| NAME |
| SCI_Group_create - Create a new group from a back end list |
| |
| C Syntax |
| #include <sci.h> |
| int SCI_Group_create(int num_bes, int *be_list, sci_group_t *group) |
| |
| INPUT PARAMETERS |
| num_bes |
| Number of back ends in the new group (IN). |
| be_list |
| The back end id list of the new group (IN). |
| group |
| The output group (OUT). |
| |
| DESCRIPTION |
| This subroutine is used to create a new group from a back end list, the list |
| contains existed back end ids. The new group can be used for SCI_Bcast to |
| specify destination receivers. |
| |
| This is a blocking call. The caller can assume group is ready to use upon the |
| return of the function. |
| |
| For more information, please refer to SCI's online documents. |
| |
| EXAMPLE |
| { |
| int i, num_bes; |
| sci_group_t odd_group, even_group; |
| int odd_size, even_size; |
| ... |
| SCI_Query(NUM_BACKENDS, &num_bes); |
| |
| odd_size = (num_bes - num_bes%2) / 2; |
| odd_list = (int *)malloc(sizeof(int) * odd_size); |
| for (i=0; i<odd_size; i++) { |
| odd_list[i] = i*2 + 1; |
| } |
| SCI_Group_create(odd_size, odd_list, &odd_group); |
| |
| even_size = (num_bes + num_bes%2) / 2; |
| even_list = (int *)malloc(sizeof(int) * even_size); |
| for (i=0; i<even_size; i++) { |
| even_list[i] = i*2; |
| } |
| SCI_Group_create(even_size, even_list, &even_group); |
| } |
| |
| ERRORS |
| All SCI routines return an error value. |
| |
| SCI_ERR_UNINTIALIZED |
| Uninitialized SCI execution environment |
| SCI_ERR_INVALID_CALLER |
| Can only be called in the front end |
| SCI_ERR_BACKEND_NOTFOUND |
| The back end id list contains non-existed back end id |
| SCI_ERR_NO_MEM |
| Out of memory |
| |
| SEE ALSO |
| SCI_Group_free(3) |
| SCI_Group_operate(3) |
| SCI_Group_operate_ext(3) |
