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36 * \brief Define infrastructure for OpenCL JIT compilation for Gromacs
38 * \author Dimitrios Karkoulis <dimitris.karkoulis@gmail.com>
39 * \author Anca Hamuraru <anca@streamcomputing.eu>
40 * \author Teemu Virolainen <teemu@streamcomputing.eu>
41 * \author Mark Abraham <mark.j.abraham@gmail.com>
46 #include "ocl_compiler.h"
55 #include "gromacs/gpu_utils/oclutils.h"
56 #include "gromacs/utility/cstringutil.h"
57 #include "gromacs/utility/exceptions.h"
58 #include "gromacs/utility/gmxassert.h"
59 #include "gromacs/utility/path.h"
60 #include "gromacs/utility/programcontext.h"
61 #include "gromacs/utility/scoped_cptr.h"
62 #include "gromacs/utility/smalloc.h"
63 #include "gromacs/utility/stringutil.h"
64 #include "gromacs/utility/textreader.h"
66 #include "ocl_caching.h"
73 /*! \brief True if OpenCL binary caching is enabled.
75 * Currently caching is disabled by default unless the env var override
76 * is used until we resolve concurrency issues. */
77 static bool useBuildCache = getenv("GMX_OCL_GENCACHE"); // (NULL == getenv("GMX_OCL_NOGENCACHE"));
79 /*! \brief Handles writing the OpenCL JIT compilation log to \c fplog.
81 * If \c fplog is non-null and either the GMX_OCL_DUMP_LOG environment
82 * variable is set or the compilation failed, then the OpenCL
83 * compilation log is written.
85 * \param fplog Open file pointer to log file
86 * \param program OpenCL program that was compiled
87 * \param deviceId Id of the device for which compilation took place
88 * \param kernelFilename File name containing the kernel
89 * \param preprocessorOptions String containing the preprocessor command-line options used for the build
90 * \param buildFailed Whether the OpenCL build succeeded
92 * \throws std::bad_alloc if out of memory */
94 writeOclBuildLog(FILE *fplog,
96 cl_device_id deviceId,
97 const std::string &kernelFilename,
98 const std::string &preprocessorOptions,
101 bool writeOutput = ((fplog != nullptr) &&
102 (buildFailed || (getenv("GMX_OCL_DUMP_LOG") != nullptr)));
109 // Get build log string size
111 cl_int cl_error = clGetProgramBuildInfo(program,
113 CL_PROGRAM_BUILD_LOG,
117 if (cl_error != CL_SUCCESS)
119 GMX_THROW(InternalError("Could not get OpenCL program build log size, error was " + ocl_get_error_string(cl_error)));
122 char *buildLog = nullptr;
123 scoped_cptr<char> buildLogGuard;
124 if (buildLogSize != 0)
126 /* Allocate memory to fit the build log,
127 it can be very large in case of errors */
128 snew(buildLog, buildLogSize);
129 buildLogGuard.reset(buildLog);
131 /* Get the actual compilation log */
132 cl_error = clGetProgramBuildInfo(program,
134 CL_PROGRAM_BUILD_LOG,
138 if (cl_error != CL_SUCCESS)
140 GMX_THROW(InternalError("Could not get OpenCL program build log, error was " + ocl_get_error_string(cl_error)));
147 message += "Compilation of source file " + kernelFilename + " failed!\n";
151 message += "Compilation of source file " + kernelFilename + " was successful!\n";
153 message += "-- Used build options: " + preprocessorOptions + "\n";
154 message += "--------------LOG START---------------\n";
156 message += "---------------LOG END----------------\n";;
158 fputs(message.c_str(), fplog);
161 /*! \brief Construct compiler options string
163 * \param deviceVendorId Device vendor id. Used to
164 * automatically enable some vendor-specific options
165 * \return The string with the compiler options
168 selectCompilerOptions(ocl_vendor_id_t deviceVendorId)
170 std::string compilerOptions;
172 if (getenv("GMX_OCL_NOOPT") )
174 compilerOptions += " -cl-opt-disable";
177 if (getenv("GMX_OCL_FASTMATH") )
179 compilerOptions += " -cl-fast-relaxed-math";
182 if ((deviceVendorId == OCL_VENDOR_NVIDIA) && getenv("GMX_OCL_VERBOSE"))
184 compilerOptions += " -cl-nv-verbose";
187 if ((deviceVendorId == OCL_VENDOR_AMD) && getenv("GMX_OCL_DUMP_INTERM_FILES"))
189 /* To dump OpenCL build intermediate files, caching must be off */
192 compilerOptions += " -save-temps";
196 if ( ( deviceVendorId == OCL_VENDOR_AMD ) && getenv("GMX_OCL_DEBUG"))
198 compilerOptions += " -g";
201 return compilerOptions;
204 /*! \brief Get the path to the main folder storing OpenCL kernels.
206 * By default, this function constructs the full path to the OpenCL from
207 * the known location of the binary that is running, so that we handle
208 * both in-source and installed builds. The user can override this
209 * behavior by defining GMX_OCL_FILE_PATH environment variable.
211 * \return OS-normalized path string to the main folder storing OpenCL kernels
213 * \throws std::bad_alloc if out of memory.
214 * FileIOError if GMX_OCL_FILE_PATH does not specify a readable path
219 std::string kernelRootPath;
220 /* Use GMX_OCL_FILE_PATH if the user has defined it */
221 const char *gmxOclFilePath = getenv("GMX_OCL_FILE_PATH");
223 if (gmxOclFilePath == nullptr)
225 /* Normal way of getting ocl_root_dir. First get the right
226 root path from the path to the binary that is running. */
227 InstallationPrefixInfo info = getProgramContext().installationPrefix();
228 std::string dataPathSuffix = (info.bSourceLayout ?
229 "src/gromacs/mdlib/nbnxn_ocl" :
231 kernelRootPath = Path::join(info.path, dataPathSuffix);
235 if (!Directory::exists(gmxOclFilePath))
237 GMX_THROW(FileIOError(formatString("GMX_OCL_FILE_PATH must point to the directory where OpenCL"
238 "kernels are found, but '%s' does not exist", gmxOclFilePath)));
240 kernelRootPath = gmxOclFilePath;
243 // Make sure we return an OS-correct path format
244 return Path::normalize(kernelRootPath);
247 /*! \brief Get the warp size reported by device
249 * This is platform implementation dependant and seems to only work on the Nvidia and AMD platforms!
250 * Nvidia reports 32, AMD for GPU 64. Ignore the rest
252 * \param context Current OpenCL context
253 * \param deviceId OpenCL device with the context
254 * \return cl_int value of the warp size
256 * \throws InternalError if an OpenCL error was encountered
259 getWarpSize(cl_context context, cl_device_id deviceId)
262 const char *warpSizeKernel = "__kernel void test(__global int* test){test[get_local_id(0)] = 0;}";
263 cl_program program = clCreateProgramWithSource(context, 1, (const char**)&warpSizeKernel, NULL, &cl_error);
264 if (cl_error != CL_SUCCESS)
266 GMX_THROW(InternalError("Could not create OpenCL program to determine warp size, error was " + ocl_get_error_string(cl_error)));
269 cl_error = clBuildProgram(program, 0, NULL, NULL, NULL, NULL);
270 if (cl_error != CL_SUCCESS)
272 GMX_THROW(InternalError("Could not build OpenCL program to determine warp size, error was " + ocl_get_error_string(cl_error)));
275 cl_kernel kernel = clCreateKernel(program, "test", &cl_error);
276 if (cl_error != CL_SUCCESS)
278 GMX_THROW(InternalError("Could not create OpenCL kernel to determine warp size, error was " + ocl_get_error_string(cl_error)));
282 cl_error = clGetKernelWorkGroupInfo(kernel, deviceId, CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE,
283 sizeof(warpSize), &warpSize, NULL);
284 if (cl_error != CL_SUCCESS)
286 GMX_THROW(InternalError("Could not measure OpenCL warp size, error was " + ocl_get_error_string(cl_error)));
290 GMX_THROW(InternalError(formatString("Did not measure a valid OpenCL warp size")));
293 cl_error = clReleaseKernel(kernel);
294 if (cl_error != CL_SUCCESS)
296 GMX_THROW(InternalError("Could not release OpenCL warp-size kernel, error was " + ocl_get_error_string(cl_error)));
298 cl_error = clReleaseProgram(program);
299 if (cl_error != CL_SUCCESS)
301 GMX_THROW(InternalError("Could not release OpenCL warp-size program, error was " + ocl_get_error_string(cl_error)));
307 /*! \brief Select a compilation-line define for a vendor-specific kernel choice from vendor id
309 * \param[in] vendorId Vendor id enumerator
311 * \return The appropriate compilation-line define
314 makeVendorFlavorChoice(ocl_vendor_id_t vendorId)
320 choice = "-D_AMD_SOURCE_";
322 case OCL_VENDOR_NVIDIA:
323 choice = "-D_NVIDIA_SOURCE_";
326 choice = "-D_WARPLESS_SOURCE_";
332 /*! \brief Create include paths for kernel sources.
334 * All OpenCL kernel files are expected to be stored in one single folder.
336 * \throws std::bad_alloc if out of memory.
338 static std::string makeKernelIncludePathOption(const std::string &unescapedKernelRootPath)
340 std::string includePathOption;
342 /* Apple does not seem to accept the quoted include paths other
343 * OpenCL implementations are happy with. Since the standard still says
344 * it should be quoted, we handle Apple as a special case.
347 includePathOption += "-I";
349 // Prepend all the spaces with a backslash
350 for (std::string::size_type i = 0; i < unescapedKernelRootPath.length(); i++)
352 if (unescapedKernelRootPath[i] == ' ')
354 includePathOption.push_back('\\');
356 includePathOption.push_back(unescapedKernelRootPath[i]);
359 includePathOption += "-I\"" + unescapedKernelRootPath + "\"";
362 return includePathOption;
365 /*! \brief Builds a string with build options for the OpenCL kernels
367 * \throws std::bad_alloc if out of memory. */
369 makePreprocessorOptions(const std::string &kernelRootPath,
371 ocl_vendor_id_t deviceVendorId,
372 const std::string &extraDefines)
374 std::string preprocessorOptions;
376 /* Compose the complete build options */
377 preprocessorOptions = formatString("-DWARP_SIZE_TEST=%d", static_cast<int>(warpSize));
378 preprocessorOptions += ' ';
379 preprocessorOptions += makeVendorFlavorChoice(deviceVendorId);
380 preprocessorOptions += ' ';
381 preprocessorOptions += extraDefines;
382 preprocessorOptions += ' ';
383 preprocessorOptions += selectCompilerOptions(deviceVendorId);
384 preprocessorOptions += ' ';
385 preprocessorOptions += makeKernelIncludePathOption(kernelRootPath);
387 return preprocessorOptions;
391 compileProgram(FILE *fplog,
392 const std::string &kernelBaseFilename,
393 const std::string &extraDefines,
395 cl_device_id deviceId,
396 ocl_vendor_id_t deviceVendorId)
399 std::string kernelRootPath = getKernelRootPath();
401 GMX_RELEASE_ASSERT(fplog != nullptr, "Need a valid log file for building OpenCL programs");
403 /* Load OpenCL source files */
404 std::string kernelFilename = Path::join(kernelRootPath,
407 /* Make the build options */
408 std::string preprocessorOptions = makePreprocessorOptions(kernelRootPath,
409 getWarpSize(context, deviceId),
413 bool buildCacheWasRead = false;
415 std::string cacheFilename;
418 cacheFilename = makeBinaryCacheFilename(kernelBaseFilename, deviceId);
421 /* Create OpenCL program */
422 cl_program program = nullptr;
425 if (File::exists(cacheFilename, File::returnFalseOnError))
427 /* Check if there's a valid cache available */
430 program = makeProgramFromCache(cacheFilename, context, deviceId);
431 buildCacheWasRead = true;
433 catch (FileIOError &e)
435 // Failing to read from the cache is not a critical error
436 formatExceptionMessageToFile(fplog, e);
441 fprintf(fplog, "No OpenCL binary cache file was present, so will compile kernels normally.\n");
444 if (program == nullptr)
446 // Compile OpenCL program from source
447 std::string kernelSource = TextReader::readFileToString(kernelFilename);
448 if (kernelSource.empty())
450 GMX_THROW(FileIOError("Error loading OpenCL code " + kernelFilename));
452 const char *kernelSourcePtr = kernelSource.c_str();
453 size_t kernelSourceSize = kernelSource.size();
454 /* Create program from source code */
455 program = clCreateProgramWithSource(context,
460 if (cl_error != CL_SUCCESS)
462 GMX_THROW(InternalError("Could not create OpenCL program, error was " + ocl_get_error_string(cl_error)));
466 /* Build the OpenCL program, keeping the status to potentially
467 write to the simulation log file. */
468 cl_int buildStatus = clBuildProgram(program, 0, NULL, preprocessorOptions.c_str(), NULL, NULL);
470 /* Write log first, and then throw exception that the user know what is
471 the issue even if the build fails. */
472 writeOclBuildLog(fplog,
477 buildStatus != CL_SUCCESS);
479 if (buildStatus != CL_SUCCESS)
481 GMX_THROW(InternalError("Could not build OpenCL program, error was " + ocl_get_error_string(buildStatus)));
486 if (!buildCacheWasRead)
488 /* If OpenCL caching is ON, but the current cache is not
489 valid => update it */
492 writeBinaryToCache(program, cacheFilename);
494 catch (GromacsException &e)
496 // Failing to write the cache is not a critical error
497 formatExceptionMessageToFile(fplog, e);
501 if ((OCL_VENDOR_NVIDIA == deviceVendorId) && getenv("GMX_OCL_DUMP_INTERM_FILES"))
503 /* If dumping intermediate files has been requested and this is an NVIDIA card
504 => write PTX to file */
507 cl_error = clGetDeviceInfo(deviceId, CL_DEVICE_NAME, sizeof(buffer), buffer, NULL);
508 if (cl_error != CL_SUCCESS)
510 GMX_THROW(InternalError("Could not get OpenCL device info, error was " + ocl_get_error_string(cl_error)));
512 std::string ptxFilename = buffer;
513 ptxFilename += ".ptx";
517 writeBinaryToCache(program, ptxFilename);
519 catch (GromacsException &e)
521 // Failing to write the cache is not a critical error
522 formatExceptionMessageToFile(fplog, e);