Enum ThreadingOptions 

pub enum ThreadingOptions {
    Auto,
    Fixed(usize),
    Single,
}

How many worker threads a table-parallel scan may use.

Variants

Auto

Use available parallelism, capped by the number of table files.

Fixed(usize)

Use an explicit worker count in 1..=512.

Single

Force one worker.

Implementations

impl ThreadingOptions

pub fn resolve(self, work_items: usize) -> usize

Resolves this setting to a concrete worker count.

pub fn resolve_unchecked(self, work_items: usize) -> usize

Resolves this setting without returning validation errors.

pub fn resolve_checked(self, work_items: usize) -> Result<usize>

Resolves this setting and rejects invalid fixed worker counts.

Errors

Returns LevelDbError::InvalidArgument when Fixed(0) or a value above 512 is requested.

Trait Implementations

impl Clone for ThreadingOptions

fn clone(&self) -> ThreadingOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ThreadingOptions

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

Formats the value using the given formatter.

impl Default for ThreadingOptions

fn default() -> ThreadingOptions

Returns the “default value” for a type.

impl PartialEq for ThreadingOptions

fn eq(&self, other: &ThreadingOptions) -> 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 Copy for ThreadingOptions

impl Eq for ThreadingOptions

impl StructuralPartialEq for ThreadingOptions