[Core] manage nccl via a pypi package & upgrade to pt 2.2.1 (vllm-project#3805)

Author: youkaichao

Diff for: .github/workflows/publish.yml

@@ -49,7 +49,7 @@ jobs:
       matrix:
           os: ['ubuntu-20.04']
           python-version: ['3.8', '3.9', '3.10', '3.11']
-          pytorch-version: ['2.1.2']  # Must be the most recent version that meets requirements.txt.
+          pytorch-version: ['2.2.1']  # Must be the most recent version that meets requirements.txt.
           cuda-version: ['11.8', '12.1']
 
     steps:

Diff for: CMakeLists.txt

@@ -31,7 +31,7 @@ set(HIP_SUPPORTED_ARCHS "gfx906;gfx908;gfx90a;gfx940;gfx941;gfx942;gfx1030;gfx11
 # requirements.txt files and should be kept consistent.  The ROCm torch
 # versions are derived from Dockerfile.rocm
 #
-set(TORCH_SUPPORTED_VERSION_CUDA "2.1.2")
+set(TORCH_SUPPORTED_VERSION_CUDA "2.2.1")
 set(TORCH_SUPPORTED_VERSION_ROCM_5X "2.0.1")
 set(TORCH_SUPPORTED_VERSION_ROCM_6X "2.1.1")
 

Diff for: Dockerfile

@@ -24,6 +24,13 @@ RUN --mount=type=cache,target=/root/.cache/pip \
 COPY requirements-dev.txt requirements-dev.txt
 RUN --mount=type=cache,target=/root/.cache/pip \
     pip install -r requirements-dev.txt
+
+# cuda arch list used by torch
+# can be useful for both `dev` and `test`
+# explicitly set the list to avoid issues with torch 2.2
+# see https://github.com/pytorch/pytorch/pull/123243
+ARG torch_cuda_arch_list='7.0 7.5 8.0 8.6 8.9 9.0+PTX'
+ENV TORCH_CUDA_ARCH_LIST=${torch_cuda_arch_list}
 #################### BASE BUILD IMAGE ####################
 
 
@@ -47,9 +54,6 @@ COPY requirements.txt requirements.txt
 COPY pyproject.toml pyproject.toml
 COPY vllm/__init__.py vllm/__init__.py
 
-# cuda arch list used by torch
-ARG torch_cuda_arch_list='7.0 7.5 8.0 8.6 8.9 9.0+PTX'
-ENV TORCH_CUDA_ARCH_LIST=${torch_cuda_arch_list}
 # max jobs used by Ninja to build extensions
 ARG max_jobs=2
 ENV MAX_JOBS=${max_jobs}

Diff for: pyproject.toml

@@ -5,7 +5,7 @@ requires = [
     "ninja",
     "packaging",
     "setuptools >= 49.4.0",
-    "torch == 2.1.2",
+    "torch == 2.2.1",
     "wheel",
 ]
 build-backend = "setuptools.build_meta"

Diff for: requirements-build.txt

@@ -3,5 +3,5 @@ cmake>=3.21
 ninja
 packaging
 setuptools>=49.4.0
-torch==2.1.2
+torch==2.2.1
 wheel

Diff for: requirements.txt

@@ -4,11 +4,11 @@ psutil
 ray >= 2.9
 sentencepiece  # Required for LLaMA tokenizer.
 numpy
-torch == 2.1.2
+torch == 2.2.1
 requests
 py-cpuinfo
 transformers >= 4.39.1  # Required for StarCoder2 & Llava.
-xformers == 0.0.23.post1  # Required for CUDA 12.1.
+xformers == 0.0.25  # Requires PyTorch 2.2.1.
 fastapi
 uvicorn[standard]
 pydantic >= 2.0  # Required for OpenAI server.
@@ -17,3 +17,4 @@ pynvml == 11.5.0
 triton >= 2.1.0
 outlines == 0.0.34
 tiktoken == 0.6.0 # Required for DBRX tokenizer
+vllm-nccl-cu12>=2.18<2.19 # for downloading nccl library

Diff for: setup.py

@@ -328,6 +328,16 @@ def get_requirements() -> List[str]:
     if _is_cuda():
         with open(get_path("requirements.txt")) as f:
             requirements = f.read().strip().split("\n")
+            cuda_major = torch.version.cuda.split(".")[0]
+            modified_requirements = []
+            for req in requirements:
+                if "vllm-nccl-cu12" in req:
+                    modified_requirements.append(
+                        req.replace("vllm-nccl-cu12",
+                                    f"vllm-nccl-cu{cuda_major}"))
+                else:
+                    modified_requirements.append(req)
+            requirements = modified_requirements
     elif _is_hip():
         with open(get_path("requirements-rocm.txt")) as f:
             requirements = f.read().strip().split("\n")

Diff for: vllm/model_executor/parallel_utils/pynccl.py

@@ -21,6 +21,7 @@
 
 import ctypes
 import datetime
+import glob
 import os
 
 # ===================== import region =====================
@@ -34,18 +35,27 @@
 
 so_file = os.environ.get("VLLM_NCCL_SO_PATH", "")
 
+# check if we have vllm-managed nccl
+vllm_nccl_path = None
+if torch.version.cuda is not None:
+    cuda_major = torch.version.cuda.split(".")[0]
+    path = os.path.expanduser(
+        f"~/.config/vllm/nccl/cu{cuda_major}/libnccl.so.*")
+    files = glob.glob(path)
+    vllm_nccl_path = files[0] if files else None
+
 # manually load the nccl library
 if so_file:
     logger.info(
         f"Loading nccl from environment variable VLLM_NCCL_SO_PATH={so_file}")
 else:
     if torch.version.cuda is not None:
-        so_file = "libnccl.so.2"
+        so_file = vllm_nccl_path or "libnccl.so.2"
     elif torch.version.hip is not None:
         so_file = "librccl.so.1"
     else:
         raise ValueError("NCCL only supports CUDA and ROCm backends.")
-    logger.debug(f"Loading nccl from library {so_file}")
+    logger.info(f"Loading nccl from library {so_file}")
 
 try:
     nccl = ctypes.CDLL(so_file)