Work Decomposition

The following classes are all defined within namespace HIPP::MPI.

class WorkDecomp
class WorkDecomp1D : public WorkDecomp
static std::pair<size_t, size_t> uniform_block(size_t gsize, size_t n_blocks, size_t rank) noexcept

Decompose 1-d domain into uniform-distributed blocks.

Parameters

  • gsize – global domain size, i.e., size to be decomposed.

  • n_blocks – number of of blocks.

  • rank – the rank of the target block. “rank” must be in the range [0, n_blocks).

Returns

beginning and ending indices [b, e) of the target block are returned.

Example: gsize = 21, n_blocks = 6. Then, for different rank, the result is

rank

returned values

0

0, 4

1

4, 8

2

8, 12

3

12, 15

4

15, 18

5

18, 21

The first three blocks has size 4, and the last three blocks has size 3.