1 | #include "NBody.hpp" |
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2 | |
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3 | extern int numBodies; // No. of particles; |
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4 | |
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5 | /////////////////////////////////// NBody::setupCL Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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6 | // |
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7 | // Initialize OpenCL specific information : |
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8 | // - get context, devices; |
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9 | // - create command-queues, memory buffers, program, kernels; |
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10 | // |
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11 | /////////////////////////////////// NBody::setupCL Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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12 | |
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13 | int NBody::setupCL() |
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14 | { |
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15 | cl_int status = CL_SUCCESS; |
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16 | |
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17 | cl_device_type dType; |
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18 | |
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19 | if(deviceType.compare("cpu") == 0) |
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20 | { |
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21 | dType = CL_DEVICE_TYPE_CPU; |
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22 | } |
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23 | else //deviceType = "gpu" |
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24 | { |
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25 | dType = CL_DEVICE_TYPE_GPU; |
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26 | } |
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27 | |
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28 | /* Create context from given device type */ |
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29 | context = clCreateContextFromType( |
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30 | 0, |
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31 | dType, |
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32 | NULL, |
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33 | NULL, |
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34 | &status); |
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35 | /* |
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36 | * if opencl fails to open a context on default device GPU |
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37 | * then it falls back to CPU |
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38 | */ |
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39 | if(status != CL_SUCCESS && dType == CL_DEVICE_TYPE_GPU) |
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40 | { |
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41 | std::cout << "Unsupported GPU device; falling back to CPU ..." << std::endl; |
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42 | std::cout << std::endl; |
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43 | context = clCreateContextFromType( |
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44 | 0, |
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45 | CL_DEVICE_TYPE_CPU, |
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46 | NULL, |
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47 | NULL, |
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48 | &status); |
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49 | } |
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50 | |
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51 | if (status != CL_SUCCESS){ |
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52 | std::cout << "clCreateContextFromType failed." << std::endl; |
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53 | return 1; |
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54 | } |
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55 | |
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56 | size_t deviceListSize; |
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57 | |
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58 | /* First, get the size of device list data */ |
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59 | status = clGetContextInfo( |
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60 | context, |
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61 | CL_CONTEXT_DEVICES, |
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62 | 0, |
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63 | NULL, |
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64 | &deviceListSize); |
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65 | |
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66 | if (status != CL_SUCCESS){ |
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67 | std::cout << "clGetContextInfo failed." << std::endl; |
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68 | return 1; |
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69 | } |
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70 | |
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71 | /* Now allocate memory for device list based on the size we got earlier */ |
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72 | devices = (cl_device_id *)malloc(deviceListSize); |
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73 | |
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74 | if(devices==NULL) { |
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75 | std::cout << "Failed to allocate memory (devices)." << std::endl; |
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76 | return 1; |
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77 | } |
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78 | |
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79 | /* Now, get the device list data */ |
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80 | status = clGetContextInfo( |
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81 | context, |
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82 | CL_CONTEXT_DEVICES, |
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83 | deviceListSize, |
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84 | devices, |
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85 | NULL); |
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86 | |
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87 | if (status != CL_SUCCESS){ |
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88 | std::cout << "clGetContextInfo failed." << std::endl; |
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89 | return 1; |
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90 | } |
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91 | |
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92 | /* Create command queue */ |
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93 | |
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94 | commandQueue = clCreateCommandQueue( |
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95 | context, |
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96 | devices[0], |
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97 | 0, |
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98 | &status); |
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99 | |
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100 | if (status != CL_SUCCESS){ |
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101 | std::cout << "clCreateCommandQueue failed." << std::endl; |
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102 | return 1; |
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103 | } |
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104 | |
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105 | //---------------------------------- |
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106 | // Device infos: |
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107 | |
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108 | getDeviceInfo(); |
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109 | |
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110 | /* |
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111 | * Create and initialize memory objects |
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112 | */ |
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113 | |
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114 | //================================================ |
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115 | // Buffers used for all Kernels: |
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116 | |
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117 | /* Create memory objects for position */ |
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118 | updatedPos = clCreateBuffer( |
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119 | context, |
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120 | CL_MEM_READ_WRITE | CL_MEM_USE_HOST_PTR, |
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121 | numBodies * sizeof(cl_float4), // numbodies * (cl_float f32[4]); |
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122 | pos, |
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123 | &status); |
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124 | |
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125 | if (status != CL_SUCCESS){ |
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126 | std::cout << "clCreateBuffer failed. (updatePos)" << std::endl; |
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127 | return 1; |
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128 | } |
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129 | |
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130 | /* Create memory objects for velocity */ |
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131 | updatedVel = clCreateBuffer( |
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132 | context, |
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133 | CL_MEM_READ_ONLY | CL_MEM_USE_HOST_PTR, |
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134 | numBodies * sizeof(cl_float4), |
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135 | vel, |
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136 | &status); |
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137 | |
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138 | if (status != CL_SUCCESS){ |
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139 | std::cout << "clCreateBuffer failed. (updatedVel)" << std::endl; |
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140 | return 1; |
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141 | } |
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142 | |
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143 | //================================================ |
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144 | // Buffers used only for Leapfrog Kernels: |
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145 | |
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146 | if (integrator == LEAPFROG){ |
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147 | |
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148 | /* Create memory objects for accelerations */ |
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149 | updatedAcc = clCreateBuffer( |
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150 | context, |
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151 | CL_MEM_READ_ONLY | CL_MEM_USE_HOST_PTR, |
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152 | numBodies * sizeof(cl_float4), |
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153 | acc, |
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154 | &status); |
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155 | |
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156 | if (status != CL_SUCCESS){ |
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157 | std::cout << "clCreateBuffer failed. (updatedAcc)" << std::endl; |
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158 | return 1; |
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159 | } |
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160 | |
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161 | /* Create memory objects for collision time */ |
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162 | updatedCollTime = clCreateBuffer( |
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163 | context, |
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164 | CL_MEM_READ_ONLY | CL_MEM_USE_HOST_PTR, |
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165 | numBodies * sizeof(cl_float), |
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166 | collTime, |
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167 | &status); |
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168 | |
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169 | if (status != CL_SUCCESS){ |
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170 | std::cout << "clCreateBuffer failed. (updatedCollTime)" << std::endl; |
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171 | return 1; |
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172 | } |
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173 | |
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174 | initialAccComputation = 1; |
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175 | } |
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176 | |
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177 | return 0; |
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178 | } |
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179 | |
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