33 lines
1.2 KiB
Rust
33 lines
1.2 KiB
Rust
/// The tunable settings for the runtime.
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pub struct RuntimeConfig {
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pub max_actors: usize,
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pub channel_buffer_size: usize,
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pub num_threads: usize,
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/// Maximum messages processed per actor per tick.
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/// Prevents a single actor with a large mailbox from starving others.
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/// `0` means unlimited (drain entire mailbox).
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pub actor_message_budget: usize,
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}
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/// 8kB for the `Box<..>` before counting the rest of the memory
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const DEFAULT_MAX_ACTORS: usize = 1_000;
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/// Pre-allocated ring buffer capacity for each channel (transfer, spawn, inbox).
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/// When the ring is full, messages overflow into an unbounded backup queue.
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const DEFAULT_CHANNEL_BUFFER_SIZE: usize = 1_000;
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/// Default per-actor message budget per tick.
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/// Inspired by BEAM's reduction budget (4000) and tokio's cooperative budget (128).
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/// 64 is a good default: high enough for throughput, low enough for fairness.
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const DEFAULT_ACTOR_MESSAGE_BUDGET: usize = 64;
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impl Default for RuntimeConfig {
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fn default() -> Self {
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Self {
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max_actors: DEFAULT_MAX_ACTORS,
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channel_buffer_size: DEFAULT_CHANNEL_BUFFER_SIZE,
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num_threads: 1,
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actor_message_budget: DEFAULT_ACTOR_MESSAGE_BUDGET,
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}
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}
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}
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