Struct CachePadded 

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

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 invalidates 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, aarch64, and powerpc64, N = 128.
• On arm, mips, mips64, sparc, and hexagon, N = 32.
• On m68k, N = 16.
• On s390x, N = 256.
• 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.

Implementations

impl<T> CachePadded<T>

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

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

pub fn into_inner(self) -> T

Returns the inner value.

Trait Implementations

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

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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

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

Formats the value using the given formatter.

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

fn default() -> CachePadded<T>

Returns the “default value” for a type.

impl<T> Deref for CachePadded<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for CachePadded<T>

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

Mutably dereferences the value.

impl<T: Display> Display for CachePadded<T>

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

Formats the value using the given formatter.

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

fn from(t: T) -> Self

Converts to this type from the input type.

impl<T: Hash> Hash for CachePadded<T>

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

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

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Copy> Copy for CachePadded<T>

impl<T: Eq> Eq for CachePadded<T>

impl<T: Send> Send for CachePadded<T>

impl<T> StructuralPartialEq for CachePadded<T>

impl<T: Sync> Sync for CachePadded<T>