clGetDeviceInfo
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clGetDeviceInfo
Get information about an OpenCL device.
cl_int clGetDeviceInfo(
cl_device_id device, cl_device_info param_name, size_t param_value_size, void *param_value, size_t *param_value_size_ret)
Parameters
- device
Refers to the device returned by clGetDeviceIDs.
- param_name
An enumeration constant that identifies the device information being queried. It can be one of the values as specified in the table below.
- param_value
A pointer to memory location where appropriate values for a given
param_name
as specified in the table below will be returned. Ifparam_value
is NULL, it is ignored.- param_value_size
Specifies the size in bytes of memory pointed to by
param_value
. This size in bytes must be greater than or equal to size of return type specified in the table below.- param_value_size_ret
Returns the actual size in bytes of data being queried by
param_value
. Ifparam_value_size_ret
is NULL, it is ignoredcl_device_info Description CL_DEVICE_ADDRESS_BITS
Return type: cl_uint
The default compute device address space size specified as an unsigned integer value in bits. Currently supported values are 32 or 64 bits.
CL_DEVICE_AVAILABLE
Return type: cl_bool
Is CL_TRUE if the device is available and CL_FALSE if the device is not available.
CL_DEVICE_COMPILER_AVAILABLE
Return type: cl_bool
Is CL_FALSE if the implementation does not have a compiler available to compile the program source. Is CL_TRUE if the compiler is available. This can be CL_FALSE for the embededed platform profile only.
CL_DEVICE_DOUBLE_FP_CONFIG
Return type: cl_device_fp_config
Describes the OPTIONAL double precision floating-point capability of the OpenCL device. This is a bit-field that describes one or more of the following values:
- CL_FP_DENORM - denorms are supported.
- CL_FP_INF_NAN - INF and NaNs are supported.
- CL_FP_ROUND_TO_NEAREST - round to nearest even rounding mode supported.
- CL_FP_ROUND_TO_ZERO - round to zero rounding mode supported.
- CL_FP_ROUND_TO_INF - round to +ve and -ve infinity rounding modes supported.
- CP_FP_FMA - IEEE754-2008 fused multiply-add is supported.
The mandated minimum double precision floating-point capability is CL_FP_FMA | CL_FP_ROUND_TO_NEAREST | CL_FP_ROUND_TO_ZERO | CL_FP_ROUND_TO_INF | CL_FP_INF_NAN | CL_FP_DENORM.
CL_DEVICE_ENDIAN_LITTLE
Return type: cl_bool
Is CL_TRUE if the OpenCL device is a little endian device and CL_FALSE otherwise.
CL_DEVICE_ERROR_CORRECTION_SUPPORT
Return type: cl_bool
Is CL_TRUE if the device implements error correction for the memories, caches, registers etc. in the device. Is CL_FALSE if the device does not implement error correction. This can be a requirement for certain clients of OpenCL.
CL_DEVICE_EXECUTION_CAPABILITIES
Return type: cl_device_exec_capabilities
Describes the execution capabilities of the device. This is a bit-field that describes one or more of the following values:
CL_EXEC_KERNEL - The OpenCL device can execute OpenCL kernels.
CL_EXEC_NATIVE_KERNEL - The OpenCL device can execute native kernels.
The mandated minimum capability is CL_EXEC_KERNEL.
CL_DEVICE_EXTENSIONS
Return type: char[]
Returns a space separated list of extension names (the extension names themselves do not contain any spaces). The list of extension names returned currently can include one or more of the following approved extension names:
cl_khr_fp64
cl_khr_select_fprounding_mode
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_int64_base_atomics
cl_khr_int64_extended_atomics
cl_khr_3d_image_writes
cl_khr_byte_addressable_store
cl_khr_fp16CL_DEVICE_GLOBAL_MEM_CACHE_SIZE
Return type: cl_ulong
Size of global memory cache in bytes.
CL_DEVICE_GLOBAL_MEM_CACHE_TYPE
Return type: cl_device_mem_cache_type
Type of global memory cache supported. Valid values are: CL_NONE, CL_READ_ONLY_CACHE, and CL_READ_WRITE_CACHE.
CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE
Return type: cl_uint
Size of global memory cache line in bytes.
CL_DEVICE_GLOBAL_MEM_SIZE
Return type: cl_ulong
Size of global device memory in bytes.
CL_DEVICE_HALF_FP_CONFIG
Return type: cl_device_fp_config
Describes the OPTIONAL half precision floating-point capability of the OpenCL device. This is a bit-field that describes one or more of the following values:
- CL_FP_DENORM - denorms are supported.
- CL_FP_INF_NAN - INF and NaNs are supported.
- CL_FP_ROUND_TO_NEAREST - round to nearest even rounding mode supported.
- CL_FP_ROUND_TO_ZERO - round to zero rounding mode supported.
- CL_FP_ROUND_TO_INF - round to +ve and -ve infinity rounding modes supported.
- CP_FP_FMA - IEEE754-2008 fused multiply-add is supported.
The required minimum half precision floating-point capability as implemented by this extension is CL_FP_ROUND_TO_ZERO | CL_FP_ROUND_TO_INF | CL_FP_INF_NAN.
CL_DEVICE_IMAGE_SUPPORT
Return type: cl_bool
Is CL_TRUE if images are supported by the OpenCL device and CL_FALSE otherwise.
CL_DEVICE_IMAGE2D_MAX_HEIGHT
Return type: size_t
Max height of 2D image in pixels. The minimum value is 8192 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_IMAGE2D_MAX_WIDTH
Return type: size_t
Max width of 2D image in pixels. The minimum value is 8192 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_IMAGE3D_MAX_DEPTH
Return type: size_t
Max depth of 3D image in pixels. The minimum value is 2048 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_IMAGE3D_MAX_HEIGHT
Return type: size_t
Max height of 3D image in pixels. The minimum value is 2048 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_IMAGE3D_MAX_WIDTH
Return type: size_t
Max width of 3D image in pixels. The minimum value is 2048 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_LOCAL_MEM_SIZE
Return type: cl_ulong
Size of local memory arena in bytes. The minimum value is 16 KB.
CL_DEVICE_LOCAL_MEM_TYPE
Return type: cl_device_local_mem_type
Type of local memory supported. This can be set to CL_LOCAL implying dedicated local memory storage such as SRAM, or CL_GLOBAL.
CL_DEVICE_MAX_CLOCK_FREQUENCY
Return type: cl_uint
Maximum configured clock frequency of the device in MHz.
CL_DEVICE_MAX_COMPUTE_UNITS
Return type: cl_uint
The number of parallel compute cores on the OpenCL device. The minimum value is 1.
CL_DEVICE_MAX_CONSTANT_ARGS
Return type: cl_uint
Max number of arguments declared with the __constant qualifier in a kernel. The minimum value is 8.
CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE
Return type: cl_ulong
Max size in bytes of a constant buffer allocation. The minimum value is 64 KB.
CL_DEVICE_MAX_MEM_ALLOC_SIZE
Return type: cl_ulong
Max size of memory object allocation in bytes. The minimum value is max (1/4th of CL_DEVICE_GLOBAL_MEM_SIZE, 128*1024*1024)
CL_DEVICE_MAX_PARAMETER_SIZE
Return type: size_t
Max size in bytes of the arguments that can be passed to a kernel. The minimum value is 256.
CL_DEVICE_MAX_READ_IMAGE_ARGS
Return type: cl_uint
Max number of simultaneous image objects that can be read by a kernel. The minimum value is 128 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_MAX_SAMPLERS
Return type: cl_uint
Maximum number of samplers that can be used in a kernel. The minimum value is 16 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE. (Also see sampler_t.)
CL_DEVICE_MAX_WORK_GROUP_SIZE
Return type: size_t
Maximum number of work-items in a work-group executing a kernel using the data parallel execution model. (Refer to clEnqueueNDRangeKernel). The minimum value is 1.
CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS
Return type: cl_uint
Maximum dimensions that specify the global and local work-item IDs used by the data parallel execution model. (Refer to clEnqueueNDRangeKernel). The minimum value is 3.
CL_DEVICE_MAX_WORK_ITEM_SIZES
Return type: size_t[]
Maximum number of work-items that can be specified in each dimension of the work-group to clEnqueueNDRangeKernel.
Returns
n
size_t entries, wheren
is the value returned by the query for CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS. The minimum value is (1, 1, 1).CL_DEVICE_MAX_WRITE_IMAGE_ARGS
Return type: cl_uint
Max number of simultaneous image objects that can be written to by a kernel. The minimum value is 8 if CL_DEVICE_IMAGE_SUPPORT is CL_TRUE.
CL_DEVICE_MEM_BASE_ADDR_ALIGN
Return type: cl_uint
Describes the alignment in bits of the base address of any allocated memory object.
CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE
Return type: cl_uint
The smallest alignment in bytes which can be used for any data type.
CL_DEVICE_NAME
Return type: char[]
Device name string.
CL_DEVICE_PLATFORM
Return type: cl_platform_id
The platform associated with this device.
CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR
CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT
CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT
CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG
CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT
CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE
Return type: cl_uint
Preferred native vector width size for built-in scalar types that can be put into vectors. The vector width is defined as the number of scalar elements that can be stored in the vector.
If the cl_khr_fp64 extension is not supported, CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE must return 0.
CL_DEVICE_PROFILE
Return type: char[]
OpenCL profile string. Returns the profile name supported by the device (see note). The profile name returned can be one of the following strings:
FULL_PROFILE - if the device supports the OpenCL specification (functionality defined as part of the core specification and does not require any extensions to be supported).
EMBEDDED_PROFILE - if the device supports the OpenCL embedded profile.
CL_DEVICE_PROFILING_TIMER_RESOLUTION
Return type: size_t
Describes the resolution of device timer. This is measured in nanoseconds.
CL_DEVICE_QUEUE_PROPERTIES
Return type: cl_command_queue_properties
Describes the command-queue properties supported by the device. This is a bit-field that describes one or more of the following values:
CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE
CL_QUEUE_PROFILING_ENABLE
These properties are described in the table for clCreateCommandQueue. The mandated minimum capability is CL_QUEUE_PROFILING_ENABLE.
CL_DEVICE_SINGLE_FP_CONFIG
Return type: cl_device_fp_config
Describes single precision floating-point capability of the device. This is a bit-field that describes one or more of the following values:
CL_FP_DENORM - denorms are supported
CL_FP_INF_NAN - INF and quiet NaNs are supported
CL_FP_ROUND_TO_NEAREST - round to nearest even rounding mode supported
CL_FP_ROUND_TO_ZERO - round to zero rounding mode supported
CL_FP_ROUND_TO_INF - round to +ve and -ve infinity rounding modes supported
CL_FP_FMA - IEEE754-2008 fused multiply-add is supported
The mandated minimum floating-point capability is CL_FP_ROUND_TO_NEAREST | CL_FP_INF_NAN.
CL_DEVICE_TYPE
Return type: cl_device_type
The OpenCL device type. Currently supported values are one of or a combination of: CL_DEVICE_TYPE_CPU, CL_DEVICE_TYPE_GPU, CL_DEVICE_TYPE_ACCELERATOR, or CL_DEVICE_TYPE_DEFAULT.
CL_DEVICE_VENDOR
Return type: char[]
Vendor name string.
CL_DEVICE_VENDOR_ID
Return type: cl_uint
A unique device vendor identifier. An example of a unique device identifier could be the PCIe ID.
CL_DEVICE_VERSION
Return type: char[]
OpenCL version string. Returns the OpenCL version supported by the device. This version string has the following format:
OpenCL<space><major_version.minor_version><space><vendor-specific information>
The
major_version.minor_version
value returned will be 1.0.CL_DRIVER_VERSION
Return type: char[]
OpenCL software driver version string in the form
major_number.minor_number
.
Notes
CL_DEVICE_PROFILE: The platform profile returns the profile that is implemented by the OpenCL framework. If the platform profile returned is FULL_PROFILE, the OpenCL framework will support devices that are FULL_PROFILE and may also support devices that are EMBEDDED_PROFILE. The compiler must be available for all devices i.e. CL_DEVICE_COMPILER_AVAILABLE is CL_TRUE. If the platform profile returned is EMBEDDED_PROFILE, then devices that are only EMBEDDED_PROFILE are supported.
Errors
clGetDeviceInfo
returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns the following:
- CL_INVALID_DEVICE if
device
is not valid. - CL_INVALID_VALUE if
param_name
is not one of the supported values or if size in bytes specified byparam_value_size
is less than size of return type as shown in the table above andparam_value
is not a NULL value.
Specification
OpenCL Specification
Also see
clGetDeviceIDs, cl_khr_fp64, __constant, clCreateCommandQueue, clRetainCommandQueue, clEnqueueNDRangeKernel
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