *) a)->Task > (((struct gravdata_index *) b)->Task))
return +1;
return 0;
}
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