feat(runtime): Set server process to run with highest system priority (#5206)

Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: Robert Brennan <accounts@rbren.io>

openhands/runtime/impl/modal/modal_runtime.py

@@ -252,6 +252,7 @@ echo 'export INPUTRC=/etc/inputrc' >> /etc/bash.bashrc
                 self.config.sandbox.user_id,
                 plugin_args,
                 browsergym_args,
+                is_root=not self.config.run_as_openhands,  # is_root=True when running as root
             )
             self.log('debug', f'Starting container with command: {sandbox_start_cmd}')
             self.sandbox = modal.Sandbox.create(

openhands/runtime/impl/remote/remote_runtime.py

@@ -235,6 +235,7 @@ class RemoteRuntime(Runtime):
             self.config.sandbox.user_id,
             plugin_args,
             browsergym_args,
+            is_root=not self.config.run_as_openhands,  # is_root=True when running as root
         )
         start_request = {
             'image': self.container_image,

openhands/runtime/impl/runloop/runloop_runtime.py

@@ -171,6 +171,7 @@ class RunloopRuntime(EventStreamRuntime):
             self.config.sandbox.user_id,
             plugin_args,
             browsergym_args,
+            is_root=not self.config.run_as_openhands,  # is_root=True when running as root
         )
 
         # Add some additional commands based on our image

openhands/runtime/utils/command.py

@@ -5,8 +5,9 @@ def get_remote_startup_command(
     user_id: int,
     plugin_args: list[str],
     browsergym_args: list[str],
+    is_root: bool = False,
 ):
-    return [
+    base_cmd = [
         '/openhands/micromamba/bin/micromamba',
         'run',
         '-n',
@@ -27,3 +28,18 @@ def get_remote_startup_command(
         str(user_id),
         *browsergym_args,
     ]
+
+    if is_root:
+        # If running as root, set highest priority and lowest OOM score
+        cmd_str = ' '.join(base_cmd)
+        return [
+            'nice',
+            '-n',
+            '-20',  # Highest priority
+            'sh',
+            '-c',
+            f'echo -1000 > /proc/self/oom_score_adj && exec {cmd_str}'
+        ]
+    else:
+        # If not root, run with normal priority
+        return base_cmd