278 lines
8.1 KiB
C++
278 lines
8.1 KiB
C++
#pragma once
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/******************************/
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#include <sys/time.h>
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static inline double rtc(void)
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{
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struct timeval Tvalue;
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double etime;
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struct timezone dummy;
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gettimeofday(&Tvalue,&dummy);
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etime = (double) Tvalue.tv_sec +
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1.e-6*((double) Tvalue.tv_usec);
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return etime;
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}
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/******************************/
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#include <cassert>
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#include <iostream>
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#include <cuda.h>
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#include "drvapi_error_string.h"
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#define checkCudaErrors(err) __checkCudaErrors (err, __FILE__, __LINE__)
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// These are the inline versions for all of the SDK helper functions
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void __checkCudaErrors(CUresult err, const char *file, const int line) {
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if(CUDA_SUCCESS != err) {
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std::cerr << "checkCudeErrors() Driver API error = " << err << "\""
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<< getCudaDrvErrorString(err) << "\" from file <" << file
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<< ", line " << line << "\n";
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exit(-1);
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}
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}
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/******************************/
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/**** Basic CUDriver API ****/
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/******************************/
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CUcontext context;
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static void createContext(
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const int deviceId = 0,
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const size_t stackLimit = 4*1024,
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const size_t heapLimit = 1024*1024*1024
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)
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{
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CUdevice device;
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int devCount;
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checkCudaErrors(cuInit(0));
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checkCudaErrors(cuDeviceGetCount(&devCount));
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assert(devCount > 0);
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checkCudaErrors(cuDeviceGet(&device, deviceId < devCount ? deviceId : 0));
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char name[128];
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checkCudaErrors(cuDeviceGetName(name, 128, device));
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std::cout << "Using CUDA Device [0]: " << name << "\n";
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int devMajor, devMinor;
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checkCudaErrors(cuDeviceComputeCapability(&devMajor, &devMinor, device));
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std::cout << "Device Compute Capability: "
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<< devMajor << "." << devMinor << "\n";
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if (devMajor < 2) {
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std::cerr << "ERROR: Device 0 is not SM 2.0 or greater\n";
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exit(1);
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}
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// Create driver context
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checkCudaErrors(cuCtxCreate(&context, 0, device));
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#if 0
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size_t limit;
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checkCudaErrors(cuCtxGetLimit(&limit, CU_LIMIT_STACK_SIZE));
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fprintf(stderr, " stack_limit= %llu KB\n", limit/1024);
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checkCudaErrors(cuCtxGetLimit(&limit, CU_LIMIT_MALLOC_HEAP_SIZE));
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fprintf(stderr, " heap_limit= %llu KB\n", limit/1024);
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checkCudaErrors(cuCtxSetLimit(CU_LIMIT_STACK_SIZE,stackLimit));
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checkCudaErrors(cuCtxSetLimit(CU_LIMIT_MALLOC_HEAP_SIZE,heapLimit));
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#endif
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}
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static void destroyContext()
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{
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checkCudaErrors(cuCtxDestroy(context));
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}
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static CUmodule loadModule(
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const char * module,
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const int maxrregcount = 64,
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const char cudadevrt_lib[] = "libcudadevrt.a",
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const size_t log_size = 32768,
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const bool print_log = true
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)
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{
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const double t0 = rtc();
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CUmodule cudaModule;
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// in this branch we use compilation with parameters
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CUlinkState CUState;
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CUlinkState *lState = &CUState;
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const int nOptions = 8;
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CUjit_option options[nOptions];
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void* optionVals[nOptions];
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float walltime;
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size_t logSize = log_size;
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char error_log[logSize],
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info_log[logSize];
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void *cuOut;
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size_t outSize;
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int myErr = 0;
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// Setup linker options
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// Return walltime from JIT compilation
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options[0] = CU_JIT_WALL_TIME;
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optionVals[0] = (void*) &walltime;
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// Pass a buffer for info messages
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options[1] = CU_JIT_INFO_LOG_BUFFER;
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optionVals[1] = (void*) info_log;
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// Pass the size of the info buffer
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options[2] = CU_JIT_INFO_LOG_BUFFER_SIZE_BYTES;
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optionVals[2] = (void*) logSize;
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// Pass a buffer for error message
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options[3] = CU_JIT_ERROR_LOG_BUFFER;
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optionVals[3] = (void*) error_log;
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// Pass the size of the error buffer
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options[4] = CU_JIT_ERROR_LOG_BUFFER_SIZE_BYTES;
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optionVals[4] = (void*) logSize;
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// Make the linker verbose
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options[5] = CU_JIT_LOG_VERBOSE;
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optionVals[5] = (void*) 1;
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// Max # of registers/pthread
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options[6] = CU_JIT_MAX_REGISTERS;
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int jitRegCount = maxrregcount;
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optionVals[6] = (void *)(size_t)jitRegCount;
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// Caching
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options[7] = CU_JIT_CACHE_MODE;
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optionVals[7] = (void *)CU_JIT_CACHE_OPTION_CA;
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// Create a pending linker invocation
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// Create a pending linker invocation
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checkCudaErrors(cuLinkCreate(nOptions,options, optionVals, lState));
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#if 0
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if (sizeof(void *)==4)
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{
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// Load the PTX from the string myPtx32
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printf("Loading myPtx32[] program\n");
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// PTX May also be loaded from file, as per below.
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myErr = cuLinkAddData(*lState, CU_JIT_INPUT_PTX, (void*)myPtx32, strlen(myPtx32)+1, 0, 0, 0, 0);
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}
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else
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#endif
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{
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// Load the PTX from the string myPtx (64-bit)
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fprintf(stderr, "Loading ptx..\n");
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myErr = cuLinkAddData(*lState, CU_JIT_INPUT_PTX, (void*)module, strlen(module)+1, 0, 0, 0, 0);
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myErr = cuLinkAddFile(*lState, CU_JIT_INPUT_LIBRARY, cudadevrt_lib, 0,0,0);
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// PTX May also be loaded from file, as per below.
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// myErr = cuLinkAddFile(*lState, CU_JIT_INPUT_PTX, "myPtx64.ptx",0,0,0);
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}
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// Complete the linker step
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myErr = cuLinkComplete(*lState, &cuOut, &outSize);
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if ( myErr != CUDA_SUCCESS )
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{
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// Errors will be put in error_log, per CU_JIT_ERROR_LOG_BUFFER option above.
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fprintf(stderr,"PTX Linker Error:\n%s\n",error_log);
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assert(0);
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}
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// Linker walltime and info_log were requested in options above.
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if (print_log)
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fprintf(stderr, "CUDA Link Completed in %fms [ %g ms]. Linker Output:\n%s\n",walltime,info_log,1e3*(rtc() - t0));
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// Load resulting cuBin into module
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checkCudaErrors(cuModuleLoadData(&cudaModule, cuOut));
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// Destroy the linker invocation
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checkCudaErrors(cuLinkDestroy(*lState));
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fprintf(stderr, " loadModule took %g ms \n", 1e3*(rtc() - t0));
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return cudaModule;
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}
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static void unloadModule(CUmodule &cudaModule)
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{
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checkCudaErrors(cuModuleUnload(cudaModule));
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}
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static CUfunction getFunction(CUmodule &cudaModule, const char * function)
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{
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CUfunction cudaFunction;
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checkCudaErrors(cuModuleGetFunction(&cudaFunction, cudaModule, function));
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return cudaFunction;
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}
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static CUdeviceptr deviceMalloc(const size_t size)
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{
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CUdeviceptr d_buf;
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checkCudaErrors(cuMemAlloc(&d_buf, size));
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return d_buf;
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}
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static void deviceFree(CUdeviceptr d_buf)
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{
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checkCudaErrors(cuMemFree(d_buf));
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}
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static void memcpyD2H(void * h_buf, CUdeviceptr d_buf, const size_t size)
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{
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checkCudaErrors(cuMemcpyDtoH(h_buf, d_buf, size));
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}
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static void memcpyH2D(CUdeviceptr d_buf, void * h_buf, const size_t size)
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{
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checkCudaErrors(cuMemcpyHtoD(d_buf, h_buf, size));
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}
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#define deviceLaunch(func,params) \
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checkCudaErrors(cuFuncSetCacheConfig((func), CU_FUNC_CACHE_PREFER_L1)); \
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checkCudaErrors( \
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cuLaunchKernel( \
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(func), \
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1,1,1, \
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32, 1, 1, \
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0, NULL, (params), NULL \
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));
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typedef CUdeviceptr devicePtr;
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/**************/
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#include <vector>
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static std::vector<char> readBinary(const char * filename, const bool print_size = false)
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{
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std::vector<char> buffer;
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FILE *fp = fopen(filename, "rb");
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if (!fp )
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{
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fprintf(stderr, "file %s not found\n", filename);
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assert(0);
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}
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fseek(fp, 0, SEEK_END);
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const unsigned long long size = ftell(fp); /*calc the size needed*/
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fseek(fp, 0, SEEK_SET);
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buffer.resize(size);
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if (fp == NULL){ /*ERROR detection if file == empty*/
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fprintf(stderr, "Error: There was an Error reading the file %s \n",filename);
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exit(1);
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}
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else if (fread(&buffer[0], sizeof(char), size, fp) != size){ /* if count of read bytes != calculated size of .bin file -> ERROR*/
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fprintf(stderr, "Error: There was an Error reading the file %s \n", filename);
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exit(1);
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}
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if (print_size)
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fprintf(stderr, " read buffer of size= %d bytes \n", (int)buffer.size());
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return buffer;
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}
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static double CUDALaunch(
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void **handlePtr,
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const char * func_name,
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void **func_args,
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const bool print_log = true,
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const int maxrregcount = 64,
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const char kernel_file[] = "__kernels.ptx",
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const char cudadevrt_lib[] = "libcudadevrt.a",
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const int log_size = 32768)
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{
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const std::vector<char> module_str = readBinary(kernel_file, print_log);
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const char * module = &module_str[0];
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CUmodule cudaModule = loadModule(module, maxrregcount, cudadevrt_lib, log_size, print_log);
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CUfunction cudaFunction = getFunction(cudaModule, func_name);
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const double t0 = rtc();
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deviceLaunch(cudaFunction, func_args);
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checkCudaErrors(cuStreamSynchronize(0));
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const double dt = rtc() - t0;
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unloadModule(cudaModule);
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return dt;
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}
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/******************************/
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