diff --git a/Cargo.lock b/Cargo.lock
index cd55b720c65e2b..bf9cb8cfd56845 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4898,6 +4898,7 @@ name = "solana-bucket-map"
 version = "1.15.0"
 dependencies = [
  "fs_extra",
+ "lazy_static",
  "log",
  "memmap2",
  "modular-bitfield",
diff --git a/bucket_map/Cargo.toml b/bucket_map/Cargo.toml
index 40f91d60b8fcf0..7fd2eb901efaf2 100644
--- a/bucket_map/Cargo.toml
+++ b/bucket_map/Cargo.toml
@@ -11,6 +11,7 @@ license = "Apache-2.0"
 edition = "2021"
 
 [dependencies]
+lazy_static = "1.4.0"
 log = { version = "0.4.17" }
 memmap2 = "0.5.3"
 modular-bitfield = "0.11.2"
diff --git a/bucket_map/src/bucket_map.rs b/bucket_map/src/bucket_map.rs
index 02666316f55a4a..ef239270927fe7 100644
--- a/bucket_map/src/bucket_map.rs
+++ b/bucket_map/src/bucket_map.rs
@@ -3,10 +3,20 @@
 use {
     crate::{bucket_api::BucketApi, bucket_stats::BucketMapStats, MaxSearch, RefCount},
     solana_sdk::pubkey::Pubkey,
-    std::{convert::TryInto, fmt::Debug, fs, path::PathBuf, sync::Arc},
+    std::{
+        convert::TryInto,
+        fmt::Debug,
+        fs,
+        path::PathBuf,
+        sync::{atomic::AtomicU64, Arc},
+    },
     tempfile::TempDir,
 };
 
+lazy_static! {
+    pub static ref ACCOUNT_INDEX_MMAPPED_FILES_OPEN: AtomicU64 = AtomicU64::default();
+}
+
 #[derive(Debug, Default, Clone)]
 pub struct BucketMapConfig {
     pub max_buckets: usize,
diff --git a/bucket_map/src/bucket_storage.rs b/bucket_map/src/bucket_storage.rs
index dac4e9b11caf03..c418721f8e14ab 100644
--- a/bucket_map/src/bucket_storage.rs
+++ b/bucket_map/src/bucket_storage.rs
@@ -1,5 +1,5 @@
 use {
-    crate::{bucket_stats::BucketStats, MaxSearch},
+    crate::{bucket_map::ACCOUNT_INDEX_MMAPPED_FILES_OPEN, bucket_stats::BucketStats, MaxSearch},
     memmap2::MmapMut,
     rand::{thread_rng, Rng},
     solana_measure::measure::Measure,
@@ -92,6 +92,7 @@ pub enum BucketStorageError {
 impl Drop for BucketStorage {
     fn drop(&mut self) {
         let _ = remove_file(&self.path);
+        ACCOUNT_INDEX_MMAPPED_FILES_OPEN.fetch_sub(1, Ordering::Relaxed);
     }
 }
 
@@ -107,6 +108,7 @@ impl BucketStorage {
     ) -> Self {
         let cell_size = elem_size * num_elems + std::mem::size_of::<Header>() as u64;
         let (mmap, path) = Self::new_map(&drives, cell_size as usize, capacity_pow2, &stats);
+        ACCOUNT_INDEX_MMAPPED_FILES_OPEN.fetch_add(1, Ordering::Relaxed);
         Self {
             path,
             mmap,
diff --git a/bucket_map/src/lib.rs b/bucket_map/src/lib.rs
index a61cae4e36817a..0a92aa8e49dee4 100644
--- a/bucket_map/src/lib.rs
+++ b/bucket_map/src/lib.rs
@@ -1,4 +1,8 @@
 #![allow(clippy::integer_arithmetic)]
+
+#[macro_use]
+extern crate lazy_static;
+
 mod bucket;
 pub mod bucket_api;
 mod bucket_item;
diff --git a/programs/sbf/Cargo.lock b/programs/sbf/Cargo.lock
index 03446bfa495cf0..58ddf98c51cb8c 100644
--- a/programs/sbf/Cargo.lock
+++ b/programs/sbf/Cargo.lock
@@ -4333,6 +4333,7 @@ dependencies = [
 name = "solana-bucket-map"
 version = "1.15.0"
 dependencies = [
+ "lazy_static",
  "log",
  "memmap2",
  "modular-bitfield",
diff --git a/runtime/src/bucket_map_holder_stats.rs b/runtime/src/bucket_map_holder_stats.rs
index 15cdf826d642fc..87b851249d1b6b 100644
--- a/runtime/src/bucket_map_holder_stats.rs
+++ b/runtime/src/bucket_map_holder_stats.rs
@@ -1,5 +1,6 @@
 use {
     crate::{accounts_index::IndexValue, bucket_map_holder::BucketMapHolder},
+    solana_bucket_map::bucket_map::ACCOUNT_INDEX_MMAPPED_FILES_OPEN,
     solana_sdk::timing::AtomicInterval,
     std::{
         fmt::Debug,
@@ -478,6 +479,11 @@ impl BucketMapHolderStats {
                         .swap(0, Ordering::Relaxed),
                     i64
                 ),
+                (
+                    "account_index_mmap_open",
+                    ACCOUNT_INDEX_MMAPPED_FILES_OPEN.load(Ordering::Relaxed) as i64,
+                    i64
+                ),
             );
         } else {
             datapoint_info!(
@@ -573,6 +579,11 @@ impl BucketMapHolderStats {
                 ("items", self.items.swap(0, Ordering::Relaxed), i64),
                 ("items_us", self.items_us.swap(0, Ordering::Relaxed), i64),
                 ("keys", self.keys.swap(0, Ordering::Relaxed), i64),
+                (
+                    "account_index_mmap_open",
+                    ACCOUNT_INDEX_MMAPPED_FILES_OPEN.load(Ordering::Relaxed) as i64,
+                    i64
+                ),
             );
         }
     }