Crate cpulist 

Utilities for parsing and emitting strings in the the cpulist format often used by Linux utilities that work with processor IDs, memory region IDs and similar numeric hardware identifiers.

Example cpulist string: 0-9,32-35,40

This is part of the Folo project that provides mechanisms for high-performance hardware-aware programming in Rust.

Format

The value is a comma-separated list of zero or more integers or integer ranges, where each item is either:

• a single integer (e.g. 1)
• a range of integers (e.g. 2-4)
• a range of integers with a stride (step size) operator (e.g. 5-9:2 which is equivalent to 5,7,9)

Whitespace or extra characters are not allowed anywhere in the string.

The identifiers in the list are of size u32.

Example

Basic conversion from/to strings:

let selected_processors = cpulist::parse("0-9,32-35,40").unwrap();
assert_eq!(
    selected_processors,
    vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 32, 33, 34, 35, 40]
);

println!("Selected processors: {selected_processors:?}");
println!("As cpulist: {}", cpulist::emit(selected_processors));

The stride operator is also supported for parsing:

let evens = cpulist::parse("0-16:2").unwrap();
let odds = cpulist::parse("1-16:2").unwrap();

let all = cpulist::emit(odds.iter().chain(evens.iter()).copied());

println!("Evens: {evens:?}");
println!("Odds: {odds:?}");

println!("All as cpulist: {all}");

Enums

Error

Errors that can occur when processing cpulist strings.

Functions

emit

Generates a cpulist in a format that can be parsed by parse().

parse

Parses a cpulist and returns the numeric items in ascending order, removing duplicates.