[Feat] Benchmark with Criterion Continued

bench/benchmark.rs

@@ -22,7 +22,30 @@ fn insert_many(c: &mut Criterion) {
     });
 }
 
+fn get_many(c: &mut Criterion) {
+    let root = tempdir().unwrap();
+    let path = root.path().join("default");
+    let rt = runtime::Runtime::new().unwrap();
+    let mut store = { rt.block_on(async { DataStore::open("benchmark", path).await.unwrap() }) };
 
+    rt.block_on(async {
+        for e in 1..=3000 {
+            let e = e.to_string();
+            store.put(&e, &e).await.unwrap();
+        }
+    });
+
+    c.bench_function("get_many", |b| {
+        b.iter(|| {
+            rt.block_on(async {
+                for e in 1..=3000 {
+                    let e = e.to_string();
+                    store.get(&e).await.unwrap();
+                }
+            });
+        });
+    });
+}
 
-criterion_group!(benches, insert_many);
+criterion_group!(benches, insert_many, get_many);
 criterion_main!(benches);