ISCreateBlock
Creates a data structure for an index set containing a list of integers. The indices are relative to entries, not blocks.
Synopsis
int ISCreateBlock(MPI_Comm comm,int bs,int n,const int idx[],IS *is)
Collective on MPI_Comm
Input Parameters
n | - the length of the index set (the number of blocks)
|
bs | - number of elements in each block
|
idx | - the list of integers
|
comm | - the MPI communicator
|
Output Parameter
is -the new index set
Notes
When the communicator is not MPI_COMM_SELF, the operations on the
index sets, IS, are NOT conceptually the same as MPI_Group operations.
The index sets are then distributed sets of indices.
Example
If you wish to index the values {0,1,4,5}, then use
a block size of 2 and idx of {0,4}.
Keywords
IS, index set, create, block
See Also
ISCreateStride(), ISCreateGeneral(), ISAllGather()
Level:beginner
Location:src/vec/is/impls/block/block.c
Index Set
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