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Summary: - Adds a CompiledModule abstraction on top of Cuda run time compilation. - Adds a cache of run time compiled kernels. The cache returns a kernel immediately and leaves the kernel compiling in the background. The kernel's methods wait for the compilation to be ready. - tests that runtime API and driver API streams are interchangeable when running a dynamically generated kernel. - Add proper use of contexts, one per device. The contexts are needed because of using the driver API to handle run time compilation. - Add device properties to the Device* struct. Differential Revision: D64205005 Pulled By: oerling
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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|
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| #include <fmt/format.h> | ||
| #include <gflags/gflags.h> | ||
| #include <nvrtc.h> | ||
| #include "velox/experimental/wave/common/Cuda.h" | ||
| #include "velox/experimental/wave/common/CudaUtil.cuh" | ||
| #include "velox/experimental/wave/common/Exception.h" | ||
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| DEFINE_string( | ||
| wavegen_architecture, | ||
| "compute_70", | ||
| "--gpu-architecture flag for generated code"); | ||
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| namespace facebook::velox::wave { | ||
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| void nvrtcCheck(nvrtcResult result) { | ||
| if (result != NVRTC_SUCCESS) { | ||
| waveError(nvrtcGetErrorString(result)); | ||
| } | ||
| } | ||
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| class CompiledModuleImpl : public CompiledModule { | ||
| public: | ||
| CompiledModuleImpl(CUmodule module, std::vector<CUfunction> kernels) | ||
| : module_(module), kernels_(std::move(kernels)) {} | ||
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|
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| ~CompiledModuleImpl() { | ||
| auto result = cuModuleUnload(module_); | ||
| if (result != CUDA_SUCCESS) { | ||
| LOG(ERROR) << "Error in unloading module " << result; | ||
| } | ||
| } | ||
|
|
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| void launch( | ||
| int32_t kernelIdx, | ||
| int32_t numBlocks, | ||
| int32_t numThreads, | ||
| int32_t shared, | ||
| Stream* stream, | ||
| void** args) override; | ||
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| KernelInfo info(int32_t kernelIdx) override; | ||
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| private: | ||
| CUmodule module_; | ||
| std::vector<CUfunction> kernels_; | ||
| }; | ||
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| void addFlag( | ||
| const char* flag, | ||
| const char* value, | ||
| int32_t length, | ||
| std::vector<std::string>& data) { | ||
| std::string str(flag); | ||
| str.resize(str.size() + length + 1); | ||
| memcpy(str.data() + strlen(flag), value, length); | ||
| str.back() = 0; | ||
| data.push_back(std::move(str)); | ||
| } | ||
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| // Gets compiler options from the environment and appends them to 'opts''. The | ||
| // memory is owned by 'data'. | ||
| void getNvrtcOptions( | ||
| std::vector<const char*>& opts, | ||
| std::vector<std::string>& data) { | ||
| const char* includes = getenv("WAVE_NVRTC_INCLUDE_PATH"); | ||
| if (includes && strlen(includes) > 0) { | ||
| for (;;) { | ||
| const char* end = strchr(includes, ':'); | ||
| if (!end) { | ||
| addFlag("-I", includes, strlen(includes), data); | ||
| break; | ||
| } | ||
| addFlag("-I", includes, end - includes, data); | ||
| includes = end + 1; | ||
| } | ||
| } | ||
| const char* flags = getenv("WAVE_NVRTC_FLAGS"); | ||
| if (flags && strlen(flags)) { | ||
| for (;;) { | ||
| auto end = strchr(flags, ' '); | ||
| if (!end) { | ||
| addFlag("", flags, strlen(flags), data); | ||
| break; | ||
| } | ||
| addFlag("", flags, end - flags, data); | ||
| flags = end + 1; | ||
| } | ||
| } | ||
| for (auto& str : data) { | ||
| opts.push_back(str.data()); | ||
| } | ||
| } | ||
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| std::shared_ptr<CompiledModule> CompiledModule::create(const KernelSpec& spec) { | ||
| nvrtcProgram prog; | ||
| nvrtcCreateProgram( | ||
| &prog, | ||
| spec.code.c_str(), // buffer | ||
| spec.filePath.c_str(), // name | ||
| spec.numHeaders, // numHeaders | ||
| spec.headers, // headers | ||
| spec.headerNames); // includeNames | ||
| for (auto& name : spec.entryPoints) { | ||
| nvrtcCheck(nvrtcAddNameExpression(prog, name.c_str())); | ||
| } | ||
| std::vector<const char*> opts; | ||
| std::vector<std::string> optsData; | ||
| #ifndef NDEBUG | ||
| optsData.push_back("-G"); | ||
| #else | ||
| optsData.push_back("-O3"); | ||
| #endif | ||
| getNvrtcOptions(opts, optsData); | ||
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| auto compileResult = nvrtcCompileProgram( | ||
| prog, // prog | ||
| opts.size(), // numOptions | ||
| opts.data()); // options | ||
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| size_t logSize; | ||
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| nvrtcGetProgramLogSize(prog, &logSize); | ||
| std::string log; | ||
| log.resize(logSize); | ||
| nvrtcGetProgramLog(prog, log.data()); | ||
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| if (compileResult != NVRTC_SUCCESS) { | ||
| nvrtcDestroyProgram(&prog); | ||
| waveError(std::string("Cuda compilation error: ") + log); | ||
| } | ||
| // Obtain PTX from the program. | ||
| size_t ptxSize; | ||
| nvrtcCheck(nvrtcGetPTXSize(prog, &ptxSize)); | ||
| std::string ptx; | ||
| ptx.resize(ptxSize); | ||
| nvrtcCheck(nvrtcGetPTX(prog, ptx.data())); | ||
| std::vector<std::string> loweredNames; | ||
| for (auto& entry : spec.entryPoints) { | ||
| const char* temp; | ||
| nvrtcCheck(nvrtcGetLoweredName(prog, entry.c_str(), &temp)); | ||
| loweredNames.push_back(std::string(temp)); | ||
| } | ||
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| nvrtcDestroyProgram(&prog); | ||
| CUjit_option options[] = { | ||
| CU_JIT_INFO_LOG_BUFFER, | ||
| CU_JIT_INFO_LOG_BUFFER_SIZE_BYTES, | ||
| CU_JIT_ERROR_LOG_BUFFER, | ||
| CU_JIT_ERROR_LOG_BUFFER_SIZE_BYTES}; | ||
| char info[1024]; | ||
| char error[1024]; | ||
| uint32_t infoSize = sizeof(info); | ||
| uint32_t errorSize = sizeof(error); | ||
| void* values[] = {info, &infoSize, error, &errorSize}; | ||
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| CUmodule module; | ||
| auto loadResult = cuModuleLoadDataEx( | ||
| &module, ptx.data(), sizeof(values) / sizeof(void*), options, values); | ||
| if (loadResult != CUDA_SUCCESS) { | ||
| LOG(ERROR) << "Load error " << errorSize << " " << infoSize; | ||
| waveError(fmt::format("Error in load module: {} {}", info, error)); | ||
| } | ||
| std::vector<CUfunction> funcs; | ||
| for (auto& name : loweredNames) { | ||
| funcs.emplace_back(); | ||
| CU_CHECK(cuModuleGetFunction(&funcs.back(), module, name.c_str())); | ||
| } | ||
| return std::make_shared<CompiledModuleImpl>(module, std::move(funcs)); | ||
| } | ||
|
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| void CompiledModuleImpl::launch( | ||
| int32_t kernelIdx, | ||
| int32_t numBlocks, | ||
| int32_t numThreads, | ||
| int32_t shared, | ||
| Stream* stream, | ||
| void** args) { | ||
| auto result = cuLaunchKernel( | ||
| kernels_[kernelIdx], | ||
| numBlocks, | ||
| 1, | ||
| 1, // grid dim | ||
| numThreads, | ||
| 1, | ||
| 1, // block dim | ||
| shared, | ||
| reinterpret_cast<CUstream>(stream->stream()->stream), | ||
| args, | ||
| 0); | ||
| CU_CHECK(result); | ||
| }; | ||
|
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| KernelInfo CompiledModuleImpl::info(int32_t kernelIdx) { | ||
| KernelInfo info; | ||
| auto f = kernels_[kernelIdx]; | ||
| cuFuncGetAttribute(&info.numRegs, CU_FUNC_ATTRIBUTE_NUM_REGS, f); | ||
| cuFuncGetAttribute( | ||
| &info.sharedMemory, CU_FUNC_ATTRIBUTE_SHARED_SIZE_BYTES, f); | ||
| cuFuncGetAttribute( | ||
| &info.maxThreadsPerBlock, CU_FUNC_ATTRIBUTE_MAX_THREADS_PER_BLOCK, f); | ||
| int32_t max; | ||
| cuOccupancyMaxActiveBlocksPerMultiprocessor(&max, f, 256, 0); | ||
| info.maxOccupancy0 = max; | ||
| cuOccupancyMaxActiveBlocksPerMultiprocessor(&max, f, 256, 256 * 32); | ||
| info.maxOccupancy32 = max; | ||
| return info; | ||
| } | ||
|
|
||
| } // namespace facebook::velox::wave |
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