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548c626329
implements the first edition of the 'partitionUI' algorithm (i.e., before afg added sub-grid support in r2349), but it is nevertheless a useful experiment and facilitates testing a C/C++ implementation of the MsMFE method.
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
#include <assert.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "partition.h"
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#define MAX(a,b) (((a) > (b)) ? (a) : (b))
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/* ---------------------------------------------------------------------- */
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static void
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partition_coord_idx(int ndims, int idx, const int *size, int *cidx)
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/* ---------------------------------------------------------------------- */
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{
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int i;
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for (i = 0; i < ndims; i++) {
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cidx[i] = idx % size[i];
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idx /= size[i];
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}
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assert (idx == 0);
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}
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/* ---------------------------------------------------------------------- */
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static int
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partition_lin_idx(int ndims, const int *size, const int *cidx)
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/* ---------------------------------------------------------------------- */
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{
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int i, idx;
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idx = cidx[ndims - 1];
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for (i = ndims - 2; i >= 0; i--) {
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idx = cidx[i] + size[i]*idx;
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}
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return idx;
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}
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/* ---------------------------------------------------------------------- */
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/* Load-balanced linear distribution.
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*
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* See Eric F. Van de Velde, Concurrent Scientific Computing,
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* 1994, Springer Verlag, p. 54 (Sect. 2.3) for details. */
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static void
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partition_loadbal_lin_dist(int ndims, const int *size, const int *nbins,
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int *idx)
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/* ---------------------------------------------------------------------- */
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{
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int i, L, R, b1, b2;
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for (i = 0; i < ndims; i++) {
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L = size[i] / nbins[i]; /* # entities per bin */
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R = size[i] % nbins[i]; /* # bins containing one extra entity */
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b1 = idx[i] / (L + 1);
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b2 = (idx[i] - R) / L ;
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idx[i] = MAX(b1, b2);
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}
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}
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/* ---------------------------------------------------------------------- */
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int
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partition_unif_idx(int ndims, int nc,
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const int *fine_d, const int *coarse_d, const int *idx,
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int *p)
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/* ---------------------------------------------------------------------- */
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{
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int c, ret, *ix;
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ix = malloc(ndims * sizeof *ix);
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if (ix != NULL) {
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for (c = 0; c < nc; c++) {
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partition_coord_idx(ndims, idx[c], fine_d, ix);
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partition_loadbal_lin_dist(ndims, fine_d, coarse_d, ix);
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p[c] = partition_lin_idx(ndims, coarse_d, ix);
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}
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ret = nc;
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} else {
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ret = -1;
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}
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free(ix);
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return ret;
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}
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/* ---------------------------------------------------------------------- */
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int
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partition_compress(int n, int *p)
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/* ---------------------------------------------------------------------- */
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{
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int ret, i, max, *compr;
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max = -1;
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for (i = 0; i < n; i++) {
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assert (0 <= p[i]); /* Only non-neg partitions (for now?). */
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max = MAX(max, p[i]);
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}
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compr = calloc(max + 1, sizeof *compr);
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if (compr != NULL) {
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for (i = 0; i < n; i++) { compr[p[i]]++; }
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compr[0] = -1 + (compr[0] > 0);
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for (i = 1; i <= max; i++) {
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compr[i] = compr[i - 1] + (compr[i] > 0);
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}
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for (i = 0; i < n; i++) { p[i] = compr[p[i]]; }
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ret = compr[max];
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} else {
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ret = -1;
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}
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free(compr);
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return ret;
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}
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