132 lines
4.0 KiB
Rust
132 lines
4.0 KiB
Rust
use crate::accounts_index::{AccountsIndexConfig, IndexValue};
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use crate::bucket_map_holder::BucketMapHolder;
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use crate::in_mem_accounts_index::InMemAccountsIndex;
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use crate::waitable_condvar::WaitableCondvar;
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use std::fmt::Debug;
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use std::{
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sync::{
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atomic::{AtomicBool, Ordering},
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Arc, Mutex,
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},
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thread::{Builder, JoinHandle},
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};
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/// Manages the lifetime of the background processing threads.
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pub struct AccountsIndexStorage<T: IndexValue> {
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_bg_threads: BgThreads,
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pub storage: Arc<BucketMapHolder<T>>,
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pub in_mem: Vec<Arc<InMemAccountsIndex<T>>>,
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/// set_startup(true) creates bg threads which are kept alive until set_startup(false)
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startup_worker_threads: Mutex<Option<BgThreads>>,
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}
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impl<T: IndexValue> Debug for AccountsIndexStorage<T> {
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fn fmt(&self, _f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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Ok(())
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}
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}
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/// low-level managing the bg threads
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struct BgThreads {
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exit: Arc<AtomicBool>,
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handles: Option<Vec<JoinHandle<()>>>,
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wait: Arc<WaitableCondvar>,
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}
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impl Drop for BgThreads {
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fn drop(&mut self) {
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self.exit.store(true, Ordering::Relaxed);
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self.wait.notify_all();
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if let Some(handles) = self.handles.take() {
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handles
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.into_iter()
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.for_each(|handle| handle.join().unwrap());
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}
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}
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}
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impl BgThreads {
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fn new<T: IndexValue>(
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storage: &Arc<BucketMapHolder<T>>,
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in_mem: &[Arc<InMemAccountsIndex<T>>],
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threads: usize,
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) -> Self {
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// stop signal used for THIS batch of bg threads
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let exit = Arc::new(AtomicBool::default());
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let handles = Some(
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(0..threads)
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.into_iter()
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.map(|_| {
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let storage_ = Arc::clone(storage);
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let exit_ = Arc::clone(&exit);
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let in_mem_ = in_mem.to_vec();
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// note that using rayon here causes us to exhaust # rayon threads and many tests running in parallel deadlock
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Builder::new()
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.name("solana-idx-flusher".to_string())
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.spawn(move || {
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storage_.background(exit_, in_mem_);
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})
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.unwrap()
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})
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.collect(),
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);
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BgThreads {
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exit,
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handles,
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wait: Arc::clone(&storage.wait_dirty_or_aged),
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}
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}
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}
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impl<T: IndexValue> AccountsIndexStorage<T> {
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/// startup=true causes:
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/// in mem to act in a way that flushes to disk asap
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/// also creates some additional bg threads to facilitate flushing to disk asap
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/// startup=false is 'normal' operation
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pub fn set_startup(&self, value: bool) {
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if value {
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// create some additional bg threads to help get things to the disk index asap
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*self.startup_worker_threads.lock().unwrap() = Some(BgThreads::new(
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&self.storage,
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&self.in_mem,
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Self::num_threads(),
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));
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}
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self.storage.set_startup(value);
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if !value {
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// shutdown the bg threads
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*self.startup_worker_threads.lock().unwrap() = None;
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}
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}
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fn num_threads() -> usize {
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std::cmp::max(2, num_cpus::get() / 4)
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}
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/// allocate BucketMapHolder and InMemAccountsIndex[]
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pub fn new(bins: usize, config: &Option<AccountsIndexConfig>) -> Self {
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let threads = config
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.as_ref()
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.and_then(|config| config.flush_threads)
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.unwrap_or_else(Self::num_threads);
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let storage = Arc::new(BucketMapHolder::new(bins, config));
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let in_mem = (0..bins)
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.into_iter()
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.map(|bin| Arc::new(InMemAccountsIndex::new(&storage, bin)))
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.collect::<Vec<_>>();
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Self {
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_bg_threads: BgThreads::new(&storage, &in_mem, threads),
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storage,
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in_mem,
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startup_worker_threads: Mutex::default(),
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}
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}
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}
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