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EvictionPolicyType

featherdb_storage

Enum EvictionPolicyType 

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pub enum EvictionPolicyType {
    Clock,
    Lru2,
    Lirs,
}
Expand description

Buffer pool eviction policy type

Different eviction policies offer different trade-offs:

  • Clock: Simple, fast, good for general workloads
  • LRU-2: Better scan resistance (5-15% higher hit rate for mixed workloads)
  • LIRS: Best for workloads with varying access patterns

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Clock

Clock algorithm (second-chance) - simple and fast

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Lru2

LRU-2 algorithm - tracks last 2 access times for scan resistance

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Lirs

LIRS algorithm - adapts to workload patterns

Trait Implementations§

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impl Clone for EvictionPolicyType

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fn clone(&self) -> EvictionPolicyType

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for EvictionPolicyType

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

Formats the value using the given formatter. Read more
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impl Default for EvictionPolicyType

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fn default() -> EvictionPolicyType

Returns the “default value” for a type. Read more
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impl EvictionPolicyFactory for EvictionPolicyType

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fn create(&self, capacity: usize) -> Box<dyn EvictionPolicy>

Create an eviction policy of this type

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impl PartialEq for EvictionPolicyType

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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

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impl Eq for EvictionPolicyType

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impl StructuralPartialEq for EvictionPolicyType

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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where Self: Binary,

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where Self: Display,

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where Self: LowerExp,

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where Self: LowerHex,

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where Self: Octal,

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where Self: Pointer,

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where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

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fn from(t: T) -> T

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

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