diff --git a/src/cli/src/main.rs b/src/cli/src/main.rs
index 5c79122..d55af8c 100644
--- a/src/cli/src/main.rs
+++ b/src/cli/src/main.rs
@@ -1,6 +1,6 @@
 extern crate klotski_ffi;
 
-use klotski_ffi::AllCases;
+// use klotski_ffi::AllCases;
 
 // use std::thread::sleep;
 // use std::time::Duration;
@@ -50,18 +50,20 @@ fn main() {
     //     println!("{:09X}", code);
     // }
 
-    for raw_code in &AllCases::raw_codes()[..8] {
-        println!("{}", raw_code);
-    }
-    for short_code in &AllCases::short_codes()[..8] {
-        println!("{}", short_code);
-    }
-    for common_code in &AllCases::common_codes()[..8] {
-        println!("{}", common_code);
-    }
+    // for raw_code in &AllCases::raw_codes()[..8] {
+    //     println!("{}", raw_code);
+    // }
+    // for short_code in &AllCases::short_codes()[..8] {
+    //     println!("{}", short_code);
+    // }
+    // for common_code in &AllCases::common_codes()[..8] {
+    //     println!("{}", common_code);
+    // }
 
     // loop {
     //     sleep(Duration::from_secs(1));
     // }
 
+    klotski_ffi::demo();
+
 }
diff --git a/src/klotski_core/ffi/benchmark.cc b/src/klotski_core/ffi/benchmark.cc
index d251fb2..cdcfa41 100644
--- a/src/klotski_core/ffi/benchmark.cc
+++ b/src/klotski_core/ffi/benchmark.cc
@@ -9,7 +9,7 @@ void benchmark_preparation() {
     Benchmark::data_preparation();
 }
 
-double benchmark_warm_up(uint64_t count) {
+double benchmark_warm_up_us(uint64_t count) {
     return Benchmark::warm_up(count);
 }
 
diff --git a/src/klotski_core/klotski.h b/src/klotski_core/klotski.h
index efada34..21941f2 100644
--- a/src/klotski_core/klotski.h
+++ b/src/klotski_core/klotski.h
@@ -119,7 +119,7 @@ extern "C" {
 extern "C" {
 #endif
     EXTERN_FUNC void benchmark_preparation();
-    EXTERN_FUNC double benchmark_warm_up(uint64_t count);
+    EXTERN_FUNC double benchmark_warm_up_us(uint64_t count);
 
     EXTERN_FUNC double benchmark_range_flip_ns();
 
diff --git a/src/rust_ffi/src/benchmark/chore.rs b/src/rust_ffi/src/benchmark/chore.rs
new file mode 100644
index 0000000..3034eb5
--- /dev/null
+++ b/src/rust_ffi/src/benchmark/chore.rs
@@ -0,0 +1,58 @@
+#[derive(Debug)]
+pub(crate) struct Duration {
+    picos: u64
+}
+
+impl Duration {
+    #[allow(dead_code)]
+    pub(crate) fn from_ns(ns: f64) -> Duration {
+        Duration {
+            picos: (ns * (1_000 as f64)) as u64
+        }
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn from_us(us: f64) -> Duration {
+        Duration {
+            picos: (us * (1_000_000 as f64)) as u64
+        }
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn from_ms(ms: f64) -> Duration {
+        Duration {
+            picos: (ms * (1_000_000_000 as f64)) as u64
+        }
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn from_s(s: f64) -> Duration {
+        Duration {
+            picos: (s * (1_000_000_000_000 as i64 as f64)) as u64
+        }
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn to_ns(&self) -> String {
+        let tmp = self.picos as f64 / (1_000 as f64);
+        format!("{:.03}ns", tmp)
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn to_us(&self) -> String {
+        let tmp = self.picos as f64 / (1_000_000 as f64);
+        format!("{:.03}us", tmp)
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn to_ms(&self) -> String {
+        let tmp = self.picos as f64 / (1_000_000_000 as f64);
+        format!("{:.03}ms", tmp)
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn to_s(&self) -> String {
+        let tmp = self.picos as f64 / (1_000_000_000_000 as i64 as f64);
+        format!("{:.03}s", tmp)
+    }
+}
diff --git a/src/rust_ffi/src/benchmark/ffi.rs b/src/rust_ffi/src/benchmark/ffi.rs
new file mode 100644
index 0000000..4e09ef8
--- /dev/null
+++ b/src/rust_ffi/src/benchmark/ffi.rs
@@ -0,0 +1,41 @@
+use super::Duration;
+use crate::core::Core;
+use std::cmp::Ordering;
+
+pub(crate) fn preparation() {
+    unsafe {
+        Core::benchmark_preparation();
+    }
+}
+
+pub(crate) fn warm_up(count: u64) -> Duration {
+    unsafe {
+        Duration::from_us(Core::benchmark_warm_up_us(count))
+    }
+}
+
+pub(crate) fn range_flip() -> Duration {
+    unsafe {
+        Duration::from_ns(Core::benchmark_range_flip_ns())
+    }
+}
+
+pub(crate) fn basic_ranges() -> Result<Duration, &'static str> {
+    unsafe {
+        let time = Core::benchmark_basic_ranges_ms();
+        match time.total_cmp(&(0 as f64)) {
+            Ordering::Greater => Ok(Duration::from_ms(time)),
+            _ => Err("data already built"),
+        }
+    }
+}
+
+pub(crate) fn all_cases() -> Result<Duration, &'static str> {
+    unsafe {
+        let time = Core::benchmark_all_cases_ms();
+        match time.total_cmp(&(0 as f64)) {
+            Ordering::Greater => Ok(Duration::from_ms(time)),
+            _ => Err("data already built"),
+        }
+    }
+}
diff --git a/src/rust_ffi/src/benchmark/mod.rs b/src/rust_ffi/src/benchmark/mod.rs
new file mode 100644
index 0000000..f90e1b1
--- /dev/null
+++ b/src/rust_ffi/src/benchmark/mod.rs
@@ -0,0 +1,18 @@
+mod ffi;
+
+mod chore;
+
+use chore::Duration;
+
+use ffi::*;
+
+pub fn demo() {
+
+    println!("warm up: {}", warm_up(0x100_0000).to_ms());
+
+    println!("range flip: {}", range_flip().to_ns());
+
+    println!("basic ranges: {}", basic_ranges().unwrap().to_ms());
+    println!("all cases: {}", all_cases().unwrap().to_ms());
+
+}
diff --git a/src/rust_ffi/src/lib.rs b/src/rust_ffi/src/lib.rs
index f809766..d20f385 100644
--- a/src/rust_ffi/src/lib.rs
+++ b/src/rust_ffi/src/lib.rs
@@ -5,6 +5,7 @@ mod core;
 mod codec;
 mod metadata;
 mod all_cases;
+mod benchmark;
 
 pub use codec::RawCode;
 pub use codec::ShortCode;
@@ -13,3 +14,5 @@ pub use codec::CommonCode;
 pub use all_cases::AllCases;
 
 pub use metadata::load_metadata as metadata;
+
+pub use benchmark::demo;