Detect zombie processes and ignore them before calling cmdline API

Author: namannandan

src/sagemaker_pytorch_serving_container/torchserve.py

@@ -184,12 +184,12 @@ def _retrieve_ts_server_process():
     ts_server_processes = list()
 
     for process in psutil.process_iter():
-        try:
-            if TS_NAMESPACE in process.cmdline():
-                ts_server_processes.append(process)
-        except psutil.NoSuchProcess:
+        if process.status() == psutil.STATUS_ZOMBIE:
             continue
 
+        if TS_NAMESPACE in process.cmdline():
+            ts_server_processes.append(process)
+
     if not ts_server_processes:
         raise Exception("Torchserve model server was unsuccessfully started")