add hash calc scan_chunks metric (#30333)

runtime/src/accounts_db.rs

@@ -7076,7 +7076,7 @@ impl AccountsDb {
         snapshot_storages: &SortedStorages,
         scanner: S,
         bin_range: &Range<usize>,
-        stats: &HashStats,
+        stats: &mut HashStats,
     ) -> Vec<CacheHashDataFile>
     where
         S: AppendVecScan,
@@ -7089,6 +7089,7 @@ impl AccountsDb {
             snapshot_storages,
         );
 
+        stats.scan_chunks = splitter.chunk_count;
         (0..splitter.chunk_count)
             .into_par_iter()
             .map(|chunk| {
@@ -10378,7 +10379,7 @@ pub mod tests {
             &get_storage_refs(&[storage]),
             test_scan,
             &Range { start: 0, end: 1 },
-            &HashStats::default(),
+            &mut HashStats::default(),
         );
         assert_eq!(calls.load(Ordering::Relaxed), 1);
         assert_scan(

runtime/src/accounts_hash.rs

@@ -127,6 +127,7 @@ pub struct HashStats {
     pub hash_total: usize,
     pub unreduced_entries: usize,
     pub num_snapshot_storage: usize,
+    pub scan_chunks: usize,
     pub num_slots: usize,
     pub num_dirty_slots: usize,
     pub collect_snapshots_us: u64,
@@ -206,6 +207,7 @@ impl HashStats {
                 self.num_snapshot_storage as i64,
                 i64
             ),
+            ("scan_chunks", self.scan_chunks as i64, i64),
             ("num_slots", self.num_slots as i64, i64),
             ("num_dirty_slots", self.num_dirty_slots as i64, i64),
             ("min_bin_size", self.min_bin_size as i64, i64),