Get the Average Number of Free CPU Cores

freeCores(
  memory = c("5min", "15min", "1min"),
  fraction = 0.9,
  logical = getOption2("parallelly.availableCores.logical", TRUE),
  default = parallelly::availableCores()
)

Arguments

memory: (character) The time period used to infer the system load, with alternatives being 5 minutes (default), 15 minutes, or 1 minute.
fraction: (non-negative numeric) A scale factor.
logical: Passed as-is to availableCores().
default: (integer) The value to be returned if the system load is unknown, i.e. cpuLoad() return missing values.

Value

An positive integer with attributes loadavg (named numeric), maxCores (named integer), argument memory (character), and argument fraction (numeric).

Examples

free <- freeCores()
print(free)
#> [1] 6
#> attr(,"loadavg")
#>  1min  5min 15min 
#>  0.61  0.71  0.71 
#> attr(,"maxCores")
#> system 
#>      8 
#> attr(,"memory")
#> [1] "5min"
#> attr(,"fraction")
#> [1] 0.9

if (FALSE) {
## Make availableCores() agile to the system load
options(parallelly.availableCores.custom = function() freeCores())
}