Struct crossbeam_utils::CachePadded

pub struct CachePadded<T> { /* fields omitted */ }

Pads and aligns a value to the length of a cache line.

In concurrent programming, sometimes it is desirable to make sure commonly accessed pieces of data are not placed into the same cache line. Updating an atomic value invalides the whole cache line it belongs to, which makes the next access to the same cache line slower for other CPU cores. Use CachePadded to ensure updating one piece of data doesn't invalidate other cached data.

Size and alignment

Cache lines are assumed to be N bytes long, depending on the architecture:

• On x86-64, N = 128.
• On all others, N = 64.

Note that N is just a reasonable guess and is not guaranteed to match the actual cache line length of the machine the program is running on. On modern Intel architectures, spatial prefetcher is pulling pairs of 64-byte cache lines at a time, so we pessimistically assume that cache lines are 128 bytes long.

The size of CachePadded<T> is the smallest multiple of N bytes large enough to accommodate a value of type T.

The alignment of CachePadded<T> is the maximum of N bytes and the alignment of T.

Examples

Alignment and padding:

use crossbeam_utils::CachePadded;

let array = [CachePadded::new(1i8), CachePadded::new(2i8)];
let addr1 = &*array[0] as *const i8 as usize;
let addr2 = &*array[1] as *const i8 as usize;

assert!(addr2 - addr1 >= 64);
assert_eq!(addr1 % 64, 0);
assert_eq!(addr2 % 64, 0);

When building a concurrent queue with a head and a tail index, it is wise to place them in different cache lines so that concurrent threads pushing and popping elements don't invalidate each other's cache lines:

use crossbeam_utils::CachePadded;
use std::sync::atomic::AtomicUsize;

struct Queue<T> {
    head: CachePadded<AtomicUsize>,
    tail: CachePadded<AtomicUsize>,
    buffer: *mut T,
}

Methods

impl<T> CachePadded<T>

pub fn new(t: T) -> CachePadded<T>

Pads and aligns a value to the length of a cache line.

Examples

use crossbeam_utils::CachePadded;

let padded_value = CachePadded::new(1);

pub fn into_inner(self) -> T

Returns the inner value.

Examples

use crossbeam_utils::CachePadded;

let padded_value = CachePadded::new(7);
let value = padded_value.into_inner();
assert_eq!(value, 7);

Trait Implementations

impl<T: Clone> Clone for CachePadded<T>

fn clone(&self) -> CachePadded<T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Default> Default for CachePadded<T>

fn default() -> CachePadded<T>

Returns the "default value" for a type.

impl<T> From<T> for CachePadded<T>

fn from(t: T) -> Self

Performs the conversion.

impl<T: PartialEq> PartialEq<CachePadded<T>> for CachePadded<T>

fn eq(&self, other: &CachePadded<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &CachePadded<T>) -> bool

This method tests for !=.

impl<T: Sync> Sync for CachePadded<T>

impl<T: Copy> Copy for CachePadded<T>

impl<T: Send> Send for CachePadded<T>

impl<T: Eq> Eq for CachePadded<T>

impl<T> DerefMut for CachePadded<T>

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

impl<T> Deref for CachePadded<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T: Debug> Debug for CachePadded<T>

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T: Hash> Hash for CachePadded<T>

fn hash<__HT: Hasher>(&self, state: &mut __HT)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].