| 27 |
|
int nrows, ncols; /* array size (matches migration) */ |
| 28 |
|
float *price; /* migration prices */ |
| 29 |
|
short *sord; /* sort for each row, low to high */ |
| 30 |
+ |
float *prow; /* current price row */ |
| 31 |
|
} PRICEMAT; /* sorted pricing matrix */ |
| 32 |
|
|
| 33 |
|
#define pricerow(p,i) ((p)->price + (i)*(p)->ncols) |
| 120 |
|
if (pid < 0) { |
| 121 |
|
fprintf(stderr, "%s: cannot fork subprocess\n", |
| 122 |
|
progname); |
| 123 |
+ |
await_children(nchild); |
| 124 |
|
exit(1); |
| 125 |
|
} |
| 126 |
|
++nchild; /* subprocess started */ |
| 140 |
|
msrt_cmp(void *b, const void *p1, const void *p2) |
| 141 |
|
{ |
| 142 |
|
PRICEMAT *pm = (PRICEMAT *)b; |
| 143 |
< |
int ri = ((const short *)p1 - pm->sord) / pm->ncols; |
| 144 |
< |
float c1 = pricerow(pm,ri)[*(const short *)p1]; |
| 143 |
< |
float c2 = pricerow(pm,ri)[*(const short *)p2]; |
| 143 |
> |
float c1 = pm->prow[*(const short *)p1]; |
| 144 |
> |
float c2 = pm->prow[*(const short *)p2]; |
| 145 |
|
|
| 146 |
|
if (c1 > c2) return(1); |
| 147 |
|
if (c1 < c2) return(-1); |
| 171 |
|
for (i = from_rbf->nrbf; i--; ) { |
| 172 |
|
const double from_ang = R2ANG(from_rbf->rbfa[i].crad); |
| 173 |
|
FVECT vfrom; |
| 174 |
+ |
short *srow; |
| 175 |
|
ovec_from_pos(vfrom, from_rbf->rbfa[i].gx, from_rbf->rbfa[i].gy); |
| 176 |
+ |
pm->prow = pricerow(pm,i); |
| 177 |
+ |
srow = psortrow(pm,i); |
| 178 |
|
for (j = to_rbf->nrbf; j--; ) { |
| 179 |
< |
pricerow(pm,i)[j] = acos(DOT(vfrom, vto[j])) + |
| 179 |
> |
double dprod = DOT(vfrom, vto[j]); |
| 180 |
> |
pm->prow[j] = ((dprod >= 1.) ? .0 : acos(dprod)) + |
| 181 |
|
fabs(R2ANG(to_rbf->rbfa[j].crad) - from_ang); |
| 182 |
< |
psortrow(pm,i)[j] = j; |
| 182 |
> |
srow[j] = j; |
| 183 |
|
} |
| 184 |
< |
qsort_r(psortrow(pm,i), pm->ncols, sizeof(short), pm, &msrt_cmp); |
| 184 |
> |
qsort_r(srow, pm->ncols, sizeof(short), pm, &msrt_cmp); |
| 185 |
|
} |
| 186 |
|
free(vto); |
| 187 |
|
} |
| 198 |
|
static double |
| 199 |
|
min_cost(double amt2move, const double *avail, const PRICEMAT *pm, int s) |
| 200 |
|
{ |
| 201 |
+ |
const short *srow = psortrow(pm,s); |
| 202 |
+ |
const float *prow = pricerow(pm,s); |
| 203 |
|
double total_cost = 0; |
| 204 |
|
int j; |
| 198 |
– |
|
| 199 |
– |
if (amt2move <= FTINY) /* pre-emptive check */ |
| 200 |
– |
return(0.); |
| 205 |
|
/* move cheapest first */ |
| 206 |
< |
for (j = 0; j < pm->ncols && amt2move > FTINY; j++) { |
| 207 |
< |
int d = psortrow(pm,s)[j]; |
| 206 |
> |
for (j = 0; (j < pm->ncols) & (amt2move > FTINY); j++) { |
| 207 |
> |
int d = srow[j]; |
| 208 |
|
double amt = (amt2move < avail[d]) ? amt2move : avail[d]; |
| 209 |
|
|
| 210 |
< |
total_cost += amt * pricerow(pm,s)[d]; |
| 210 |
> |
total_cost += amt * prow[d]; |
| 211 |
|
amt2move -= amt; |
| 212 |
|
} |
| 213 |
|
return(total_cost); |
| 214 |
|
} |
| 215 |
|
|
| 216 |
< |
/* Take a step in migration by choosing optimal bucket to transfer */ |
| 216 |
> |
/* Compare entries by moving price */ |
| 217 |
> |
static int |
| 218 |
> |
rmovcmp(void *b, const void *p1, const void *p2) |
| 219 |
> |
{ |
| 220 |
> |
PRICEMAT *pm = (PRICEMAT *)b; |
| 221 |
> |
const short *ij1 = (const short *)p1; |
| 222 |
> |
const short *ij2 = (const short *)p2; |
| 223 |
> |
float price_diff; |
| 224 |
> |
|
| 225 |
> |
if (ij1[1] < 0) return(ij2[1] >= 0); |
| 226 |
> |
if (ij2[1] < 0) return(-1); |
| 227 |
> |
price_diff = pricerow(pm,ij1[0])[ij1[1]] - pricerow(pm,ij2[0])[ij2[1]]; |
| 228 |
> |
if (price_diff > 0) return(1); |
| 229 |
> |
if (price_diff < 0) return(-1); |
| 230 |
> |
return(0); |
| 231 |
> |
} |
| 232 |
> |
|
| 233 |
> |
/* Take a step in migration by choosing reasonable bucket to transfer */ |
| 234 |
|
static double |
| 235 |
< |
migration_step(MIGRATION *mig, double *src_rem, double *dst_rem, const PRICEMAT *pm) |
| 235 |
> |
migration_step(MIGRATION *mig, double *src_rem, double *dst_rem, PRICEMAT *pm) |
| 236 |
|
{ |
| 237 |
+ |
const int max2check = 100; |
| 238 |
|
const double maxamt = 1./(double)pm->ncols; |
| 239 |
|
const double minamt = maxamt*5e-6; |
| 240 |
< |
static double *src_cost = NULL; |
| 241 |
< |
static int n_alloc = 0; |
| 240 |
> |
double *src_cost; |
| 241 |
> |
short (*rord)[2]; |
| 242 |
|
struct { |
| 243 |
|
int s, d; /* source and destination */ |
| 244 |
|
double price; /* price estimate per amount moved */ |
| 245 |
|
double amt; /* amount we can move */ |
| 246 |
|
} cur, best; |
| 247 |
< |
int i; |
| 248 |
< |
|
| 249 |
< |
if (pm->nrows > n_alloc) { /* allocate cost array */ |
| 250 |
< |
if (n_alloc) |
| 251 |
< |
free(src_cost); |
| 252 |
< |
src_cost = (double *)malloc(sizeof(double)*pm->nrows); |
| 253 |
< |
if (src_cost == NULL) { |
| 254 |
< |
fprintf(stderr, "%s: Out of memory in migration_step()\n", |
| 255 |
< |
progname); |
| 256 |
< |
exit(1); |
| 257 |
< |
} |
| 258 |
< |
n_alloc = pm->nrows; |
| 247 |
> |
int r2check, i, ri; |
| 248 |
> |
/* |
| 249 |
> |
* Check cheapest available routes only -- a higher adjusted |
| 250 |
> |
* destination price implies that another source is closer, so |
| 251 |
> |
* we can hold off considering more expensive options until |
| 252 |
> |
* some other (hopefully better) moves have been made. |
| 253 |
> |
*/ |
| 254 |
> |
/* most promising row order */ |
| 255 |
> |
rord = (short (*)[2])malloc(sizeof(short)*2*pm->nrows); |
| 256 |
> |
if (rord == NULL) |
| 257 |
> |
goto memerr; |
| 258 |
> |
for (ri = pm->nrows; ri--; ) { |
| 259 |
> |
rord[ri][0] = ri; |
| 260 |
> |
rord[ri][1] = -1; |
| 261 |
> |
if (src_rem[ri] <= minamt) /* enough source material? */ |
| 262 |
> |
continue; |
| 263 |
> |
for (i = 0; i < pm->ncols; i++) |
| 264 |
> |
if (dst_rem[ rord[ri][1] = psortrow(pm,ri)[i] ] > minamt) |
| 265 |
> |
break; |
| 266 |
> |
if (i >= pm->ncols) { /* moved all we can? */ |
| 267 |
> |
free(rord); |
| 268 |
> |
return(.0); |
| 269 |
> |
} |
| 270 |
|
} |
| 271 |
+ |
if (pm->nrows > max2check) /* sort if too many sources */ |
| 272 |
+ |
qsort_r(rord, pm->nrows, sizeof(short)*2, pm, &rmovcmp); |
| 273 |
+ |
/* allocate cost array */ |
| 274 |
+ |
src_cost = (double *)malloc(sizeof(double)*pm->nrows); |
| 275 |
+ |
if (src_cost == NULL) |
| 276 |
+ |
goto memerr; |
| 277 |
|
for (i = pm->nrows; i--; ) /* starting costs for diff. */ |
| 278 |
|
src_cost[i] = min_cost(src_rem[i], dst_rem, pm, i); |
| 240 |
– |
|
| 279 |
|
/* find best source & dest. */ |
| 280 |
|
best.s = best.d = -1; best.price = FHUGE; best.amt = 0; |
| 281 |
< |
for (cur.s = pm->nrows; cur.s--; ) { |
| 281 |
> |
if ((r2check = pm->nrows) > max2check) |
| 282 |
> |
r2check = max2check; /* put a limit on search */ |
| 283 |
> |
for (ri = 0; ri < r2check; ri++) { /* check each source row */ |
| 284 |
|
double cost_others = 0; |
| 285 |
< |
if (src_rem[cur.s] <= minamt) |
| 286 |
< |
continue; |
| 287 |
< |
/* examine cheapest dest. */ |
| 288 |
< |
for (i = 0; i < pm->ncols; i++) |
| 289 |
< |
if (dst_rem[cur.d = psortrow(pm,cur.s)[i]] > minamt) |
| 290 |
< |
break; |
| 251 |
< |
if (i >= pm->ncols) |
| 252 |
< |
return(.0); |
| 253 |
< |
if ((cur.price = pricerow(pm,cur.s)[cur.d]) >= best.price) |
| 254 |
< |
continue; /* no point checking further */ |
| 285 |
> |
cur.s = rord[ri][0]; |
| 286 |
> |
if ((cur.d = rord[ri][1]) < 0 || |
| 287 |
> |
(cur.price = pricerow(pm,cur.s)[cur.d]) >= best.price) { |
| 288 |
> |
if (pm->nrows > max2check) break; /* sorted end */ |
| 289 |
> |
continue; /* else skip this one */ |
| 290 |
> |
} |
| 291 |
|
cur.amt = (src_rem[cur.s] < dst_rem[cur.d]) ? |
| 292 |
|
src_rem[cur.s] : dst_rem[cur.d]; |
| 293 |
< |
if (cur.amt > maxamt) cur.amt = maxamt; |
| 294 |
< |
dst_rem[cur.d] -= cur.amt; /* add up differential costs */ |
| 293 |
> |
/* don't just leave smidgen */ |
| 294 |
> |
if (cur.amt > maxamt*1.02) cur.amt = maxamt; |
| 295 |
> |
dst_rem[cur.d] -= cur.amt; /* add up opportunity costs */ |
| 296 |
|
for (i = pm->nrows; i--; ) |
| 297 |
|
if (i != cur.s) |
| 298 |
< |
cost_others += min_cost(src_rem[i], dst_rem, pm, i) |
| 298 |
> |
cost_others += min_cost(src_rem[i], dst_rem, pm, i) |
| 299 |
|
- src_cost[i]; |
| 300 |
|
dst_rem[cur.d] += cur.amt; /* undo trial move */ |
| 301 |
|
cur.price += cost_others/cur.amt; /* adjust effective price */ |
| 302 |
|
if (cur.price < best.price) /* are we better than best? */ |
| 303 |
< |
best = cur; |
| 303 |
> |
best = cur; |
| 304 |
|
} |
| 305 |
< |
if ((best.s < 0) | (best.d < 0)) |
| 305 |
> |
free(src_cost); /* clean up */ |
| 306 |
> |
free(rord); |
| 307 |
> |
if ((best.s < 0) | (best.d < 0)) /* nothing left to move? */ |
| 308 |
|
return(.0); |
| 309 |
< |
/* make the actual move */ |
| 309 |
> |
/* else make the actual move */ |
| 310 |
|
mtx_coef(mig,best.s,best.d) += best.amt; |
| 311 |
|
src_rem[best.s] -= best.amt; |
| 312 |
|
dst_rem[best.d] -= best.amt; |
| 313 |
|
return(best.amt); |
| 314 |
+ |
memerr: |
| 315 |
+ |
fprintf(stderr, "%s: Out of memory in migration_step()\n", progname); |
| 316 |
+ |
exit(1); |
| 317 |
|
} |
| 318 |
|
|
| 277 |
– |
#ifdef DEBUG |
| 278 |
– |
static char * |
| 279 |
– |
thetaphi(const FVECT v) |
| 280 |
– |
{ |
| 281 |
– |
static char buf[128]; |
| 282 |
– |
double theta, phi; |
| 283 |
– |
|
| 284 |
– |
theta = 180./M_PI*acos(v[2]); |
| 285 |
– |
phi = 180./M_PI*atan2(v[1],v[0]); |
| 286 |
– |
sprintf(buf, "(%.0f,%.0f)", theta, phi); |
| 287 |
– |
|
| 288 |
– |
return(buf); |
| 289 |
– |
} |
| 290 |
– |
#endif |
| 291 |
– |
|
| 319 |
|
/* Compute and insert migration along directed edge (may fork child) */ |
| 320 |
|
static MIGRATION * |
| 321 |
|
create_migration(RBFNODE *from_rbf, RBFNODE *to_rbf) |
| 325 |
|
MIGRATION *newmig; |
| 326 |
|
double *src_rem, *dst_rem; |
| 327 |
|
double total_rem = 1., move_amt; |
| 328 |
< |
int i; |
| 328 |
> |
int i, j; |
| 329 |
|
/* check if exists already */ |
| 330 |
|
for (newmig = from_rbf->ejl; newmig != NULL; |
| 331 |
|
newmig = nextedge(from_rbf,newmig)) |
| 332 |
|
if (newmig->rbfv[1] == to_rbf) |
| 333 |
|
return(NULL); |
| 334 |
|
/* else allocate */ |
| 335 |
+ |
#ifdef DEBUG |
| 336 |
+ |
fprintf(stderr, "Building path from (theta,phi) (%.0f,%.0f) ", |
| 337 |
+ |
get_theta180(from_rbf->invec), |
| 338 |
+ |
get_phi360(from_rbf->invec)); |
| 339 |
+ |
fprintf(stderr, "to (%.0f,%.0f) with %d x %d matrix\n", |
| 340 |
+ |
get_theta180(to_rbf->invec), |
| 341 |
+ |
get_phi360(to_rbf->invec), |
| 342 |
+ |
from_rbf->nrbf, to_rbf->nrbf); |
| 343 |
+ |
#endif |
| 344 |
|
newmig = new_migration(from_rbf, to_rbf); |
| 345 |
|
if (run_subprocess()) |
| 346 |
|
return(newmig); /* child continues */ |
| 352 |
|
progname); |
| 353 |
|
exit(1); |
| 354 |
|
} |
| 319 |
– |
#ifdef DEBUG |
| 320 |
– |
fprintf(stderr, "Building path from (theta,phi) %s ", |
| 321 |
– |
thetaphi(from_rbf->invec)); |
| 322 |
– |
fprintf(stderr, "to %s with %d x %d matrix\n", |
| 323 |
– |
thetaphi(to_rbf->invec), |
| 324 |
– |
from_rbf->nrbf, to_rbf->nrbf); |
| 325 |
– |
#endif |
| 355 |
|
/* starting quantities */ |
| 356 |
|
memset(newmig->mtx, 0, sizeof(float)*from_rbf->nrbf*to_rbf->nrbf); |
| 357 |
|
for (i = from_rbf->nrbf; i--; ) |
| 358 |
|
src_rem[i] = rbf_volume(&from_rbf->rbfa[i]) / from_rbf->vtotal; |
| 359 |
< |
for (i = to_rbf->nrbf; i--; ) |
| 360 |
< |
dst_rem[i] = rbf_volume(&to_rbf->rbfa[i]) / to_rbf->vtotal; |
| 359 |
> |
for (j = to_rbf->nrbf; j--; ) |
| 360 |
> |
dst_rem[j] = rbf_volume(&to_rbf->rbfa[j]) / to_rbf->vtotal; |
| 361 |
> |
|
| 362 |
|
do { /* move a bit at a time */ |
| 363 |
|
move_amt = migration_step(newmig, src_rem, dst_rem, &pmtx); |
| 364 |
|
total_rem -= move_amt; |
| 335 |
– |
#ifdef DEBUG |
| 336 |
– |
if (!nchild) |
| 337 |
– |
fprintf(stderr, "\r%.9f remaining...", total_rem); |
| 338 |
– |
#endif |
| 365 |
|
} while ((total_rem > end_thresh) & (move_amt > 0)); |
| 366 |
< |
#ifdef DEBUG |
| 341 |
< |
if (!nchild) fputs("done.\n", stderr); |
| 342 |
< |
else fprintf(stderr, "finished with %.9f remaining\n", total_rem); |
| 343 |
< |
#endif |
| 366 |
> |
|
| 367 |
|
for (i = from_rbf->nrbf; i--; ) { /* normalize final matrix */ |
| 368 |
< |
float nf = rbf_volume(&from_rbf->rbfa[i]); |
| 346 |
< |
int j; |
| 368 |
> |
double nf = rbf_volume(&from_rbf->rbfa[i]); |
| 369 |
|
if (nf <= FTINY) continue; |
| 370 |
|
nf = from_rbf->vtotal / nf; |
| 371 |
|
for (j = to_rbf->nrbf; j--; ) |
| 372 |
< |
mtx_coef(newmig,i,j) *= nf; |
| 372 |
> |
mtx_coef(newmig,i,j) *= nf; /* row now sums to 1.0 */ |
| 373 |
|
} |
| 374 |
|
end_subprocess(); /* exit here if subprocess */ |
| 375 |
|
free_routes(&pmtx); /* free working arrays */ |
