Centralize decentralized timing constants

sdk/src/timing.rs

@@ -2,6 +2,13 @@
 use std::time::Duration;
 use std::time::{SystemTime, UNIX_EPOCH};
 
+pub const NUM_TICKS_PER_SECOND: usize = 10;
+
+// At 10 ticks/s, 8 ticks per slot implies that leader rotation and voting will happen
+// every 800 ms. A fast voting cadence ensures faster finality and convergence
+pub const DEFAULT_TICKS_PER_SLOT: u64 = 8;
+pub const DEFAULT_SLOTS_PER_EPOCH: u64 = 64;
+
 pub fn duration_as_us(d: &Duration) -> u64 {
     (d.as_secs() * 1000 * 1000) + (u64::from(d.subsec_nanos()) / 1_000)
 }

src/bank.rs

@@ -7,7 +7,6 @@ use crate::accounts::{Accounts, ErrorCounters, InstructionAccounts, InstructionL
 use crate::counter::Counter;
 use crate::genesis_block::GenesisBlock;
 use crate::last_id_queue::{LastIdQueue, MAX_ENTRY_IDS};
-use crate::poh_service::NUM_TICKS_PER_SECOND;
 use crate::status_cache::StatusCache;
 use bincode::{deserialize, serialize};
 use log::Level;
@@ -19,12 +18,11 @@ use solana_sdk::hash::{extend_and_hash, Hash};
 use solana_sdk::native_loader;
 use solana_sdk::native_program::ProgramError;
 use solana_sdk::pubkey::Pubkey;
-use solana_sdk::signature::Keypair;
-use solana_sdk::signature::Signature;
+use solana_sdk::signature::{Keypair, Signature};
 use solana_sdk::storage_program;
 use solana_sdk::system_program;
 use solana_sdk::system_transaction::SystemTransaction;
-use solana_sdk::timing::duration_as_us;
+use solana_sdk::timing::{duration_as_us, NUM_TICKS_PER_SECOND};
 use solana_sdk::token_program;
 use solana_sdk::transaction::Transaction;
 use solana_sdk::vote_program::{self, VoteState};

src/banking_stage.rs

@@ -18,8 +18,7 @@ use bincode::deserialize;
 use log::Level;
 use solana_sdk::hash::Hash;
 use solana_sdk::pubkey::Pubkey;
-use solana_sdk::timing;
-use solana_sdk::timing::duration_as_us;
+use solana_sdk::timing::{self, duration_as_us};
 use solana_sdk::transaction::Transaction;
 use std::sync::atomic::AtomicBool;
 use std::sync::mpsc::{channel, Receiver, RecvTimeoutError};
@@ -346,11 +345,11 @@ mod tests {
     use super::*;
     use crate::entry::EntrySlice;
     use crate::genesis_block::GenesisBlock;
-    use crate::leader_scheduler::DEFAULT_TICKS_PER_SLOT;
     use crate::packet::to_packets;
     use solana_sdk::native_program::ProgramError;
     use solana_sdk::signature::{Keypair, KeypairUtil};
     use solana_sdk::system_transaction::SystemTransaction;
+    use solana_sdk::timing::DEFAULT_TICKS_PER_SLOT;
     use std::thread::sleep;
 
     #[test]

src/blocktree.rs

@@ -4,7 +4,6 @@
 
 use crate::entry::Entry;
 use crate::genesis_block::GenesisBlock;
-use crate::leader_scheduler::DEFAULT_TICKS_PER_SLOT;
 use crate::packet::{Blob, SharedBlob, BLOB_HEADER_SIZE};
 use crate::result::{Error, Result};
 use bincode::{deserialize, serialize};
@@ -18,6 +17,7 @@ use serde::Serialize;
 use solana_sdk::hash::Hash;
 use solana_sdk::pubkey::Pubkey;
 use solana_sdk::signature::{Keypair, KeypairUtil};
+use solana_sdk::timing::DEFAULT_TICKS_PER_SLOT;
 use std::borrow::{Borrow, Cow};
 use std::cell::RefCell;
 use std::cmp;

src/last_id_queue.rs

@@ -1,7 +1,6 @@
-use crate::poh_service::NUM_TICKS_PER_SECOND;
 use hashbrown::HashMap;
 use solana_sdk::hash::Hash;
-use solana_sdk::timing::timestamp;
+use solana_sdk::timing::{timestamp, NUM_TICKS_PER_SECOND};
 
 /// The number of most recent `last_id` values that the bank will track the signatures
 /// of. Once the bank discards a `last_id`, it will reject any transactions that use

src/leader_scheduler.rs

@@ -11,15 +11,12 @@ use solana_sdk::hash::{hash, Hash};
 use solana_sdk::pubkey::Pubkey;
 use solana_sdk::signature::{Keypair, KeypairUtil};
 use solana_sdk::system_transaction::SystemTransaction;
+use solana_sdk::timing::{DEFAULT_SLOTS_PER_EPOCH, DEFAULT_TICKS_PER_SLOT};
 use solana_sdk::vote_program::VoteState;
 use solana_sdk::vote_transaction::VoteTransaction;
 use std::io::Cursor;
 use std::sync::Arc;
 
-// At 10 ticks/s, 8 ticks per slot implies that leader rotation and voting will happen
-// every 800 ms. A fast voting cadence ensures faster finality and convergence
-pub const DEFAULT_TICKS_PER_SLOT: u64 = 8;
-pub const DEFAULT_SLOTS_PER_EPOCH: u64 = 64;
 pub const DEFAULT_ACTIVE_WINDOW_TICK_LENGTH: u64 = DEFAULT_SLOTS_PER_EPOCH * DEFAULT_TICKS_PER_SLOT;
 
 #[derive(Clone)]

src/poh_service.rs

@@ -5,14 +5,12 @@ use crate::bank::Bank;
 use crate::poh_recorder::PohRecorder;
 use crate::result::Result;
 use crate::service::Service;
+use solana_sdk::timing::NUM_TICKS_PER_SECOND;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
-use std::thread::sleep;
-use std::thread::{self, Builder, JoinHandle};
+use std::thread::{self, sleep, Builder, JoinHandle};
 use std::time::Duration;
 
-pub const NUM_TICKS_PER_SECOND: usize = 10;
-
 #[derive(Copy, Clone)]
 pub enum PohServiceConfig {
     /// * `Tick` - Run full PoH thread.  Tick is a rough estimate of how many hashes to roll before

src/status_cache.rs

@@ -1,9 +1,9 @@
 use crate::bloom::{Bloom, BloomHashIndex};
 use crate::last_id_queue::MAX_ENTRY_IDS;
-use crate::poh_service::NUM_TICKS_PER_SECOND;
 use hashbrown::HashMap;
 use solana_sdk::hash::Hash;
 use solana_sdk::signature::Signature;
+use solana_sdk::timing::NUM_TICKS_PER_SECOND;
 use std::collections::VecDeque;
 use std::ops::{Deref, DerefMut};