runner.c 22.9 KB
Newer Older
1
/*******************************************************************************
2
 * This file is part of SWIFT.
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 * 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/>.
 * 
 ******************************************************************************/
Pedro Gonnet's avatar
Pedro Gonnet committed
19

Pedro Gonnet's avatar
Pedro Gonnet committed
20
21
/* Config parameters. */
#include "../config.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
22
23
24
25
26
27
28
29
30
31

/* Some standard headers. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <math.h>
#include <float.h>
#include <limits.h>
#include <omp.h>
Pedro Gonnet's avatar
Pedro Gonnet committed
32
#include <sched.h>
Pedro Gonnet's avatar
Pedro Gonnet committed
33
34
35

/* Local headers. */
#include "cycle.h"
36
#include "timers.h"
37
#include "const.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
38
#include "lock.h"
39
40
41
#include "task.h"
#include "part.h"
#include "cell.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
42
#include "space.h"
43
#include "queue.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
44
#include "engine.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
45
#include "runner.h"
46
#include "runner_iact.h"
Pedro Gonnet's avatar
Pedro Gonnet committed
47
48

/* Error macro. */
49
#define error(s) { fprintf( stderr , "%s:%s:%i: %s\n" , __FILE__ , __FUNCTION__ , __LINE__ , s ); abort(); }
Pedro Gonnet's avatar
Pedro Gonnet committed
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77

/* Convert cell location to ID. */
#define cell_getid( cdim , i , j , k ) ( (int)(k) + (cdim)[2]*( (int)(j) + (cdim)[1]*(int)(i) ) )

/* The counters. */
int runner_counter[ runner_counter_count ];

        

const float runner_shift[13*3] = {
     5.773502691896258e-01 ,  5.773502691896258e-01 ,  5.773502691896258e-01 ,
     7.071067811865475e-01 ,  7.071067811865475e-01 ,  0.0                   ,
     5.773502691896258e-01 ,  5.773502691896258e-01 , -5.773502691896258e-01 ,
     7.071067811865475e-01 ,  0.0                   ,  7.071067811865475e-01 ,
     1.0                   ,  0.0                   ,  0.0                   ,
     7.071067811865475e-01 ,  0.0                   , -7.071067811865475e-01 ,
     5.773502691896258e-01 , -5.773502691896258e-01 ,  5.773502691896258e-01 ,
     7.071067811865475e-01 , -7.071067811865475e-01 ,  0.0                   ,
     5.773502691896258e-01 , -5.773502691896258e-01 , -5.773502691896258e-01 ,
     0.0                   ,  7.071067811865475e-01 ,  7.071067811865475e-01 ,
     0.0                   ,  1.0                   ,  0.0                   ,
     0.0                   ,  7.071067811865475e-01 , -7.071067811865475e-01 ,
     0.0                   ,  0.0                   ,  1.0                   ,
    };
const char runner_flip[27] = { 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 ,
                               0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 }; 


78
79
80
81
82
83
84
85
86
/* Import the density functions. */
#define FUNCTION density
#include "runner_doiact.h"

#undef FUNCTION
#define FUNCTION force
#include "runner_doiact.h"


Pedro Gonnet's avatar
Pedro Gonnet committed
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/**
 * @brief Sort the entries in ascending order using QuickSort.
 *
 * @param sort The entries
 * @param N The number of entries.
 */
 
void runner_dosort_ascending ( struct entry *sort , int N ) {

    struct {
        short int lo, hi;
        } qstack[10];
    int qpos, i, j, lo, hi, imin;
    struct entry temp;
    float pivot;
        
    /* Sort parts in cell_i in decreasing order with quicksort */
    qstack[0].lo = 0; qstack[0].hi = N - 1; qpos = 0;
    while ( qpos >= 0 ) {
        lo = qstack[qpos].lo; hi = qstack[qpos].hi;
        qpos -= 1;
        if ( hi - lo < 15 ) {
            for ( i = lo ; i < hi ; i++ ) {
                imin = i;
                for ( j = i+1 ; j <= hi ; j++ )
                    if ( sort[j].d < sort[imin].d )
                        imin = j;
                if ( imin != i ) {
                    temp = sort[imin]; sort[imin] = sort[i]; sort[i] = temp;
                    }
                }
            }
        else {
            pivot = sort[ ( lo + hi ) / 2 ].d;
            i = lo; j = hi;
            while ( i <= j ) {
                while ( sort[i].d < pivot ) i++;
                while ( sort[j].d > pivot ) j--;
                if ( i <= j ) {
                    if ( i < j ) {
                        temp = sort[i]; sort[i] = sort[j]; sort[j] = temp;
                        }
                    i += 1; j -= 1;
                    }
                }
            if ( j > ( lo + hi ) / 2 ) {
                if ( lo < j ) {
                    qpos += 1;
                    qstack[qpos].lo = lo;
                    qstack[qpos].hi = j;
                    }
                if ( i < hi ) {
                    qpos += 1;
                    qstack[qpos].lo = i;
                    qstack[qpos].hi = hi;
                    }
                }
            else {
                if ( i < hi ) {
                    qpos += 1;
                    qstack[qpos].lo = i;
                    qstack[qpos].hi = hi;
                    }
                if ( lo < j ) {
                    qpos += 1;
                    qstack[qpos].lo = lo;
                    qstack[qpos].hi = j;
                    }
                }
            }
        }
                
    }
    
    
/**
 * @brief Sort the particles in the given cell along all cardinal directions.
 *
 * @param r The #runner.
 * @param c The #cell.
 */
 
Pedro Gonnet's avatar
Pedro Gonnet committed
169
void runner_dosort ( struct runner *r , struct cell *c , int flags ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
170
171
172

    struct entry *finger;
    struct entry *fingers[8];
173
    struct cpart *cparts = c->cparts;
Pedro Gonnet's avatar
Pedro Gonnet committed
174
    int j, k, count = c->count;
Pedro Gonnet's avatar
Pedro Gonnet committed
175
    int i, ind, off[8], inds[8], temp_i, missing;
176
    // float shift[3];
Pedro Gonnet's avatar
Pedro Gonnet committed
177
    float buff[8], px[3];
Pedro Gonnet's avatar
Pedro Gonnet committed
178
179
180
181
182
    TIMER_TIC
    
    /* start by allocating the entry arrays. */
    if ( lock_lock( &c->lock ) != 0 )
        error( "Failed to lock cell." );
183
184
185
186
187
    if ( c->sort == NULL || c->sortsize < c->count ) {
        if ( c->sort != NULL )
            free( c->sort );
        c->sortsize = c->count * 1.1;
        if ( ( c->sort = (struct entry *)malloc( sizeof(struct entry) * (c->sortsize + 1) * 13 ) ) == NULL )
Pedro Gonnet's avatar
Pedro Gonnet committed
188
            error( "Failed to allocate sort memory." );
189
        }
Pedro Gonnet's avatar
Pedro Gonnet committed
190
191
192
193
194
195
    if ( lock_unlock( &c->lock ) != 0 )
        error( "Failed to unlock cell." );
        
    /* Does this cell have any progeny? */
    if ( c->split ) {
    
Pedro Gonnet's avatar
Pedro Gonnet committed
196
197
198
199
200
201
202
203
204
205
206
207
208
209
        /* Fill in the gaps within the progeny. */
        for ( k = 0 ; k < 8 ; k++ ) {
            if ( c->progeny[k] == NULL )
                continue;
            if ( c->progeny[k]->sorts[0] == NULL )
                missing = flags;
            else
                missing = ( c->progeny[k]->sorts[0]->flags ^ flags ) & flags;
            if ( missing )
                runner_dosort( r , c->progeny[k] , missing );
            }
    
        /* Loop over the 13 different sort arrays. */
        for ( j = 0 ; j < 13 ; j++ ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
210
211
212
213
214
        
            /* Has this sort array been flagged? */
            if ( !( flags & (1 << j) ) )
                continue;
                
215
216
217
218
219
220
221
222
223
224
225
226
227
228
            /* Init the particle index offsets. */
            for ( off[0] = 0 , k = 1 ; k < 8 ; k++ )
                if ( c->progeny[k-1] != NULL )
                    off[k] = off[k-1] + c->progeny[k-1]->count;
                else
                    off[k] = off[k-1];

            /* Init the entries and indices. */
            for ( k = 0 ; k < 8 ; k++ ) {
                inds[k] = k;
                if ( c->progeny[k] != NULL && c->progeny[k]->count > 0 ) {
                    fingers[k] = &c->progeny[k]->sort[ j*(c->progeny[k]->count + 1) ];
                    buff[k] = fingers[k]->d;
                    off[k] = off[k];
Pedro Gonnet's avatar
Pedro Gonnet committed
229
                    }
230
231
                else
                    buff[k] = FLT_MAX;
Pedro Gonnet's avatar
Pedro Gonnet committed
232
233
                }

234
235
236
237
238
239
            /* Sort the buffer. */
            for ( i = 0 ; i < 7 ; i++ )
                for ( k = i+1 ; k < 8 ; k++ )
                    if ( buff[ inds[k] ] < buff[ inds[i] ] ) {
                        temp_i = inds[i]; inds[i] = inds[k]; inds[k] = temp_i;
                        }
Pedro Gonnet's avatar
Pedro Gonnet committed
240

241
242
243
            /* For each entry in the new sort list. */
            finger = &c->sort[ j*(count + 1) ];
            for ( ind = 0 ; ind < count ; ind++ ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
244

245
246
247
                /* Copy the minimum into the new sort array. */
                finger[ind].d = buff[inds[0]];
                finger[ind].i = fingers[inds[0]]->i + off[inds[0]];
Pedro Gonnet's avatar
Pedro Gonnet committed
248

249
250
251
                /* Update the buffer. */
                fingers[inds[0]] += 1;
                buff[inds[0]] = fingers[inds[0]]->d;
Pedro Gonnet's avatar
Pedro Gonnet committed
252

253
254
255
256
                /* Find the smallest entry. */
                for ( k = 1 ; k < 8 && buff[inds[k]] < buff[inds[k-1]] ; k++ ) {
                    temp_i = inds[k-1]; inds[k-1] = inds[k]; inds[k] = temp_i;
                    }
Pedro Gonnet's avatar
Pedro Gonnet committed
257

258
                } /* Merge. */
Pedro Gonnet's avatar
Pedro Gonnet committed
259
260
261
262
263
264
265
266
267
268
269
270
            
            /* Add a sentinel. */
            c->sort[ j*(c->count + 1) + c->count ].d = FLT_MAX;
            c->sort[ j*(c->count + 1) + c->count ].i = 0;
            
            } /* loop over sort arrays. */
    
        } /* progeny? */
        
    /* Otherwise, just sort. */
    else {
    
271
        /* Fill the sort array. */
Pedro Gonnet's avatar
Pedro Gonnet committed
272
        for ( k = 0 ; k < count ; k++ ) {
273
274
275
            px[0] = cparts[k].x[0];
            px[1] = cparts[k].x[1];
            px[2] = cparts[k].x[2];
276
277
278
            for ( j = 0 ; j < 13 ; j++ )
                if ( flags & (1 << j) ) {
                    c->sort[ j*(count + 1) + k].i = k;
Pedro Gonnet's avatar
Pedro Gonnet committed
279
                    c->sort[ j*(count + 1) + k].d = px[0]*runner_shift[ 3*j + 0 ] + px[1]*runner_shift[ 3*j + 1 ] + px[2]*runner_shift[ 3*j + 2 ];
280
                    }
Pedro Gonnet's avatar
Pedro Gonnet committed
281
            }
282
283

        /* Add the sentinel and sort. */
Pedro Gonnet's avatar
Pedro Gonnet committed
284
        for ( j = 0 ; j < 13 ; j++ )
285
286
287
288
            if ( flags & (1 << j) ) {
                c->sort[ j*(count + 1) + c->count ].d = FLT_MAX;
                c->sort[ j*(count + 1) + c->count ].i = 0;
                runner_dosort_ascending( &c->sort[ j*(count + 1) ] , c->count );
Pedro Gonnet's avatar
Pedro Gonnet committed
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
                }
            
        }
        
    /* Verify the sorting. */
    /* for ( j = 0 ; j < 13 ; j++ ) {
        if ( !( flags & (1 << j) ) )
            continue;
        finger = &c->sort[ j*(c->count + 1) ];
        for ( k = 1 ; k < c->count ; k++ ) {
            if ( finger[k].d < finger[k-1].d )
                error( "Sorting failed, ascending array." );
            if ( finger[k].i >= c->count )
                error( "Sorting failed, indices borked." );
            }
        } */
305
        
Pedro Gonnet's avatar
Pedro Gonnet committed
306
307
    #ifdef TIMER_VERBOSE
        printf( "runner_dosort[%02i]: %i parts at depth %i (flags = %i%i%i%i%i%i%i%i%i%i%i%i%i) took %.3f ms.\n" ,
Pedro Gonnet's avatar
Pedro Gonnet committed
308
            r->id , c->count , c->depth ,
Pedro Gonnet's avatar
Pedro Gonnet committed
309
            (flags & 0x1000) >> 12 , (flags & 0x800) >> 11 , (flags & 0x400) >> 10 , (flags & 0x200) >> 9 , (flags & 0x100) >> 8 , (flags & 0x80) >> 7 , (flags & 0x40) >> 6 , (flags & 0x20) >> 5 , (flags & 0x10) >> 4 , (flags & 0x8) >> 3 , (flags & 0x4) >> 2 , (flags & 0x2) >> 1 , (flags & 0x1) >> 0 , 
310
            ((double)TIMER_TOC(timer_dosort)) / CPU_TPS * 1000 ); fflush(stdout);
Pedro Gonnet's avatar
Pedro Gonnet committed
311
    #else
312
        TIMER_TOC(timer_dosort);
Pedro Gonnet's avatar
Pedro Gonnet committed
313
314
315
    #endif

    }
316
317
318
319
320
    
    
/**
 * @brief Intermediate task between density and force
 *
Pedro Gonnet's avatar
Pedro Gonnet committed
321
 * @param r The runner thread.
322
323
324
 * @param ci THe cell.
 */
 
Pedro Gonnet's avatar
Pedro Gonnet committed
325
void runner_doghost ( struct runner *r , struct cell *c ) {
326
327

    struct part *p;
328
    struct cpart *cp;
329
    struct cell *finger;
Pedro Gonnet's avatar
Pedro Gonnet committed
330
331
332
    int i, k, redo, count = c->count;
    int *pid;
    float ihg, ihg2;
333
    float dt_max = r->e->dt_max;
334
335
    TIMER_TIC
    
Pedro Gonnet's avatar
Pedro Gonnet committed
336
337
338
339
340
341
342
    /* Recurse? */
    if ( c->split ) {
        for ( k = 0 ; k < 8 ; k++ )
            if ( c->progeny[k] != NULL )
                runner_doghost( r , c->progeny[k] );
        return;
        }
343
        
Pedro Gonnet's avatar
Pedro Gonnet committed
344
345
346
347
348
349
350
351
    /* Init the IDs that have to be updated. */
    if ( ( pid = (int *)alloca( sizeof(int) * count ) ) == NULL )
        error( "Call to alloca failed." );
    for ( k = 0 ; k < count ; k++ )
        pid[k] = k;
        
    /* While there are particles that need to be updated... */
    while ( count > 0 ) {
352
    
Pedro Gonnet's avatar
Pedro Gonnet committed
353
354
        /* Reset the redo-count. */
        redo = 0;
355
    
Pedro Gonnet's avatar
Pedro Gonnet committed
356
357
358
359
360
        /* Loop over the parts in this cell. */
        for ( i = 0 ; i < count ; i++ ) {

            /* Get a direct pointer on the part. */
            p = &c->parts[ pid[i] ];
361
            cp = &c->cparts[ pid[i] ];
362
            
363
            /* Is this part within the timestep? */
364
            if ( cp->dt <= dt_max ) {
365
366
367
368

                /* Adjust the computed rho. */
                ihg = kernel_igamma / p->h;
                ihg2 = ihg * ihg;
369
                p->rho = ihg * ihg2 * ( p->rho + p->mass*kernel_root );
370
                p->rho_dh *= ihg2 * ihg2;
371
                p->wcount += kernel_wroot;
372
373

                /* Update the smoothing length. */
374
                p->h -= ( p->wcount - const_nwneigh ) / p->wcount_dh;
375
                cp->h = p->h;
376
377

                /* Did we get the right number density? */
378
379
                if ( p->wcount > const_nwneigh + 1 ||
                     p->wcount < const_nwneigh - 1 ) {
380
                    // printf( "runner_doghost: particle %lli (h=%e,h_dt=%e,depth=%i) has bad wcount=%.3f.\n" , p->id , p->h , p->h_dt , c->depth , p->wcount ); fflush(stdout);
381
382
383
384
385
386
387
388
389
390
391
392
                    // p->h += ( p->wcount + kernel_root - const_nwneigh ) / p->wcount_dh;
                    pid[redo] = pid[i];
                    redo += 1;
                    p->wcount = 0.0;
                    p->wcount_dh = 0.0;
                    p->rho = 0.0;
                    p->rho_dh = 0.0;
                    continue;
                    }
                    
                /* Compute this particle's time step. */
                p->dt = const_cfl * p->h / sqrtf( const_gamma * ( const_gamma - 1.0f ) * p->u );
393
                cp->dt = p->dt;
394
395
396
397
398
399
400

                /* Compute the pressure. */
                // p->P = p->rho * p->u * ( const_gamma - 1.0f );

                /* Compute the P/Omega/rho2. */
                p->POrho2 = p->u * ( const_gamma - 1.0f ) / ( p->rho + p->h * p->rho_dh / 3.0f );

401
402
403
                /* Reset the acceleration. */
                for ( k = 0 ; k < 3 ; k++ )
                    p->a[k] = 0.0f;
Pedro Gonnet's avatar
Pedro Gonnet committed
404

405
406
407
                /* Reset the time derivatives. */
                p->u_dt = 0.0f;
                p->h_dt = 0.0f;
Pedro Gonnet's avatar
Pedro Gonnet committed
408

409
                }
Pedro Gonnet's avatar
Pedro Gonnet committed
410
411

            }
412
            
Pedro Gonnet's avatar
Pedro Gonnet committed
413
414
        /* Re-set the counter for the next loop (potentially). */
        count = redo;
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
        if ( count > 0 ) {
        
            // error( "Bad smoothing length, fixing this isn't implemented yet." );
            
            /* Climb up the cell hierarchy. */
            for ( finger = c ; finger != NULL ; finger = finger->parent ) {
            
                /* Run through this cell's density interactions. */
                for ( k = 0 ; k < finger->nr_density ; k++ ) {
                
                    /* Self-interaction? */
                    if ( finger->density[k]->type == task_type_self )
                        runner_doself_subset_density( r , finger , c->parts , pid , count );
                        
                    /* Otherwise, pair interaction? */
                    else if ( finger->density[k]->type == task_type_pair ) {
                    
                        /* Left or right? */
                        if ( finger->density[k]->ci == finger )
                            runner_dopair_subset_density( r , finger , c->parts , pid , count , finger->density[k]->cj );
                        else
                            runner_dopair_subset_density( r , finger , c->parts , pid , count , finger->density[k]->ci );
                        
                        }
                
                    /* Otherwise, sub interaction? */
441
442
443
444
445
446
447
448
449
                    else if ( finger->density[k]->type == task_type_sub ) {
                    
                        /* Left or right? */
                        if ( finger->density[k]->ci == finger )
                            runner_dosub_subset_density( r , finger , c->parts , pid , count , finger->density[k]->cj , -1 );
                        else
                            runner_dosub_subset_density( r , finger , c->parts , pid , count , finger->density[k]->ci , -1 );
                        
                        }
450
451
                
                    }
Pedro Gonnet's avatar
Pedro Gonnet committed
452
                    
453
454
455
                }
        
            }
456
457
458
459
460
            
        }

    #ifdef TIMER_VERBOSE
        printf( "runner_doghost[%02i]: %i parts at depth %i took %.3f ms.\n" ,
Pedro Gonnet's avatar
Pedro Gonnet committed
461
            r->id , c->count , c->depth ,
462
            ((double)TIMER_TOC(timer_doghost)) / CPU_TPS * 1000 ); fflush(stdout);
463
    #else
464
        TIMER_TOC(timer_doghost);
465
466
467
    #endif
    
    }
Pedro Gonnet's avatar
Pedro Gonnet committed
468
469
470
471
472
473
474
475
476
477


/**
 * @brief The #runner main thread routine.
 *
 * @param data A pointer to this thread's data.
 */
 
void *runner_main ( void *data ) {

Pedro Gonnet's avatar
Pedro Gonnet committed
478
479
480
    struct runner *r = (struct runner *)data;
    struct engine *e = r->e;
    int threadID = r->id;
Pedro Gonnet's avatar
Pedro Gonnet committed
481
    int k, qid, naq, keep, tpq;
Pedro Gonnet's avatar
Pedro Gonnet committed
482
    struct queue *queues[ e->nr_queues ], *myq;
Pedro Gonnet's avatar
Pedro Gonnet committed
483
484
    struct task *t;
    struct cell *ci, *cj;
Pedro Gonnet's avatar
Pedro Gonnet committed
485
    unsigned int myseed = rand() + r->id;
Pedro Gonnet's avatar
Pedro Gonnet committed
486
487
488
489
490
491
492
493
    #ifdef TIMER
        ticks stalled;
    #endif
    
    /* Main loop. */
    while ( 1 ) {
    
        /* Wait at the barrier. */
Pedro Gonnet's avatar
Pedro Gonnet committed
494
        engine_barrier( e );
Pedro Gonnet's avatar
Pedro Gonnet committed
495
496
        
        /* Set some convenient local data. */
Pedro Gonnet's avatar
Pedro Gonnet committed
497
        keep = e->policy & engine_policy_keep;
Pedro Gonnet's avatar
Pedro Gonnet committed
498
        myq = &e->queues[ threadID * e->nr_queues / e->nr_threads ];
Pedro Gonnet's avatar
Pedro Gonnet committed
499
        tpq = ceil( ((double)e->nr_threads) / e->nr_queues );
500
501
502
        #ifdef TIMER
            stalled = 0;
        #endif
Pedro Gonnet's avatar
Pedro Gonnet committed
503
504
        
        /* Set up the local list of active queues. */
Pedro Gonnet's avatar
Pedro Gonnet committed
505
        naq = e->nr_queues;
Pedro Gonnet's avatar
Pedro Gonnet committed
506
        for ( k = 0 ; k < naq ; k++ )
Pedro Gonnet's avatar
Pedro Gonnet committed
507
            queues[k] = &e->queues[k];
Pedro Gonnet's avatar
Pedro Gonnet committed
508
509
    
        /* Set up the local list of active queues. */
Pedro Gonnet's avatar
Pedro Gonnet committed
510
        naq = e->nr_queues;
Pedro Gonnet's avatar
Pedro Gonnet committed
511
        for ( k = 0 ; k < naq ; k++ )
Pedro Gonnet's avatar
Pedro Gonnet committed
512
            queues[k] = &e->queues[k];
Pedro Gonnet's avatar
Pedro Gonnet committed
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
    
        /* Loop while there are tasks... */
        while ( 1 ) {
        
            /* Remove any inactive queues. */
            for ( k = 0 ; k < naq ; k++ )
                if ( queues[k]->next == queues[k]->count ) {
                    naq -= 1;
                    queues[k] = queues[naq];
                    k -= 1;
                    }
            if ( naq == 0 )
                break;
        
            /* Get a task, how and from where depends on the policy. */
            TIMER_TIC
            t = NULL;
Pedro Gonnet's avatar
Pedro Gonnet committed
530
            if ( e->nr_queues == 1 ) {
531
                t = queue_gettask_old( &e->queues[0] , 1 , 0 );
Pedro Gonnet's avatar
Pedro Gonnet committed
532
                }
Pedro Gonnet's avatar
Pedro Gonnet committed
533
            else if ( e->policy & engine_policy_steal ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
534
                if ( ( myq->next == myq->count ) ||
535
                     ( t = queue_gettask( myq , r->id , 0 , 0 ) ) == NULL ) {
Pedro Gonnet's avatar
Pedro Gonnet committed
536
                    TIMER_TIC2
537
                    qid = rand_r( &myseed ) % naq;
Pedro Gonnet's avatar
Pedro Gonnet committed
538
                    keep = ( e->policy & engine_policy_keep ) &&
Pedro Gonnet's avatar
Pedro Gonnet committed
539
540
541
542
543
                           ( myq->count <= myq->size-tpq );
                    if ( myq->next == myq->count )
                        COUNT(runner_counter_steal_empty);
                    else
                        COUNT(runner_counter_steal_stall);
544
                    t = queue_gettask( queues[qid] , r->id , 0 , keep );
Pedro Gonnet's avatar
Pedro Gonnet committed
545
546
                    if ( t != NULL && keep )
                        queue_insert( myq , t );
547
                    TIMER_TOC2(timer_steal);
Pedro Gonnet's avatar
Pedro Gonnet committed
548
549
                    }
                }
Pedro Gonnet's avatar
Pedro Gonnet committed
550
            else if ( e->policy & engine_policy_rand ) {
551
                qid = rand_r( &myseed ) % naq;
552
                t = queue_gettask( queues[qid] , r->id , e->policy & engine_policy_block , 0 );
Pedro Gonnet's avatar
Pedro Gonnet committed
553
554
                }
            else {
555
                t = queue_gettask( &e->queues[threadID] , r->id , e->policy & engine_policy_block , 0 );
Pedro Gonnet's avatar
Pedro Gonnet committed
556
                }
557
            TIMER_TOC(timer_getpair);
Pedro Gonnet's avatar
Pedro Gonnet committed
558
559
560
561
            
            /* Did I get anything? */
            if ( t == NULL ) {
                COUNT(runner_counter_stall);
562
563
564
565
                #ifdef TIMER
                    if ( !stalled )
                        stalled = getticks();
                #endif
Pedro Gonnet's avatar
Pedro Gonnet committed
566
567
568
569
                continue;
                }
            #ifdef TIMER
            else if ( stalled ) {
570
                timers_toc( timer_stalled , stalled );
Pedro Gonnet's avatar
Pedro Gonnet committed
571
                #ifdef TIMER_VERBOSE
Pedro Gonnet's avatar
Pedro Gonnet committed
572
                    printf( "runner_main[%02i]: stalled %.3f ms\n" , r->id , ((double)stalled) / CPU_TPS * 1000 );
Pedro Gonnet's avatar
Pedro Gonnet committed
573
574
575
576
577
578
579
580
581
582
583
584
                    fflush(stdout);
                #endif
                stalled = 0;
                }
            #endif
        
            /* Get the cells. */
            ci = t->ci;
            cj = t->cj;
            
            /* Different types of tasks... */
            switch ( t->type ) {
585
586
                case task_type_self:
                    if ( t->subtype == task_subtype_density )
587
                        runner_doself1_density( r , ci );
588
                    else if ( t->subtype == task_subtype_force )
589
                        runner_doself2_force( r , ci );
590
591
                    else
                        error( "Unknown task subtype." );
Pedro Gonnet's avatar
Pedro Gonnet committed
592
593
                    cell_unlocktree( ci );
                    break;
594
595
                case task_type_pair:
                    if ( t->subtype == task_subtype_density )
596
                        runner_dopair1_density( r , ci , cj );
597
                    else if ( t->subtype == task_subtype_force )
598
                        runner_dopair2_force( r , ci , cj );
599
600
                    else
                        error( "Unknown task subtype." );
Pedro Gonnet's avatar
Pedro Gonnet committed
601
602
603
                    cell_unlocktree( ci );
                    cell_unlocktree( cj );
                    break;
604
                case task_type_sort:
Pedro Gonnet's avatar
Pedro Gonnet committed
605
                    runner_dosort( r , ci , t->flags );
Pedro Gonnet's avatar
Pedro Gonnet committed
606
                    break;
607
608
                case task_type_sub:
                    if ( t->subtype == task_subtype_density )
609
                        runner_dosub1_density( r , ci , cj , t->flags );
610
                    else if ( t->subtype == task_subtype_force )
611
                        runner_dosub2_force( r , ci , cj , t->flags );
612
613
                    else
                        error( "Unknown task subtype." );
Pedro Gonnet's avatar
Pedro Gonnet committed
614
615
616
617
                    cell_unlocktree( ci );
                    if ( cj != NULL )
                        cell_unlocktree( cj );
                    break;
618
                case task_type_ghost:
Pedro Gonnet's avatar
Pedro Gonnet committed
619
                    if ( ci->super == ci )
Pedro Gonnet's avatar
Pedro Gonnet committed
620
                        runner_doghost( r , ci );
621
                    break;
Pedro Gonnet's avatar
Pedro Gonnet committed
622
623
624
625
626
627
                default:
                    error( "Unknown task type." );
                }
                
            /* Resolve any dependencies. */
            for ( k = 0 ; k < t->nr_unlock_tasks ; k++ )
Pedro Gonnet's avatar
Pedro Gonnet committed
628
629
                if ( __sync_fetch_and_sub( &t->unlock_tasks[k]->wait , 1 ) == 0 )
                    abort();
Pedro Gonnet's avatar
Pedro Gonnet committed
630
631
632
633
634
635
636
637
            for ( k = 0 ; k < t->nr_unlock_cells ; k++ )
                __sync_fetch_and_sub( &t->unlock_cells[k]->wait , 1 );
        
            } /* main loop. */
            
    	/* Any leftover stalls? */    
        #ifdef TIMER
        if ( stalled ) {
638
            timers_toc( timer_stalled , stalled );
Pedro Gonnet's avatar
Pedro Gonnet committed
639
            #ifdef TIMER_VERBOSE
Pedro Gonnet's avatar
Pedro Gonnet committed
640
                printf( "runner_main[%02i]: stalled %.3f ms\n" , r->id , ((double)stalled) / CPU_TPS * 1000 );
Pedro Gonnet's avatar
Pedro Gonnet committed
641
642
643
644
645
646
647
648
649
650
651
652
653
654
                fflush(stdout);
            #endif
            stalled = 0;
            }
        #endif
            
        }
        
    /* Be kind, rewind. */
    return NULL;

    }