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119 lines
4.3 KiB
119 lines
4.3 KiB
import os
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import time
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from abc import abstractmethod
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from pathlib import Path
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from typing import List
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from .base_extension import _Extension
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from .cpp_extension import _CppExtension
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from .utils import check_pytorch_version, check_system_pytorch_cuda_match, set_cuda_arch_list
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__all__ = ["_CudaExtension"]
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# Some constants for installation checks
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MIN_PYTORCH_VERSION_MAJOR = 1
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MIN_PYTORCH_VERSION_MINOR = 10
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class _CudaExtension(_CppExtension):
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@abstractmethod
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def nvcc_flags(self) -> List[str]:
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"""
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This function should return a list of nvcc compilation flags for extensions.
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"""
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return ["-DCOLOSSAL_WITH_CUDA"]
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def is_available(self) -> bool:
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# cuda extension can only be built if cuda is available
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try:
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import torch
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# torch.cuda.is_available requires a device to exist, allow building with cuda extension on build nodes without a device
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# but where cuda is actually available.
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cuda_available = torch.cuda.is_available() or bool(os.environ.get("FORCE_CUDA", 0))
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except:
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cuda_available = False
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return cuda_available
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def assert_compatible(self) -> None:
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from torch.utils.cpp_extension import CUDA_HOME
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if not CUDA_HOME:
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raise AssertionError(
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"[extension] CUDA_HOME is not found. You need to export CUDA_HOME environment variable or install CUDA Toolkit first in order to build/load CUDA extensions"
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)
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check_system_pytorch_cuda_match(CUDA_HOME)
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check_pytorch_version(MIN_PYTORCH_VERSION_MAJOR, MIN_PYTORCH_VERSION_MINOR)
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def get_cuda_home_include(self):
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"""
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return include path inside the cuda home.
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"""
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from torch.utils.cpp_extension import CUDA_HOME
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if CUDA_HOME is None:
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raise RuntimeError("CUDA_HOME is None, please set CUDA_HOME to compile C++/CUDA kernels in ColossalAI.")
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cuda_include = os.path.join(CUDA_HOME, "include")
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return cuda_include
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def include_dirs(self) -> List[str]:
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"""
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This function should return a list of include files for extensions.
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"""
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return super().include_dirs() + [self.get_cuda_home_include()]
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def build_jit(self) -> None:
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from torch.utils.cpp_extension import CUDA_HOME, load
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set_cuda_arch_list(CUDA_HOME)
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# get build dir
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build_directory = _Extension.get_jit_extension_folder_path()
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build_directory = Path(build_directory)
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build_directory.mkdir(parents=True, exist_ok=True)
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# check if the kernel has been built
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compiled_before = False
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kernel_file_path = build_directory.joinpath(f"{self.name}.o")
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if kernel_file_path.exists():
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compiled_before = True
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# load the kernel
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if compiled_before:
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print(f"[extension] Loading the JIT-built {self.name} kernel during runtime now")
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else:
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print(f"[extension] Compiling the JIT {self.name} kernel during runtime now")
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build_start = time.time()
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op_kernel = load(
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name=self.name,
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sources=self.strip_empty_entries(self.sources_files()),
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extra_include_paths=self.strip_empty_entries(self.include_dirs()),
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extra_cflags=self.cxx_flags(),
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extra_cuda_cflags=self.nvcc_flags(),
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extra_ldflags=[],
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build_directory=str(build_directory),
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)
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build_duration = time.time() - build_start
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if compiled_before:
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print(f"[extension] Time taken to load {self.name} op: {build_duration} seconds")
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else:
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print(f"[extension] Time taken to compile {self.name} op: {build_duration} seconds")
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return op_kernel
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def build_aot(self) -> "CUDAExtension":
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from torch.utils.cpp_extension import CUDA_HOME, CUDAExtension
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set_cuda_arch_list(CUDA_HOME)
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return CUDAExtension(
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name=self.prebuilt_import_path,
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sources=self.strip_empty_entries(self.sources_files()),
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include_dirs=self.strip_empty_entries(self.include_dirs()),
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extra_compile_args={
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"cxx": self.strip_empty_entries(self.cxx_flags()),
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"nvcc": self.strip_empty_entries(self.nvcc_flags()),
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},
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)
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