[Qwen3.5] Set full attn_backend to trtllm_mha on SM100 by default when possible (#19030)
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hlu1
@@ -1597,25 +1597,6 @@ class ServerArgs:
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elif model_arch in [
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"Qwen3MoeForCausalLM",
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"Qwen3VLMoeForConditionalGeneration",
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]:
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if is_sm100_supported():
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quant_method = get_quantization_config(hf_config)
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if self.quantization is None and quant_method is not None:
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self.quantization = quant_method
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if (
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(
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self.quantization in ("fp8", "modelopt_fp4")
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or self.quantization is None
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)
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and self.moe_a2a_backend == "none"
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and self.moe_runner_backend == "auto"
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):
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self.moe_runner_backend = "flashinfer_trtllm"
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logger.info(
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"Use flashinfer_trtllm as MoE runner backend on sm100 for "
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f"{model_arch}"
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)
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elif model_arch in [
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"Qwen3NextForCausalLM",
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"Qwen3_5MoeForConditionalGeneration",
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"Qwen3_5ForConditionalGeneration",
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@@ -1634,13 +1615,38 @@ class ServerArgs:
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):
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self.moe_runner_backend = "flashinfer_trtllm"
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logger.info(
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f"Use flashinfer_trtllm as MoE runner backend on sm100 for {model_arch}"
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"Use flashinfer_trtllm as MoE runner backend on sm100 for "
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f"{model_arch}"
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)
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if model_arch in [
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"Qwen3NextForCausalLM",
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"Qwen3_5MoeForConditionalGeneration",
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"Qwen3_5ForConditionalGeneration",
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]:
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sm100_default_attn_backend = "triton"
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if is_sm100_supported():
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# trtllm_mha requires speculative_eagle_topk == 1 and page_size > 1.
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# _get_default_attn_backend handles the eagle_topk check.
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# There is only one case where page_size=1 is required,
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# which is when radix cache is enabled and both extra_buffer
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# and spec decoding are disabled.
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default_attn_backend = self._get_default_attn_backend(
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use_mla_backend=self.use_mla_backend(),
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model_config=self.get_model_config(),
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)
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if default_attn_backend == "trtllm_mha" and not (
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not self.enable_mamba_extra_buffer()
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and not self.disable_radix_cache
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and self.speculative_algorithm is None
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):
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sm100_default_attn_backend = "trtllm_mha"
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self._handle_mamba_radix_cache(
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model_arch=model_arch,
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support_mamba_cache=True,
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support_mamba_cache_extra_buffer=True,
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sm100_default_attention_backend="triton",
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sm100_default_attention_backend=sm100_default_attn_backend,
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)
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elif model_arch in ["Glm4MoeForCausalLM"]:
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@@ -1815,17 +1821,7 @@ class ServerArgs:
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"flashinfer" if is_flashinfer_available() else "pytorch"
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)
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def _handle_attention_backend_compatibility(self):
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model_config = self.get_model_config()
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use_mla_backend = self.use_mla_backend()
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if self.prefill_attention_backend is not None and (
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self.prefill_attention_backend == self.decode_attention_backend
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): # override the default attention backend
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self.attention_backend = self.prefill_attention_backend
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# Pick the default attention backend if not specified
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if self.attention_backend is None:
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def _get_default_attn_backend(self, use_mla_backend: bool, model_config):
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"""
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Auto select the fastest attention backend.
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@@ -1839,14 +1835,13 @@ class ServerArgs:
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2.2 We will use Flashinfer backend on blackwell.
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2.3 Otherwise, we will use triton backend.
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"""
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if not use_mla_backend:
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# MHA architecture
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if is_hopper_with_cuda_12_3() and is_no_spec_infer_or_topk_one(self):
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# Note: flashinfer 0.6.1 caused performance regression on Hopper attention kernel
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# Before the kernel is fixed, we choose fa3 as the default backend on Hopper MHA
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# ref: https://github.com/sgl-project/sglang/issues/17411
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self.attention_backend = "fa3"
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return "fa3"
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elif (
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is_sm100_supported()
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and is_no_spec_infer_or_topk_one(self)
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@@ -1855,28 +1850,41 @@ class ServerArgs:
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or self.speculative_eagle_topk is not None
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)
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):
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self.attention_backend = "trtllm_mha"
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return "trtllm_mha"
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elif is_hip():
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self.attention_backend = "aiter"
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return "aiter"
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else:
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self.attention_backend = (
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"flashinfer" if is_flashinfer_available() else "triton"
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)
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return "flashinfer" if is_flashinfer_available() else "triton"
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else:
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# MLA architecture
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if is_hopper_with_cuda_12_3():
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self.attention_backend = "fa3"
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return "fa3"
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elif is_sm100_supported():
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self.attention_backend = "flashinfer"
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return "flashinfer"
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elif is_hip():
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head_num = model_config.get_num_kv_heads(self.tp_size)
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# TODO current aiter only support head number 16 or 128 head number
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if head_num == 128 or head_num == 16:
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self.attention_backend = "aiter"
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return "aiter"
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else:
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self.attention_backend = "triton"
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return "triton"
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else:
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self.attention_backend = "triton"
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return "triton"
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def _handle_attention_backend_compatibility(self):
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model_config = self.get_model_config()
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use_mla_backend = self.use_mla_backend()
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if self.prefill_attention_backend is not None and (
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self.prefill_attention_backend == self.decode_attention_backend
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): # override the default attention backend
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self.attention_backend = self.prefill_attention_backend
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# Pick the default attention backend if not specified
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if self.attention_backend is None:
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self.attention_backend = self._get_default_attn_backend(
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use_mla_backend, model_config
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)
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logger.info(
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f"Attention backend not specified. Use {self.attention_backend} backend by default."
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