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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 /*! \brief Set allocation functions used by the GPU host
56 * Since GPU support is not configured, there is no host memory to
58 void gpu_set_host_malloc_and_free(bool /*unused*/,
59 gmx_host_alloc_t **nb_alloc,
60 gmx_host_free_t **nb_free)
66 int gpu_info_get_stat(const gmx_gpu_info_t & /*unused*/, int /*unused*/)
68 return egpuNonexistent;
72 void free_gpu_info(const gmx_gpu_info_t *gpu_info)
74 sfree(static_cast<void*>(gpu_info->gpu_dev)); //circumvent is_pod check in sfree
77 std::vector<int> getCompatibleGpus(const gmx_gpu_info_t &gpu_info)
79 // Possible minor over-allocation here, but not important for anything
80 std::vector<int> compatibleGpus;
81 compatibleGpus.reserve(gpu_info.n_dev);
82 for (int i = 0; i < gpu_info.n_dev; i++)
84 assert(gpu_info.gpu_dev);
85 if (gpu_info_get_stat(gpu_info, i) == egpuCompatible)
87 compatibleGpus.push_back(i);
90 return compatibleGpus;
93 const char *getGpuCompatibilityDescription(const gmx_gpu_info_t &gpu_info,
96 return (index >= gpu_info.n_dev ?
97 gpu_detect_res_str[egpuNonexistent] :
98 gpu_detect_res_str[gpu_info_get_stat(gpu_info, index)]);
100 /*! \brief Help build a descriptive message in \c error if there are
101 * \c errorReasons why nonbondeds on a GPU are not supported.
103 * \returns Whether the lack of errorReasons indicate there is support. */
105 addMessageIfNotSupported(gmx::ArrayRef <const std::string> errorReasons,
108 bool isSupported = errorReasons.empty();
109 if (!isSupported && error)
111 *error = "Nonbonded interactions cannot run on GPUs: ";
112 *error += joinStrings(errorReasons, "; ") + ".";
117 bool buildSupportsNonbondedOnGpu(std::string *error)
119 std::vector<std::string> errorReasons;
122 errorReasons.emplace_back("double precision");
124 if (GMX_GPU == GMX_GPU_NONE)
126 errorReasons.emplace_back("non-GPU build of GROMACS");
128 return addMessageIfNotSupported(errorReasons, error);