Changeset c0d7ab3 in sasmodels


Ignore:
Timestamp:
Sep 27, 2017 4:29:00 PM (2 years ago)
Author:
Paul Kienzle <pkienzle@…>
Branches:
master, core_shell_microgels, costrafo411, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
Children:
9f8ade1
Parents:
9844c3a
Message:

split gpu setup from sasmodels installation

Location:
doc/guide
Files:
1 added
2 edited

Legend:

Unmodified
Added
Removed
  • doc/guide/index.rst

    r2e66ef5 rc0d7ab3  
    99   intro.rst 
    1010   install.rst 
     11   gpu_setup.rst 
    1112   pd/polydispersity.rst 
    1213   resolution.rst 
  • doc/guide/install.rst

    rf8a2baa rc0d7ab3  
    5353This will allow you to edit the files in the package and have the changes 
    5454show up immediately in python the next time you load your program. 
    55  
    56 OpenCL Installation 
    57 ******************* 
    58 *Warning! GPU devices do not in general offer the same level of memory 
    59 protection as CPU devices. If your code attempts to write outside allocated 
    60 memory buffers unpredicatable behaviour may result (eg, your video display 
    61 may freeze, or your system may crash, etc). Do not install OpenCL drivers 
    62 without first checking for known issues (eg, some computer manufacturers 
    63 install modified graphics drivers so replacing these may not be a good 
    64 idea!). If in doubt, seek advice from an IT professional before proceeding 
    65 further.* 
    66  
    67 Check if you have OpenCL already installed 
    68 ========================================== 
    69  
    70 **Windows** 
    71  
    72 The following instructions are based on 
    73 http://web.engr.oregonstate.edu/~mjb/cs475/DoIHaveOpenCL.pdf 
    74  
    75 * Go to: Start -> Control Panel -> System & Security -> Administrative Tools 
    76 * Double Click on Computer Managment 
    77 * Click on Device Manager 
    78 * Click open Display Adapters 
    79 * Right-click on available adapter and select Properties 
    80 * Click on Driver 
    81 * Go to Driver Details 
    82 * Scroll down and see if OpenCL is installed (look for OpenCL*.dll files) 
    83  
    84 **Mac OSX** 
    85  
    86 For OS X operating systems higher than 10.6 OpenCL is shipped along with 
    87 the system. 
    88  
    89 However, OpenCL has had a rocky history on Macs. Apple provide a useful 
    90 compatibility table at https://support.apple.com/en-us/HT202823 
    91  
    92  
    93 Installation 
    94 ============ 
    95  
    96 **Windows** 
    97  
    98 Depending on the graphic card in your system, drivers 
    99 can be obtained from different sources: 
    100  
    101 * NVIDIA: https://developer.nvidia.com/opencl 
    102 * AMD: http://developer.amd.com/tools-and-sdks/opencl-zone/ 
    103  
    104  
    105 **Mac OSX** 
    106  
    107 N/A 
    108  
    109 You cannot download OpenCL driver updates for your Mac. They are packaged 
    110 with the normal quarterly OS X updates from Apple. 
    111  
    112  
    113 .. note:: 
    114     Intel provides OpenCL drivers for Intel processors at 
    115     https://software.intel.com/en-us/articles/opencl-drivers 
    116     These can sometimes make use of special vector instructions across multiple 
    117     processors, so it is worth installing if the GPU does not support double 
    118     precision. You can install this driver alongside the GPU driver for NVIDIA 
    119     or AMD. 
    120  
    121  
    122 GPU Selection 
    123 ************* 
    124  
    125 sasmodels evaluations can run on your graphics card (GPU) or they can run 
    126 on the processor (CPU). In general, calculations performed on the GPU will run faster. 
    127  
    128 To run on the GPU, your computer must have OpenCL drivers installed. 
    129 For information about OpenCL installation see this 
    130 :ref:`opencl-installation` guidance. 
    131  
    132 Where the model is evaluated is a little bit complicated. 
    133 If the model has the line *single=False* then it requires double precision. 
    134 If the GPU is single precision only, then it will try running via OpenCL 
    135 on the CPU.  If the OpenCL driver is not available for the CPU then 
    136 it will run as a normal program on the CPU. 
    137  
    138 For models with a large number of parameters or with a lot of code, 
    139 the GPU may be too small to run the program effectively. 
    140 In this case, you should try simplifying the model, maybe breaking it 
    141 into several different modules so that you don't need *IF* statements in your code. 
    142 If it is still too big, you can set *opencl=False* in the model file and 
    143 the model will only run as a normal program on the CPU. 
    144 This will not usually be necessary. 
    145  
    146 Device Selection 
    147 ================ 
    148 If you have multiple GPU devices you can tell SasView which device to use. 
    149 By default, SasView looks for one GPU and one CPU device 
    150 from available OpenCL platforms. 
    151  
    152 SasView prefers AMD or NVIDIA drivers for GPU, and prefers Intel or 
    153 Apple drivers for CPU. Both GPU and CPU are included on the assumption that CPU 
    154 is always available and supports double precision. 
    155  
    156 The device order is important: GPU is checked before CPU on the assumption that 
    157 it will be faster. By examining ~/sasview.log you can see which device SasView 
    158 chose to run the model. 
    159  
    160 **If you don't want to use OpenCL, you can set** *SAS_OPENCL=None* 
    161 **in your environment settings, and it will only use normal programs.** 
    162  
    163 If you want to use one of the other devices, you can run the following 
    164 from the python console in SasView:: 
    165  
    166     import pyopencl as cl 
    167     cl.create_some_context() 
    168  
    169 This will provide a menu of different OpenCL drivers available. 
    170 When one is selected, it will say "set PYOPENCL_CTX=..." 
    171 Use that value as the value of *SAS_OPENCL*. 
    172  
    173 Compiler Selection 
    174 ================== 
    175 For models run as normal programs, you may need to specify a compiler. 
    176 This is done using the SAS_COMPILER environment variable. 
    177 Set it to *tinycc* for the tinycc compiler, *msvc* for the 
    178 Microsoft Visual C compiler, or *mingw* for the MinGW compiler. 
    179 TinyCC is provided with SasView so that is the default. 
    180 If you want one of the other compilers, be sure to have it available 
    181 in your *PATH* so SasView can find it! 
    182  
    183  
    184 *Document History* 
    185  
    186 | 2017-05-17 Paul Kienzle 
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