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36 * \brief Function definitions for non-GPU builds
38 * \author Mark Abraham <mark.j.abraham@gmail.com>
42 #include "gpu_utils.h"
48 #include "gromacs/hardware/gpu_hw_info.h"
49 #include "gromacs/utility/arrayref.h"
50 #include "gromacs/utility/smalloc.h"
51 #include "gromacs/utility/stringutil.h"
54 #pragma warning(disable: 6237)
57 //! Constant used to help minimize preprocessed code
58 static constexpr bool c_binarySupportsGpus = (GMX_GPU != GMX_GPU_NONE);
60 bool canPerformGpuDetection()
62 if (c_binarySupportsGpus &&
63 getenv("GMX_DISABLE_GPU_DETECTION") == nullptr)
65 return isGpuDetectionFunctional(nullptr);
73 #if GMX_GPU == GMX_GPU_NONE
74 int gpu_info_get_stat(const gmx_gpu_info_t & /*unused*/, int /*unused*/)
76 return egpuNonexistent;
80 void free_gpu_info(const gmx_gpu_info_t *gpu_info)
82 sfree(static_cast<void*>(gpu_info->gpu_dev)); //circumvent is_pod check in sfree
85 std::vector<int> getCompatibleGpus(const gmx_gpu_info_t &gpu_info)
87 // Possible minor over-allocation here, but not important for anything
88 std::vector<int> compatibleGpus;
89 compatibleGpus.reserve(gpu_info.n_dev);
90 for (int i = 0; i < gpu_info.n_dev; i++)
92 assert(gpu_info.gpu_dev);
93 if (gpu_info_get_stat(gpu_info, i) == egpuCompatible)
95 compatibleGpus.push_back(i);
98 return compatibleGpus;
101 const char *getGpuCompatibilityDescription(const gmx_gpu_info_t &gpu_info,
104 return (index >= gpu_info.n_dev ?
105 gpu_detect_res_str[egpuNonexistent] :
106 gpu_detect_res_str[gpu_info_get_stat(gpu_info, index)]);
108 /*! \brief Help build a descriptive message in \c error if there are
109 * \c errorReasons why nonbondeds on a GPU are not supported.
111 * \returns Whether the lack of errorReasons indicate there is support. */
113 addMessageIfNotSupported(gmx::ArrayRef <const std::string> errorReasons,
116 bool isSupported = errorReasons.empty();
117 if (!isSupported && error)
119 *error = "Nonbonded interactions cannot run on GPUs: ";
120 *error += joinStrings(errorReasons, "; ") + ".";
125 bool buildSupportsNonbondedOnGpu(std::string *error)
127 std::vector<std::string> errorReasons;
130 errorReasons.emplace_back("double precision");
132 if (!c_binarySupportsGpus)
134 errorReasons.emplace_back("non-GPU build of GROMACS");
136 return addMessageIfNotSupported(errorReasons, error);