Provided by: clinfo_2.2.18.03.26-1_amd64 bug

NAME

       clinfo - show OpenCL platforms and devices

SYNOPSIS

       clinfo [options ...]

DESCRIPTION

       clinfo prints all available information about all OpenCL platforms available on the system
       and the devices they expose.

OPTIONS

       clinfo accepts the following options:

       -a, --all-props
         try to retrieve all properties, even those not officially supported (e.g.  because  they
         require  specific  extensions),  but  only  show them if the property could be retrieved
         successfully; see also the LIMITATIONS section below; note that  even  though  this  may
         reveal hidden properties, there is no guarantee that the returned values are meaningful,
         nor that the corresponding feature is actually available at all;

       -A, --always-all-props
         like -a, but also show errors;

       --human
         produce human-friendly output; this is the default (except as noted below);

       --raw
         produce machine-friendly output; this is the default if clinfo is invoked  with  a  name
         that contains the string “raw”;

       --offline
         shows also offline devices for platforms that expose this feature;

       -l, --list
         list platforms and devices by name, with no (other) properties;

       -h, -?
         show usage;

       --version, -v
         show program version.

CONFORMING TO

       OpenCL 1.1, OpenCL 1.2, OpenCL 2.0, OpenCL 2.1, OpenCL 2.2.

EXTENSIONS

       Supported OpenCL extensions:

       cl_khr_fp16, cl_khr_fp64, cl_amd_fp64, cl_APPLE_fp64_basic_ops
         for  information  about  support  for half-precision and double-precision floating-point
         data types;

       cl_khr_image2d_from_buffer
         for information about the base address and pitch alignment requirements of buffers to be
         used as base for 2D images;

       cl_khr_il_program
         for information about the supported IL (Intermediate Language) representations;

       cl_khr_spir
         for information about the supported SPIR (Standard Portable Intermediate Representation)
         versions;

       cl_khr_icd
         for the suffix of vendor extensions functions;

       cl_khr_subgroup_named_barrier
         for the maximum number of named sub-group barriers;

       cl_khr_terminate_context
         for the terminate capabilities for the device;

       cl_ext_device_fission
         for device fission support in OpenCL 1.1 devices;

       cl_ext_atomic_counters_32
       cl_ext_atomic_counters_64
         for the atomic counter extension;

       cl_amd_device_attribute_query
         for AMD-specific device attributes;

       cl_amd_object_metadata
         to show the maximum number of keys supported by the platform;

       cl_amd_offline_devices
         to show offline devices exposed by the platform, if requested (see --offline option);

       cl_amd_copy_buffer_p2p
         to show the number and IDs of available P2P devices;

       cl_amd_svm
       cl_arm_shared_virtual_memory
         for Shared Virtual Memory (SVM) capabilities in OpenCL 1.2 devices;

       cl_nv_device_attribute_query
         for NVIDIA-specific device attributes;

       cl_intel_exec_by_local_thread
         for the Intel extension allowing CPU devices to run kernels as part of the current  host
         thread;

       cl_intel_advanced_motion_estimation
         for the version of the Intel Motion Estimation accelerator version;

       cl_intel_device_side_avc_motion_estimation
         for the version and supported features of Intel's device-side AVC Motion;

       cl_intel_planar_yuv
         for the maximum dimensions of planar YUV images;

       cl_intel_simultaneous_sharing
         for simultaneous CL/GL/DirectX context sharing (only partial support);

       cl_intel_required_subgroup_size
         to enumerate allowed sub-group sizes;

       cl_altera_device_temperature
         for the Altera extension to query the core temperature of the device;

       cl_qcom_ext_host_ptr
         for  the  QUALCOMM  extension to query page size and required padding in external memory
         allocation.

NOTES

       Some information is duplicated when available from multiple sources.  Examples:

       · supported device partition types and domains as obtained using the cl_ext_device_fission
         extension  typically  match the ones obtained using the core OpenCL 1.2 device partition
         feature;

       · the preferred work-group size multiple matches the NVIDIA warp size (on NVIDIA  devices)
         or the AMD wavefront width (on AMD devices).

       Some  floating-point  configuration  flags  may only be meaningful for specific precisions
       and/or specific OpenCL versions. For example, CL_FP_CORRECTLY_ROUNDED_DIVIDE_SQRT is  only
       relevant for single precision in OpenCL 1.2 devices.

       The  implementation-defined behavior for NULL platform or context properties is tested for
       the following API calls:

       clGetPlatformInfo()
         by trying to show the platform name;

       clGetDeviceIDs()
         by trying to enumerate devices; the corresponding platform (if any) is then detected  by
         querying the device platform of the first device;

       clCreateteContext()
         by  trying  to  create  a  context  from a device from the previous list (if any), and a
         context from a device from a different platform;

       clCreateteContextFromType()
         by trying to create contexts for each device type (except DEFAULT).

EXPERIMENTAL FEATURES

       Support for OpenCL 2.x properties is not fully tested.

       Support for cl_khr_subgroup_named_barrier is experimental due to  missing  definitions  in
       the official OpenCL headers.

       Raw  (machine-parsable)  output  is considered experimental, the output format might still
       undergo changes.

       The properties of the ICD loader will also  be  queried  if  the  clGetICDLoaderInfoOCLICD
       extension function is found.

       Support for the properties exposed by cl_amd_copy_buffer_p2p is experimental.

       Support    for    some    (documented    and    undocumented)    properties   exposed   by
       cl_amd_device_attribute_query is experimental (see also LIMITATIONS).

       Support for the interop lists exposed by cl_intel_simultaneous_sharing is experimental.

       The highest OpenCL version supported by the ICD  loader  is  detected  with  some  trivial
       heuristics  (symbols found); a notice is output if this is lower than the highest platform
       OpenCL version, or if the detected version doesn't match  the  one  declared  by  the  ICD
       loader itself.

LIMITATIONS

       OpenCL  provides no explicit mean to detect the supported version of any extension exposed
       by a device, which makes it impossible to determine a priori if it  will  be  possible  to
       successfully  query a device about a specific property.  Additionally, the actual size and
       meaning of some properties are not officially declared anywhere.

       Most  notably,  this  affects  extensions  such   as   cl_amd_device_attribute_query   and
       cl_nv_device_attribute_query.   Heuristics based on standard version support are partially
       used in the code to determine which version may be supported.

       Properties which are known to be affected by these limitations include:

       CL_DEVICE_GLOBAL_FREE_MEMORY_AMD
         documented in v3 of the cl_amd_device_attribute_query extension specification  as  being
         the  global  free  memory  in KBytes, without any explanation given on why there are two
         values;

       CL_DEVICE_AVAILABLE_ASYNC_QUEUES_AMD
         documented in v3 of the cl_amd_device_attribute_query extension specification,  but  not
         reported  by  drivers  supporting  other  v3  properties.  This has now been enabled for
         drivers assumed to support v4 of the same extension;

       CL_DEVICE_TERMINATE_CAPABILITY_KHR
         exposed by the cl_khr_terminate_context has changed value between OpenCL  1.x  and  2.x,
         and it's allegedly a bitfield, whose values are however not defined anywhere.

BUGS

       Please     report     any     issues     on     the     project    tracker    on    GitHub
       ⟨http://github.com/Oblomov/clinfo⟩.