Enum PrefetchMode 

pub enum PrefetchMode {
    Off,
    Sequential,
    WillNeed,
    Auto,
}

Selects the read-ahead hint applied to the active disk-access backend.

See StorageConfig::prefetch. Sequential / WillNeed map to the corresponding madvise(2) advice on the mmap backend; on the direct-I/O backend any non-Off value enables the StorageConfig::direct_io_prefetch_bytes read-ahead window.

Variants

Off

No explicit prefetch hint; rely on default kernel behaviour.

Sequential

Hint sequential access (aggressive read-ahead, drop-behind).

WillNeed

Hint that the mapped/region bytes will be needed soon (eager fault-in).

Auto

Let the backend choose: sequential advice for mmap, windowed read-ahead for direct I/O.

Trait Implementations

impl Clone for PrefetchMode

fn clone(&self) -> PrefetchMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PrefetchMode

impl Debug for PrefetchMode

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

Formats the value using the given formatter.

impl Default for PrefetchMode

fn default() -> PrefetchMode

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for PrefetchMode

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for PrefetchMode

impl PartialEq for PrefetchMode

fn eq(&self, other: &PrefetchMode) -> 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 Serialize for PrefetchMode

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for PrefetchMode