Determine a correct value for the block.size parameter

Source: R/utils.R

It determines the value of block.size such that a matrix of doubles of size n x block.size takes less memory than getOption("bigstatsr.block.sizeGB") GigaBytes (default is 1GB).

block_size(n, ncores = 1)

Arguments

n

The number of rows.

ncores

The number of cores.

Value

An integer >= 1.

Examples

block_size(1e3)
#> [1] 134217
block_size(1e6)
#> [1] 134
block_size(1e6, 6)
#> [1] 22