52 lines
1.5 KiB
Rust
52 lines
1.5 KiB
Rust
|
/// Backoff policy for worker threads when idle.
|
||
|
|
///
|
||
|
|
/// Workers spin → yield → sleep with increasing delay when no work is available.
|
||
|
|
pub struct BackoffPolicy {
|
||
|
|
/// Number of idle ticks before switching from spin to yield.
|
||
|
|
pub spin_threshold: u32,
|
||
|
|
/// Number of idle ticks before switching from yield to sleep.
|
||
|
|
pub yield_threshold: u32,
|
||
|
|
/// Microseconds added per tick beyond the yield threshold.
|
||
|
|
pub sleep_increment_us: u64,
|
||
|
|
/// Maximum sleep duration in microseconds.
|
||
|
|
pub sleep_max_us: u64,
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Default for BackoffPolicy {
|
||
|
|
fn default() -> Self {
|
||
|
|
Self {
|
||
|
|
spin_threshold: 64,
|
||
|
|
yield_threshold: 256,
|
||
|
|
sleep_increment_us: 50,
|
||
|
|
sleep_max_us: 1000,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// The tunable settings for the runtime.
|
||
|
|
pub struct RuntimeConfig {
|
||
|
|
pub max_actors: usize,
|
||
|
|
pub actor_max_messages: usize,
|
||
|
|
pub num_threads: usize,
|
||
|
|
pub backoff_policy: BackoffPolicy,
|
||
|
|
}
|
||
|
|
|
||
|
|
/// 8kB for the `Box<..>` before counting the rest of the memory
|
||
|
|
const DEFAULT_MAX_ACTORS: usize = 1_000;
|
||
|
|
|
||
|
|
/// 16kB PER ACTOR to alloc space for storing messages.
|
||
|
|
/// With default setting of [DEFAULT_MAX_ACTORS] this is:
|
||
|
|
/// 1_000 * 16kB = 16MB
|
||
|
|
const DEFAULT_ACTOR_MAX_MESSAGES: usize = 1_000;
|
||
|
|
|
||
|
|
impl Default for RuntimeConfig {
|
||
|
|
fn default() -> Self {
|
||
|
|
Self {
|
||
|
|
max_actors: DEFAULT_MAX_ACTORS,
|
||
|
|
actor_max_messages: DEFAULT_ACTOR_MAX_MESSAGES,
|
||
|
|
num_threads: 1,
|
||
|
|
backoff_policy: BackoffPolicy::default(),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|