Adds a bench for hash_account() (#47)

accounts-db/Cargo.toml

@@ -70,6 +70,7 @@ name = "solana_accounts_db"
 
 [dev-dependencies]
 assert_matches = { workspace = true }
+criterion = { workspace = true }
 ed25519-dalek = { workspace = true }
 libsecp256k1 = { workspace = true }
 memoffset = { workspace = true }
@@ -89,3 +90,7 @@ rustc_version = { workspace = true }
 
 [features]
 dev-context-only-utils = []
+
+[[bench]]
+name = "bench_hashing"
+harness = false

accounts-db/benches/bench_hashing.rs

@@ -0,0 +1,43 @@
+use {
+    criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput},
+    solana_accounts_db::accounts_db::AccountsDb,
+    solana_sdk::{account::AccountSharedData, pubkey::Pubkey},
+};
+
+const KB: usize = 1024;
+const MB: usize = KB * KB;
+
+const DATA_SIZES: [usize; 6] = [
+    0,       // the smallest account
+    165,     // the size of an spl token account
+    200,     // the size of a stake account
+    KB,      // a medium sized account
+    MB,      // a large sized account
+    10 * MB, // the largest account
+];
+
+/// The number of bytes of *non account data* that are also hashed as
+/// part of computing an account's hash.
+///
+/// Ensure this constant stays in sync with the value of `META_SIZE` in
+/// AccountsDb::hash_account_data().
+const META_SIZE: usize = 81;
+
+fn bench_hash_account(c: &mut Criterion) {
+    let lamports = 123_456_789;
+    let owner = Pubkey::default();
+    let address = Pubkey::default();
+
+    let mut group = c.benchmark_group("hash_account");
+    for data_size in DATA_SIZES {
+        let num_bytes = META_SIZE.checked_add(data_size).unwrap();
+        group.throughput(Throughput::Bytes(num_bytes as u64));
+        let account = AccountSharedData::new(lamports, data_size, &owner);
+        group.bench_function(BenchmarkId::new("data_size", data_size), |b| {
+            b.iter(|| AccountsDb::hash_account(&account, &address));
+        });
+    }
+}
+
+criterion_group!(benches, bench_hash_account,);
+criterion_main!(benches);