space.c 38.3 KB
Newer Older
Pedro Gonnet's avatar
Pedro Gonnet committed
1
/*******************************************************************************
2
 * This file is part of SWIFT.
Pedro Gonnet's avatar
Pedro Gonnet committed
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 * Coypright (c) 2012 Pedro Gonnet (pedro.gonnet@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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <float.h>
#include <limits.h>
#include <math.h>
31
#include <omp.h>
Pedro Gonnet's avatar
Pedro Gonnet committed
32

33
34
35
36
37
/* MPI headers. */
#ifdef WITH_MPI
    #include <mpi.h>
#endif

Pedro Gonnet's avatar
Pedro Gonnet committed
38
/* Local headers. */
39
#include "const.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
40
#include "cycle.h"
41
#include "atomic.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
42
#include "lock.h"
43
#include "task.h"
44
#include "kernel.h"
45
#include "part.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
46
#include "space.h"
47
#include "multipole.h"
48
49
50
#include "cell.h"
#include "scheduler.h"
#include "engine.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
51
#include "runner.h"
52
#include "error.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
53
54
55

/* Split size. */
int space_splitsize = space_splitsize_default;
56
int space_subsize = space_subsize_default;
57
int space_maxsize = space_maxsize_default;
Pedro Gonnet's avatar
Pedro Gonnet committed
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88

/* Map shift vector to sortlist. */
const int sortlistID[27] = {
    /* ( -1 , -1 , -1 ) */   0 ,
    /* ( -1 , -1 ,  0 ) */   1 , 
    /* ( -1 , -1 ,  1 ) */   2 ,
    /* ( -1 ,  0 , -1 ) */   3 ,
    /* ( -1 ,  0 ,  0 ) */   4 , 
    /* ( -1 ,  0 ,  1 ) */   5 ,
    /* ( -1 ,  1 , -1 ) */   6 ,
    /* ( -1 ,  1 ,  0 ) */   7 , 
    /* ( -1 ,  1 ,  1 ) */   8 ,
    /* (  0 , -1 , -1 ) */   9 ,
    /* (  0 , -1 ,  0 ) */   10 , 
    /* (  0 , -1 ,  1 ) */   11 ,
    /* (  0 ,  0 , -1 ) */   12 ,
    /* (  0 ,  0 ,  0 ) */   0 , 
    /* (  0 ,  0 ,  1 ) */   12 ,
    /* (  0 ,  1 , -1 ) */   11 ,
    /* (  0 ,  1 ,  0 ) */   10 , 
    /* (  0 ,  1 ,  1 ) */   9 ,
    /* (  1 , -1 , -1 ) */   8 ,
    /* (  1 , -1 ,  0 ) */   7 , 
    /* (  1 , -1 ,  1 ) */   6 ,
    /* (  1 ,  0 , -1 ) */   5 ,
    /* (  1 ,  0 ,  0 ) */   4 , 
    /* (  1 ,  0 ,  1 ) */   3 ,
    /* (  1 ,  1 , -1 ) */   2 ,
    /* (  1 ,  1 ,  0 ) */   1 , 
    /* (  1 ,  1 ,  1 ) */   0 
    };
89
90
    
    
91
92
93
94
95
96
97
98
99
100
101
102
103
104
/**
 * @brief Get the shift-id of the given pair of cells, swapping them
 *      if need be.
 *
 * @param s The space
 * @param ci Pointer to first #cell.
 * @param cj Pointer second #cell.
 * @param shift Vector from ci to cj.
 *
 * @return The shift ID and set shift, may or may not swap ci and cj.
 */
 
int space_getsid ( struct space *s , struct cell **ci , struct cell **cj , double *shift ) {

105
    int k, sid = 0, periodic = s->periodic;
106
107
108
109
110
111
    struct cell *temp;
    double dx[3];

    /* Get the relative distance between the pairs, wrapping. */
    for ( k = 0 ; k < 3 ; k++ ) {
        dx[k] = (*cj)->loc[k] - (*ci)->loc[k];
112
        if ( periodic && dx[k] < -s->dim[k]/2 )
113
            shift[k] = s->dim[k];
114
        else if ( periodic && dx[k] > s->dim[k]/2 )
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
            shift[k] = -s->dim[k];
        else
            shift[k] = 0.0;
        dx[k] += shift[k];
        }
        
    /* Get the sorting index. */
    for ( k = 0 ; k < 3 ; k++ )
        sid = 3*sid + ( (dx[k] < 0.0) ? 0 : ( (dx[k] > 0.0) ? 2 : 1 ) );

    /* Switch the cells around? */
    if ( runner_flip[sid] ) {
        temp = *ci; *ci = *cj; *cj = temp;
        for ( k = 0 ; k < 3 ; k++ )
            shift[k] = -shift[k];
        }
    sid = sortlistID[sid];
    
    /* Return the sort ID. */
    return sid;

    }


139
/**
140
 * @brief Recursively dismantle a cell tree.
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
 *
 */
 
void space_rebuild_recycle ( struct space *s , struct cell *c ) {
    
    int k;
    
    if ( c->split )
        for ( k = 0 ; k < 8 ; k++ )
            if ( c->progeny[k] != NULL ) {
                space_rebuild_recycle( s , c->progeny[k] );
                space_recycle( s , c->progeny[k] );
                c->progeny[k] = NULL;
                }
    
    }
157
158
    
    
159
/**
160
 * @brief Re-build the cell grid.
161
 *
162
163
 * @param s The #space.
 * @param cell_max Maximum cell edge length.
164
165
 */
 
166
void space_regrid ( struct space *s , double cell_max ) {
167

168
    float h_max = s->cell_min / kernel_gamma / space_stretch, dmin;
169
    int i, j, k, cdim[3], nr_parts = s->nr_parts;
170
    struct cell *restrict c;
171
    // ticks tic;
172
173
    
    /* Run through the parts and get the current h_max. */
174
    // tic = getticks();
175
176
177
178
179
180
181
182
183
184
185
186
    if ( s->cells != NULL ) {
        for ( k = 0 ; k < s->nr_cells ; k++ ) {
            if ( s->cells[k].h_max > h_max )
                h_max = s->cells[k].h_max;
            }
        }
    else {
        for ( k = 0 ; k < nr_parts ; k++ ) {
            if ( s->parts[k].h > h_max )
                h_max = s->parts[k].h;
            }
        s->h_max = h_max;
187
        }
188
189
    // message( "h_max is %.3e (cell_max=%.3e)." , h_max , cell_max );
    // message( "getting h_min and h_max took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );
190
191
192
    
    /* Get the new putative cell dimensions. */
    for ( k = 0 ; k < 3 ; k++ )
193
        cdim[k] = floor( s->dim[k] / fmax( h_max*kernel_gamma*space_stretch , cell_max ) );
194
        
195
196
197
198
    /* Check if we have enough cells for periodicity. */
    if ( s->periodic && (cdim[0] < 3 || cdim[1] < 3 || cdim[2] < 3) )
        error( "Must have at least 3 cells in each spatial dimension when periodicity is switched on." );
        
199
200
201
202
203
204
    /* In MPI-Land, we're not allowed to change the top-level cell size. */
    #ifdef WITH_MPI
        if ( cdim[0] < s->cdim[0] || cdim[1] < s->cdim[1] || cdim[2] < s->cdim[2] )
            error( "Root-level change of cell size not allowed." );
    #endif
        
205
    /* Do we need to re-build the upper-level cells? */
206
    // tic = getticks();
Pedro Gonnet's avatar
Pedro Gonnet committed
207
    if ( s->cells == NULL ||
208
         cdim[0] < s->cdim[0] || cdim[1] < s->cdim[1] || cdim[2] < s->cdim[2] ) {
209
210
211
    
        /* Free the old cells, if they were allocated. */
        if ( s->cells != NULL ) {
212
            for ( k = 0 ; k < s->nr_cells ; k++ ) {
213
                space_rebuild_recycle( s , &s->cells[k] );
214
215
216
                if ( s->cells[k].sort != NULL )
                    free( s->cells[k].sort );
                }
217
218
219
220
            free( s->cells );
            s->maxdepth = 0;
            }
            
221
        /* Set the new cell dimensions only if smaller. */
222
223
224
225
226
        for ( k = 0 ; k < 3 ; k++ ) {
            s->cdim[k] = cdim[k];
            s->h[k] = s->dim[k] / cdim[k];
            s->ih[k] = 1.0 / s->h[k];
            }
227
        dmin = fminf( s->h[0] , fminf( s->h[1] , s->h[2] ) );
228

229
        /* Allocate the highest level of cells. */
Pedro Gonnet's avatar
Pedro Gonnet committed
230
        s->tot_cells = s->nr_cells = cdim[0] * cdim[1] * cdim[2];
231
232
233
234
235
236
237
238
239
240
241
242
243
244
        if ( posix_memalign( (void *)&s->cells , 64 , s->nr_cells * sizeof(struct cell) ) != 0 )
            error( "Failed to allocate cells." );
        bzero( s->cells , s->nr_cells * sizeof(struct cell) );
        for ( k = 0 ; k < s->nr_cells ; k++ )
            if ( lock_init( &s->cells[k].lock ) != 0 )
                error( "Failed to init spinlock." );

        /* Set the cell location and sizes. */
        for ( i = 0 ; i < cdim[0] ; i++ )
            for ( j = 0 ; j < cdim[1] ; j++ )
                for ( k = 0 ; k < cdim[2] ; k++ ) {
                    c = &s->cells[ cell_getid( cdim , i , j , k ) ];
                    c->loc[0] = i*s->h[0]; c->loc[1] = j*s->h[1]; c->loc[2] = k*s->h[2];
                    c->h[0] = s->h[0]; c->h[1] = s->h[1]; c->h[2] = s->h[2];
245
                    c->dmin = dmin;
246
                    c->depth = 0;
Pedro Gonnet's avatar
Pedro Gonnet committed
247
                    c->count = 0;
248
                    c->gcount = 0;
249
                    c->super = c;
250
                    lock_init( &c->lock );
251
                    }
252
253
           
        /* Be verbose about the change. */         
254
        message( "set cell dimensions to [ %i %i %i ]." , cdim[0] , cdim[1] , cdim[2] ); fflush(stdout);
255
256
                    
        } /* re-build upper-level cells? */
257
    // message( "rebuilding upper-level cells took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );
258
        
Pedro Gonnet's avatar
Pedro Gonnet committed
259
260
261
262
263
264
265
266
267
    /* Otherwise, just clean up the cells. */
    else {
    
        /* Free the old cells, if they were allocated. */
        for ( k = 0 ; k < s->nr_cells ; k++ ) {
            space_rebuild_recycle( s , &s->cells[k] );
            s->cells[k].sorts = NULL;
            s->cells[k].nr_tasks = 0;
            s->cells[k].nr_density = 0;
268
            s->cells[k].nr_force = 0;
269
270
            s->cells[k].density = NULL;
            s->cells[k].force = NULL;
Pedro Gonnet's avatar
Pedro Gonnet committed
271
            s->cells[k].dx_max = 0.0f;
272
            s->cells[k].sorted = 0;
Pedro Gonnet's avatar
Pedro Gonnet committed
273
            s->cells[k].count = 0;
274
            s->cells[k].gcount = 0;
275
            s->cells[k].kick1 = NULL;
Pedro Gonnet's avatar
Pedro Gonnet committed
276
            s->cells[k].kick2 = NULL;
277
            s->cells[k].super = &s->cells[k];
Pedro Gonnet's avatar
Pedro Gonnet committed
278
279
280
281
            }
        s->maxdepth = 0;
    
        }
282
        
283
284
285
286
287
288
289
290
291
292
293
294
295
    }
    

/**
 * @brief Re-build the cells as well as the tasks.
 *
 * @param s The #space in which to update the cells.
 * @param cell_max Maximal cell size.
 *
 */
 
void space_rebuild ( struct space *s , double cell_max ) {

296
    int j, k, cdim[3], nr_parts = s->nr_parts, nr_gparts = s->nr_gparts;
297
    struct cell *restrict c, *restrict cells;
298
299
    struct part *restrict finger, *restrict p, *parts = s->parts;
    struct xpart *xfinger, *xparts = s->xparts;
300
    struct gpart *gp, *gparts = s->gparts, *gfinger;
301
302
303
304
305
306
307
    int *ind;
    double ih[3], dim[3];
    // ticks tic;
    
    /* Be verbose about this. */
    // message( "re)building space..." ); fflush(stdout);
    
308
309
    /* Re-grid if necessary, or just re-set the cell data. */
    space_regrid( s , cell_max );
310
    cells = s->cells;
311
        
312
    /* Run through the particles and get their cell index. */
313
    // tic = getticks();
314
    if ( ( ind = (int *)malloc( sizeof(int) * s->size_parts ) ) == NULL )
315
        error( "Failed to allocate temporary particle indices." );
Pedro Gonnet's avatar
Pedro Gonnet committed
316
317
    ih[0] = s->ih[0]; ih[1] = s->ih[1]; ih[2] = s->ih[2];
    dim[0] = s->dim[0]; dim[1] = s->dim[1]; dim[2] = s->dim[2];
Pedro Gonnet's avatar
Pedro Gonnet committed
318
    cdim[0] = s->cdim[0]; cdim[1] = s->cdim[1]; cdim[2] = s->cdim[2];
319
    #pragma omp parallel for private(p,j)
320
321
    for ( k = 0 ; k < nr_parts ; k++ )  {
        p = &parts[k];
322
323
        for ( j = 0 ; j < 3 ; j++ )
            if ( p->x[j] < 0.0 )
Pedro Gonnet's avatar
Pedro Gonnet committed
324
325
326
327
                p->x[j] += dim[j];
            else if ( p->x[j] >= dim[j] )
                p->x[j] -= dim[j];
        ind[k] = cell_getid( cdim , p->x[0]*ih[0] , p->x[1]*ih[1] , p->x[2]*ih[2] );
328
        atomic_inc( &cells[ ind[k] ].count );
329
        }
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
    // message( "getting particle indices took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );


    /* Move non-local parts to the end of the list. */
    #ifdef WITH_MPI
        int nodeID = s->e->nodeID;
        for ( k = 0 ; k < nr_parts ; k++ )
            if ( cells[ ind[k] ].nodeID != nodeID ) {
                cells[ ind[k] ].count -= 1;
                nr_parts -= 1;
                struct part tp = parts[k];
                parts[k] = parts[ nr_parts ];
                parts[ nr_parts ] = tp;
                struct xpart txp = xparts[k];
                xparts[k] = xparts[ nr_parts ];
                xparts[ nr_parts ] = txp;
                int t = ind[k];
                ind[k] = ind[ nr_parts ];
                ind[ nr_parts ] = t;
                }
        s->nr_parts = nr_parts + engine_exchange_strays( s->e , &parts[nr_parts] , &xparts[nr_parts] , &ind[nr_parts] , s->nr_parts - nr_parts );
        for ( k = nr_parts ; k < s->nr_parts ; k++ ) {
            p = &parts[k];
            ind[k] = cell_getid( cdim , p->x[0]*ih[0] , p->x[1]*ih[1] , p->x[2]*ih[2] );
            cells[ ind[k] ].count += 1;
355
356
            /* if ( cells[ ind[k] ].nodeID != nodeID )
                error( "Received part that does not belong to me (nodeID=%i)." , cells[ ind[k] ].nodeID ); */
357
358
359
360
            }
        nr_parts = s->nr_parts;
    #endif
    
361
362

    /* Sort the parts according to their cells. */
363
    // tic = getticks();
364
365
    parts_sort( parts , xparts , ind , nr_parts , 0 , s->nr_cells-1 );
    // message( "parts_sort took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );
366
    
367
368
369
370
371
    /* Re-link the gparts. */
    for ( k = 0 ; k < nr_parts ; k++ )
        if ( parts[k].gpart != NULL )
            parts[k].gpart->part = &parts[k];
    
Pedro Gonnet's avatar
Pedro Gonnet committed
372
373
374
375
376
377
378
379
380
    /* Verify sort. */
    /* for ( k = 1 ; k < nr_parts ; k++ ) {
        if ( ind[k-1] > ind[k] ) {
            error( "Sort failed!" );
            }
        else if ( ind[k] != cell_getid( cdim , parts[k].x[0]*ih[0] , parts[k].x[1]*ih[1] , parts[k].x[2]*ih[2] ) )
            error( "Incorrect indices!" );
        } */
    
381
382
    /* We no longer need the indices as of here. */
    free( ind );    
383

384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406


    /* Run through the gravity particles and get their cell index. */
    // tic = getticks();
    if ( ( ind = (int *)malloc( sizeof(int) * s->size_gparts ) ) == NULL )
        error( "Failed to allocate temporary particle indices." );
    #pragma omp parallel for private(gp,j)
    for ( k = 0 ; k < nr_gparts ; k++ )  {
        gp = &gparts[k];
        for ( j = 0 ; j < 3 ; j++ )
            if ( gp->x[j] < 0.0 )
                gp->x[j] += dim[j];
            else if ( gp->x[j] >= dim[j] )
                gp->x[j] -= dim[j];
        ind[k] = cell_getid( cdim , gp->x[0]*ih[0] , gp->x[1]*ih[1] , gp->x[2]*ih[2] );
        atomic_inc( &cells[ ind[k] ].gcount );
        }
    // message( "getting particle indices took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );

    /* TODO: Here we should exchange the gparts as well! */

    /* Sort the parts according to their cells. */
    // tic = getticks();
407
    gparts_sort( gparts ,ind , nr_gparts , 0 , s->nr_cells-1 );
408
409
410
411
412
413
414
415
416
417
418
419
    // message( "gparts_sort took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );
    
    /* Re-link the parts. */
    for ( k = 0 ; k < nr_gparts ; k++ )
        if ( gparts[k].id > 0 )
            gparts[k].part->gpart = &gparts[k];

    /* We no longer need the indices as of here. */
    free( ind );    



420
    /* Hook the cells up to the parts. */
421
    // tic = getticks();
422
423
    finger = parts;
    xfinger = xparts;
424
    gfinger = gparts;
425
    for ( k = 0 ; k < s->nr_cells ; k++ ) {
426
        c = &cells[ k ];
427
        c->parts = finger;
428
        c->xparts = xfinger;
429
        c->gparts = gfinger;
430
        finger = &finger[ c->count ];
431
        xfinger = &xfinger[ c->count ];
432
        gfinger = &gfinger[ c->gcount ];
433
        }
434
    // message( "hooking up cells took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );
435
        
436
437
    /* At this point, we have the upper-level cells, old or new. Now make
       sure that the parts in each cell are ok. */
438
    // tic = getticks();
Pedro Gonnet's avatar
Pedro Gonnet committed
439
    k = 0;
440
    #pragma omp parallel shared(s,k)
Pedro Gonnet's avatar
Pedro Gonnet committed
441
    {
442
443
444
445
        if ( omp_get_thread_num() < 8 )
            while ( 1 ) {
                int myk = atomic_inc( &k );
                if ( myk < s->nr_cells )
446
                    space_split( s , &cells[myk] );
447
448
449
                else
                    break;
                }
Pedro Gonnet's avatar
Pedro Gonnet committed
450
        }
451
452
    // message( "space_split took %.3f ms." , (double)(getticks() - tic) / CPU_TPS * 1000 );
    
453
454
455
    }


456
/**
457
 * @brief Sort the particles and condensed particles according to the given indices.
458
459
460
461
462
463
464
465
 *
 * @param parts The list of #part
 * @param ind The indices with respect to which the parts are sorted.
 * @param N The number of parts
 * @param min Lowest index.
 * @param max highest index.
 */
 
466
void parts_sort ( struct part *parts , struct xpart *xparts , int *ind , int N , int min , int max ) {
467

468
    struct qstack {
469
        volatile int i, j, min, max;
470
        volatile int ready;
471
472
        };
    struct qstack *qstack;
473
    int qstack_size = 2*(max-min) + 10;
474
    volatile unsigned int first, last, waiting;
475
476
477
    
    int pivot;
    int i, ii, j, jj, temp_i, qid;
478
    struct part temp_p;
479
    struct xpart temp_xp;
480
481
482
483

    /* for ( int k = 0 ; k < N ; k++ )
        if ( ind[k] > max || ind[k] < min )
	    error( "ind[%i]=%i is not in [%i,%i]." , k , ind[k] , min , max ); */
484
    
485
486
487
488
    /* Allocate the stack. */
    if ( ( qstack = malloc( sizeof(struct qstack) * qstack_size ) ) == NULL )
        error( "Failed to allocate qstack." );
    
489
490
491
492
493
    /* Init the interval stack. */
    qstack[0].i = 0;
    qstack[0].j = N-1;
    qstack[0].min = min;
    qstack[0].max = max;
494
    qstack[0].ready = 1;
495
    for ( i = 1 ; i < qstack_size ; i++ )
496
497
        qstack[i].ready = 0;
    first = 0; last = 1; waiting = 1;
498
499
    
    /* Parallel bit. */
500
    #pragma omp parallel default(none) shared(N,first,last,waiting,qstack,parts,xparts,ind,qstack_size,stderr,engine_rank) private(pivot,i,ii,j,jj,min,max,temp_i,qid,temp_xp,temp_p)
501
    {
502
    
503
        /* Main loop. */
504
        if ( omp_get_thread_num() < 8 )
505
506
        while ( waiting > 0 ) {
        
507
            /* Grab an interval off the queue. */
508
            qid = atomic_inc( &first ) % qstack_size;
509
            
510
            /* Wait for the interval to be ready. */
511
            while ( waiting > 0 && atomic_cas( &qstack[qid].ready , 1 , 1 ) != 1 );
512
513
514
515
516
            
            /* Broke loop for all the wrong reasons? */
            if ( waiting == 0 )
                break;
        
517
518
519
520
521
            /* Get the stack entry. */
            i = qstack[qid].i;
            j = qstack[qid].j;
            min = qstack[qid].min;
            max = qstack[qid].max;
522
            qstack[qid].ready = 0;
523
            // message( "thread %i got interval [%i,%i] with values in [%i,%i]." , omp_get_thread_num() , i , j , min , max );
524
            
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
            /* Loop over sub-intervals. */
            while ( 1 ) {
            
                /* Bring beer. */
                pivot = (min + max) / 2;
                
                /* One pass of QuickSort's partitioning. */
                ii = i; jj = j;
                while ( ii < jj ) {
                    while ( ii <= j && ind[ii] <= pivot )
                        ii++;
                    while ( jj >= i && ind[jj] > pivot )
                        jj--;
                    if ( ii < jj ) {
                        temp_i = ind[ii]; ind[ii] = ind[jj]; ind[jj] = temp_i;
                        temp_p = parts[ii]; parts[ii] = parts[jj]; parts[jj] = temp_p;
541
                        temp_xp = xparts[ii]; xparts[ii] = xparts[jj]; xparts[jj] = temp_xp;
542
                        }
543
                    }
544

545
546
547
                /* Verify sort. */
                /* for ( int k = i ; k <= jj ; k++ )
                    if ( ind[k] > pivot ) {
548
                        message( "sorting failed at k=%i, ind[k]=%i, pivot=%i, i=%i, j=%i, N=%i." , k , ind[k] , pivot , i , j , N );
549
550
551
552
                        error( "Partition failed (<=pivot)." );
                        }
                for ( int k = jj+1 ; k <= j ; k++ )
                    if ( ind[k] <= pivot ) {
553
                        message( "sorting failed at k=%i, ind[k]=%i, pivot=%i, i=%i, j=%i, N=%i." , k , ind[k] , pivot , i , j , N );
554
555
556
557
558
559
560
561
                        error( "Partition failed (>pivot)." );
                        } */
                        
                /* Split-off largest interval. */
                if ( jj - i > j - jj+1 ) {

                    /* Recurse on the left? */
                    if ( jj > i  && pivot > min ) {
562
                        qid = atomic_inc( &last ) % qstack_size;
563
                        while ( atomic_cas( &qstack[qid].ready , 0 , 0 ) != 0 );
564
565
566
567
568
                        qstack[qid].i = i;
                        qstack[qid].j = jj;
                        qstack[qid].min = min;
                        qstack[qid].max = pivot;
                        qstack[qid].ready = 1;
569
570
                        if ( atomic_inc( &waiting ) >= qstack_size )
                            error( "Qstack overflow." );
571
572
573
574
575
576
577
578
579
580
                        }

                    /* Recurse on the right? */
                    if ( jj+1 < j && pivot+1 < max ) {
                        i = jj+1;
                        min = pivot+1;
                        }
                    else
                        break;
                        
581
                    }
582
583
584
585
586
                    
                else {
                
                    /* Recurse on the right? */
                    if ( jj+1 < j && pivot+1 < max ) {
587
                        qid = atomic_inc( &last ) % qstack_size;
588
                        while ( atomic_cas( &qstack[qid].ready , 0 , 0 ) != 0 );
589
590
591
592
593
                        qstack[qid].i = jj+1;
                        qstack[qid].j = j;
                        qstack[qid].min = pivot+1;
                        qstack[qid].max = max;
                        qstack[qid].ready = 1;
594
595
                        if ( atomic_inc( &waiting ) >= qstack_size )
                            error( "Qstack overflow." );
596
597
598
599
600
601
602
603
604
                        }
                        
                    /* Recurse on the left? */
                    if ( jj > i  && pivot > min ) {
                        j = jj;
                        max = pivot;
                        }
                    else
                        break;
605

606
607
608
                    }
                    
                } /* loop over sub-intervals. */
609
    
610
            atomic_dec( &waiting );
611

612
613
614
            } /* main loop. */
    
        } /* parallel bit. */
615
    
616
    /* Verify sort. */
617
    /* for ( i = 1 ; i < N ; i++ )
618
        if ( ind[i-1] > ind[i] )
619
            error( "Sorting failed (ind[%i]=%i,ind[%i]=%i)." , i-1 , ind[i-1] , i , ind[i] ); */
620
621
622
            
    /* Clean up. */
    free( qstack );
623

624
625
626
    }


627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
void gparts_sort ( struct gpart *gparts , int *ind , int N , int min , int max ) {

    struct qstack {
        volatile int i, j, min, max;
        volatile int ready;
        };
    struct qstack *qstack;
    int qstack_size = 2*(max-min) + 10;
    volatile unsigned int first, last, waiting;
    
    int pivot;
    int i, ii, j, jj, temp_i, qid;
    struct gpart temp_p;

    /* for ( int k = 0 ; k < N ; k++ )
        if ( ind[k] > max || ind[k] < min )
	    error( "ind[%i]=%i is not in [%i,%i]." , k , ind[k] , min , max ); */
    
    /* Allocate the stack. */
    if ( ( qstack = malloc( sizeof(struct qstack) * qstack_size ) ) == NULL )
        error( "Failed to allocate qstack." );
    
    /* Init the interval stack. */
    qstack[0].i = 0;
    qstack[0].j = N-1;
    qstack[0].min = min;
    qstack[0].max = max;
    qstack[0].ready = 1;
    for ( i = 1 ; i < qstack_size ; i++ )
        qstack[i].ready = 0;
    first = 0; last = 1; waiting = 1;
    
    /* Parallel bit. */
    #pragma omp parallel default(none) shared(N,first,last,waiting,qstack,gparts,ind,qstack_size,stderr,engine_rank) private(pivot,i,ii,j,jj,min,max,temp_i,qid,temp_p)
    {
    
        /* Main loop. */
        if ( omp_get_thread_num() < 8 )
        while ( waiting > 0 ) {
        
            /* Grab an interval off the queue. */
            qid = atomic_inc( &first ) % qstack_size;
            
            /* Wait for the interval to be ready. */
            while ( waiting > 0 && atomic_cas( &qstack[qid].ready , 1 , 1 ) != 1 );
            
            /* Broke loop for all the wrong reasons? */
            if ( waiting == 0 )
                break;
        
            /* Get the stack entry. */
            i = qstack[qid].i;
            j = qstack[qid].j;
            min = qstack[qid].min;
            max = qstack[qid].max;
            qstack[qid].ready = 0;
            // message( "thread %i got interval [%i,%i] with values in [%i,%i]." , omp_get_thread_num() , i , j , min , max );
            
            /* Loop over sub-intervals. */
            while ( 1 ) {
            
                /* Bring beer. */
                pivot = (min + max) / 2;
                
                /* One pass of QuickSort's partitioning. */
                ii = i; jj = j;
                while ( ii < jj ) {
                    while ( ii <= j && ind[ii] <= pivot )
                        ii++;
                    while ( jj >= i && ind[jj] > pivot )
                        jj--;
                    if ( ii < jj ) {
                        temp_i = ind[ii]; ind[ii] = ind[jj]; ind[jj] = temp_i;
                        temp_p = gparts[ii]; gparts[ii] = gparts[jj]; gparts[jj] = temp_p;
                        }
                    }

                /* Verify sort. */
                /* for ( int k = i ; k <= jj ; k++ )
                    if ( ind[k] > pivot ) {
                        message( "sorting failed at k=%i, ind[k]=%i, pivot=%i, i=%i, j=%i, N=%i." , k , ind[k] , pivot , i , j , N );
                        error( "Partition failed (<=pivot)." );
                        }
                for ( int k = jj+1 ; k <= j ; k++ )
                    if ( ind[k] <= pivot ) {
                        message( "sorting failed at k=%i, ind[k]=%i, pivot=%i, i=%i, j=%i, N=%i." , k , ind[k] , pivot , i , j , N );
                        error( "Partition failed (>pivot)." );
                        } */
                        
                /* Split-off largest interval. */
                if ( jj - i > j - jj+1 ) {

                    /* Recurse on the left? */
                    if ( jj > i  && pivot > min ) {
                        qid = atomic_inc( &last ) % qstack_size;
                        while ( atomic_cas( &qstack[qid].ready , 0 , 0 ) != 0 );
                        qstack[qid].i = i;
                        qstack[qid].j = jj;
                        qstack[qid].min = min;
                        qstack[qid].max = pivot;
                        qstack[qid].ready = 1;
                        if ( atomic_inc( &waiting ) >= qstack_size )
                            error( "Qstack overflow." );
                        }

                    /* Recurse on the right? */
                    if ( jj+1 < j && pivot+1 < max ) {
                        i = jj+1;
                        min = pivot+1;
                        }
                    else
                        break;
                        
                    }
                    
                else {
                
                    /* Recurse on the right? */
                    if ( jj+1 < j && pivot+1 < max ) {
                        qid = atomic_inc( &last ) % qstack_size;
                        while ( atomic_cas( &qstack[qid].ready , 0 , 0 ) != 0 );
                        qstack[qid].i = jj+1;
                        qstack[qid].j = j;
                        qstack[qid].min = pivot+1;
                        qstack[qid].max = max;
                        qstack[qid].ready = 1;
                        if ( atomic_inc( &waiting ) >= qstack_size )
                            error( "Qstack overflow." );
                        }
                        
                    /* Recurse on the left? */
                    if ( jj > i  && pivot > min ) {
                        j = jj;
                        max = pivot;
                        }
                    else
                        break;

                    }
                    
                } /* loop over sub-intervals. */
    
            atomic_dec( &waiting );

            } /* main loop. */
    
        } /* parallel bit. */
    
    /* Verify sort. */
    /* for ( i = 1 ; i < N ; i++ )
        if ( ind[i-1] > ind[i] )
            error( "Sorting failed (ind[%i]=%i,ind[%i]=%i)." , i-1 , ind[i-1] , i , ind[i] ); */
            
    /* Clean up. */
    free( qstack );

    }


Pedro Gonnet's avatar
Pedro Gonnet committed
786
/**
787
 * @brief Mapping function to free the sorted indices buffers.
Pedro Gonnet's avatar
Pedro Gonnet committed
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
 */

void space_map_clearsort ( struct cell *c , void *data ) {

    if ( c->sort != NULL ) {
        free( c->sort );
        c->sort = NULL;
        }

    }


/**
 * @brief Map a function to all particles in a aspace.
 *
 * @param s The #space we are working in.
804
805
 * @param fun Function pointer to apply on the cells.
 * @param data Data passed to the function fun.
Pedro Gonnet's avatar
Pedro Gonnet committed
806
807
808
809
 */
 
void space_map_parts ( struct space *s , void (*fun)( struct part *p , struct cell *c , void *data ) , void *data ) {

Pedro Gonnet's avatar
bug.    
Pedro Gonnet committed
810
    int cid = 0;
Pedro Gonnet's avatar
Pedro Gonnet committed
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829

    void rec_map ( struct cell *c ) {
    
        int k;
        
        /* No progeny? */
        if ( !c->split )
            for ( k = 0 ; k < c->count ; k++ )
                fun( &c->parts[k] , c , data );
                
        /* Otherwise, recurse. */
        else
            for ( k = 0 ; k < 8 ; k++ )
                if ( c->progeny[k] != NULL )
                    rec_map( c->progeny[k] );
                
        }
        
    /* Call the recursive function on all higher-level cells. */
830
831
832
833
834
835
836
    #pragma omp parallel shared(cid)
    {
        int mycid;
        while ( 1 ) {
            #pragma omp critical
            mycid = cid++;
            if ( mycid < s->nr_cells )
Pedro Gonnet's avatar
bug.    
Pedro Gonnet committed
837
                rec_map( &s->cells[mycid] );
838
839
840
841
            else
                break;
            }
        }
Pedro Gonnet's avatar
Pedro Gonnet committed
842
843
844
845
846
847
848
849

    }


/**
 * @brief Map a function to all particles in a aspace.
 *
 * @param s The #space we are working in.
850
 * @param full Map to all cells, including cells with sub-cells.
851
852
 * @param fun Function pointer to apply on the cells.
 * @param data Data passed to the function fun.
Pedro Gonnet's avatar
Pedro Gonnet committed
853
854
 */
 
855
856
void space_map_cells_post ( struct space *s , int full , void (*fun)( struct cell *c , void *data ) , void *data ) {

Pedro Gonnet's avatar
bug.    
Pedro Gonnet committed
857
    int cid = 0;
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875

    void rec_map ( struct cell *c ) {
    
        int k;
        
        /* Recurse. */
        if ( c->split )
            for ( k = 0 ; k < 8 ; k++ )
                if ( c->progeny[k] != NULL )
                    rec_map( c->progeny[k] );
                
        /* No progeny? */
        if ( full || !c->split )
            fun( c , data );
                
        }
        
    /* Call the recursive function on all higher-level cells. */
876
    // #pragma omp parallel shared(s,cid)
877
878
879
    {
        int mycid;
        while ( 1 ) {
880
            // #pragma omp critical
881
882
            mycid = cid++;
            if ( mycid < s->nr_cells )
Pedro Gonnet's avatar
bug.    
Pedro Gonnet committed
883
                rec_map( &s->cells[mycid] );
884
885
886
887
            else
                break;
            }
        }
888
889
890
891
892

    }


void space_map_cells_pre ( struct space *s , int full , void (*fun)( struct cell *c , void *data ) , void *data ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
893

Pedro Gonnet's avatar
bug.    
Pedro Gonnet committed
894
    int cid = 0;
Pedro Gonnet's avatar
Pedro Gonnet committed
895
896
897
898
899
900

    void rec_map ( struct cell *c ) {
    
        int k;
        
        /* No progeny? */
901
        if ( full || !c->split )
Pedro Gonnet's avatar
Pedro Gonnet committed
902
903
            fun( c , data );
                
904
905
        /* Recurse. */
        if ( c->split )
Pedro Gonnet's avatar
Pedro Gonnet committed
906
907
908
909
910
911
912
            for ( k = 0 ; k < 8 ; k++ )
                if ( c->progeny[k] != NULL )
                    rec_map( c->progeny[k] );
                
        }
        
    /* Call the recursive function on all higher-level cells. */
913
    // #pragma omp parallel shared(s,cid)
Pedro Gonnet's avatar
Pedro Gonnet committed
914
915
916
    {
        int mycid;
        while ( 1 ) {
917
            // #pragma omp critical
Pedro Gonnet's avatar
Pedro Gonnet committed
918
919
            mycid = cid++;
            if ( mycid < s->nr_cells )
Pedro Gonnet's avatar
bug.    
Pedro Gonnet committed
920
                rec_map( &s->cells[mycid] );
Pedro Gonnet's avatar
Pedro Gonnet committed
921
922
923
924
            else
                break;
            }
        }
Pedro Gonnet's avatar
Pedro Gonnet committed
925
926
927
928
929
930
931
932
933
934
935
936
937

    }


/**
 * @brief Split cells that contain too many particles.
 *
 * @param s The #space we are working in.
 * @param c The #cell under consideration.
 */
 
void space_split ( struct space *s , struct cell *c ) {

938
    int k, count = c->count, gcount = c->gcount, maxdepth = 0;
939
940
941
    float h, h_max = 0.0f, dt, dt_min = c->parts[0].dt, dt_max = dt_min;
    struct cell *temp;
    struct part *p, *parts = c->parts;
942
    struct xpart *xp, *xparts = c->xparts;
943
944
945
946
947
948
    
    /* Check the depth. */
    if ( c->depth > s->maxdepth )
        s->maxdepth = c->depth;
    
    /* Split or let it be? */
949
    if ( count > space_splitsize || gcount > space_splitsize ) {
950
951
952
953
954
955
956
957
    
        /* No longer just a leaf. */
        c->split = 1;
        
        /* Create the cell's progeny. */
        for ( k = 0 ; k < 8 ; k++ ) {
            temp = space_getcell( s );
            temp->count = 0;
958
            temp->gcount = 0;
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
            temp->loc[0] = c->loc[0];
            temp->loc[1] = c->loc[1];
            temp->loc[2] = c->loc[2];
            temp->h[0] = c->h[0]/2;
            temp->h[1] = c->h[1]/2;
            temp->h[2] = c->h[2]/2;
            temp->dmin = c->dmin/2;
            if ( k & 4 )
                temp->loc[0] += temp->h[0];
            if ( k & 2 )
                temp->loc[1] += temp->h[1];
            if ( k & 1 )
                temp->loc[2] += temp->h[2];
            temp->depth = c->depth + 1;
            temp->split = 0;
            temp->h_max = 0.0;
            temp->dx_max = 0.0;
976
            temp->nodeID = c->nodeID;
977
978
979
980
981
982
983
984
985
            temp->parent = c;
            c->progeny[k] = temp;
            }
            
        /* Split the cell data. */
        cell_split( c );
            
        /* Remove any progeny with zero parts. */
        for ( k = 0 ; k < 8 ; k++ )
986
            if ( c->progeny[k]->count == 0 && c->progeny[k]->gcount == 0 ) {
987
988
989
990
991
                space_recycle( s , c->progeny[k] );
                c->progeny[k] = NULL;
                }
            else {
                space_split( s , c->progeny[k] );
Pedro Gonnet's avatar
Pedro Gonnet committed
992
993
994
995
996
                h_max = fmaxf( h_max , c->progeny[k]->h_max );
                dt_min = fminf( dt_min , c->progeny[k]->dt_min );
                dt_max = fmaxf( dt_max , c->progeny[k]->dt_max );
                if ( c->progeny[k]->maxdepth > maxdepth )
                    maxdepth = c->progeny[k]->maxdepth;
997
                }
998
999
1000
1001
1002
1003
                
        /* Set the values for this cell. */
        c->h_max = h_max;
        c->dt_min = dt_min;
        c->dt_max = dt_max;
        c->maxdepth = maxdepth;
1004
1005
1006
1007
1008
1009
1010
1011
1012
                
        }
        
    /* Otherwise, collect the data for this cell. */
    else {
    
        /* Clear the progeny. */
        bzero( c->progeny , sizeof(struct cell *) * 8 );
        c->split = 0;
Pedro Gonnet's avatar
Pedro Gonnet committed
1013
        c->maxdepth = c->depth;
1014
1015
1016
1017
1018
        
        /* Get dt_min/dt_max. */
        
        for ( k = 0 ; k < count ; k++ ) {
            p = &parts[k];
1019
            xp = &xparts[k];
Pedro Gonnet's avatar
Pedro Gonnet committed
1020
1021
1022
            xp->x_old[0] = p->x[0];
            xp->x_old[1] = p->x[1];
            xp->x_old[2] = p->x[2];
Pedro Gonnet's avatar
Pedro Gonnet committed
1023
            dt = p->dt;
1024
            h = p->h;
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
            if ( h > h_max )
                h_max = h;
            if ( dt < dt_min )
                dt_min = dt;
            if ( dt > dt_max )
                dt_max = dt;
            }
        c->h_max = h_max;
        c->dt_min = dt_min;
        c->dt_max = dt_max;
            
        }
1037
1038
        
    /* Set ownership accorind to the start of the parts array. */
1039
    c->owner = ( ( c->parts - s->parts ) % s->nr_parts ) * s->nr_queues / s->nr_parts;
1040
1041
1042
1043

    }


Pedro Gonnet's avatar
Pedro Gonnet committed
1044
1045
1046
1047
1048
1049
1050
1051
1052
/**
 * @brief Return a used cell to the cell buffer.
 *
 * @param s The #space.
 * @param c The #cell.
 */
 
void space_recycle ( struct space *s , struct cell *c ) {

1053
1054
1055
    /* Lock the space. */
    lock_lock( &s->lock );
    
Pedro Gonnet's avatar
Pedro Gonnet committed
1056
1057
1058
    /* Clear the cell. */
    if ( lock_destroy( &c->lock ) != 0 )
        error( "Failed to destroy spinlock." );
1059
1060
1061
1062
        
    /* Clear this cell's sort arrays. */
    if ( c->sort != NULL )
        free( c->sort );
1063
1064
1065
        
    /* Clear the cell data. */
    bzero( c , sizeof(struct cell) );
Pedro Gonnet's avatar
Pedro Gonnet committed
1066
1067
1068
1069
1070
1071
    
    /* Hook this cell into the buffer. */
    c->next = s->cells_new;
    s->cells_new = c;
    s->tot_cells -= 1;
    
1072
1073
1074
    /* Unlock the space. */
    lock_unlock_blind( &s->lock );
    
Pedro Gonnet's avatar
Pedro Gonnet committed
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
    }


/**
 * @brief Get a new empty cell.
 *
 * @param s The #space.
 */
 
struct cell *space_getcell ( struct space *s ) {

    struct cell *c;
    int k;
    
1089
1090
1091
    /* Lock the space. */
    lock_lock( &s->lock );
    
Pedro Gonnet's avatar
Pedro Gonnet committed
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
    /* Is the buffer empty? */
    if ( s->cells_new == NULL ) {
        if ( posix_memalign( (void *)&s->cells_new , 64 , space_cellallocchunk * sizeof(struct cell) ) != 0 )
            error( "Failed to allocate more cells." );
        bzero( s->cells_new , space_cellallocchunk * sizeof(struct cell) );
        for ( k = 0 ; k < space_cellallocchunk-1 ; k++ )
            s->cells_new[k].next = &s->cells_new[k+1];
        s->cells_new[ space_cellallocchunk-1 ].next = NULL;
        }

    /* Pick off the next cell. */
    c = s->cells_new;
    s->cells_new = c->next;
    s->tot_cells += 1;
    
1107
1108
1109
    /* Unlock the space. */
    lock_unlock_blind( &s->lock );
    
Pedro Gonnet's avatar
Pedro Gonnet committed
1110
    /* Init some things in the cell. */
1111
1112
    bzero( c , sizeof(struct cell) );
    c->nodeID = -1;
1113
1114
1115
    if ( lock_init( &c->lock ) != 0 ||
         lock_init( &c->glock ) != 0 )
        error( "Failed to initialize cell spinlocks." );
Pedro Gonnet's avatar
Pedro Gonnet committed
1116
1117
1118
1119
1120
1121
1122
1123
1124
        
    return c;

    }


/**
 * @brief Split the space into cells given the array of particles.
 *
1125
 * @param s The #space to initialize.
Pedro Gonnet's avatar
Pedro Gonnet committed
1126
1127
1128
1129
 * @param dim Spatial dimensions of the domain.
 * @param parts Pointer to an array of #part.
 * @param N The number of parts in the space.
 * @param periodic flag whether the domain is periodic or not.
1130
 * @param h_max The maximal interaction radius.
Pedro Gonnet's avatar
Pedro Gonnet committed
1131
1132
1133
1134
1135
1136
1137
1138
 *
 * Makes a grid of edge length > r_max and fills the particles
 * into the respective cells. Cells containing more than #space_maxppc
 * parts with a cutoff below half the cell width are then split
 * recursively.
 */


Pedro Gonnet's avatar
Pedro Gonnet committed
1139
void space_init ( struct space *s , double dim[3] , struct part *parts , int N , int periodic , double h_max ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
1140
1141
1142
1143
1144

    /* Store eveything in the space. */
    s->dim[0] = dim[0]; s->dim[1] = dim[1]; s->dim[2] = dim[2];
    s->periodic = periodic;
    s->nr_parts = N;
1145
    s->size_parts = N;
1146
    s->parts = parts;
1147
    s->cell_min = h_max;
1148
    s->nr_queues = 1;
1149
    s->size_parts_foreign = 0;
1150
    
1151
    /* Allocate the xtra parts array. */
1152
1153
    if ( posix_memalign( (void *)&s->xparts , 32 , N * sizeof(struct xpart) ) != 0 )
        error( "Failed to allocate xparts." );
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
    bzero( s->xparts , N * sizeof(struct xpart) );
    
    /* Initialize the velocities and internal energies. */
    for ( int k = 0 ; k < N ; k++ ) {
        struct part *p = &parts[k];
        struct xpart *xp = &s->xparts[k];
        xp->v_hdt[0] = p->v[0];
        xp->v_hdt[1] = p->v[1];
        xp->v_hdt[2] = p->v[2];
        xp->u_hdt = p->u;
        }
1165
        
1166
1167
1168
1169
1170
        
    /* For now, clone the parts to make gparts. */
    if ( posix_memalign( (void *)&s->gparts , part_align , N * sizeof(struct gpart) ) != 0 )
        error( "Failed to allocate gparts." );
    bzero( s->gparts , N * sizeof(struct gpart) );
1171
    /* for ( int k = 0 ; k < N ; k++ ) {
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
        s->gparts[k].x[0] = s->parts[k].x[0];
        s->gparts[k].x[1] = s->parts[k].x[1];
        s->gparts[k].x[2] = s->parts[k].x[2];
        s->gparts[k].v[0] = s->parts[k].v[0];
        s->gparts[k].v[1] = s->parts[k].v[1];
        s->gparts[k].v[2] = s->parts[k].v[2];
        s->gparts[k].mass = s->parts[k].mass;
        s->gparts[k].dt = s->parts[k].dt;
        s->gparts[k].id = s->parts[k].id;
        s->gparts[k].part = &s->parts[k];
        s->parts[k].gpart = &s->gparts[k];
        }
1184
1185
    s->nr_gparts = s->nr_parts; */
    s->nr_gparts = 0;
1186
1187
1188
    s->size_gparts = s->size_parts;
    
        
1189
1190
1191
    /* Init the space lock. */
    if ( lock_init( &s->lock ) != 0 )
        error( "Failed to create space spin-lock." );
Pedro Gonnet's avatar
Pedro Gonnet committed
1192
    
1193
    /* Build the cells and the tasks. */
1194
    space_regrid( s , h_max );
Pedro Gonnet's avatar
Pedro Gonnet committed
1195
1196
1197
        
    }