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Piyush Kumar
Asked: 2014-01-29 02:10:45 +0800 CST

Open cl in intel

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How to compile and run open cl codes on intel i5 processors having intel hd 4000 gpu unit??? Open cl has been istalled in /opt/intel/opencl and versionis ubuntu 12.04. Any help would be of great help... Thanks

opencl

2 Answers

  1. First:
    sudo apt-get install beignet opencl-headers

    Add the beignet folder to your library search path: 

    sudo su
echo "/usr/lib/beignet/" > /etc/ld.so.conf.d/beignet.conf
ldconfig
exit

    Get a simple test binary: 

    git clone https://github.com/vpereira/CapsBasic-beignet

    Edit the makefile to look more like this: 

    all: capsbasic

capsbasic: capsbasic.cpp Makefile
    g++ capsbasic.cpp -lcl -ocapsbasic -I/usr/include -L/usr/lib/beignet

clean:
    rm -f capsbasic

    There you go. OpenCL working-ish for the intel HD family of video cards... 

    lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

    ./capsbasic

    Number of available platforms: 1
Platform names:
    [0] Experiment Intel Gen OCL Driver [Selected]
Number of devices available for each type:
    CL_DEVICE_TYPE_CPU: 0
    CL_DEVICE_TYPE_GPU: 1
    CL_DEVICE_TYPE_ACCELERATOR: 0

*** Detailed information for each device ***

CL_DEVICE_TYPE_GPU[0]
    CL_DEVICE_NAME: Intel HD Graphics Family
    CL_DEVICE_AVAILABLE: 1
    CL_DEVICE_VENDOR: Intel
    CL_DEVICE_PROFILE: FULL_PROFILE
    CL_DEVICE_VERSION: OpenCL 1.1
    CL_DRIVER_VERSION: 0.2
    CL_DEVICE_OPENCL_C_VERSION: OpenCL C 1.1
    CL_DEVICE_MAX_COMPUTE_UNITS: 128
    CL_DEVICE_MAX_CLOCK_FREQUENCY: 1000
    CL_DEVICE_MAX_WORK_GROUP_SIZE: 512
    CL_DEVICE_ADDRESS_BITS: 32
    CL_DEVICE_MEM_BASE_ADDR_ALIGN: 32
    CL_DEVICE_MAX_MEM_ALLOC_SIZE: 134217728
    CL_DEVICE_GLOBAL_MEM_SIZE: 4
    CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE: 65536
    CL_DEVICE_GLOBAL_MEM_CACHE_SIZE: 8192
    CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE: 128
    CL_DEVICE_LOCAL_MEM_SIZE: 65536
    CL_DEVICE_PROFILING_TIMER_RESOLUTION: 80
    CL_DEVICE_IMAGE_SUPPORT: 1
    CL_DEVICE_ERROR_CORRECTION_SUPPORT: 0
    CL_DEVICE_HOST_UNIFIED_MEMORY: 0
    CL_DEVICE_EXTENSIONS: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_fp64 cl_khr_icd cl_khr_gl_sharing
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT: 16
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG: 16
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT: 16
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE: 0
    CL_DEVICE_NATIVE_VECTOR_WIDTH_INT: 16
    CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG: 16
    CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT: 16
    CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE: 16
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  2. In order to compile you require a compiler such as gcc. You can download gcc from its repository. (choose the biggest version number for more C++11 feature).

    $> sudo apt-get install gcc-4.7

    After that you have to link your OpenCL library to the application you are compiling. Lets say the Host application (main.c) code and the kernel application (kernel.cl) code reside in a folder called test. You should do as following:

    $test> gcc -I /opt/intel/include -L /opt/intel/lib/[x86 or x86_64]/ main.c -o a.out

    It should take care of the compile. You should run the output as:

    $test>./a.out

    and take care of any runtime error you might get (including correcting the path to you kernel.cl etc).

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