Enum DiskAccessMode 

pub enum DiskAccessMode {
    Auto,
    Buffered,
    Mmap,
    Direct,
}

Selects which backend the SSTable read path uses for Data.db I/O.

See StorageConfig::disk_access_mode for the per-variant semantics and the DiskAccessMode::Auto sizing heuristic.

Variants

Auto

Size each file against system RAM and pick buffered / mmap / direct.

Buffered

Always use buffered file I/O through the OS page cache.

Mmap

Always memory-map the file. Unlike the DiskAccessMode::Auto heuristic, this honors the user’s explicit request and is not gated by StorageConfig::mmap_min_size_bytes (the size threshold only steers Auto); a zero-length file still falls back to buffered I/O since an empty map is invalid.

Direct

Always use direct I/O, bypassing the OS page cache.

Trait Implementations

impl Clone for DiskAccessMode

fn clone(&self) -> DiskAccessMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DiskAccessMode

impl Debug for DiskAccessMode

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

Formats the value using the given formatter.

impl Default for DiskAccessMode

fn default() -> DiskAccessMode

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DiskAccessMode

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for DiskAccessMode

impl PartialEq for DiskAccessMode

fn eq(&self, other: &DiskAccessMode) -> bool

Equality operator ==.

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

Inequality operator !=.

impl Serialize for DiskAccessMode

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 DiskAccessMode