Adds --accounts-db-hash-threads to validator and ledger-tool

accounts-db/src/accounts_db.rs

@@ -101,7 +101,7 @@ use {
         fs,
         hash::{Hash as StdHash, Hasher as StdHasher},
         io::Result as IoResult,
-        num::Saturating,
+        num::{NonZeroUsize, Saturating},
         ops::{Range, RangeBounds},
         path::{Path, PathBuf},
         sync::{
@@ -510,6 +510,7 @@ pub const ACCOUNTS_DB_CONFIG_FOR_TESTING: AccountsDbConfig = AccountsDbConfig {
     storage_access: StorageAccess::Mmap,
     scan_filter_for_shrinking: ScanFilter::OnlyAbnormalWithVerify,
     enable_experimental_accumulator_hash: false,
+    num_hash_threads: None,
 };
 pub const ACCOUNTS_DB_CONFIG_FOR_BENCHMARKS: AccountsDbConfig = AccountsDbConfig {
     index: Some(ACCOUNTS_INDEX_CONFIG_FOR_BENCHMARKS),
@@ -527,6 +528,7 @@ pub const ACCOUNTS_DB_CONFIG_FOR_BENCHMARKS: AccountsDbConfig = AccountsDbConfig
     storage_access: StorageAccess::Mmap,
     scan_filter_for_shrinking: ScanFilter::OnlyAbnormalWithVerify,
     enable_experimental_accumulator_hash: false,
+    num_hash_threads: None,
 };
 
 pub type BinnedHashData = Vec<Vec<CalculateHashIntermediate>>;
@@ -638,6 +640,8 @@ pub struct AccountsDbConfig {
     pub storage_access: StorageAccess,
     pub scan_filter_for_shrinking: ScanFilter,
     pub enable_experimental_accumulator_hash: bool,
+    /// Number of threads for background accounts hashing (`thread_pool_hash`)
+    pub num_hash_threads: Option<NonZeroUsize>,
 }
 
 #[cfg(not(test))]
@@ -1746,9 +1750,15 @@ pub fn make_min_priority_thread_pool() -> ThreadPool {
         .unwrap()
 }
 
-pub fn make_hash_thread_pool() -> ThreadPool {
+/// Returns the default number of threads to use for background accounts hashing
+pub fn default_num_hash_threads() -> NonZeroUsize {
     // 1/8 of the number of cpus and up to 6 threads gives good balance for the system.
     let num_threads = (num_cpus::get() / 8).clamp(2, 6);
+    NonZeroUsize::new(num_threads).unwrap()
+}
+
+pub fn make_hash_thread_pool(num_threads: Option<NonZeroUsize>) -> ThreadPool {
+    let num_threads = num_threads.unwrap_or_else(default_num_hash_threads).get();
     rayon::ThreadPoolBuilder::new()
         .thread_name(|i| format!("solAcctHash{i:02}"))
         .num_threads(num_threads)
@@ -1893,7 +1903,7 @@ impl AccountsDb {
             .build()
             .expect("new rayon threadpool");
         let thread_pool_clean = make_min_priority_thread_pool();
-        let thread_pool_hash = make_hash_thread_pool();
+        let thread_pool_hash = make_hash_thread_pool(accounts_db_config.num_hash_threads);
 
         let mut new = Self {
             accounts_index,

ledger-tool/src/args.rs

@@ -11,7 +11,7 @@ use {
     solana_clap_utils::{
         hidden_unless_forced,
         input_parsers::pubkeys_of,
-        input_validators::{is_parsable, is_pow2},
+        input_validators::{is_parsable, is_pow2, is_within_range},
     },
     solana_ledger::{
         blockstore_processor::ProcessOptions,
@@ -21,6 +21,7 @@ use {
     solana_sdk::clock::Slot,
     std::{
         collections::HashSet,
+        num::NonZeroUsize,
         path::{Path, PathBuf},
         sync::Arc,
     },
@@ -131,6 +132,13 @@ pub fn accounts_db_args<'a, 'b>() -> Box<[Arg<'a, 'b>]> {
             .long("accounts-db-experimental-accumulator-hash")
             .help("Enables the experimental accumulator hash")
             .hidden(hidden_unless_forced()),
+        Arg::with_name("accounts_db_hash_threads")
+            .long("accounts-db-hash-threads")
+            .value_name("NUM_THREADS")
+            .takes_value(true)
+            .validator(|s| is_within_range(s, 1..=num_cpus::get()))
+            .help("Number of threads to use for background accounts hashing")
+            .hidden(hidden_unless_forced()),
     ]
     .into_boxed_slice()
 }
@@ -331,6 +339,10 @@ pub fn get_accounts_db_config(
         })
         .unwrap_or_default();
 
+    let num_hash_threads = arg_matches
+        .is_present("accounts_db_hash_threads")
+        .then(|| value_t_or_exit!(arg_matches, "accounts_db_hash_threads", NonZeroUsize));
+
     AccountsDbConfig {
         index: Some(accounts_index_config),
         base_working_path: Some(ledger_tool_ledger_path),
@@ -347,6 +359,7 @@ pub fn get_accounts_db_config(
         scan_filter_for_shrinking,
         enable_experimental_accumulator_hash: arg_matches
             .is_present("accounts_db_experimental_accumulator_hash"),
+        num_hash_threads,
         ..AccountsDbConfig::default()
     }
 }

validator/src/cli/thread_args.rs

@@ -2,13 +2,15 @@
 
 use {
     clap::{value_t_or_exit, Arg, ArgMatches},
+    solana_accounts_db::accounts_db,
     solana_clap_utils::{hidden_unless_forced, input_validators::is_within_range},
     solana_rayon_threadlimit::{get_max_thread_count, get_thread_count},
     std::{num::NonZeroUsize, ops::RangeInclusive},
 };
 
 // Need this struct to provide &str whose lifetime matches that of the CLAP Arg's
 pub struct DefaultThreadArgs {
+    pub accounts_db_hash_threads: String,
     pub ip_echo_server_threads: String,
     pub replay_forks_threads: String,
     pub replay_transactions_threads: String,
@@ -19,6 +21,7 @@ pub struct DefaultThreadArgs {
 impl Default for DefaultThreadArgs {
     fn default() -> Self {
         Self {
+            accounts_db_hash_threads: AccountsDbHashThreadsArg::bounded_default().to_string(),
             ip_echo_server_threads: IpEchoServerThreadsArg::bounded_default().to_string(),
             replay_forks_threads: ReplayForksThreadsArg::bounded_default().to_string(),
             replay_transactions_threads: ReplayTransactionsThreadsArg::bounded_default()
@@ -31,6 +34,7 @@ impl Default for DefaultThreadArgs {
 
 pub fn thread_args<'a>(defaults: &DefaultThreadArgs) -> Vec<Arg<'_, 'a>> {
     vec![
+        new_thread_arg::<AccountsDbHashThreadsArg>(&defaults.accounts_db_hash_threads),
         new_thread_arg::<IpEchoServerThreadsArg>(&defaults.ip_echo_server_threads),
         new_thread_arg::<ReplayForksThreadsArg>(&defaults.replay_forks_threads),
         new_thread_arg::<ReplayTransactionsThreadsArg>(&defaults.replay_transactions_threads),
@@ -51,6 +55,7 @@ fn new_thread_arg<'a, T: ThreadArg>(default: &str) -> Arg<'_, 'a> {
 }
 
 pub struct NumThreadConfig {
+    pub accounts_db_hash_threads: NonZeroUsize,
     pub ip_echo_server_threads: NonZeroUsize,
     pub replay_forks_threads: NonZeroUsize,
     pub replay_transactions_threads: NonZeroUsize,
@@ -60,6 +65,11 @@ pub struct NumThreadConfig {
 
 pub fn parse_num_threads_args(matches: &ArgMatches) -> NumThreadConfig {
     NumThreadConfig {
+        accounts_db_hash_threads: value_t_or_exit!(
+            matches,
+            AccountsDbHashThreadsArg::NAME,
+            NonZeroUsize
+        ),
         ip_echo_server_threads: value_t_or_exit!(
             matches,
             IpEchoServerThreadsArg::NAME,
@@ -116,6 +126,17 @@ trait ThreadArg {
     }
 }
 
+struct AccountsDbHashThreadsArg;
+impl ThreadArg for AccountsDbHashThreadsArg {
+    const NAME: &'static str = "accounts_db_hash_threads";
+    const LONG_NAME: &'static str = "accounts-db-hash-threads";
+    const HELP: &'static str = "Number of threads to use for background accounts hashing";
+
+    fn default() -> usize {
+        accounts_db::default_num_hash_threads().get()
+    }
+}
+
 struct IpEchoServerThreadsArg;
 impl ThreadArg for IpEchoServerThreadsArg {
     const NAME: &'static str = "ip_echo_server_threads";

validator/src/main.rs

@@ -909,6 +909,15 @@ pub fn main() {
         _ => unreachable!(),
     };
 
+    let cli::thread_args::NumThreadConfig {
+        accounts_db_hash_threads,
+        ip_echo_server_threads,
+        replay_forks_threads,
+        replay_transactions_threads,
+        tvu_receive_threads,
+        tvu_sigverify_threads,
+    } = cli::thread_args::parse_num_threads_args(&matches);
+
     let identity_keypair = keypair_of(&matches, "identity").unwrap_or_else(|| {
         clap::Error::with_description(
             "The --identity <KEYPAIR> argument is required",
@@ -1303,6 +1312,7 @@ pub fn main() {
         scan_filter_for_shrinking,
         enable_experimental_accumulator_hash: matches
             .is_present("accounts_db_experimental_accumulator_hash"),
+        num_hash_threads: Some(accounts_db_hash_threads),
         ..AccountsDbConfig::default()
     };
 
@@ -1387,14 +1397,6 @@ pub fn main() {
 
     let full_api = matches.is_present("full_rpc_api");
 
-    let cli::thread_args::NumThreadConfig {
-        ip_echo_server_threads,
-        replay_forks_threads,
-        replay_transactions_threads,
-        tvu_receive_threads,
-        tvu_sigverify_threads,
-    } = cli::thread_args::parse_num_threads_args(&matches);
-
     let mut validator_config = ValidatorConfig {
         require_tower: matches.is_present("require_tower"),
         tower_storage,