src/gromacs/gpu_utils/gpu_utils.cpp

   1 /*
   2  * This file is part of the GROMACS molecular simulation package.
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   4  * Copyright (c) 2014,2015,2017,2018, by the GROMACS development team, led by
   5  * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
   6  * and including many others, as listed in the AUTHORS file in the
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  35 /*! \internal \file
  36  *  \brief Function definitions for non-GPU builds
  37  *
  38  *  \author Mark Abraham <mark.j.abraham@gmail.com>
  39  */
  40 #include "gmxpre.h"
  41
  42 #include "gpu_utils.h"
  43
  44 #include "config.h"
  45
  46 #include <cassert>
  47
  48 #include "gromacs/hardware/gpu_hw_info.h"
  49 #include "gromacs/utility/smalloc.h"
  50
  51 #if !GMX_GPU
  52 /*! \brief Set allocation functions used by the GPU host
  53  *
  54  * Since GPU support is not configured, there is no host memory to
  55  * allocate. */
  56 void gpu_set_host_malloc_and_free(bool /*unused*/,
  57                                   gmx_host_alloc_t **nb_alloc,
  58                                   gmx_host_free_t  **nb_free)
  59 {
  60     *nb_alloc = nullptr;
  61     *nb_free  = nullptr;
  62 }
  63
  64 int gpu_info_get_stat(const gmx_gpu_info_t & /*unused*/, int /*unused*/)
  65 {
  66     return egpuNonexistent;
  67 }
  68 #endif
  69
  70 void free_gpu_info(const gmx_gpu_info_t *gpu_info)
  71 {
  72     sfree(static_cast<void*>(gpu_info->gpu_dev)); //circumvent is_pod check in sfree
  73 }
  74
  75 std::vector<int> getCompatibleGpus(const gmx_gpu_info_t &gpu_info)
  76 {
  77     // Possible minor over-allocation here, but not important for anything
  78     std::vector<int> compatibleGpus;
  79     compatibleGpus.reserve(gpu_info.n_dev);
  80     for (int i = 0; i < gpu_info.n_dev; i++)
  81     {
  82         assert(gpu_info.gpu_dev);
  83         if (gpu_info_get_stat(gpu_info, i) == egpuCompatible)
  84         {
  85             compatibleGpus.push_back(i);
  86         }
  87     }
  88     return compatibleGpus;
  89 }
  90
  91 const char *getGpuCompatibilityDescription(const gmx_gpu_info_t &gpu_info,
  92                                            int                   index)
  93 {
  94     return (index >= gpu_info.n_dev ?
  95             gpu_detect_res_str[egpuNonexistent] :
  96             gpu_detect_res_str[gpu_info_get_stat(gpu_info, index)]);
  97 }