diff --git a/.git-hooks/pre-commit b/.git-hooks/pre-commit
new file mode 100755
index 0000000..ea9c038
--- /dev/null
+++ b/.git-hooks/pre-commit
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Run cargo fmt and check if there are any changes
+cargo fmt --all -- --check
+if [ $? -ne 0 ]; then
+    echo "❌ Formatting check failed. Please run 'cargo fmt' to format your code."
+    exit 1
+fi
+
+echo "✅ Formatting check passed."
+exit 0
diff --git a/Cargo.toml b/Cargo.toml
index cb1ad74..7d52bd1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ shumai = "0.2.15"
 serde = "1.0.210"
 serde_json = "1.0.128"
 flurry = "0.5.1"
+dashmap = "6.1.0"
 mimalloc = { version = "0.1.43", default-features = false }
 selfsimilar = "0.1.0"
 shuttle = "0.8.0"
diff --git a/bench/basic.rs b/bench/basic.rs
index e764702..846a643 100644
--- a/bench/basic.rs
+++ b/bench/basic.rs
@@ -2,7 +2,7 @@ use congee::Art;
 use rand::{thread_rng, Rng};
 use serde::{Deserialize, Serialize};
 use shumai::{config, ShumaiBench};
-use std::{cell::UnsafeCell, fmt::Display};
+use std::{cell::UnsafeCell, collections::BTreeMap, fmt::Display};
 
 use mimalloc::MiMalloc;
 
@@ -26,6 +26,8 @@ impl Display for Workload {
 #[derive(Serialize, Clone, Copy, Debug, Deserialize)]
 pub enum IndexType {
     SingleHashMap,
+    BTree,
+    Dash,
     Flurry,
     ART,
 }
@@ -75,6 +77,76 @@ trait DBIndex: Send + Sync {
     ) -> usize;
 }
 
+struct BTreeMapWrapper {
+    map: UnsafeCell<BTreeMap<usize, usize>>, // only allow single thread access
+}
+
+impl BTreeMapWrapper {
+    fn new() -> Self {
+        Self {
+            map: UnsafeCell::new(BTreeMap::new()),
+        }
+    }
+}
+
+unsafe impl Send for BTreeMapWrapper {}
+unsafe impl Sync for BTreeMapWrapper {}
+
+impl DBIndex for BTreeMapWrapper {
+    type Guard<'a> = ();
+
+    fn pin(&self) -> Self::Guard<'_> {
+        ()
+    }
+
+    fn insert<'a>(&'a self, key: usize, v: usize, _: &Self::Guard<'a>) {
+        unsafe {
+            (*self.map.get()).insert(key, v);
+        }
+    }
+
+    fn get<'a>(&'a self, key: &usize, _: &Self::Guard<'a>) -> Option<usize> {
+        unsafe { (*self.map.get()).get(key).cloned() }
+    }
+
+    fn update<'a>(
+        &'a self,
+        key: &usize,
+        new: usize,
+        _: &Self::Guard<'a>,
+    ) -> Option<(usize, Option<usize>)> {
+        unsafe {
+            (*self.map.get())
+                .entry(*key)
+                .and_modify(|v| *v = new)
+                .or_insert(new);
+        }
+        Some((*key, Some(*key)))
+    }
+
+    fn scan<'a>(
+        &'a self,
+        low_key: &usize,
+        high_key: &usize,
+        results: &mut [(usize, usize)],
+        _: &Self::Guard<'a>,
+    ) -> usize {
+        unsafe {
+            let map = &*self.map.get();
+            let range = map.range(low_key..=high_key);
+            let mut count = 0;
+            for (k, v) in range {
+                if count >= results.len() {
+                    break;
+                }
+                results[count] = (*k, *v);
+                count += 1;
+            }
+            count
+        }
+    }
+}
+
 impl DBIndex for Art<usize, usize> {
     type Guard<'a> = crossbeam_epoch::Guard;
 
@@ -211,6 +283,42 @@ impl DBIndex for flurry::HashMap<usize, usize> {
     }
 }
 
+impl DBIndex for dashmap::DashMap<usize, usize> {
+    type Guard<'a> = ();
+
+    fn pin(&self) -> Self::Guard<'_> {
+        ()
+    }
+
+    fn insert<'a>(&'a self, key: usize, v: usize, _: &Self::Guard<'a>) {
+        self.insert(key, v);
+    }
+
+    fn get<'a>(&'a self, key: &usize, _: &Self::Guard<'a>) -> Option<usize> {
+        self.get(key).map(|v| *v)
+    }
+
+    fn update<'a>(
+        &'a self,
+        key: &usize,
+        new: usize,
+        _: &Self::Guard<'a>,
+    ) -> Option<(usize, Option<usize>)> {
+        self.alter(key, |_, _| new);
+        Some((*key, Some(*key)))
+    }
+
+    fn scan<'a>(
+        &'a self,
+        low_key: &usize,
+        high_key: &usize,
+        results: &mut [(usize, usize)],
+        _: &Self::Guard<'a>,
+    ) -> usize {
+        unimplemented!("DashMap can't scan")
+    }
+}
+
 impl<Index: DBIndex> ShumaiBench for TestBench<Index> {
     type Config = Basic;
     type Result = usize;
@@ -280,6 +388,22 @@ fn main() {
 
     for c in config.iter() {
         match c.index_type {
+            IndexType::BTree => {
+                let mut test_bench = TestBench {
+                    index: BTreeMapWrapper::new(),
+                    initial_cnt: 50_000_000,
+                };
+                let result = shumai::run(&mut test_bench, c, repeat);
+                result.write_json().unwrap();
+            }
+            IndexType::Dash => {
+                let mut test_bench = TestBench {
+                    index: dashmap::DashMap::new(),
+                    initial_cnt: 50_000_000,
+                };
+                let result = shumai::run(&mut test_bench, c, repeat);
+                result.write_json().unwrap();
+            }
             IndexType::Flurry => {
                 let mut test_bench = TestBench {
                     index: flurry::HashMap::new(),
diff --git a/bench/benchmark.toml b/bench/benchmark.toml
index 4e529ee..37fdd73 100644
--- a/bench/benchmark.toml
+++ b/bench/benchmark.toml
@@ -3,15 +3,28 @@ name = "basic"
 threads = [1, 2, 4, 8, 32]
 time = 3
 workload = ["ReadOnly", "InsertOnly", "UpdateOnly", "ScanOnly"]
-index_type = ["Flurry", "ART"]
+index_type = ["Flurry", "ART", "Dash", "BTree"]
 
 [[Basic]]
 name = "single-thread"
 threads = [1]
 time = 3
 workload = ["ReadOnly"]
-index_type = ["ART", "SingleHashMap"]
+index_type = ["ART", "SingleHashMap", "BTree", "Dash"]
 
+[[Basic]] 
+name = "dash"
+threads = [1, 2, 4, 8, 32]
+time = 3
+workload = ["ReadOnly", "InsertOnly", "UpdateOnly"]
+index_type = ["Dash"]
+
+[[Basic]]
+name = "btree"
+threads = [1]
+time = 3
+workload = ["ReadOnly", "InsertOnly", "UpdateOnly"]
+index_type = ["BTree"]
 
 [[Scan]]
 name = "scan"