pd分离_tbo

vllm/attention/layer.py

@@ -414,9 +414,9 @@ def unified_attention(
     output = self.impl.forward(self, query, key, value, kv_cache,
                                attn_metadata)
 
-    if envs.VLLM_ENABLE_TBO:
-        tbo_maybe_save_kv_layer_to_connector(layer_name, kv_cache)
-    else:
+    # if envs.VLLM_ENABLE_TBO:
+    #     tbo_maybe_save_kv_layer_to_connector(layer_name, kv_cache)
+    # else:
     maybe_save_kv_layer_to_connector(layer_name, kv_cache)
     return output
 
@@ -462,9 +462,9 @@ def unified_attention_with_output(
                       attn_metadata,
                       output=output,
                       output_scale=output_scale)
-    if envs.VLLM_ENABLE_TBO:
-        tbo_maybe_save_kv_layer_to_connector(layer_name, kv_cache)
-    else:
+    # if envs.VLLM_ENABLE_TBO:
+    #     tbo_maybe_save_kv_layer_to_connector(layer_name, kv_cache)
+    # else:
     maybe_save_kv_layer_to_connector(layer_name, kv_cache)
 
 

vllm/model_executor/layers/activation.py

@@ -75,6 +75,9 @@ class SiluAndMul(CustomOp):
 
     def forward_native(self, x: torch.Tensor) -> torch.Tensor:
         """PyTorch-native implementation equivalent to forward()."""
+        if not torch.compiler.is_compiling():  # 非 capture 阶段
+            return self.forward_cuda(x)  # 强制走 fused kernel
+        else:
             d = x.shape[-1] // 2
             return F.silu(x[..., :d]) * x[..., d:]
 

vllm/model_executor/layers/layernorm.py

@@ -165,7 +165,11 @@ class RMSNorm(CustomOp):
         x: torch.Tensor,
         residual: Optional[torch.Tensor] = None,
     ) -> Union[torch.Tensor, tuple[torch.Tensor, torch.Tensor]]:
-        """PyTorch-native implementation equivalent to forward()."""
+        
+        if not torch.compiler.is_compiling():  # 非 capture 阶段
+            return self.forward_cuda(x, residual)  # 强制走 fused kernel
+        else:
+            # 否则fallback到原始实现
             orig_dtype = x.dtype
             x = x.to(torch.float32)
             if residual is not None:
@@ -184,11 +188,9 @@ class RMSNorm(CustomOp):
                     raise ValueError(
                         "Expected hidden_size to be at least "
                         f"{self.variance_size_override}, but found: {hidden_size}")
-
                 x_var = x[:, :, :self.variance_size_override]
 
             variance = x_var.pow(2).mean(dim=-1, keepdim=True)
-
             x = x * torch.rsqrt(variance + self.variance_epsilon)
             x = x.to(orig_dtype)
             if self.has_weight:

vllm/two_batch_overlap/v1/two_batch_overlap_v1.py

@@ -17,10 +17,12 @@ logger = init_logger(__name__)
 tbo_step_stream = None
 all_reduce_stream = None
 
-class TwoBatchOverlap():
+PERSIST_THREADS = os.getenv('VLLM_TBO_PERSIST_THREADS', '1') not in ('0','false','False','no','NO','')
+STOP = object()
+
+class TwoBatchOverlap:
     def __init__(self):
-        global tbo_step_stream
-        global all_reduce_stream
+        global tbo_step_stream, all_reduce_stream
         self.model_input_left_queue = queue.Queue()
         self.model_input_right_queue = queue.Queue()
         self.states_left_queue = queue.Queue()
@@ -29,12 +31,14 @@ class TwoBatchOverlap():
         self.right_thread = None
         self.left_tid = 0
         self.right_tid = 0
+        self._stop_evt = threading.Event()
+        self._threads_started = False
         self.sem_left = threading.Semaphore(0)
         self.sem_right = threading.Semaphore(0)
         self.left_first = False
         self.tbo_running = False
         self.tbo_in_capture = False
-        if tbo_step_stream == None:
+        if tbo_step_stream is None:
             tbo_step_stream = torch.cuda.Stream()
             all_reduce_stream = torch.cuda.Stream()
         self.step_event = torch.cuda.Event(enable_timing=False)
@@ -44,35 +48,52 @@ class TwoBatchOverlap():
         self.event_right_t2c = torch.cuda.Event(enable_timing=False)
 
     def init_tbo_thread(self):
-        self.model_input_left_queue.empty()
-        self.model_input_right_queue.empty()
-        self.left_thread = threading.Thread(target=self.thread_two_batch_overlap, args=(self.model_input_left_queue,))
+        if self._threads_started and PERSIST_THREADS:
+            return
+        if self.left_thread is None or not self.left_thread.is_alive():
+            self.left_thread = threading.Thread(target=self.thread_two_batch_overlap,
+                                                args=(self.model_input_left_queue,), daemon=True)
             self.left_thread.start()
-        self.right_thread = threading.Thread(target=self.thread_two_batch_overlap, args=(self.model_input_right_queue,))
+        if self.right_thread is None or not self.right_thread.is_alive():
+            self.right_thread = threading.Thread(target=self.thread_two_batch_overlap,
+                                                 args=(self.model_input_right_queue,), daemon=True)
             self.right_thread.start()
-        if get_tp_group().rank == 0:
-            logger.info('tbo:two batch overlap start')
+        self._threads_started = True
 
-    def finish_thread(self):
-        self.left_thread.join()
+    def shutdown(self, timeout=5.0):
+        self._stop_evt.set()
+        try:
+            self.model_input_left_queue.put(STOP)
+            self.model_input_right_queue.put(STOP)
+        except Exception:
+            pass
+        if self.left_thread is not None:
+            self.left_thread.join(timeout=timeout)
             self.left_thread = None
-        self.right_thread.join()
+        if self.right_thread is not None:
+            self.right_thread.join(timeout=timeout)
             self.right_thread = None
 
     @torch.inference_mode()
-    def thread_two_batch_overlap(self, queue):
+    def thread_two_batch_overlap(self, q):
         is_left_thread = False
         tid = threading.get_ident()
-        if queue == self.model_input_left_queue:
+        if q is self.model_input_left_queue:
             self.left_tid = tid
             is_left_thread = True
             init_tbo_forward_context(True, self.left_tid)
         else:
             self.right_tid = tid
             init_tbo_forward_context(False, self.right_tid)
+
+        while not self._stop_evt.is_set():
+            item = q.get()
+            if item is STOP:
+                break
+
             with torch.cuda.stream(tbo_step_stream):
-            queue.get()
                 self.tbo_thread_synchronize(tid)
+
                 if is_left_thread:
                     attn_metadata = self.attn_metadata_left
                     num_input_tokens = self.num_input_tokens_left
@@ -84,20 +105,28 @@ class TwoBatchOverlap():
                     input_ids = self.input_ids_right
                     positions = self.positions_right
 
-            model_output = None
-            # Run the decoder.
-            # Use persistent buffers for CUDA graphs.
+                # Select per-thread tensors (left/right) with backward-compatible fallback
+                if is_left_thread:
+                    intermediate_tensors = getattr(self, 'intermediate_tensors_left', None)
+                else:
+                    intermediate_tensors = getattr(self, 'intermediate_tensors_right', None)
+                    if intermediate_tensors is None:
+                        intermediate_tensors = getattr(self, 'intermediate_tensors_left', None)
+
+
                 with set_forward_context(attn_metadata,
                                          self.model_runner.vllm_config,
                                          num_tokens=num_input_tokens,
                                          num_tokens_across_dp=self.num_tokens_across_dp,
-                                    skip_cuda_graphs=True):
+                                         skip_cuda_graphs=True,
+                                         ):
                     model_output = self.model_runner.model(
                         input_ids=input_ids,
                         positions=positions,
-                    intermediate_tensors=self.intermediate_tensors,
+                        intermediate_tensors=intermediate_tensors,
                         inputs_embeds=self.inputs_embeds,
                     )
+
             if is_left_thread:
                 self.sem_right.release()
                 self.states_left_queue.put(model_output)
@@ -128,7 +157,8 @@ class TwoBatchOverlap():
                         positions_right,
                         num_tokens_across_dp,
                         intermediate_tensors,
-                        inputs_embeds):
+                        inputs_embeds,
+                        ):
         self.model_runner = model_runner
         self.attn_metadata_left = attn_metadata_left
         self.attn_metadata_right = attn_metadata_right
@@ -139,9 +169,14 @@ class TwoBatchOverlap():
         self.positions_left = positions_left
         self.positions_right = positions_right
         self.num_tokens_across_dp = num_tokens_across_dp
-        self.intermediate_tensors = intermediate_tensors
         self.inputs_embeds = inputs_embeds
 
+        if isinstance(intermediate_tensors, tuple):
+            self.intermediate_tensors_left, self.intermediate_tensors_right = intermediate_tensors
+        else:
+            self.intermediate_tensors_left = intermediate_tensors
+            self.intermediate_tensors_right = None
+
         self.model_input_left_queue.put(None)
         self.model_input_right_queue.put(None)
 
@@ -150,15 +185,18 @@ class TwoBatchOverlap():
         states_right = self.states_right_queue.get()
         return states_left, states_right
 
+
+
+
 tbo_obj_v1 = None
 
 def is_enable_tbo_v1():
     global tbo_obj_v1
-    return tbo_obj_v1 != None
+    return tbo_obj_v1 is not None
 
 def init_two_batch_overlap():
     global tbo_obj_v1
-    if tbo_obj_v1 == None:
+    if tbo_obj_v1 is None:
         tbo_obj_v1 = TwoBatchOverlap()
     tbo_obj_v1.init_tbo_thread()
 
@@ -171,7 +209,7 @@ def tbo_maybe_save_kv_layer_to_connector(layer_name, kv_cache):
     maybe_save_kv_layer_to_connector(layer_name, kv_cache)
 
 def tbo_all_reduce_v1(obj):
-    if envs.VLLM_ENABLE_TBO and tbo_obj_v1 != None and tbo_obj_v1.tbo_running:
+    if envs.VLLM_ENABLE_TBO and tbo_obj_v1 is not None and tbo_obj_v1.tbo_running:
         tid = threading.get_ident()
         if tid == tbo_obj_v1.left_tid:
             event_c2t, event_t2c = tbo_obj_v1.event_left_c2t, tbo_obj_v1.event_left_t2c
@@ -207,19 +245,19 @@ def tbo_model_executable_v1(
         input_ids,
         positions,
         intermediate_tensors,
-        inputs_embeds
+        inputs_embeds,
     ):
-
     init_two_batch_overlap()
     tbo_obj_v1.tbo_running = True
     tbo_obj_v1.left_first = True
     tbo_obj_v1.step_event.record()
     current_stream = torch.cuda.current_stream()
+    num_total_tokens = num_input_tokens_left + num_input_tokens_right
     with torch.cuda.stream(tbo_step_stream):
         tbo_step_stream.wait_event(tbo_obj_v1.step_event)
         tokens_split = [num_input_tokens_left, num_input_tokens_right]
-        input_ids_left, input_ids_right = torch.split(input_ids, tokens_split, dim=0)
-        positions_left, positions_right = torch.split(positions, tokens_split, dim=0)
+        input_ids_left, input_ids_right = torch.split(input_ids[:num_total_tokens], tokens_split, dim=0)
+        positions_left, positions_right = torch.split(positions[:num_total_tokens], tokens_split, dim=0)
         tbo_obj_v1.set_model_input(model_runner,
                                    attn_metadata_left,
                                    attn_metadata_right,
@@ -231,13 +269,21 @@ def tbo_model_executable_v1(
                                    positions_right,
                                    num_tokens_across_dp,
                                    intermediate_tensors,
-                                inputs_embeds)
+                                   inputs_embeds,
+        )
         model_output_left, model_output_right = tbo_obj_v1.get_model_output()
 
         hidden_or_intermediate_states = merge_model_output(model_output_left, model_output_right)
         tbo_obj_v1.tbo_running = False
         tbo_obj_v1.step_event.record()
-        tbo_obj_v1.finish_thread()
     current_stream.wait_event(tbo_obj_v1.step_event)
 
     return hidden_or_intermediate_states
+
+def finalize_two_batch_overlap():
+    global tbo_obj_v1
+    if tbo_obj_v1 is not None:
+        try:
+            tbo_obj_v1.shutdown()
+        finally:
+            tbo_obj_v1 = None

vllm/v1/worker/gpu_model_runner.py

@@ -1374,8 +1374,7 @@ class GPUModelRunner(LoRAModelRunnerMixin):
         # If attention doesn't support CUDA Graphs for this batch, but we
         # compiled with full CUDA graphs, we have to skip them entirely.
         skip_cuda_graphs = self.full_cuda_graph and not attention_cuda_graphs
-
-        if envs.VLLM_ENABLE_TBO and (not self.use_cuda_graph or skip_cuda_graphs):
+        if envs.VLLM_ENABLE_TBO and scheduler_output.total_num_scheduled_tokens >= envs.VLLM_TBO_MIN_TOKENS: 
             model_output, finished_sending, finished_recving = \
                  tbo_split_and_execute_model(self, attn_metadata, num_input_tokens,
                                              num_tokens_across_dp, input_ids, positions,