perf: calculate exe_seq only when info logging is enabled

Signed-off-by: Amin Yahyaabadi <[email protected]>

src/engine/dag.rs

@@ -216,11 +216,16 @@ impl Dag {
     /// topological sorting, and cancel the execution of subsequent tasks if an
     /// error is encountered during task execution.
     pub(crate) async fn run(&self) -> bool {
-        let mut exe_seq = String::from("[Start]");
-        self.exe_sequence
-            .iter()
-            .for_each(|id| exe_seq.push_str(&format!(" -> {}", self.tasks[id].name())));
-        info!("{} -> [End]", exe_seq);
+        info!(
+            "[Start]{} -> [End]",
+            (|| {
+                let mut exe_seq = String::new();
+                self.exe_sequence
+                    .iter()
+                    .for_each(|id| exe_seq.push_str(&format!(" -> {}", self.tasks[id].name())));
+                exe_seq
+            })()
+        );
         let mut handles = Vec::new();
         self.exe_sequence.iter().for_each(|id| {
             handles.push((*id, self.execute_task(&self.tasks[id])));