src/gromacs/taskassignment/usergpuids.cpp

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   5  * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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  35 /*! \internal \file
  36  * \brief Defines routines for handling user-specified GPU IDs.
  37  *
  38  * \author Mark Abraham <mark.j.abraham@gmail.com>
  39  * \ingroup module_taskassignment
  40  */
  41 #include "gmxpre.h"
  42
  43 #include "usergpuids.h"
  44
  45 #include <cctype>
  46
  47 #include <algorithm>
  48 #include <sstream>
  49 #include <string>
  50 #include <vector>
  51
  52 #include "gromacs/gpu_utils/gpu_utils.h"
  53 #include "gromacs/hardware/hw_info.h"
  54 #include "gromacs/utility/exceptions.h"
  55 #include "gromacs/utility/stringutil.h"
  56
  57 namespace gmx
  58 {
  59
  60 std::vector<int>
  61 parseUserGpuIds(const std::string &gpuIdString)
  62 {
  63     // An optional comma is used to separate GPU IDs assigned to the
  64     // same type of task, which will be useful for any nodes that have
  65     // more than ten GPUs.
  66
  67     std::vector<int> digits;
  68     auto             foundCommaDelimiters = gpuIdString.find(',') != std::string::npos;
  69     if (!foundCommaDelimiters)
  70     {
  71         for (const auto &c : gpuIdString)
  72         {
  73             if (std::isdigit(c) == 0)
  74             {
  75                 GMX_THROW(InvalidInputError(formatString("Invalid character in GPU ID string: \"%c\"\n", c)));
  76             }
  77             // Convert each character in the token to an integer
  78             digits.push_back(c - '0');
  79         }
  80     }
  81     else
  82     {
  83         if (gpuIdString[0] == ',')
  84         {
  85             GMX_THROW(InvalidInputError("Invalid use of leading comma in GPU ID string"));
  86         }
  87         std::istringstream ss(gpuIdString);
  88         std::string        token;
  89         digits.reserve(gpuIdString.length());
  90         token.reserve(gpuIdString.length());
  91         while (std::getline(ss, token, ','))
  92         {
  93             // Convert the whole token to an integer
  94             if (token.empty())
  95             {
  96                 GMX_THROW(InvalidInputError("Invalid use of comma in GPU ID string"));
  97             }
  98             digits.push_back(std::stoi(token));
  99         }
 100     }
 101     return digits;
 102 }
 103
 104 std::vector<int>
 105 makeGpuIds(const std::vector<int> &compatibleGpus,
 106            size_t                  numGpuTasks)
 107 {
 108     std::vector<int> gpuIdsToUse;
 109
 110     gpuIdsToUse.reserve(numGpuTasks);
 111
 112     auto currentGpuId = compatibleGpus.begin();
 113     for (size_t i = 0; i != numGpuTasks; ++i)
 114     {
 115         GMX_ASSERT(!compatibleGpus.empty(), "Must have compatible GPUs from which to build a list of GPU IDs to use");
 116         gpuIdsToUse.push_back(*currentGpuId);
 117         ++currentGpuId;
 118         if (currentGpuId == compatibleGpus.end())
 119         {
 120             // Wrap around and assign tasks again.
 121             currentGpuId = compatibleGpus.begin();
 122         }
 123     }
 124     std::sort(gpuIdsToUse.begin(), gpuIdsToUse.end());
 125     return gpuIdsToUse;
 126 }
 127
 128 std::string
 129 makeGpuIdString(const std::vector<int> &gpuIds,
 130                 int                     totalNumberOfTasks)
 131 {
 132     auto resultGpuIds = makeGpuIds(gpuIds, totalNumberOfTasks);
 133     return formatAndJoin(resultGpuIds, ",", StringFormatter("%d"));
 134 }
 135
 136 void checkUserGpuIds(const gmx_gpu_info_t   &gpu_info,
 137                      const std::vector<int> &compatibleGpus,
 138                      const std::vector<int> &gpuIds)
 139 {
 140     bool        foundIncompatibleGpuIds = false;
 141     std::string message
 142         = "Some of the requested GPUs do not exist, behave strangely, or are not compatible:\n";
 143
 144     for (const auto &gpuId : gpuIds)
 145     {
 146         if (std::find(compatibleGpus.begin(), compatibleGpus.end(), gpuId) == compatibleGpus.end())
 147         {
 148             foundIncompatibleGpuIds = true;
 149             message                += gmx::formatString("    GPU #%d: %s\n",
 150                                                         gpuId,
 151                                                         getGpuCompatibilityDescription(gpu_info, gpuId));
 152         }
 153     }
 154     if (foundIncompatibleGpuIds)
 155     {
 156         GMX_THROW(InconsistentInputError(message));
 157     }
 158 }
 159
 160 } // namespace