cell.c 8.42 KB
Newer Older
1
2
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
31
32
33
34
35
36
37
38
39
40
/*******************************************************************************
 * This file is part of GadgetSMP.
 * 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>

/* Local headers. */
#include "cycle.h"
#include "lock.h"
#include "task.h"
#include "part.h"
#include "cell.h"


/* Error macro. */
41
#define error(s) { fprintf( stderr , "%s:%s:%i: %s\n" , __FILE__ , __FUNCTION__ , __LINE__ , s ); abort(); }
42
43
44
45
46
47
48
49
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
78
79
80
81
82
83
84
85
86
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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282


/* The timers. */
ticks cell_timer[ cell_timer_count ];


/* Define the timer macros. */
#ifdef TIMER_VERBOSE
    #define TIMER
#endif
#ifdef TIMER
    #define TIMER_TIC ticks tic = getticks();
    #define TIMER_TOC(t) timer_toc( t , tic )
    #define TIMER_TIC2 ticks tic2 = getticks();
    #define TIMER_TOC2(t) timer_toc( t , tic2 )
    #ifndef INLINE
    # if __GNUC__ && !__GNUC_STDC_INLINE__
    #  define INLINE extern inline
    # else
    #  define INLINE inline
    # endif
    #endif
    INLINE ticks timer_toc ( int t , ticks tic ) {
        ticks d = (getticks() - tic);
        __sync_add_and_fetch( &cell_timer[t] , d );
        return d;
        }
#else
    #define TIMER_TIC
    #define TIMER_TOC(t)
#endif

/**
 * @brief Lock a cell and hold its parents.
 *
 * @param c The #cell.
 */
 
int cell_locktree( struct cell *c ) {

    struct cell *finger, *finger2;
    TIMER_TIC

    /* First of all, try to lock this cell. */
    if ( lock_trylock( &c->lock ) != 0 ) {
        TIMER_TOC(cell_timer_tree);
        return 1;
        }
        
    /* Did somebody hold this cell in the meantime? */
    if ( c->hold ) {
        
        /* Unlock this cell. */
        if ( lock_unlock( &c->lock ) != 0 )
            error( "Failed to unlock cell." );
            
        /* Admit defeat. */
        TIMER_TOC(cell_timer_tree);
        return 1;
    
        }
        
    /* Climb up the tree and lock/hold/unlock. */
    for ( finger = c->parent ; finger != NULL ; finger = finger->parent ) {
    
        /* Lock this cell. */
        if ( lock_trylock( &finger->lock ) != 0 )
            break;
            
        /* Increment the hold. */
        __sync_fetch_and_add( &finger->hold , 1 );
        
        /* Unlock the cell. */
        if ( lock_unlock( &finger->lock ) != 0 )
            error( "Failed to unlock cell." );
    
        }
        
    /* If we reached the top of the tree, we're done. */
    if ( finger == NULL ) {
        TIMER_TOC(cell_timer_tree);
        return 0;
        }
        
    /* Otherwise, we hit a snag. */
    else {
    
        /* Undo the holds up to finger. */
        for ( finger2 = c->parent ; finger2 != finger ; finger2 = finger2->parent )
            __sync_fetch_and_sub( &finger2->hold , 1 );
            
        /* Unlock this cell. */
        if ( lock_unlock( &c->lock ) != 0 )
            error( "Failed to unlock cell." );
            
        /* Admit defeat. */
        TIMER_TOC(cell_timer_tree);
        return 1;
    
        }

    }
    
    
/**
 * @brief Unock a cell's parents.
 *
 * @param c The #cell.
 */
 
void cell_unlocktree( struct cell *c ) {

    struct cell *finger;
    TIMER_TIC

    /* First of all, try to unlock this cell. */
    if ( lock_unlock( &c->lock ) != 0 )
        error( "Failed to unlock cell." );
        
    /* Climb up the tree and unhold the parents. */
    for ( finger = c->parent ; finger != NULL ; finger = finger->parent )
        __sync_fetch_and_sub( &finger->hold , 1 );
        
    TIMER_TOC(cell_timer_tree);
        
    }
    
    
/**
 * @brief Sort the parts into eight bins along the given pivots.
 *
 * @param c The #cell array to be sorted.
 */
 
void cell_split ( struct cell *c  ) {

    int i, j, k, kk;
    struct part temp, *parts = c->parts;
    int left[8], right[8];
    double pivot[3];
    
    /* Init the pivot. */
    for ( k = 0 ; k < 3 ; k++ )
        pivot[k] = c->loc[k] + c->h[k]/2;
    
    /* Split along the x-axis. */
    i = 0; j = c->count - 1;
    while ( i <= j ) {
        while ( i <= c->count-1 && parts[i].x[0] <= pivot[0] )
            i += 1;
        while ( j >= 0 && parts[j].x[0] > pivot[0] )
            j -= 1;
        if ( i < j ) {
            temp = parts[i]; parts[i] = parts[j]; parts[j] = temp;
            }
        }
    for ( k = 0 ; k <= j ; k++ )
        if ( parts[k].x[0] > pivot[0] )
            error( "cell_split: sorting failed." );
    for ( k = i ; k < c->count ; k++ )
        if ( parts[k].x[0] < pivot[0] )
            error( "cell_split: sorting failed." );
    left[1] = i; right[1] = c->count - 1;
    left[0] = 0; right[0] = j;
    
    /* Split along the y axis, twice. */
    for ( k = 1 ; k >= 0 ; k-- ) {
        i = left[k]; j = right[k];
        while ( i <= j ) {
            while ( i <= right[k] && parts[i].x[1] <= pivot[1] )
                i += 1;
            while ( j >= left[k] && parts[j].x[1] > pivot[1] )
                j -= 1;
            if ( i < j ) {
                temp = parts[i]; parts[i] = parts[j]; parts[j] = temp;
                }
            }
        for ( kk = left[k] ; kk <= j ; kk++ )
            if ( parts[kk].x[1] > pivot[1] ) {
                printf( "cell_split: ival=[%i,%i], i=%i, j=%i.\n" , left[k] , right[k] , i , j );
                error( "sorting failed (left)." );
                }
        for ( kk = i ; kk <= right[k] ; kk++ )
            if ( parts[kk].x[1] < pivot[1] )
                error( "sorting failed (right)." );
        left[2*k+1] = i; right[2*k+1] = right[k];
        left[2*k] = left[k]; right[2*k] = j;
        }

    /* Split along the z axis, four times. */
    for ( k = 3 ; k >= 0 ; k-- ) {
        i = left[k]; j = right[k];
        while ( i <= j ) {
            while ( i <= right[k] && parts[i].x[2] <= pivot[2] )
                i += 1;
            while ( j >= left[k] && parts[j].x[2] > pivot[2] )
                j -= 1;
            if ( i < j ) {
                temp = parts[i]; parts[i] = parts[j]; parts[j] = temp;
                }
            }
        for ( kk = left[k] ; kk <= j ; kk++ )
            if ( parts[kk].x[2] > pivot[2] ) {
                printf( "cell_split: ival=[%i,%i], i=%i, j=%i.\n" , left[k] , right[k] , i , j );
                error( "sorting failed (left)." );
                }
        for ( kk = i ; kk <= right[k] ; kk++ )
            if ( parts[kk].x[2] < pivot[2] ) {
                printf( "cell_split: ival=[%i,%i], i=%i, j=%i.\n" , left[k] , right[k] , i , j );
                error( "sorting failed (right)." );
                }
        left[2*k+1] = i; right[2*k+1] = right[k];
        left[2*k] = left[k]; right[2*k] = j;
        }
        
    /* Store the counts and offsets. */
    for ( k = 0 ; k < 8 ; k++ ) {
        c->progeny[k]->count = right[k] - left[k] + 1;
        c->progeny[k]->parts = &c->parts[ left[k] ];
        }
        
    /* Verify a few sub-cells. */
    /* for ( k = 0 ; k < c->progeny[0]->count ; k++ )
        if ( c->progeny[0]->parts[k].x[0] > pivot[0] ||
             c->progeny[0]->parts[k].x[1] > pivot[1] ||
             c->progeny[0]->parts[k].x[2] > pivot[2] )
            error( "Sorting failed (progeny=0)." );
    for ( k = 0 ; k < c->progeny[1]->count ; k++ )
        if ( c->progeny[1]->parts[k].x[0] > pivot[0] ||
             c->progeny[1]->parts[k].x[1] > pivot[1] ||
             c->progeny[1]->parts[k].x[2] <= pivot[2] )
            error( "Sorting failed (progeny=1)." );
    for ( k = 0 ; k < c->progeny[2]->count ; k++ )
        if ( c->progeny[2]->parts[k].x[0] > pivot[0] ||
             c->progeny[2]->parts[k].x[1] <= pivot[1] ||
             c->progeny[2]->parts[k].x[2] > pivot[2] )
            error( "Sorting failed (progeny=2)." ); */

    }