//Developing with JOCL on AMD, Intel and Nvidia OpenCL platforms

One nice feature of OpenCL is that the platform abstraction was handled in the spec from the first day on. You can install all OpenCL drivers side by side and let the application choose at runtime, on which device and on which platform it should execute the kernels.

As of today there are three four vendors which provide OpenCL implementations for the desktop. AMD and Intel support the OpenCL 1.1 specification where Nvidia apparently tries to stick with 1.0 to encourage their customers to stick with CUDA ;-). [edit] And of course there is also Apple providing out-of-the box OpenCL 1.0 support in MacOS 10.6.

JOCL contains a small CLInfo utility which can be used to quickly verify OpenCL installations. Here is the output on my system (ubuntu was booted) having all three SDKs installed:

CL_PLATFORM_NAMEATI StreamNVIDIA CUDAIntel(R) OpenCL
CL_PLATFORM_VERSIONOpenCL 1.1 ATI-Stream-v2.2 (302)OpenCL 1.0 CUDA 4.0.1OpenCL 1.1 LINUX
CL_PLATFORM_PROFILEFULL_PROFILEFULL_PROFILEFULL_PROFILE
CL_PLATFORM_VENDORAdvanced Micro Devices, Inc.NVIDIA CorporationIntel(R) Corporation
CL_PLATFORM_ICD_SUFFIX_KHRAMDNVIntel
CL_PLATFORM_EXTENSIONS[cl_khr_icd, cl_amd_event_callback][cl_khr_icd, cl_khr_byte_addressable_store, cl_nv_compiler_options, cl_nv_pragma_unroll, cl_nv_device_attribute_query, cl_khr_gl_sharing][cl_khr_icd, cl_khr_byte_addressable_store, cl_khr_fp64, cl_khr_local_int32_extended_atomics, cl_khr_local_int32_base_atomics, cl_khr_global_int32_base_atomics, cl_khr_gl_sharing, cl_intel_printf, cl_khr_global_int32_extended_atomics, cl_ext_device_fission]
CL_DEVICE_NAMEIntel(R) Core(TM) i7 CPU 940 @ 2.93GHzGeForce GTX 295GeForce GTX 295Intel(R) Core(TM) i7 CPU 940 @ 2.93GHz
CL_DEVICE_TYPECPUGPUGPUCPU
CL_DEVICE_AVAILABLEtruetruetruetrue
CL_DEVICE_VERSIONOpenCL 1.1 ATI-Stream-v2.2 (302)OpenCL 1.0 CUDAOpenCL 1.0 CUDAOpenCL 1.1
CL_DEVICE_PROFILEFULL_PROFILEFULL_PROFILEFULL_PROFILEFULL_PROFILE
CL_DEVICE_ENDIAN_LITTLEtruetruetruetrue
CL_DEVICE_VENDORGenuineIntelNVIDIA CorporationNVIDIA CorporationIntel(R) Corporation
CL_DEVICE_EXTENSIONS[cl_amd_device_attribute_query, cl_khr_byte_addressable_store, cl_khr_int64_extended_atomics, cl_khr_local_int32_extended_atomics, cl_amd_fp64, cl_amd_printf, cl_khr_local_int32_base_atomics, cl_khr_int64_base_atomics, cl_khr_global_int32_base_atomics, cl_khr_gl_sharing, cl_khr_global_int32_extended_atomics, cl_ext_device_fission][cl_khr_icd, cl_khr_byte_addressable_store, cl_khr_fp64, cl_khr_local_int32_extended_atomics, cl_khr_local_int32_base_atomics, cl_nv_compiler_options, cl_nv_pragma_unroll, cl_nv_device_attribute_query, cl_khr_global_int32_base_atomics, cl_khr_gl_sharing, cl_khr_global_int32_extended_atomics][cl_khr_icd, cl_khr_byte_addressable_store, cl_khr_fp64, cl_khr_local_int32_extended_atomics, cl_khr_local_int32_base_atomics, cl_nv_compiler_options, cl_nv_pragma_unroll, cl_nv_device_attribute_query, cl_khr_global_int32_base_atomics, cl_khr_gl_sharing, cl_khr_global_int32_extended_atomics][cl_khr_byte_addressable_store, cl_khr_fp64, cl_khr_local_int32_extended_atomics, cl_khr_local_int32_base_atomics, cl_khr_global_int32_base_atomics, cl_khr_gl_sharing, cl_intel_printf, cl_khr_global_int32_extended_atomics, cl_ext_device_fission]
CL_DEVICE_MAX_COMPUTE_UNITS830308
CL_DEVICE_MAX_CLOCK_FREQUENCY2934124212422930
CL_DEVICE_VENDOR_ID40984318431832902
CL_DEVICE_OPENCL_C_VERSIONOpenCL C 1.1 com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info string [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info string [error: CL_INVALID_VALUE]OpenCL C 1.1
CL_DRIVER_VERSION2.0270.41.06270.41.061.1
CL_DEVICE_ADDRESS_BITS64323264
CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT8118
CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR161116
CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT4114
CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG2112
CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT4114
CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE0112
CL_DEVICE_NATIVE_VECTOR_WIDTH_CHAR16com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]16
CL_DEVICE_NATIVE_VECTOR_WIDTH_SHORT8com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]8
CL_DEVICE_NATIVE_VECTOR_WIDTH_INT4com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]4
CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG2com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]2
CL_DEVICE_NATIVE_VECTOR_WIDTH_HALF0com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]0
CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT4com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]4
CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE0com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]2
CL_DEVICE_MAX_WORK_GROUP_SIZE10245125121024
CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS3333
CL_DEVICE_MAX_WORK_ITEM_SIZES[1024, 1024, 1024][512, 512, 64][512, 512, 64][1024, 1024, 1024]
CL_DEVICE_MAX_PARAMETER_SIZE4096435243521024
CL_DEVICE_MAX_MEM_ALLOC_SIZE10737418242348318722347008003154703360
CL_DEVICE_GLOBAL_MEM_SIZE322122547293932748893880320012618813440
CL_DEVICE_LOCAL_MEM_SIZE32768163841638432768
CL_DEVICE_HOST_UNIFIED_MEMORYtruecom.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]com.jogamp.opencl.CLException$CLInvalidValueException: error while asking for info value [error: CL_INVALID_VALUE]true
CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE655366553665536131072
CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE640064
CL_DEVICE_GLOBAL_MEM_CACHE_SIZE3276800262144
CL_DEVICE_MAX_CONSTANT_ARGS899128
CL_DEVICE_IMAGE_SUPPORTfalsetruetruetrue
CL_DEVICE_MAX_READ_IMAGE_ARGS0128128128
CL_DEVICE_MAX_WRITE_IMAGE_ARGS088128
CL_DEVICE_IMAGE2D_MAX_WIDTH0409640968192
CL_DEVICE_IMAGE2D_MAX_HEIGHT032768327688192
CL_DEVICE_IMAGE3D_MAX_WIDTH0204820482048
CL_DEVICE_IMAGE3D_MAX_HEIGHT0204820482048
CL_DEVICE_IMAGE3D_MAX_DEPTH0204820482048
CL_DEVICE_MAX_SAMPLERS01616128
CL_DEVICE_PROFILING_TIMER_RESOLUTION110001000340831
CL_DEVICE_EXECUTION_CAPABILITIES[EXEC_KERNEL, EXEC_NATIVE_KERNEL][EXEC_KERNEL][EXEC_KERNEL][EXEC_KERNEL, EXEC_NATIVE_KERNEL]
CL_DEVICE_HALF_FP_CONFIG[][][][]
CL_DEVICE_SINGLE_FP_CONFIG[DENORM, INF_NAN, ROUND_TO_NEAREST, ROUND_TO_INF, ROUND_TO_ZERO][INF_NAN, ROUND_TO_NEAREST, ROUND_TO_INF, ROUND_TO_ZERO, FMA][INF_NAN, ROUND_TO_NEAREST, ROUND_TO_INF, ROUND_TO_ZERO, FMA][DENORM, INF_NAN, ROUND_TO_NEAREST]
CL_DEVICE_DOUBLE_FP_CONFIG[][DENORM, INF_NAN, ROUND_TO_NEAREST, ROUND_TO_INF, ROUND_TO_ZERO, FMA][DENORM, INF_NAN, ROUND_TO_NEAREST, ROUND_TO_INF, ROUND_TO_ZERO, FMA][DENORM, INF_NAN, ROUND_TO_NEAREST, ROUND_TO_INF, ROUND_TO_ZERO, FMA]
CL_DEVICE_LOCAL_MEM_TYPEGLOBALLOCALLOCALGLOBAL
CL_DEVICE_GLOBAL_MEM_CACHE_TYPEREAD_WRITENONENONEREAD_WRITE
CL_DEVICE_QUEUE_PROPERTIES[PROFILING_MODE][OUT_OF_ORDER_MODE, PROFILING_MODE][OUT_OF_ORDER_MODE, PROFILING_MODE][OUT_OF_ORDER_MODE, PROFILING_MODE]
CL_DEVICE_COMPILER_AVAILABLEtruetruetruetrue
CL_DEVICE_ERROR_CORRECTION_SUPPORTfalsefalsefalsefalse
cl_khr_fp16falsefalsefalsefalse
cl_khr_fp64falsetruetruetrue
cl_khr_gl_sharing | cl_APPLE_gl_sharingtruetruetruetrue

The CLInfo utility is part of the jocl-demos project and is also available via webstart. For a plain text version of the above output you can run:

 java -jar jocl.jar:gluegen-rt.jar\
    -Djava.library.path="path/to/jocl/libs:path/to/gluegen/libs" com.jogamp.opencl.util.CLInfo

(btw to install the intel sdk on debian based systems follow this link)

happy coding!


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