fix: avoid inspecting suspended processes

doc/changelog.d/3227.fixed.md

@@ -0,0 +1 @@
+fix: avoid inspecting suspended processes

src/ansys/mapdl/core/cli/list_instances.py

@@ -71,10 +71,20 @@
 
     # Assuming all ansys processes have -grpc flag
     mapdl_instances = []
+
+    def is_valid_process(proc):
+        valid_status = proc.status in [psutil.STATUS_RUNNING, psutil.STATUS_IDLE]
+        valid_ansys_process = ("ansys" in proc.name().lower()) or (
+            "mapdl" in proc.name().lower()
+        )
+        grpc_is_active = "-grpc" in proc.cmdline()
+        return valid_status and valid_ansys_process and grpc_is_active
+
     for proc in psutil.process_iter():
-        if (
-            "ansys" in proc.name().lower() or "mapdl" in proc.name().lower()
-        ) and "-grpc" in proc.cmdline():
+        # Check if the process is running and not suspended
+        if is_valid_process(proc):
+            # Checking the number of children we infer if the process is the main process,
+            # or one of the main process thread.
             if len(proc.children(recursive=True)) < 2:
                 proc.ansys_instance = False
             else:

tests/test_mapdl.py

@@ -1952,7 +1952,7 @@ def test_save_on_exit(mapdl, cleared):
     mapdl2 = launch_mapdl(
         license_server_check=False,
         additional_switches=QUICK_LAUNCH_SWITCHES,
-        port=mapdl.port + 1,
+        port=mapdl.port + 2,
     )
     mapdl2.parameters["my_par"] = "initial_value"
 
@@ -1969,7 +1969,7 @@ def test_save_on_exit(mapdl, cleared):
     mapdl2 = launch_mapdl(
         license_server_check=False,
         additional_switches=QUICK_LAUNCH_SWITCHES,
-        port=mapdl.port + 1,
+        port=mapdl.port + 2,
     )
     mapdl2.resume(db_path)
     if mapdl.version >= 24.2:
@@ -1988,7 +1988,7 @@ def test_save_on_exit(mapdl, cleared):
     mapdl2 = launch_mapdl(
         license_server_check=False,
         additional_switches=QUICK_LAUNCH_SWITCHES,
-        port=mapdl.port + 1,
+        port=mapdl.port + 2,
     )
     mapdl2.resume(db_path)
     assert mapdl2.parameters["my_par"] == "new_initial_value"