| /*************************************************************************/ |
| /* */ |
| /* Copyright (c) 1994 Stanford University */ |
| /* */ |
| /* All rights reserved. */ |
| /* */ |
| /* Permission is given to use, copy, and modify this software for any */ |
| /* non-commercial purpose as long as this copyright notice is not */ |
| /* removed. All other uses, including redistribution in whole or in */ |
| /* part, are forbidden without prior written permission. */ |
| /* */ |
| /* This software is provided with absolutely no warranty and no */ |
| /* support. */ |
| /* */ |
| /*************************************************************************/ |
| |
| #include "defs.h" |
| #include "memory.h" |
| #include "box.h" |
| #include "partition_grid.h" |
| #include "cost_zones.h" |
| |
| #define NUM_DIRECTIONS 4 |
| |
| typedef enum { RIGHT, LEFT, UP, DOWN } direction; |
| |
| static long Child_Sequence[NUM_DIRECTIONS][NUM_OFFSPRING] = |
| { |
| { 0, 1, 2, 3 }, |
| { 2, 3, 0, 1 }, |
| { 0, 3, 2, 1 }, |
| { 2, 1, 0, 3 }, |
| }; |
| static long Direction_Sequence[NUM_DIRECTIONS][NUM_OFFSPRING] = |
| { |
| { UP, RIGHT, RIGHT, DOWN }, |
| { DOWN, LEFT, LEFT, UP }, |
| { RIGHT, UP, UP, LEFT }, |
| { LEFT, DOWN, DOWN, RIGHT }, |
| }; |
| |
| void ComputeSubTreeCosts(long my_id, box *b); |
| void CostZonesHelper(long my_id, box *b, long work, direction dir); |
| |
| |
| void |
| CostZones (long my_id) |
| { |
| PartitionIterate(my_id, ComputeSubTreeCosts, BOTTOM); |
| BARRIER(G_Memory->synch, Number_Of_Processors); |
| Local[my_id].Total_Work = Grid->subtree_cost; |
| Local[my_id].Min_Work = ((Local[my_id].Total_Work / Number_Of_Processors) |
| * my_id); |
| if (my_id == (Number_Of_Processors - 1)) |
| Local[my_id].Max_Work = Local[my_id].Total_Work; |
| else |
| Local[my_id].Max_Work = (Local[my_id].Min_Work |
| + (Local[my_id].Total_Work |
| / Number_Of_Processors)); |
| InitPartition(my_id); |
| CostZonesHelper(my_id, Grid, 0, RIGHT); |
| BARRIER(G_Memory->synch, Number_Of_Processors); |
| } |
| |
| |
| void |
| ComputeSubTreeCosts (long my_id, box *b) |
| { |
| box *pb; |
| |
| if (b->type == PARENT) { |
| while (b->interaction_synch != b->num_children) { |
| } |
| } |
| b->interaction_synch = 0; |
| ComputeCostOfBox(b); |
| b->subtree_cost += b->cost; |
| pb = b->parent; |
| if (pb != NULL) { |
| ALOCK(G_Memory->lock_array, pb->exp_lock_index); |
| pb->subtree_cost += b->subtree_cost; |
| pb->interaction_synch += 1; |
| AULOCK(G_Memory->lock_array, pb->exp_lock_index); |
| } |
| } |
| |
| |
| void |
| CostZonesHelper (long my_id, box *b, long work, direction dir) |
| { |
| box *cb; |
| long i; |
| long *next_child; |
| long *child_dir; |
| |
| if (b->type == CHILDLESS) { |
| if (work >= Local[my_id].Min_Work) |
| InsertBoxInPartition(my_id, b); |
| } |
| else { |
| next_child = Child_Sequence[dir]; |
| child_dir = Direction_Sequence[dir]; |
| for (i = 0; (i < NUM_OFFSPRING) && (work < Local[my_id].Max_Work); |
| i++) { |
| cb = b->children[next_child[i]]; |
| if (cb != NULL) { |
| if ((work + cb->subtree_cost) >= Local[my_id].Min_Work) |
| CostZonesHelper(my_id, cb, work, child_dir[i]); |
| work += cb->subtree_cost; |
| } |
| if (i == 2) { |
| if ((work >= Local[my_id].Min_Work) |
| && (work < Local[my_id].Max_Work)) |
| InsertBoxInPartition(my_id, b); |
| work += b->cost; |
| } |
| } |
| } |
| |
| } |
| |
| |
| #undef DOWN |
| #undef UP |
| #undef LEFT |
| #undef RIGHT |
| #undef NUM_DIRECTIONS |
| |
