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我已經使用OpenMP下面的C代碼:收起子句中的#pragma OMP被忽略
#pragma omp parallel default(none) private(i, j, k) shared(lb0, ub0, lb1, ub1, lb2, ub2, g, current, update, diff, dg)
#pragma omp for collapse(3)
for(i = lb0; i <= ub0; i++) {
for(j = lb1; j <= ub1; j++) {
for(k = lb2; k <= ub2; k++) {
g->data[ update ][ i ][ j ][ k ] =
ONE_SIXTH * (g->data[ current ][ i + 1 ][ j ][ k ] +
g->data[ current ][ i - 1 ][ j ][ k ] +
g->data[ current ][ i ][ j + 1 ][ k ] +
g->data[ current ][ i ][ j - 1 ][ k ] +
g->data[ current ][ i ][ j ][ k + 1 ] +
g->data[ current ][ i ][ j ][ k - 1 ]);
diff = fabs(g->data[ update ][ i ][ j ][ k ] - g->data[ current ][ i ][ j ][ k ]);
dg = dg > diff ? dg : diff;
}
}
}
據我所知,我下面使用崩潰子句將#pragma OMP規則爲指令,但是當我編譯它時,我得到以下錯誤:
grid.c: In function ‘grid_update’:
grid.c:202: error: expected ‘#pragma omp’ clause before ‘collapse’
make: *** [grid.o] Error 1
我在做什麼錯在這裏?我試過把#pragma omp collapse
作爲一個單獨的指令,但那也行不通。
在OpenMP V3.0規範中添加了摺疊。 gcc文檔顯示,直到gcc版本4.4才支持OpenMP V3.0。 – ejd 2011-05-04 14:37:30
謝謝你們 - 完全正確。現在只是要獾我的系統管理員升級! – robintw 2011-05-04 17:33:42