diff --git a/__wasm/wasmtime/src/main.rs b/__wasm/wasmtime/src/main.rs
index 951a76c..e45c1d8 100644
--- a/__wasm/wasmtime/src/main.rs
+++ b/__wasm/wasmtime/src/main.rs
@@ -1,3 +1,7 @@
+use std::io::{stdout, Write};
+use std::thread;
+use std::time::Duration;
+
 use anyhow::Result;
 use wasmtime::*;
 
@@ -17,19 +21,42 @@ fn main() -> Result<()> {
     let linker = Linker::new(&engine);
     let mut store = Store::new(&engine, 4);
     store.set_epoch_deadline(10);
+    store.epoch_deadline_trap();
+    // store.epoch_deadline_callback(|a /*store -> data*/| {
+    //     println!("!epoch_deadline_callback! -- {}", a);
+    //     //Ok(1)
+    //     Err(anyhow::anyhow!("error"))
+    // });
+
+    thread::spawn(move || {
+        for _ in 0.. {
+            thread::sleep(Duration::from_millis(100));
+            print!(":");
+            stdout().flush().ok();
+            engine.increment_epoch();
+        }
+    });
 
     let instance = linker.instantiate(&mut store, &module)?;
 
     let hello = instance.get_typed_func::<(i32, i32), i32>(&mut store, "add")?;
     // let hello2 = instance.get_typed_func::<(&str, i32), i32, _>(&mut store, "add")?;
 
-    store.add_fuel(10_000_u64).ok();
+    store.add_fuel(1000_000_000_u64).ok();
 
     println!("1 + 2 = {:?}", hello.call(&mut store, (1, 2))?);
     println!("Fuel consumed: {:?}", store.fuel_consumed());
     println!("2 + 3 = {:?}", hello.call(&mut store, (2, 3))?);
     println!("Fuel consumed: {:?}", store.fuel_consumed());
 
+    for i in 0..100000000 {
+        if i % 10000 == 0 {
+            print!(".");
+            stdout().flush().ok();
+        }
+        hello.call(&mut store, (1, 2))?;
+    }
+
     Ok(())
 }