What is this?

clinfo is a simple command-line application that enumerates all possible (known) properties of the OpenCL platform and devices available on the system.

Inspired by AMD's program of the same name, it is coded in pure C and it tries to output all possible information, including those provided by platform-specific extensions, trying not to crash on unsupported properties (e.g. 1.2 properties on 1.1 platforms).

Usage

clinfo [options...]

Common used options are -l to show a synthetic summary of the available devices (without properties), and -a, to try and show properties even if clinfo would otherwise think they aren't supported by the platform or device.

Refer to the man page for further information.

Use cases

verify that your OpenCL environment is set up correctly; if clinfo cannot find any platform or devices (or fails to load the OpenCL dispatcher library), chances are high no other OpenCL application will run;
verify that your OpenCL development environment is set up correctly: if clinfo fails to build, chances are high no other OpenCL application will build;
explore/report the actual properties of the available device(s).

Segmentation faults

Some faulty OpenCL platforms may cause clinfo to crash. There isn't much clinfo itself can do about it, but you can try and isolate the platform responsible for this. On POSIX systems, you can generally find the platform responsible for the fault with the following one-liner:

find /etc/OpenCL/vendors/ -name '*.icd' | while read OPENCL_VENDOR_PATH ; do clinfo -l > /dev/null ; echo "$? ${OPENCL_VENDOR_PATH}" ; done

Building

Building requires an OpenCL SDK (or at least OpenCL headers and development files), and the standard build environment for the platform. No special build system is used (autotools, CMake, meson, ninja, etc), as I feel adding more dependencies for such a simple program would be excessive. Simply running make at the project root should work.

Windows support

The application can usually be built in Windows too (support for which required way more time than I should have spent, really, but I digress), by running make in a Developer Command Prompt for Visual Studio, provided an OpenCL SDK (such as the Intel or AMD one) is installed.

Precompiled Windows executable are available as artefacts of the AppVeyor CI.

Build status	Windows binaries
	32-bit	64-bit

CMake support

Cmake support is added for an alternative way to build on all platforms (Windows, Linux, Android).

On Windows/Linux, use vcpkg install OpenCL to install the OpenCL SDK. vcpkg can be installed here. Note: On 64-bit Windows, you may use vcpkg install OpenCL:x64-windows instead. To build on Windows/Linux, type these commands:

git clone https://github.com/HO-COOH/clinfo
cd clinfo
mkdir build
cd build
cmake .. -DCMAKE_TOOLCHAIN_FILE="<path_to_vcpkg>/scripts/buildsystems/vcpkg.cmake"
cmake --build .

On Android, the OpenCL header files is automatically download from KhronosGroup's repo and the OpenCL runtime library is automatically found and linked. Install a terminal emulator app like termux, and install cmake, git, clang by pkg install cmake git clang. And type these commands to build:

git clone https://github.com/HO-COOH/clinfo
cd clinfo
mkdir build
cd build
cmake ..
cmake --build .