mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 08:18:32 +00:00
139 lines
4.0 KiB
Go
139 lines
4.0 KiB
Go
/**
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# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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**/
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package cuda
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import (
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"fmt"
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"github.com/NVIDIA/go-nvml/pkg/dl"
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)
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/*
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#cgo linux LDFLAGS: -Wl,--export-dynamic -Wl,--unresolved-symbols=ignore-in-object-files
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#cgo darwin LDFLAGS: -Wl,-undefined,dynamic_lookup
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#ifdef _WIN32
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#define CUDAAPI __stdcall
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#else
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#define CUDAAPI
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#endif
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typedef int CUdevice;
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typedef enum CUdevice_attribute_enum {
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CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR = 75,
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CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR = 76
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} CUdevice_attribute;
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typedef enum cudaError_enum {
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CUDA_SUCCESS = 0
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} CUresult;
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CUresult CUDAAPI cuInit(unsigned int Flags);
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CUresult CUDAAPI cuDriverGetVersion(int *driverVersion);
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CUresult CUDAAPI cuDeviceGet(CUdevice *device, int ordinal);
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CUresult CUDAAPI cuDeviceGetAttribute(int *pi, CUdevice_attribute attrib, CUdevice dev);
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*/
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import "C"
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const (
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libraryName = "libcuda.so.1"
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libraryLoadFlags = dl.RTLD_LAZY | dl.RTLD_GLOBAL
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)
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// cuda stores a reference the cuda dynamic library
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var lib *dl.DynamicLibrary
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// Version returns the CUDA version of the driver as a string or an error if this
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// cannot be determined.
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func Version() (string, error) {
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lib, err := load()
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if err != nil {
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return "", err
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}
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defer lib.Close()
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if err := lib.Lookup("cuDriverGetVersion"); err != nil {
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return "", fmt.Errorf("failed to lookup symbol: %v", err)
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}
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var version C.int
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if result := C.cuDriverGetVersion(&version); result != C.CUDA_SUCCESS {
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return "", fmt.Errorf("failed to get CUDA version: result=%v", result)
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}
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major := version / 1000
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minor := version % 100 / 10
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return fmt.Sprintf("%d.%d", major, minor), nil
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}
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// ComputeCapability returns the CUDA compute capability of a device with the specified index as a string
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// or an error if this cannot be determined.
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func ComputeCapability(index int) (string, error) {
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lib, err := load()
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if err != nil {
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return "", err
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}
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defer lib.Close()
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if err := lib.Lookup("cuInit"); err != nil {
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return "", fmt.Errorf("failed to lookup symbol: %v", err)
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}
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if err := lib.Lookup("cuDeviceGet"); err != nil {
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return "", fmt.Errorf("failed to lookup symbol: %v", err)
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}
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if err := lib.Lookup("cuDeviceGetAttribute"); err != nil {
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return "", fmt.Errorf("failed to lookup symbol: %v", err)
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}
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if result := C.cuInit(C.uint(0)); result != C.CUDA_SUCCESS {
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return "", fmt.Errorf("failed to initialize CUDA: result=%v", result)
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}
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var device C.CUdevice
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// NOTE: We only query the first device
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if result := C.cuDeviceGet(&device, C.int(index)); result != C.CUDA_SUCCESS {
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return "", fmt.Errorf("failed to get CUDA device %v: result=%v", 0, result)
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}
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var major C.int
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if result := C.cuDeviceGetAttribute(&major, C.CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR, device); result != C.CUDA_SUCCESS {
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return "", fmt.Errorf("failed to get CUDA compute capability major for device %v : result=%v", 0, result)
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}
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var minor C.int
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if result := C.cuDeviceGetAttribute(&minor, C.CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR, device); result != C.CUDA_SUCCESS {
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return "", fmt.Errorf("failed to get CUDA compute capability minor for device %v: result=%v", 0, result)
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}
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return fmt.Sprintf("%d.%d", major, minor), nil
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}
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func load() (*dl.DynamicLibrary, error) {
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lib := dl.New(libraryName, libraryLoadFlags)
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if lib == nil {
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return nil, fmt.Errorf("error instantiating DynamicLibrary for CUDA")
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}
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err := lib.Open()
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if err != nil {
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return nil, fmt.Errorf("error opening DynamicLibrary for CUDA: %v", err)
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}
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return lib, nil
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}
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