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minor constant cleanup (#19721)

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This commit is contained in:
Jeff Washington (jwash)
2021-09-08 18:26:10 -05:00
committed by GitHub
parent b83284c9f6
commit 001ed66b4d
1 changed files with 12 additions and 14 deletions
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26
runtime/src/accounts_db.rs
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@ -88,8 +88,12 @@ pub const DEFAULT_NUM_DIRS: u32 = 4;
// When calculating hashes, it is helpful to break the pubkeys found into bins based on the pubkey value.
// More bins means smaller vectors to sort, copy, etc.
pub const PUBKEY_BINS_FOR_CALCULATING_HASHES: usize = 65536;
// # of passes should be a function of the total # of accounts that are active.
// higher passes = slower total time, lower dynamic memory usage
// lower passes = faster total time, higher dynamic memory usage
// passes=2 cuts dynamic memory usage in approximately half.
pub const NUM_SCAN_PASSES: usize = 2;
pub const BINS_PER_PASS: usize = 32768; // PUBKEY_BINS_FOR_CALCULATING_HASHES / NUM_SCAN_PASSES
pub const BINS_PER_PASS: usize = PUBKEY_BINS_FOR_CALCULATING_HASHES / NUM_SCAN_PASSES;
// Without chunks, we end up with 1 output vec for each outer snapshot storage.
// This results in too many vectors to be efficient.
@ -5235,24 +5239,17 @@ impl AccountsDb {
)>,
) -> Result<(Hash, u64), BankHashVerificationError> {
let mut scan_and_hash = move || {
// # of passes should be a function of the total # of accounts that are active.
// higher passes = slower total time, lower dynamic memory usage
// lower passes = faster total time, higher dynamic memory usage
// passes=2 cuts dynamic memory usage in approximately half.
let num_scan_passes: usize = 2;
let bins_per_pass = PUBKEY_BINS_FOR_CALCULATING_HASHES / num_scan_passes;
assert_eq!(
bins_per_pass * num_scan_passes,
BINS_PER_PASS * NUM_SCAN_PASSES,
PUBKEY_BINS_FOR_CALCULATING_HASHES
); // evenly divisible
let mut previous_pass = PreviousPass::default();
let mut final_result = (Hash::default(), 0);
for pass in 0..num_scan_passes {
for pass in 0..NUM_SCAN_PASSES {
let bounds = Range {
start: pass * bins_per_pass,
end: (pass + 1) * bins_per_pass,
start: pass * BINS_PER_PASS,
end: (pass + 1) * BINS_PER_PASS,
};
let result = Self::scan_snapshot_stores_with_cache(
@ -5267,13 +5264,14 @@ impl AccountsDb {
let (hash, lamports, for_next_pass) = AccountsHash::rest_of_hash_calculation(
result,
&mut stats,
pass == num_scan_passes - 1,
pass == NUM_SCAN_PASSES - 1,
previous_pass,
bins_per_pass,
BINS_PER_PASS,
);
previous_pass = for_next_pass;
final_result = (hash, lamports);
}
Ok(final_result)
};
if let Some(thread_pool) = thread_pool {