Group Management

int Group.Size()

returns:

number of processors in the group

Size of group. Java binding of the MPI operation MPI_GROUP_SIZE.

int Group.Rank()

returns:

rank of the calling process in the group

Rank of this process in group. Java binding of the MPI operation MPI_GROUP_RANK. Result value is MPI.UNDEFINED if this process is not a member of the group.

static int [] Group.Translate_ranks(Group group1, int [] ranks1,
                                    Group group2)

group1	first group
ranks1	array of valid ranks in group1
group2	second group
returns:	array of corresponding ranks in group2

Translate ranks within first group to ranks within second group. Java binding of the MPI operation MPI_GROUP_TRANSLATE_RANKS. Result elements are MPI.UNDEFINED where no correspondence exists.

static int Group.Compare(Group group1, Group group2)

group1	first group
group2	second group
returns:	result

Compare two groups. Java binding of the MPI operation MPI_GROUP_COMPARE. MPI.IDENT results if the group members and group order are exactly the same in both groups. MPI.SIMILAR results if the group members are the same but the order is different. MPI.UNEQUAL results otherwise.

Group Comm.Group()

returns:

group corresponding to this communicator

Return group associated with a communicator. Java binding of the MPI operation MPI_COMM_GROUP.

static Group Group.Union(Group group1, Group group2)

group1	first group
group2	second group
returns:	union group

Set union of two groups. Java binding of the MPI operation MPI_GROUP_UNION.

static Group Group.Intersection(Group group1, Group group2)

group1	first group
group2	second group
returns:	intersection group

Set intersection of two groups. Java binding of the MPI operation MPI_GROUP_INTERSECTION.

static Group Group.Difference(Group group1, Group group2)

group1	first group
group2	second group
returns:	difference group

Result contains all elements of the first group that are not in the second group. Java binding of the MPI operation MPI_GROUP_DIFFERENCE.

Group Group.Incl(int [] ranks)

ranks	ranks from this group to appear in new group
returns:	new group

Create a subset group including specified processes. Java binding of the MPI operation MPI_GROUP_INCL.

Group Group.Excl(int [] ranks)

ranks	ranks from this group not to appear in new group
returns:	new group

Create a subset group excluding specified processes. Java binding of the MPI operation MPI_GROUP_EXCL.

Group Group.Range_incl(int [] [] ranges)

ranges	array of integer triplets
returns:	new group

Create a subset group including processes specified by strided intervals of ranks. Java binding of the MPI operation MPI_GROUP_RANGE_INCL. The triplets are of the form $(\mbox{first rank}, \mbox{last rank}, \mbox{stride})$ indicating ranks in this group to be included in the new group. The size of the first dimension of ranges is the number of triplets. The size of the second dimension is 3.

Group Group.Range_excl(int [] [] ranges)

ranges	array of integer triplets
returns:	new group

Create a subset group excluding processes specified by strided intervals of ranks. Java binding of the MPI operation MPI_GROUP_RANGE_EXCL. Triplet array is defined as for Range_incl, the ranges indicating ranks in this group to be excluded from the new group.

void Group.finalize()

Destructor. Java binding of the MPI operation MPI_GROUP_FREE.