Enable specification of target hostname for a dragon task

doc/changelog.md

@@ -13,6 +13,7 @@ Jump to:
 
 Description
 
+- Enable hostname selection for dragon tasks
 - Remove pydantic dependency from MLI code
 - Update MLI environment variables using new naming convention
 - Reduce a copy by using torch.from_numpy instead of torch.tensor

smartsim/_core/launcher/dragon/dragonLauncher.py

@@ -170,6 +170,7 @@ def run(self, step: Step) -> t.Optional[str]:
             merged_env = self._connector.merge_persisted_env(os.environ.copy())
             nodes = int(run_args.get("nodes", None) or 1)
             tasks_per_node = int(run_args.get("tasks-per-node", None) or 1)
+            hosts = str(run_args.get("host-list", ""))
 
             policy = DragonRunPolicy.from_run_args(run_args)
 
@@ -187,6 +188,7 @@ def run(self, step: Step) -> t.Optional[str]:
                         output_file=out,
                         error_file=err,
                         policy=policy,
+                        hostlist=hosts,
                     )
                 ),
                 DragonRunResponse,