diff --git a/slime/utils/http_utils.py b/slime/utils/http_utils.py
index f5f119abae..7ce395c4db 100644
--- a/slime/utils/http_utils.py
+++ b/slime/utils/http_utils.py
@@ -221,8 +221,8 @@ def init_http_client(args):
 def _init_ray_distributed_post(args):
     """Initialize one or more Ray async actors per node for HTTP POST.
 
-    Uses NodeAffinitySchedulingStrategy to place actors on distinct nodes.
-    Controlled by SLIME_HTTP_POST_ACTORS_PER_NODE.
+    Uses NodeAffinitySchedulingStrategy to place actors on alive Ray nodes.
+    Creates ``args.num_gpus_per_node`` actors per node.
     """
     global _post_actors
     if _post_actors:
@@ -252,8 +252,8 @@ async def do_post(self, url, payload, max_retries=60, headers=None):
 
     # Create actors per node
     created = []
-    # Distribute client concurrency across actors (at least 1 per actor)
-    per_actor_conc = (_client_concurrency + len(nodes)) // len(nodes)
+    total_actors = max(1, len(nodes) * args.num_gpus_per_node)
+    per_actor_conc = max(1, (_client_concurrency + total_actors - 1) // total_actors)
 
     for node in nodes:
         node_id = node["NodeID"]