[Misc] Improve Worker process title and logging prefix (#22205)

Signed-off-by: 22quinn <33176974+22quinn@users.noreply.github.com>

vllm/utils/__init__.py

@@ -3359,7 +3359,7 @@ def has_triton_kernels() -> bool:
 
 def set_process_title(name: str,
                       suffix: str = "",
-                      append: bool = False) -> None:
+                      prefix: str = envs.VLLM_PROCESS_NAME_PREFIX) -> None:
     """
     Set the current process title to a specific name with an
     optional suffix.
@@ -3367,15 +3367,11 @@ def set_process_title(name: str,
     Args:
         name: The title to assign to the current process.
         suffix: An optional suffix to append to the base name.
-        append: Whether to append to the existing process title.
+        prefix: A prefix to prepend to the front separated by `::`.
     """
     if suffix:
         name = f"{name}_{suffix}"
-    if append:
-        name = f"{setproctitle.getproctitle()}_{name}"
-    else:
-        name = f"{envs.VLLM_PROCESS_NAME_PREFIX}::{name}"
-    setproctitle.setproctitle(name)
+    setproctitle.setproctitle(f"{prefix}::{name}")
 
 
 def _add_prefix(file: TextIO, worker_name: str, pid: int) -> None:

vllm/v1/engine/core.py

@@ -697,7 +697,7 @@ class EngineCoreProc(EngineCore):
             parallel_config: ParallelConfig = kwargs[
                 "vllm_config"].parallel_config
             if parallel_config.data_parallel_size > 1 or dp_rank > 0:
-                set_process_title("DPEngineCore", str(dp_rank))
+                set_process_title("EngineCore", f"DP{dp_rank}")
                 decorate_logs()
                 # Set data parallel rank for this engine process.
                 parallel_config.data_parallel_rank = dp_rank

vllm/v1/engine/utils.py

@@ -116,7 +116,7 @@ class CoreEngineProcManager:
             local_dp_ranks.append(local_index)
             self.processes.append(
                 context.Process(target=target_fn,
-                                name=f"EngineCore_{global_index}",
+                                name=f"EngineCore_DP{global_index}",
                                 kwargs=common_kwargs | {
                                     "dp_rank": global_index,
                                     "local_dp_rank": local_index,

vllm/v1/executor/multiproc_executor.py

@@ -26,6 +26,8 @@ from vllm.distributed import (destroy_distributed_environment,
 from vllm.distributed.device_communicators.shm_broadcast import (Handle,
                                                                  MessageQueue)
 from vllm.distributed.kv_transfer.kv_connector.utils import KVOutputAggregator
+from vllm.distributed.parallel_state import (get_dp_group, get_ep_group,
+                                             get_pp_group, get_tp_group)
 from vllm.executor.multiproc_worker_utils import (
     set_multiprocessing_worker_envs)
 from vllm.logger import init_logger
@@ -397,17 +399,6 @@ class WorkerProc:
         wrapper.init_worker(all_kwargs)
         self.worker = wrapper
 
-        pp_size = vllm_config.parallel_config.pipeline_parallel_size
-        tp_size = vllm_config.parallel_config.tensor_parallel_size
-        pp_str = f"PP{rank // tp_size}" if pp_size > 1 else ""
-        tp_str = f"TP{rank % tp_size}" if tp_size > 1 else ""
-        suffix = f"{pp_str}{'_' if pp_str and tp_str else ''}{tp_str}"
-        process_name = "VllmWorker"
-        if suffix:
-            set_process_title(suffix, append=True)
-            process_name = f"{process_name} {suffix}"
-        decorate_logs(process_name)
-
         # Initialize MessageQueue for receiving SchedulerOutput
         self.rpc_broadcast_mq = MessageQueue.create_from_handle(
             input_shm_handle, self.worker.rank)
@@ -425,8 +416,14 @@ class WorkerProc:
                 name="WorkerAsyncOutputCopy")
             self.async_output_copy_thread.start()
 
-        # Initialize device and loads weights
+        # Initialize device
         self.worker.init_device()
+
+        # Set process title and log prefix
+        self.setup_proc_title_and_log_prefix(
+            enable_ep=vllm_config.parallel_config.enable_expert_parallel)
+
+        # Load model
         self.worker.load_model()
 
     @staticmethod
@@ -663,3 +660,24 @@ class WorkerProc:
 
             if output_rank is None or self.rank == output_rank:
                 self.handle_output(output)
+
+    @staticmethod
+    def setup_proc_title_and_log_prefix(enable_ep: bool) -> None:
+        dp_size = get_dp_group().world_size
+        dp_rank = get_dp_group().rank_in_group
+        pp_size = get_pp_group().world_size
+        pp_rank = get_pp_group().rank_in_group
+        tp_size = get_tp_group().world_size
+        tp_rank = get_tp_group().rank_in_group
+        process_name = "Worker"
+        if dp_size > 1:
+            process_name += f"_DP{dp_rank}"
+        if pp_size > 1:
+            process_name += f"_PP{pp_rank}"
+        if tp_size > 1:
+            process_name += f"_TP{tp_rank}"
+        if enable_ep:
+            ep_rank = get_ep_group().rank_in_group
+            process_name += f"_EP{ep_rank}"
+        set_process_title(name=process_name)
+        decorate_logs(process_name)