| 23 |
|
/* number of children (-1 in child) */ |
| 24 |
|
static int nchild = 0; |
| 25 |
|
|
| 26 |
+ |
typedef struct { |
| 27 |
+ |
int nrows, ncols; /* array size (matches migration) */ |
| 28 |
+ |
float *price; /* migration prices */ |
| 29 |
+ |
short *sord; /* sort for each row, low to high */ |
| 30 |
+ |
} PRICEMAT; /* sorted pricing matrix */ |
| 31 |
+ |
|
| 32 |
+ |
#define pricerow(p,i) ((p)->price + (i)*(p)->ncols) |
| 33 |
+ |
#define psortrow(p,i) ((p)->sord + (i)*(p)->ncols) |
| 34 |
+ |
|
| 35 |
|
/* Create a new migration holder (sharing memory for multiprocessing) */ |
| 36 |
|
static MIGRATION * |
| 37 |
|
new_migration(RBFNODE *from_rbf, RBFNODE *to_rbf) |
| 119 |
|
if (pid < 0) { |
| 120 |
|
fprintf(stderr, "%s: cannot fork subprocess\n", |
| 121 |
|
progname); |
| 122 |
+ |
await_children(nchild); |
| 123 |
|
exit(1); |
| 124 |
|
} |
| 125 |
|
++nchild; /* subprocess started */ |
| 134 |
|
|
| 135 |
|
#endif /* ! _WIN32 */ |
| 136 |
|
|
| 137 |
+ |
/* Comparison routine needed for sorting price row */ |
| 138 |
+ |
static int |
| 139 |
+ |
msrt_cmp(void *b, const void *p1, const void *p2) |
| 140 |
+ |
{ |
| 141 |
+ |
PRICEMAT *pm = (PRICEMAT *)b; |
| 142 |
+ |
int ri = ((const short *)p1 - pm->sord) / pm->ncols; |
| 143 |
+ |
float c1 = pricerow(pm,ri)[*(const short *)p1]; |
| 144 |
+ |
float c2 = pricerow(pm,ri)[*(const short *)p2]; |
| 145 |
+ |
|
| 146 |
+ |
if (c1 > c2) return(1); |
| 147 |
+ |
if (c1 < c2) return(-1); |
| 148 |
+ |
return(0); |
| 149 |
+ |
} |
| 150 |
+ |
|
| 151 |
|
/* Compute (and allocate) migration price matrix for optimization */ |
| 152 |
< |
static float * |
| 153 |
< |
price_routes(const RBFNODE *from_rbf, const RBFNODE *to_rbf) |
| 152 |
> |
static void |
| 153 |
> |
price_routes(PRICEMAT *pm, const RBFNODE *from_rbf, const RBFNODE *to_rbf) |
| 154 |
|
{ |
| 131 |
– |
float *pmtx = (float *)malloc(sizeof(float) * |
| 132 |
– |
from_rbf->nrbf * to_rbf->nrbf); |
| 155 |
|
FVECT *vto = (FVECT *)malloc(sizeof(FVECT) * to_rbf->nrbf); |
| 156 |
|
int i, j; |
| 157 |
|
|
| 158 |
< |
if ((pmtx == NULL) | (vto == NULL)) { |
| 158 |
> |
pm->nrows = from_rbf->nrbf; |
| 159 |
> |
pm->ncols = to_rbf->nrbf; |
| 160 |
> |
pm->price = (float *)malloc(sizeof(float) * pm->nrows*pm->ncols); |
| 161 |
> |
pm->sord = (short *)malloc(sizeof(short) * pm->nrows*pm->ncols); |
| 162 |
> |
|
| 163 |
> |
if ((pm->price == NULL) | (pm->sord == NULL) | (vto == NULL)) { |
| 164 |
|
fprintf(stderr, "%s: Out of memory in migration_costs()\n", |
| 165 |
|
progname); |
| 166 |
|
exit(1); |
| 172 |
|
const double from_ang = R2ANG(from_rbf->rbfa[i].crad); |
| 173 |
|
FVECT vfrom; |
| 174 |
|
ovec_from_pos(vfrom, from_rbf->rbfa[i].gx, from_rbf->rbfa[i].gy); |
| 175 |
< |
for (j = to_rbf->nrbf; j--; ) |
| 176 |
< |
pmtx[i*to_rbf->nrbf + j] = acos(DOT(vfrom, vto[j])) + |
| 175 |
> |
for (j = to_rbf->nrbf; j--; ) { |
| 176 |
> |
double dprod = DOT(vfrom, vto[j]); |
| 177 |
> |
pricerow(pm,i)[j] = ((dprod >= 1.) ? .0 : acos(dprod)) + |
| 178 |
|
fabs(R2ANG(to_rbf->rbfa[j].crad) - from_ang); |
| 179 |
+ |
psortrow(pm,i)[j] = j; |
| 180 |
+ |
} |
| 181 |
+ |
qsort_r(psortrow(pm,i), pm->ncols, sizeof(short), pm, &msrt_cmp); |
| 182 |
|
} |
| 183 |
|
free(vto); |
| 153 |
– |
return(pmtx); |
| 184 |
|
} |
| 185 |
|
|
| 186 |
< |
/* Comparison routine needed for sorting price row */ |
| 187 |
< |
static const float *price_arr; |
| 188 |
< |
static int |
| 159 |
< |
msrt_cmp(const void *p1, const void *p2) |
| 186 |
> |
/* Free price matrix */ |
| 187 |
> |
static void |
| 188 |
> |
free_routes(PRICEMAT *pm) |
| 189 |
|
{ |
| 190 |
< |
float c1 = price_arr[*(const int *)p1]; |
| 191 |
< |
float c2 = price_arr[*(const int *)p2]; |
| 163 |
< |
|
| 164 |
< |
if (c1 > c2) return(1); |
| 165 |
< |
if (c1 < c2) return(-1); |
| 166 |
< |
return(0); |
| 190 |
> |
free(pm->price); pm->price = NULL; |
| 191 |
> |
free(pm->sord); pm->sord = NULL; |
| 192 |
|
} |
| 193 |
|
|
| 194 |
|
/* Compute minimum (optimistic) cost for moving the given source material */ |
| 195 |
|
static double |
| 196 |
< |
min_cost(double amt2move, const double *avail, const float *price, int n) |
| 196 |
> |
min_cost(double amt2move, const double *avail, const PRICEMAT *pm, int s) |
| 197 |
|
{ |
| 173 |
– |
static int *price_sort = NULL; |
| 174 |
– |
static int n_alloc = 0; |
| 198 |
|
double total_cost = 0; |
| 199 |
< |
int i; |
| 199 |
> |
int j; |
| 200 |
|
|
| 201 |
|
if (amt2move <= FTINY) /* pre-emptive check */ |
| 202 |
< |
return(0.); |
| 180 |
< |
if (n > n_alloc) { /* (re)allocate sort array */ |
| 181 |
< |
if (n_alloc) free(price_sort); |
| 182 |
< |
price_sort = (int *)malloc(sizeof(int)*n); |
| 183 |
< |
if (price_sort == NULL) { |
| 184 |
< |
fprintf(stderr, "%s: Out of memory in min_cost()\n", |
| 185 |
< |
progname); |
| 186 |
< |
exit(1); |
| 187 |
< |
} |
| 188 |
< |
n_alloc = n; |
| 189 |
< |
} |
| 190 |
< |
for (i = n; i--; ) |
| 191 |
< |
price_sort[i] = i; |
| 192 |
< |
price_arr = price; |
| 193 |
< |
qsort(price_sort, n, sizeof(int), &msrt_cmp); |
| 202 |
> |
return(.0); |
| 203 |
|
/* move cheapest first */ |
| 204 |
< |
for (i = 0; i < n && amt2move > FTINY; i++) { |
| 205 |
< |
int d = price_sort[i]; |
| 204 |
> |
for (j = 0; j < pm->ncols && amt2move > FTINY; j++) { |
| 205 |
> |
int d = psortrow(pm,s)[j]; |
| 206 |
|
double amt = (amt2move < avail[d]) ? amt2move : avail[d]; |
| 207 |
|
|
| 208 |
< |
total_cost += amt * price[d]; |
| 208 |
> |
total_cost += amt * pricerow(pm,s)[d]; |
| 209 |
|
amt2move -= amt; |
| 210 |
|
} |
| 211 |
|
return(total_cost); |
| 213 |
|
|
| 214 |
|
/* Take a step in migration by choosing optimal bucket to transfer */ |
| 215 |
|
static double |
| 216 |
< |
migration_step(MIGRATION *mig, double *src_rem, double *dst_rem, const float *pmtx) |
| 216 |
> |
migration_step(MIGRATION *mig, double *src_rem, double *dst_rem, const PRICEMAT *pm) |
| 217 |
|
{ |
| 218 |
< |
const double maxamt = .1; |
| 218 |
> |
const double maxamt = 1./(double)pm->ncols; |
| 219 |
|
const double minamt = maxamt*5e-6; |
| 220 |
< |
static double *src_cost = NULL; |
| 212 |
< |
static int n_alloc = 0; |
| 220 |
> |
double *src_cost; |
| 221 |
|
struct { |
| 222 |
|
int s, d; /* source and destination */ |
| 223 |
|
double price; /* price estimate per amount moved */ |
| 224 |
|
double amt; /* amount we can move */ |
| 225 |
|
} cur, best; |
| 226 |
|
int i; |
| 227 |
< |
|
| 228 |
< |
if (mtx_nrows(mig) > n_alloc) { /* allocate cost array */ |
| 229 |
< |
if (n_alloc) |
| 230 |
< |
free(src_cost); |
| 231 |
< |
src_cost = (double *)malloc(sizeof(double)*mtx_nrows(mig)); |
| 232 |
< |
if (src_cost == NULL) { |
| 225 |
< |
fprintf(stderr, "%s: Out of memory in migration_step()\n", |
| 226 |
< |
progname); |
| 227 |
< |
exit(1); |
| 228 |
< |
} |
| 229 |
< |
n_alloc = mtx_nrows(mig); |
| 227 |
> |
/* allocate cost array */ |
| 228 |
> |
src_cost = (double *)malloc(sizeof(double)*pm->nrows); |
| 229 |
> |
if (src_cost == NULL) { |
| 230 |
> |
fprintf(stderr, "%s: Out of memory in migration_step()\n", |
| 231 |
> |
progname); |
| 232 |
> |
exit(1); |
| 233 |
|
} |
| 234 |
< |
for (i = mtx_nrows(mig); i--; ) /* starting costs for diff. */ |
| 235 |
< |
src_cost[i] = min_cost(src_rem[i], dst_rem, |
| 233 |
< |
pmtx+i*mtx_ncols(mig), mtx_ncols(mig)); |
| 234 |
> |
for (i = pm->nrows; i--; ) /* starting costs for diff. */ |
| 235 |
> |
src_cost[i] = min_cost(src_rem[i], dst_rem, pm, i); |
| 236 |
|
|
| 237 |
|
/* find best source & dest. */ |
| 238 |
|
best.s = best.d = -1; best.price = FHUGE; best.amt = 0; |
| 239 |
< |
for (cur.s = mtx_nrows(mig); cur.s--; ) { |
| 238 |
< |
const float *price = pmtx + cur.s*mtx_ncols(mig); |
| 239 |
> |
for (cur.s = pm->nrows; cur.s--; ) { |
| 240 |
|
double cost_others = 0; |
| 241 |
+ |
|
| 242 |
|
if (src_rem[cur.s] <= minamt) |
| 243 |
|
continue; |
| 244 |
< |
cur.d = -1; /* examine cheapest dest. */ |
| 245 |
< |
for (i = mtx_ncols(mig); i--; ) |
| 246 |
< |
if (dst_rem[i] > minamt && |
| 247 |
< |
(cur.d < 0 || price[i] < price[cur.d])) |
| 248 |
< |
cur.d = i; |
| 249 |
< |
if (cur.d < 0) |
| 250 |
< |
return(.0); |
| 251 |
< |
if ((cur.price = price[cur.d]) >= best.price) |
| 250 |
< |
continue; /* no point checking further */ |
| 244 |
> |
/* examine cheapest dest. */ |
| 245 |
> |
for (i = 0; i < pm->ncols; i++) |
| 246 |
> |
if (dst_rem[ cur.d = psortrow(pm,cur.s)[i] ] > minamt) |
| 247 |
> |
break; |
| 248 |
> |
if (i >= pm->ncols) |
| 249 |
> |
break; |
| 250 |
> |
if ((cur.price = pricerow(pm,cur.s)[cur.d]) >= best.price) |
| 251 |
> |
continue; /* no point checking further */ |
| 252 |
|
cur.amt = (src_rem[cur.s] < dst_rem[cur.d]) ? |
| 253 |
|
src_rem[cur.s] : dst_rem[cur.d]; |
| 254 |
|
if (cur.amt > maxamt) cur.amt = maxamt; |
| 255 |
|
dst_rem[cur.d] -= cur.amt; /* add up differential costs */ |
| 256 |
< |
for (i = mtx_nrows(mig); i--; ) |
| 256 |
> |
for (i = pm->nrows; i--; ) |
| 257 |
|
if (i != cur.s) |
| 258 |
< |
cost_others += min_cost(src_rem[i], dst_rem, |
| 258 |
< |
price, mtx_ncols(mig)) |
| 258 |
> |
cost_others += min_cost(src_rem[i], dst_rem, pm, i) |
| 259 |
|
- src_cost[i]; |
| 260 |
|
dst_rem[cur.d] += cur.amt; /* undo trial move */ |
| 261 |
|
cur.price += cost_others/cur.amt; /* adjust effective price */ |
| 262 |
|
if (cur.price < best.price) /* are we better than best? */ |
| 263 |
|
best = cur; |
| 264 |
|
} |
| 265 |
< |
if ((best.s < 0) | (best.d < 0)) |
| 265 |
> |
free(src_cost); /* finish up */ |
| 266 |
> |
|
| 267 |
> |
if ((best.s < 0) | (best.d < 0)) /* nothing left to move? */ |
| 268 |
|
return(.0); |
| 269 |
< |
/* make the actual move */ |
| 269 |
> |
/* else make the actual move */ |
| 270 |
|
mtx_coef(mig,best.s,best.d) += best.amt; |
| 271 |
|
src_rem[best.s] -= best.amt; |
| 272 |
|
dst_rem[best.d] -= best.amt; |
| 273 |
|
return(best.amt); |
| 274 |
|
} |
| 275 |
|
|
| 274 |
– |
#ifdef DEBUG |
| 275 |
– |
static char * |
| 276 |
– |
thetaphi(const FVECT v) |
| 277 |
– |
{ |
| 278 |
– |
static char buf[128]; |
| 279 |
– |
double theta, phi; |
| 280 |
– |
|
| 281 |
– |
theta = 180./M_PI*acos(v[2]); |
| 282 |
– |
phi = 180./M_PI*atan2(v[1],v[0]); |
| 283 |
– |
sprintf(buf, "(%.0f,%.0f)", theta, phi); |
| 284 |
– |
|
| 285 |
– |
return(buf); |
| 286 |
– |
} |
| 287 |
– |
#endif |
| 288 |
– |
|
| 276 |
|
/* Compute and insert migration along directed edge (may fork child) */ |
| 277 |
|
static MIGRATION * |
| 278 |
|
create_migration(RBFNODE *from_rbf, RBFNODE *to_rbf) |
| 279 |
|
{ |
| 280 |
|
const double end_thresh = 5e-6; |
| 281 |
< |
float *pmtx; |
| 281 |
> |
PRICEMAT pmtx; |
| 282 |
|
MIGRATION *newmig; |
| 283 |
|
double *src_rem, *dst_rem; |
| 284 |
|
double total_rem = 1., move_amt; |
| 285 |
< |
int i; |
| 285 |
> |
int i, j; |
| 286 |
|
/* check if exists already */ |
| 287 |
|
for (newmig = from_rbf->ejl; newmig != NULL; |
| 288 |
|
newmig = nextedge(from_rbf,newmig)) |
| 289 |
|
if (newmig->rbfv[1] == to_rbf) |
| 290 |
|
return(NULL); |
| 291 |
|
/* else allocate */ |
| 292 |
+ |
#ifdef DEBUG |
| 293 |
+ |
fprintf(stderr, "Building path from (theta,phi) (%.0f,%.0f) ", |
| 294 |
+ |
get_theta180(from_rbf->invec), |
| 295 |
+ |
get_phi360(from_rbf->invec)); |
| 296 |
+ |
fprintf(stderr, "to (%.0f,%.0f) with %d x %d matrix\n", |
| 297 |
+ |
get_theta180(to_rbf->invec), |
| 298 |
+ |
get_phi360(to_rbf->invec), |
| 299 |
+ |
from_rbf->nrbf, to_rbf->nrbf); |
| 300 |
+ |
#endif |
| 301 |
|
newmig = new_migration(from_rbf, to_rbf); |
| 302 |
|
if (run_subprocess()) |
| 303 |
|
return(newmig); /* child continues */ |
| 304 |
< |
pmtx = price_routes(from_rbf, to_rbf); |
| 304 |
> |
price_routes(&pmtx, from_rbf, to_rbf); |
| 305 |
|
src_rem = (double *)malloc(sizeof(double)*from_rbf->nrbf); |
| 306 |
|
dst_rem = (double *)malloc(sizeof(double)*to_rbf->nrbf); |
| 307 |
|
if ((src_rem == NULL) | (dst_rem == NULL)) { |
| 309 |
|
progname); |
| 310 |
|
exit(1); |
| 311 |
|
} |
| 316 |
– |
#ifdef DEBUG |
| 317 |
– |
fprintf(stderr, "Building path from (theta,phi) %s ", |
| 318 |
– |
thetaphi(from_rbf->invec)); |
| 319 |
– |
fprintf(stderr, "to %s with %d x %d matrix\n", |
| 320 |
– |
thetaphi(to_rbf->invec), |
| 321 |
– |
from_rbf->nrbf, to_rbf->nrbf); |
| 322 |
– |
#endif |
| 312 |
|
/* starting quantities */ |
| 313 |
|
memset(newmig->mtx, 0, sizeof(float)*from_rbf->nrbf*to_rbf->nrbf); |
| 314 |
|
for (i = from_rbf->nrbf; i--; ) |
| 315 |
|
src_rem[i] = rbf_volume(&from_rbf->rbfa[i]) / from_rbf->vtotal; |
| 316 |
< |
for (i = to_rbf->nrbf; i--; ) |
| 317 |
< |
dst_rem[i] = rbf_volume(&to_rbf->rbfa[i]) / to_rbf->vtotal; |
| 316 |
> |
for (j = to_rbf->nrbf; j--; ) |
| 317 |
> |
dst_rem[j] = rbf_volume(&to_rbf->rbfa[j]) / to_rbf->vtotal; |
| 318 |
> |
|
| 319 |
|
do { /* move a bit at a time */ |
| 320 |
< |
move_amt = migration_step(newmig, src_rem, dst_rem, pmtx); |
| 320 |
> |
move_amt = migration_step(newmig, src_rem, dst_rem, &pmtx); |
| 321 |
|
total_rem -= move_amt; |
| 332 |
– |
#ifdef DEBUG |
| 333 |
– |
if (!nchild) |
| 334 |
– |
fprintf(stderr, "\r%.9f remaining...", total_rem); |
| 335 |
– |
#endif |
| 322 |
|
} while ((total_rem > end_thresh) & (move_amt > 0)); |
| 323 |
< |
#ifdef DEBUG |
| 338 |
< |
if (!nchild) fputs("done.\n", stderr); |
| 339 |
< |
else fprintf(stderr, "finished with %.9f remaining\n", total_rem); |
| 340 |
< |
#endif |
| 323 |
> |
|
| 324 |
|
for (i = from_rbf->nrbf; i--; ) { /* normalize final matrix */ |
| 325 |
< |
float nf = rbf_volume(&from_rbf->rbfa[i]); |
| 343 |
< |
int j; |
| 325 |
> |
double nf = rbf_volume(&from_rbf->rbfa[i]); |
| 326 |
|
if (nf <= FTINY) continue; |
| 327 |
|
nf = from_rbf->vtotal / nf; |
| 328 |
|
for (j = to_rbf->nrbf; j--; ) |
| 329 |
< |
mtx_coef(newmig,i,j) *= nf; |
| 329 |
> |
mtx_coef(newmig,i,j) *= nf; /* row now sums to 1.0 */ |
| 330 |
|
} |
| 331 |
|
end_subprocess(); /* exit here if subprocess */ |
| 332 |
< |
free(pmtx); /* free working arrays */ |
| 332 |
> |
free_routes(&pmtx); /* free working arrays */ |
| 333 |
|
free(src_rem); |
| 334 |
|
free(dst_rem); |
| 335 |
|
return(newmig); |
