i.MX ProcessorsのトピックRe: S32V234 OpenCL Full profile support?

S32V234 OpenCL Full profile support?

cristina_murill — Tue, 07 May 2019 15:59:56 GMT

Hi,

I am working with a S32V234 EVB2, with BSP20 and Vivante SDK from binaries_gpu_userspace_vtk_6.2.4.

After running clinfo, I can see that I am using the embedded profile.

CL_DEVICE_PROFILE: EMBEDDED_PROFILE

Is the full profile supported? How to enable it?

Thank you

Re: S32V234 OpenCL Full profile support?

Bio_TICFSL — Wed, 08 May 2019 14:33:50 GMT

Hello Cristina,

The S32 and vtk6.2.4 support openCL 1.2/1.1 full profile but In short, the main differences here are in floating-point accuracy. In other words, the embedded profile need not adhere to the IEEE 754 floating-point specification, which may be a problem if you are doing lots of numerical calculations which rely on it. Quoted from the specification:

This relaxation of the requirement to adhere to IEEE 754 requirements for basic floating- point operations, though extremely undesirable, is to provide flexibility for embedded devices that have lot stricter requirements on hardware area budgets.

while desktop profiles must have a compiler available to compile OpenCL kernels, embedded profiles need not provide one. This can be seen through the clGetDeviceInfo documentation, which states:

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.

Regards

Re: S32V234 OpenCL Full profile support?

cristina_murill — Thu, 09 May 2019 07:44:38 GMT

Hi,

thank you for the information. In my case,

Platform ID: 0
   CL_PLATFORM_NAME:       Vivante OpenCL Platform
   CL_PLATFORM_PROFILE:    EMBEDDED_PROFILE
   CL_PLATFORM_VERSION:    OpenCL 1.1 V6.2.4.p2.163672
   CL_PLATFORM_VENDOR:     Vivante Corporation
   CL_PLATFORM_EXTENSIONS: cl_khr_icd
   Available devices:      1

   Device ID:     0
   Device Ptr:    0x158881e0
       CL_DEVICE_NAME: Vivante OpenCL Device GC3000.5451.0000
       CL_DEVICE_VENDOR: Vivante Corporation
       CL_DEVICE_TYPE:                GPU
        CL_DEVICE_OPENCL_C_VERSION:            OpenCL C 1.1
       CL_DEVICE_VENDOR_ID:                0x00564956
       CL_DEVICE_PLATFORM:                0xb304d598
       CL_DEVICE_VERSION:                OpenCL 1.1
       CL_DEVICE_PROFILE:                EMBEDDED_PROFILE
       CL_DRIVER_VERSION:                OpenCL 1.1 V6.2.4.p2.163672

CL_DEVICE_COMPILER_AVAILABLE: Yes

As you mentioned, that vtk6.2.4 supports openCL 1.2/1.1 full profile, how can we switch to the full profile?