bugfix for mtp fullgraph (#3845)

### What this PR does / why we need it?
bugfix for mtp fullgraph

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?

- vLLM version: v0.11.0rc3
- vLLM main:
83f478bb19

Signed-off-by: zouyida2052 <zouyida2002@gmail.com>

vllm_ascend/platform.py

@@ -306,6 +306,7 @@ class NPUPlatform(Platform):
                 **********************************************************************************\033[0m
                 """
                 logger.warning(warning_message)
+                update_aclgraph_sizes(vllm_config)
             else:
                 logger.info(
                     "%s cudagraph_mode is not support on NPU. falling back to NONE",
@@ -343,6 +344,7 @@ class NPUPlatform(Platform):
                 **********************************************************************************\033[0m
                 """
                 logger.warning(warning_message)
+                update_aclgraph_sizes(vllm_config)
             else:
                 logger.info(
                     "%s cudagraph_mode is not support on NPU. falling back to NONE",

vllm_ascend/utils.py

@@ -349,6 +349,12 @@ def update_cudagraph_capture_sizes(vllm_config: VllmConfig,
 
 def update_aclgraph_sizes(vllm_config: VllmConfig) -> None:
     """Update ACL graph capture sizes based on hardware limitations"""
+    from vllm.config.compilation import CUDAGraphMode
+    if vllm_config.compilation_config.cudagraph_mode == CUDAGraphMode.FULL_DECODE_ONLY:
+        if vllm_config.speculative_config is not None and \
+            vllm_config.speculative_config.num_speculative_tokens > 1:
+            _update_spec_aclgraph_sizes(vllm_config)
+        return
     # NOTE: Currently, we can only capture 1800 graphs at most,
     # due to the limitation of ACL graph. This number is bounded by
     # the number of streams, which is 2048, we save 248 streams
@@ -459,25 +465,48 @@ def update_aclgraph_sizes(vllm_config: VllmConfig) -> None:
             vllm_config.model_config.architectures[0], num_hidden_layers,
             len(original_sizes))
 
+    if vllm_config.speculative_config is not None and \
+        vllm_config.speculative_config.num_speculative_tokens > 1:
+        _update_spec_aclgraph_sizes(vllm_config)
+
+
+def _update_spec_aclgraph_sizes(vllm_config: VllmConfig) -> None:
     # default or defined cudagraph_capture_sizes may not consider num_speculative_tokens>1 scenario
     # the maximum size cudagraph_capture_sizes[0] should be greater or equal than
     # (num_speculative_tokens+1)*max_num_seqs, otherwise draft model will run in eager mode
-    if vllm_config.speculative_config is not None and \
+    from vllm.config.compilation import CUDAGraphMode
-        vllm_config.speculative_config.num_speculative_tokens > 1:
+    compilation_config = vllm_config.compilation_config
     num_speculative_tokens = vllm_config.speculative_config.num_speculative_tokens
+    uniform_decode_query_len = num_speculative_tokens + 1
     max_num_seqs = vllm_config.scheduler_config.max_num_seqs
+    max_num_tokens = max_num_seqs * uniform_decode_query_len
     original_sizes, compilation_config.cudagraph_capture_sizes = \
         compilation_config.cudagraph_capture_sizes, None
+
     assert len(original_sizes) > 0
-        if original_sizes[0] < (num_speculative_tokens + 1) * max_num_seqs:
+
-            enlarged_sizes = [(num_speculative_tokens + 1) * size
+    if vllm_config.compilation_config.cudagraph_mode == CUDAGraphMode.FULL_DECODE_ONLY and \
-                              for size in original_sizes]
+        not all(size % uniform_decode_query_len == 0 for size in original_sizes):
+        enlarged_sizes = [
+            size * uniform_decode_query_len for size in original_sizes
+            if size >= uniform_decode_query_len and size *
+            uniform_decode_query_len <= max_num_tokens
+        ]
         if vllm_version_is("0.11.0"):
             compilation_config.init_with_cudagraph_sizes(enlarged_sizes)
         else:
             update_cudagraph_capture_sizes(vllm_config, enlarged_sizes)
-            logger.info(
+        logger.info("Adjusted ACL graphs: %s → %s for speculative decoding",
-                "Adjusted ACL graphs: %s → %s for speculative decoding",
+                    original_sizes, enlarged_sizes)
+    elif original_sizes[0] < max_num_tokens:
+        enlarged_sizes = [
+            size * uniform_decode_query_len for size in original_sizes
+        ]
+        if vllm_version_is("0.11.0"):
+            compilation_config.init_with_cudagraph_sizes(enlarged_sizes)
+        else:
+            update_cudagraph_capture_sizes(vllm_config, enlarged_sizes)
+        logger.info("Adjusted ACL graphs: %s → %s for speculative decoding",
                     original_sizes, enlarged_sizes)
     else:
         compilation_config.cudagraph_capture_sizes = original_sizes

vllm_ascend/worker/model_runner_v1.py

@@ -3885,7 +3885,7 @@ class NPUModelRunner(LoRAModelRunnerMixin):
             if aclgraph_mode.mixed_mode() != CUDAGraphMode.NONE:
                 aclgraph_runtime_mode = aclgraph_mode.mixed_mode()
 
-                compilation_cases = list(reversed(self.aclgraph_batch_sizes))
+                compilation_cases = sorted(self.aclgraph_batch_sizes)
 
                 try:
                     self._capture_aclgraphs(
@@ -3914,14 +3914,7 @@ class NPUModelRunner(LoRAModelRunnerMixin):
 
             if aclgraph_mode.decode_mode() == CUDAGraphMode.FULL and \
                 aclgraph_mode.separate_routine():
-                max_num_tokens = self.scheduler_config.max_num_seqs * \
+                compilation_cases_decode = sorted(self.aclgraph_batch_sizes)
-                        self.uniform_decode_query_len
-                decode_cudagraph_batch_sizes = [
-                    x for x in self.aclgraph_batch_sizes if x <= max_num_tokens
-                    and x >= self.uniform_decode_query_len
-                ]
-                compilation_cases_decode = list(
-                    reversed(decode_cudagraph_batch_sizes))
                 self._capture_aclgraphs(
                     compilation_cases=compilation_cases_decode,
                     aclgraph_runtime_mode=CUDAGraphMode.FULL,