/*
* This file is part of the GROMACS molecular simulation package.
*
- * Copyright (c) 2014,2015,2017,2018,2019,2020, by the GROMACS development team, led by
+ * Copyright (c) 2014,2015,2017,2018,2019, by the GROMACS development team.
+ * Copyright (c) 2020,2021, by the GROMACS development team, led by
* Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
* and including many others, as listed in the AUTHORS file in the
* top-level source directory and at http://www.gromacs.org.
#include "config.h"
-#include <cassert>
-
-#include "gromacs/hardware/gpu_hw_info.h"
#include "gromacs/utility/arrayref.h"
-#include "gromacs/utility/smalloc.h"
+#include "gromacs/utility/enumerationhelpers.h"
#include "gromacs/utility/stringutil.h"
#ifdef _MSC_VER
# pragma warning(disable : 6237)
#endif
-//! Constant used to help minimize preprocessed code
-static constexpr bool c_binarySupportsGpus = (GMX_GPU != GMX_GPU_NONE);
-
-bool canPerformGpuDetection()
-{
- if (c_binarySupportsGpus && getenv("GMX_DISABLE_GPU_DETECTION") == nullptr)
- {
- return isGpuDetectionFunctional(nullptr);
- }
- else
- {
- return false;
- }
-}
-
-#if GMX_GPU == GMX_GPU_NONE
-DeviceStatus gpu_info_get_stat(const gmx_gpu_info_t& /*unused*/, int /*unused*/)
-{
- return DeviceStatus::Nonexistent;
-}
-#endif
-
-void free_gpu_info(const gmx_gpu_info_t* gpu_info)
+const char* enumValueToString(GpuApiCallBehavior enumValue)
{
- sfree(static_cast<void*>(gpu_info->deviceInfo)); // circumvent is_pod check in sfree
+ static constexpr gmx::EnumerationArray<GpuApiCallBehavior, const char*> s_gpuApiCallBehaviorNames = {
+ "Synchronous", "Asynchronous"
+ };
+ return s_gpuApiCallBehaviorNames[enumValue];
}
-std::vector<int> getCompatibleGpus(const gmx_gpu_info_t& gpu_info)
-{
- // Possible minor over-allocation here, but not important for anything
- std::vector<int> compatibleGpus;
- compatibleGpus.reserve(gpu_info.n_dev);
- for (int i = 0; i < gpu_info.n_dev; i++)
- {
- assert(gpu_info.deviceInfo);
- if (gpu_info_get_stat(gpu_info, i) == DeviceStatus::Compatible)
- {
- compatibleGpus.push_back(i);
- }
- }
- return compatibleGpus;
-}
-
-const char* getGpuCompatibilityDescription(const gmx_gpu_info_t& gpu_info, int index)
-{
- return (index >= gpu_info.n_dev ? c_deviceStateString[DeviceStatus::Nonexistent]
- : c_deviceStateString[gpu_info_get_stat(gpu_info, index)]);
-}
-/*! \brief Help build a descriptive message in \c error if there are
- * \c errorReasons why nonbondeds on a GPU are not supported.
- *
- * \returns Whether the lack of errorReasons indicate there is support. */
-static bool addMessageIfNotSupported(gmx::ArrayRef<const std::string> errorReasons, std::string* error)
+bool decideGpuTimingsUsage()
{
- bool isSupported = errorReasons.empty();
- if (!isSupported && error)
+ if (GMX_GPU_CUDA || GMX_GPU_SYCL)
{
- *error = "Nonbonded interactions cannot run on GPUs: ";
- *error += joinStrings(errorReasons, "; ") + ".";
+ /* CUDA: timings are incorrect with multiple streams.
+ * This is the main reason why they are disabled by default.
+ * TODO: Consider turning on by default when we can detect nr of streams.
+ *
+ * SYCL: compilers and runtimes change rapidly, so we disable timings by default
+ * to avoid any possible overhead. */
+ return (getenv("GMX_ENABLE_GPU_TIMING") != nullptr);
}
- return isSupported;
-}
-
-bool buildSupportsNonbondedOnGpu(std::string* error)
-{
- std::vector<std::string> errorReasons;
- if (GMX_DOUBLE)
+ else if (GMX_GPU_OPENCL)
{
- errorReasons.emplace_back("double precision");
+ return (getenv("GMX_DISABLE_GPU_TIMING") == nullptr);
}
- if (!c_binarySupportsGpus)
+ else
{
- errorReasons.emplace_back("non-GPU build of GROMACS");
+ // CPU-only build
+ return false;
}
- return addMessageIfNotSupported(errorReasons, error);
}