• CL_MEM_USE_HOST_PTR overhead

    Jeff M
    Jeff M

    Hi,

    I would like to confirm whether CL_MEM_USE_HOST_PTR has extra overhead, such as memory copy, on Mali G72.  

    According to ARM OpenCL Optimization Guide, using CL_MEM_USE_HOST_PTR is discouraged.  

    http://infocenter.arm.com/help/index.jsp?topic=/com.arm…

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Help! OpenCL implementation for matrix vector multiply

    kullboys
    kullboys

    Hello everyone

    I am trying to perform matrix vector multiply(both dense and sparse matrix) using Mali, I have looked at ARM ComputeLibrary and I don't really see a specialized sgemv, just wondering if I should just use sgemm for this purpose?

    Is there…

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Is there any prefetch mechanism on Mali Bifrost GPU?

    zengzeng.sun
    zengzeng.sun

    Hi Guys,

    I am actively optimizing my OpenCL program running on Mali Bifrost GPU.

    I wonder whether cache prefetch would have some performance improvements for my program.

    I didn't find any materials about mali GPU prefetching, however, I found there is…

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Does OpenCL1.1 on Mali-T760 MP4 support cl_ext_device_fission?

    fengxueem
    fengxueem

    Hi, everyone

    Background:

    I am working on a project utilizing MACE(https://github.com/XiaoMi/mace a CNN inference framework designed for mobile devices like Mali GPU). This framework uses OpenCL to perform computation on Mali GPU. And I have an Android…

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • opencl issue with Hikey970 (Mali G72)

    chunis
    chunis

    Currently I run Ubuntu on Huawei Hikey 970 board, and try to run gnuradio with gr-fosphor on it, but failed.

    At first, it failed with these lines:

    [!] CL Error (-1001, /build/gr-fosphor-9QC8j4/gr-fosphor-3.7.0.2.7b6b996/lib/fosphor/cl.c:272): Unable to…

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Is the array object in OpenCL kernel mapping to global memory instead of register?

    zengzeng.sun
    zengzeng.sun

    Hi,

    I am trying to implement an OpenCL kernel on G76 with DDK r16.

    I find that if I define and use an array like "half A[16];", the performance will be poor.

    But if I use "half16 A;", the performance is very good.

    I wonder if array…

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Can ARM NN run on ARM Mali 400 MP2

    fatimak
    fatimak

    I wanted to find out if the ARM NN supports the ARM Mali 400 MP2 .

    Regards

    Fatima

    • Answered
    • over 2 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • about local memory in opencl

    tan414
    tan414

    Hello, we are developing a product based on maili T764 (RK3288) with OpenCL. In our kernel, we use about 1kB local memory every workgroup. I was wondering where is these local memory allocated, and if it is possible for us to taking advantage of the L2…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Anderstand OpenCl / OpenGl Es

    Jerome Decamps - 杜尚杰
    Jerome Decamps - 杜尚杰

    Hi 

    I have a newbie question

    What are the main differencies between OpenCl and OpenGl Es ?

    In which case do you use the first or the second ?

     

    May you explain me shortly ?

    Thanks & regards,

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • L2 cache in Mali-T628

    Daveh Shingari
    Daveh Shingari

    Hi

    I am working on Odroid board which has Mali GPU - T628. To understand the architecture better , for my research, I am looking for answers to following questions (Any help will be highly appreciated)

    Q. What is size of L1 cache (Does this hold true: …

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • MFC and Image processing on Samsung Exynos-5422

    mans
    mans

    I wan to debayer, white balance and .. using available hard ware on this ARM processor. I am not sure if it relates to this forum or not ( ), but hopefully someone redirect me to some detail information where I can find information.

    My images are arriving…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • When will OpenCL 1.2 or 2.0 drivers be released for the T6XX GPUs?

    Benjamin Schleimer
    Benjamin Schleimer

    Hi,

        I have a couple of ODroid XU3s and they are working great. They are running the Mali T628 GPUs and currently support OpenCL 1.1.

    However, I want to switch over to OpenCL 1.2 or 2.0 for future development work.

    Does anyone know when…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • OpenCL strange  Performance Numbers -Mali T760 MP8

    Ravishekhar Banger
    Ravishekhar Banger

    I have a fairly complex OpenCL implementation with 2D NDRange as follows:

    Num of Work Groups - {10,7}

    Work Group Size {64,1},

    With this I get a performance of 0.625 Secs, But when i decrease the number of work groups to {10,4} the performance degrades…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Is there offline compiler for Mali-T628 MP6 OpenCL?

    Heejin Park
    Heejin Park

    Hello, I'm using Odroid-XU3.

    And I installed Opencv 3.0.0-rc1 on odroid-xu3 ubuntu 14.04.


    I want to use function clCreateProgramWithBinary() instead of clCreateProgramWithSource().

    Because of build time for clCreateProgramWithSource() and clBuildProgram…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • OpenCL threads on Mali T628

    Alok Prakash
    Alok Prakash

    Hello Guys peterharris I am using a Mali T628 GPU on the Odroid XU3 board with Exynos 5422 chip. I have a couple of questions regarding OpenCL on the Mali GPU:


    1. Can we get information of active threads or work groups per shader core for Mali-T6xx similar…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Making Mali Graphics Debugger work with opencl on Odroid Xu3

    Rui Albuquerque
    Rui Albuquerque

    Hey!

    I'm trying to debug an opencl application on my Odroid Xu3 (With the Mali-T628 MP6), and when i try to use MGD, it completely crashes after the first opencl call giving me this error that the passthroughglesapi could not locate the handler function…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • opencl map to cpu cost long time

    yang
    yang

    I used opencl1.1 on Mali628(Exynos5422)。

    1.

    first I create a buffer

    buffer = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_MEM_ALLOC_HOST_PTR, 1280*720*4, NULL, &errorNumber);

    next call the kernel to handle the buffer and waiting the command queue finish…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • How to program using GPU?

    BANGYONG SONG
    BANGYONG SONG

    Hello Nice to meet you

    Please understand my bad english

    To learn to program using GPU, I have been searching informations.

    My device for test is Galaxy S6 and GPU is ARM Mali T-760.

    I'm going to try to use GPU for computer vision.

    To set up environment…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Opencl error sampler_t

    bu
    bu

    Hello,

    I am developping a short application to downsampling images on my samsung alpha.

    I use OpenCL to develop on my GPU.

    I have a problem when I use a sampler_t. Just when I decrare a sampler_t variable in my kernel, the program crash and gave me that…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Can I create a opencl buffer from a GraphicBuffer or a raw ion buffer

    songmao
    songmao

    Hello,

          I found out that on qcom platform, there's a extension,

    https://www.khronos.org/registry/cl/extensions/qcom/cl_qcom_ion_host_ptr.txt

    Can I do the same on mali T760, android platform?

    Songmao

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Mali GPU OpenCL board

    Omry Sendik
    Omry Sendik

    Dear experts,

    I am looking for a board with a Mali T-8xx and a reasonable CPU (A9/A15/A53/A57/etc.) for developing software IPs over OpenCL

    1. Can you recommend a board?
    2. Can you recommend a development environment?
    3. Do development environments have emulation…
    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • SDK samples running on CPU instead of GPU

    Ben
    Ben

    I have been opencl on the Odroid-XU3 board, this has an ARM big.LITTLE core and a Mali-T628.

    I am trying to run the Rodinina Benchmarking Suite (Found here) on each core and the GPU separately. I have gotten the code working on each CPU using POCL. Now…

    • Answered
    • over 5 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • What's the best way to fill a buffer?

    songmao
    songmao

    ARM Graphic expert:

         I have a cl_mem buffer, which will be reused every camera frame,  so it need reset to zero before we can use it.

         for opencl 1.2 we can use clEnqueueFillBuffer, for mali driver, what would be the most…

    • Answered
    • over 4 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • Mali T628 user space driver performance

    Joe
    Joe

    Hi,

    I have an OpenCL program that runs on a Mali T628 platform. Originally I was using kernel driver r5p1-00rel1 and user driver r5p0-06rel0. But I was constantly hitting what seemed like a deadlock in the close-source user driver. And my program would…

    • Answered
    • over 4 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
  • prefix sum with Opencl

    Irving.Qin
    Irving.Qin

    Hi, I am accelerating a image processing algorithm with OpenCL on the cellphone, however I met a case which had a very poor performance.

    The case is to calculate the prefix sum of each row on the image (a 2D buffer). For example, a 3x3 image:

    50   32  

    …
    • Answered
    • over 4 years ago
    • Graphics and Gaming
    • Graphics and Gaming forum
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