Merge branch 'v0.11.0-dev-rename' into 'v0.11.0-dev'

Switch default w8a8 gemm impl to blaslt.

See merge request dcutoolkit/deeplearing/vllm!365

vllm/envs.py

@@ -244,6 +244,7 @@ if TYPE_CHECKING:
     VLLM_USE_MARLIN_W16A16_MOE:bool = False
     VLLM_V1_FAST_TOKEN_ID_COPY: bool = False
     VLLM_V1_USE_REDUCED_TOPK_TOPP_SAMPLER: bool = False
+    VLLM_W8A8_BACKEND: int = 3
 
 def get_default_cache_root():
     return os.getenv(
@@ -1682,6 +1683,13 @@ environment_variables: dict[str, Callable[[], Any]] = {
     "VLLM_V1_USE_REDUCED_TOPK_TOPP_SAMPLER":
         lambda: (os.getenv("VLLM_V1_USE_REDUCED_TOPK_TOPP_SAMPLER",
                            "0").lower() in ("true", "1")),
+                           
+    # W8A8 GEMM backend selection for vLLM quantized models.
+    # lightop/triton: 1
+    # cutlass: 2 (will remove in the future)
+    # blaslt: 3 (default)
+    # rocblas: others
+    "VLLM_W8A8_BACKEND": lambda: int(os.getenv("VLLM_W8A8_BACKEND", "3")),
 }
 
 # --8<-- [end:env-vars-definition]
@@ -1780,6 +1788,7 @@ def compute_hash() -> str:
         "VLLM_ENABLE_INDUCTOR_MAX_AUTOTUNE",
         "VLLM_ENABLE_INDUCTOR_COORDINATE_DESCENT_TUNING",
         "VLLM_USE_FBGEMM",
+        "VLLM_W8A8_BACKEND",
     ]
     for key in environment_variables_to_hash:
         # if this goes out of sync with environment_variables,

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py

@@ -720,7 +720,7 @@ class CompressedTensorsLinearMethod(LinearMethodBase):
     def __init__(self, quantization_config: CompressedTensorsConfig):
         self.quantization_config = quantization_config
         self.tritonsingleton= W8a8GetCacheJSON()
-        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
+        self.w8a8_strategy = envs.VLLM_W8A8_BACKEND
         
     def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
         weights_scheme = (

vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w8a8_int8.py

@@ -7,6 +7,7 @@ import torch
 from compressed_tensors.quantization import QuantizationStrategy
 import os
 
+import vllm.envs as envs
 from vllm.logger import init_logger
 from vllm.model_executor.layers.quantization.compressed_tensors.schemes import (
     CompressedTensorsScheme)
@@ -29,7 +30,7 @@ class CompressedTensorsW8A8Int8(CompressedTensorsScheme):
                  input_symmetric: bool):
         self.strategy = strategy
         self.is_static_input_scheme = is_static_input_scheme
-        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
+        self.w8a8_strategy = envs.VLLM_W8A8_BACKEND
         self.input_symmetric = input_symmetric
 
     @classmethod

vllm/model_executor/models/falcon.py

@@ -32,6 +32,7 @@ from torch import nn
 from torch.nn import LayerNorm
 from transformers import FalconConfig as HF_FalconConfig
 
+import vllm.envs as envs
 from vllm.attention import Attention
 from vllm.compilation.decorators import support_torch_compile
 from vllm.config import CacheConfig, VllmConfig
@@ -393,7 +394,7 @@ class FalconModel(nn.Module):
         self.use_gemm_pad = os.environ.get('GEMM_PAD') == '1'
         self.use_fa_pad = os.environ.get('FA_PAD') == '1'
         self.use_awq_pad = os.environ.get('AWQ_PAD') == '1'
-        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
+        self.w8a8_strategy = envs.VLLM_W8A8_BACKEND
 
     def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.word_embeddings(input_ids)

vllm/model_executor/models/glm4.py

@@ -32,6 +32,7 @@ import torch
 from torch import nn
 from transformers import Glm4Config
 
+import vllm.envs as envs
 from vllm.attention import Attention, AttentionType
 from vllm.compilation.decorators import support_torch_compile
 from vllm.config import CacheConfig, VllmConfig
@@ -290,8 +291,7 @@ class Glm4ForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
         self.use_gemm_pad = os.environ.get('GEMM_PAD') == '1'
         self.use_fa_pad = os.environ.get('FA_PAD') == '1'
         self.use_awq_pad = os.environ.get('AWQ_PAD') == '1'
-        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
-
+        self.w8a8_strategy = envs.VLLM_W8A8_BACKEND
     def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.model.get_input_embeddings(input_ids)
 

vllm/model_executor/models/qwen3_moe.py

@@ -613,7 +613,7 @@ class Qwen3MoeModel(nn.Module):
         self.use_gemm_pad = os.environ.get('GEMM_PAD') == '1'
         self.use_fa_pad = os.environ.get('FA_PAD') == '1'
         self.use_awq_pad = os.environ.get('AWQ_PAD') == '1'
-        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
+        self.w8a8_strategy = envs.VLLM_W8A8_BACKEND
 
     def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.embed_tokens(input_ids)

vllm/model_executor/models/telechat2.py

@@ -27,6 +27,7 @@ import re
 import torch
 import torch.nn as nn
 
+from vllm.envs import envs
 from vllm.config import VllmConfig
 from vllm.model_executor.model_loader.weight_utils import default_weight_loader
 from vllm.model_executor.models.llama import LlamaForCausalLM, LlamaModel
@@ -77,7 +78,7 @@ class TeleChat2Model(LlamaModel):
         self.use_gemm_pad = os.environ.get('GEMM_PAD') == '1'
         self.use_fa_pad = os.environ.get('FA_PAD') == '1'
         self.use_awq_pad = os.environ.get('AWQ_PAD') == '1'
-        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
+        self.w8a8_strategy = envs.VLLM_W8A8_BACKEND
 
     def load_weights(self, weights: Iterable[tuple[str,
                                                    torch.Tensor]]) -> set[str]: