base.minctxt: Get BLACS Context Grid Information

In RBigData/pbdBASE: Programming with Big Data -- Base Wrappers for Distributed Matrices

Description

Finds the smallest integers for creating a new BLACS context.

Usage

base.minctxt(after = 0)

Arguments

after

ignores all values below this integer as possibilities

Details

For advanced users only. See pbdDMAT for high-level functions.

Returns the smallest integer which could become a new BLACS context value.

For example, if contexts 0, 1, and 2 are taken, and after=0, then the function returns 3. If 0, 1, 2, and 5 are taken, the function returns 3 if after=0, but returns 6 if after=4.

The function is useful when a transitory grid is needed, such as for reading in data onto a subset of processors before distributing out to the full grid.

Value

Returns the minimum value.

RBigData/pbdBASE documentation built on Oct. 29, 2021, 6:19 p.m.