1 | r""" |
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2 | DLL driver for C kernels |
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3 | |
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4 | The global attribute *ALLOW_SINGLE_PRECISION_DLLS* should be set to *True* if |
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5 | you wish to allow single precision floating point evaluation for the compiled |
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6 | models, otherwise it defaults to *False*. |
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7 | |
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8 | The compiler command line is stored in the attribute *COMPILE*, with string |
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9 | substitutions for %(source)s and %(output)s indicating what to compile and |
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10 | where to store it. The actual command is system dependent. |
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11 | |
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12 | On windows systems, you have a choice of compilers. *MinGW* is the GNU |
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13 | compiler toolchain, available in packages such as anaconda and PythonXY, |
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14 | or available stand alone. This toolchain has had difficulties on some |
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15 | systems, and may or may not work for you. In order to build DLLs, *gcc* |
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16 | must be on your path. If the environment variable *SAS_OPENMP* is given |
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17 | then -fopenmp is added to the compiler flags. This requires a version |
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18 | of MinGW compiled with OpenMP support. |
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19 | |
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20 | An alternative toolchain uses the Microsoft Visual C++ compiler, available |
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21 | free from microsoft: |
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22 | |
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23 | `<http://www.microsoft.com/en-us/download/details.aspx?id=44266>`_ |
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24 | |
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25 | Again, this requires that the compiler is available on your path. This is |
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26 | done by running vcvarsall.bat in a windows terminal. Install locations are |
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27 | system dependent, such as: |
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28 | |
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29 | C:\Program Files (x86)\Common Files\Microsoft\Visual C++ for Python\9.0\vcvarsall.bat |
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30 | |
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31 | or maybe |
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32 | |
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33 | C:\Users\yourname\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0\vcvarsall.bat |
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34 | |
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35 | And again, the environment variable *SAS_OPENMP* controls whether OpenMP is |
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36 | used to compile the C code. This requires the Microsoft vcomp90.dll library, |
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37 | which doesn't seem to be included with the compiler, nor does there appear |
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38 | to be a public download location. There may be one on your machine already |
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39 | in a location such as: |
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40 | |
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41 | C:\Windows\winsxs\x86_microsoft.vc90.openmp*\vcomp90.dll |
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42 | |
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43 | If you copy this onto your path, such as the python directory or the install |
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44 | directory for this application, then OpenMP should be supported. |
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45 | """ |
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46 | from __future__ import print_function |
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47 | |
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48 | import sys |
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49 | import os |
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50 | import tempfile |
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51 | import ctypes as ct |
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52 | from ctypes import c_void_p, c_int32, c_longdouble, c_double, c_float |
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53 | |
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54 | import numpy as np |
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55 | |
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56 | from . import generate |
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57 | from .kernelpy import PyInput, PyModel |
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58 | from .exception import annotate_exception |
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59 | |
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60 | # Compiler platform details |
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61 | if sys.platform == 'darwin': |
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62 | #COMPILE = "gcc-mp-4.7 -shared -fPIC -std=c99 -fopenmp -O2 -Wall %s -o %s -lm -lgomp" |
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63 | COMPILE = "gcc -shared -fPIC -std=c99 -O2 -Wall %(source)s -o %(output)s -lm" |
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64 | elif os.name == 'nt': |
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65 | # call vcvarsall.bat before compiling to set path, headers, libs, etc. |
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66 | if "VCINSTALLDIR" in os.environ: |
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67 | # MSVC compiler is available, so use it. OpenMP requires a copy of |
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68 | # vcomp90.dll on the path. One may be found here: |
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69 | # C:/Windows/winsxs/x86_microsoft.vc90.openmp*/vcomp90.dll |
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70 | # Copy this to the python directory and uncomment the OpenMP COMPILE |
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71 | # TODO: remove intermediate OBJ file created in the directory |
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72 | # TODO: maybe don't use randomized name for the c file |
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73 | CC = "cl /nologo /Ox /MD /W3 /GS- /DNDEBUG /Tp%(source)s " |
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74 | LN = "/link /DLL /INCREMENTAL:NO /MANIFEST /OUT:%(output)s" |
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75 | if "SAS_OPENMP" in os.environ: |
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76 | COMPILE = " ".join((CC, "/openmp", LN)) |
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77 | else: |
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78 | COMPILE = " ".join((CC, LN)) |
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79 | else: |
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80 | COMPILE = "gcc -shared -fPIC -std=c99 -O2 -Wall %(source)s -o %(output)s -lm" |
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81 | if "SAS_OPENMP" in os.environ: |
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82 | COMPILE += " -fopenmp" |
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83 | else: |
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84 | COMPILE = "cc -shared -fPIC -fopenmp -std=c99 -O2 -Wall %(source)s -o %(output)s -lm" |
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85 | |
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86 | DLL_PATH = tempfile.gettempdir() |
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87 | |
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88 | ALLOW_SINGLE_PRECISION_DLLS = True |
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89 | |
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90 | |
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91 | def dll_name(model_info, dtype): |
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92 | """ |
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93 | Name of the dll containing the model. This is the base file name without |
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94 | any path or extension, with a form such as 'sas_sphere32'. |
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95 | """ |
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96 | bits = 8*dtype.itemsize |
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97 | return "sas_%s%d"%(model_info['id'], bits) |
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98 | |
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99 | def dll_path(model_info, dtype): |
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100 | """ |
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101 | Complete path to the dll for the model. Note that the dll may not |
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102 | exist yet if it hasn't been compiled. |
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103 | """ |
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104 | return os.path.join(DLL_PATH, dll_name(model_info, dtype)+".so") |
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105 | |
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106 | def make_dll(source, model_info, dtype="double"): |
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107 | """ |
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108 | Load the compiled model defined by *kernel_module*. |
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109 | |
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110 | Recompile if any files are newer than the model file. |
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111 | |
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112 | *dtype* is a numpy floating point precision specifier indicating whether |
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113 | the model should be single or double precision. The default is double |
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114 | precision. |
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115 | |
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116 | The DLL is not loaded until the kernel is called so models can |
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117 | be defined without using too many resources. |
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118 | |
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119 | Set *sasmodels.kerneldll.DLL_PATH* to the compiled dll output path. |
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120 | The default is the system temporary directory. |
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121 | |
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122 | Set *sasmodels.ALLOW_SINGLE_PRECISION_DLLS* to True if single precision |
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123 | models are allowed as DLLs. |
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124 | """ |
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125 | if callable(model_info.get('Iq', None)): |
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126 | return PyModel(model_info) |
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127 | |
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128 | dtype = np.dtype(dtype) |
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129 | if dtype == generate.F16: |
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130 | raise ValueError("16 bit floats not supported") |
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131 | if dtype == generate.F32 and not ALLOW_SINGLE_PRECISION_DLLS: |
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132 | dtype = generate.F64 # Force 64-bit dll |
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133 | |
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134 | source = generate.convert_type(source, dtype) |
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135 | newest = generate.timestamp(model_info) |
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136 | dll = dll_path(model_info, dtype) |
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137 | if not os.path.exists(dll) or os.path.getmtime(dll) < newest: |
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138 | basename = dll_name(model_info, dtype) + "_" |
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139 | fid, filename = tempfile.mkstemp(suffix=".c", prefix=basename) |
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140 | os.fdopen(fid, "w").write(source) |
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141 | command = COMPILE%{"source":filename, "output":dll} |
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142 | print("Compile command: "+command) |
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143 | status = os.system(command) |
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144 | if status != 0 or not os.path.exists(dll): |
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145 | raise RuntimeError("compile failed. File is in %r"%filename) |
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146 | else: |
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147 | ## comment the following to keep the generated c file |
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148 | os.unlink(filename) |
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149 | #print("saving compiled file in %r"%filename) |
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150 | return dll |
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151 | |
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152 | |
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153 | def load_dll(source, model_info, dtype="double"): |
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154 | """ |
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155 | Create and load a dll corresponding to the source, info pair returned |
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156 | from :func:`sasmodels.generate.make` compiled for the target precision. |
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157 | |
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158 | See :func:`make_dll` for details on controlling the dll path and the |
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159 | allowed floating point precision. |
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160 | """ |
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161 | filename = make_dll(source, model_info, dtype=dtype) |
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162 | return DllModel(filename, model_info, dtype=dtype) |
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163 | |
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164 | class DllModel(object): |
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165 | """ |
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166 | ctypes wrapper for a single model. |
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167 | |
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168 | *source* and *model_info* are the model source and interface as returned |
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169 | from :func:`gen.make`. |
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170 | |
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171 | *dtype* is the desired model precision. Any numpy dtype for single |
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172 | or double precision floats will do, such as 'f', 'float32' or 'single' |
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173 | for single and 'd', 'float64' or 'double' for double. Double precision |
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174 | is an optional extension which may not be available on all devices. |
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175 | |
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176 | Call :meth:`release` when done with the kernel. |
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177 | """ |
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178 | |
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179 | def __init__(self, dllpath, model_info, dtype=generate.F32): |
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180 | self.info = model_info |
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181 | self.dllpath = dllpath |
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182 | self.dll = None |
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183 | self.dtype = np.dtype(dtype) |
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184 | |
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185 | def _load_dll(self): |
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186 | #print("dll", self.dllpath) |
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187 | try: |
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188 | self.dll = ct.CDLL(self.dllpath) |
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189 | except Exception as exc: |
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190 | annotate_exception(exc, "while loading "+self.dllpath) |
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191 | raise |
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192 | |
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193 | fp = (c_float if self.dtype == generate.F32 |
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194 | else c_double if self.dtype == generate.F64 |
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195 | else c_longdouble) |
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196 | |
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197 | # int, int, int, int*, double*, double*, double*, double*, double*, double |
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198 | argtypes = [c_int32]*3 + [c_void_p]*5 + [fp] |
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199 | self.Iq = self.dll[generate.kernel_name(self.info, False)] |
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200 | self.Iqxy = self.dll[generate.kernel_name(self.info, True)] |
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201 | self.Iq.argtypes = argtypes |
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202 | self.Iqxy.argtypes = argtypes |
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203 | |
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204 | def __getstate__(self): |
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205 | return self.info, self.dllpath |
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206 | |
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207 | def __setstate__(self, state): |
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208 | self.info, self.dllpath = state |
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209 | self.dll = None |
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210 | |
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211 | def make_kernel(self, q_vectors): |
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212 | q_input = PyInput(q_vectors, self.dtype) |
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213 | if self.dll is None: self._load_dll() |
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214 | kernel = self.Iqxy if q_input.is_2d else self.Iq |
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215 | return DllKernel(kernel, self.info, q_input) |
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216 | |
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217 | def release(self): |
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218 | """ |
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219 | Release any resources associated with the model. |
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220 | """ |
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221 | if os.name == 'nt': |
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222 | #dll = ct.cdll.LoadLibrary(self.dllpath) |
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223 | dll = ct.CDLL(self.dllpath) |
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224 | libHandle = dll._handle |
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225 | #libHandle = ct.c_void_p(dll._handle) |
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226 | del dll, self.dll |
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227 | self.dll = None |
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228 | #_ctypes.FreeLibrary(libHandle) |
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229 | ct.windll.kernel32.FreeLibrary(libHandle) |
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230 | else: |
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231 | pass |
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232 | |
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233 | |
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234 | class DllKernel(object): |
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235 | """ |
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236 | Callable SAS kernel. |
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237 | |
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238 | *kernel* is the c function to call. |
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239 | |
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240 | *model_info* is the module information |
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241 | |
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242 | *q_input* is the DllInput q vectors at which the kernel should be |
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243 | evaluated. |
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244 | |
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245 | The resulting call method takes the *pars*, a list of values for |
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246 | the fixed parameters to the kernel, and *pd_pars*, a list of (value, weight) |
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247 | vectors for the polydisperse parameters. *cutoff* determines the |
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248 | integration limits: any points with combined weight less than *cutoff* |
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249 | will not be calculated. |
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250 | |
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251 | Call :meth:`release` when done with the kernel instance. |
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252 | """ |
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253 | def __init__(self, kernel, model_info, q_input): |
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254 | self.kernel = kernel |
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255 | self.info = model_info |
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256 | self.q_input = q_input |
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257 | self.dtype = q_input.dtype |
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258 | self.dim = '2d' if q_input.is_2d else '1d' |
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259 | self.result = np.empty(q_input.nq+3, q_input.dtype) |
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260 | |
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261 | def __call__(self, details, weights, values, cutoff): |
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262 | real = (np.float32 if self.q_input.dtype == generate.F32 |
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263 | else np.float64 if self.q_input.dtype == generate.F64 |
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264 | else np.float128) |
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265 | assert isinstance(details, generate.CoordinationDetails) |
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266 | assert weights.dtype == real and values.dtype == real |
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267 | |
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268 | start, stop = 0, details.total_pd |
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269 | #print("in kerneldll") |
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270 | #print("weights", weights) |
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271 | #print("values", values) |
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272 | args = [ |
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273 | self.q_input.nq, # nq |
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274 | start, # pd_start |
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275 | stop, # pd_stop pd_stride[MAX_PD] |
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276 | details.ctypes.data, # problem |
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277 | weights.ctypes.data, # weights |
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278 | values.ctypes.data, #pars |
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279 | self.q_input.q.ctypes.data, #q |
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280 | self.result.ctypes.data, # results |
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281 | real(cutoff), # cutoff |
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282 | ] |
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283 | self.kernel(*args) |
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284 | return self.result[:-3] |
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285 | |
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286 | def release(self): |
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287 | """ |
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288 | Release any resources associated with the kernel. |
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289 | """ |
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290 | pass |
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