Enum CommitTier 

pub enum CommitTier {
    None,
    Ordered,
    Durable,
}

Synchronization strength for one commit.

This setting has no effect unless DurabilityMode::Durable is selected. In the default DurabilityMode::Derived mode it is ignored entirely and no synchronization primitive is issued, including when this value is Ordered or Durable.

Variants

None

Buffer writes without synchronization; the page cache covers an application crash, but not a power cut.

Ordered

Order earlier writes before later writes with the platform barrier.

This default tier chooses a cheaper median than full durability on the measured development device, with a materially wider latency tail: barrier p95 varied 7.40x while full-sync p95 varied 1.02x. That spread is a device property, not buffering or timing behavior in this code.

Durable

Flush writes through to durable media with the platform full sync. Its measured 4 KiB median was 20.8x the ordered barrier median, but its latency distribution was substantially more stable on the same device.

Trait Implementations

impl Clone for CommitTier

fn clone(&self) -> CommitTier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CommitTier

impl Debug for CommitTier

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

Formats the value using the given formatter.

impl Default for CommitTier

fn default() -> CommitTier

Returns the “default value” for a type.

impl Eq for CommitTier

impl PartialEq for CommitTier

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CommitTier