xenial (1) clinfo.1.gz

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:

       --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.

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

       cl_khr_icd
         for the suffix of vendor extensions functions;

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

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

       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 2.0 and OpenCL 2.1 properties is not fully tested.

       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.

       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.

BUGS

       The   CL_DEVICE_GLOBAL_FREE_MEMORY_AMD   device   information   is    documented    in    v3    of    the
       cl_amd_device_attribute_query  extension  specification as being the global free memory in KBytes, but no
       explanation is given on why there are two values.

       The   CL_DEVICE_AVAILABLE_ASYNC_QUEUES_AMD   device   information   is   documented   in   v3   of    the
       cl_amd_device_attribute_query  extension  specification,  but  not  reported by current drivers, so it is
       currently disabled.

       The  CL_DEVICE_SIMULTANEOUS_INTEROPS_INTEL  device  information  for  the   cl_intel_simultaneous_sharing
       extension is not reported, due to lack of knowledge on the possible values the list elements can have.

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