I need a way to create an memory object which can be accessed parallelly both in CPU and GPU, this memory will be read only. How can I do it?
I need a way to create an memory object which can be accessed parallelly both in CPU and GPU, this memory will be read only. How can I do it?
Hi!when i was using CL_MEM_USE_HOST_PTR flag to create buffer or image, i hvae some questions about the driver's action. Hope for help.
Q1: Why Copies the data pointed to by the host memory pointer into the buffer when the first kernel using this buffer…
Hi,
I am using OpenCL 2.0 in Mali-G72 based Android device and I am encountering a very large kernel queue/submit time overhead (CL_PROFILING_COMMAND_START - CL_PROFILING_COMMAND_QUEUED). it is sometimes 10X higher than the kernel execution time (CL_PROFILING_COMMAND_END…
Hello.
Does L2 cache data invalidated after finishing each kernel invocation? If not the case, does invalidation depends on memory type (SVM, old buffers, mapped old buffers, etc)?
Question related to Bifrost and Valhall architectures.
Hi, Is there some difference between clEnqueueSVMMap for coarse SVM and clEnqueueMapBuffer in theory? If there is, will this cause difference about performance?
1, clImportMemoryARM 可以导入HAL_PIXEL_FORMAT_YCrCb_420_SP (NV21格式的图)的GraphicBuffer吗?
2, 支持cl_arm_import_memory_host的话, 任何host 端malloc出来的memory都可以 clImportMemoryARM吗, 有无约束?
3, GraphicBuffer lock&lockYCbCr 出来的内存地址(CPU可用)可否用cl_arm_import_memory_host 来clImportMemoryARM…
Hi. According to Arm Mali GPU Datasheet 2020.pdf document there are several modes for maximum thread count, for Mali G76 it is 2 such modes, 768 threads for 0-32 work registers, and 384 for 33-64 work registers.
Is it possible that register spilling can…
Hi,
I am doing an image crop and writing to the destination. I am using a vector load and store of 8 uchar's. can someone help in optimizing this kernel . any mali G-72 gpu specific changes required?
uchar* src_y : source pointer to Y data of the…
Hi,
I am working on a video solution code. where I have to provide source image to GPU and do computation and write in the destination. I read that using buffer creates in the loop every time will add GPU overhead.so, I implemented the following. but…
I wan to build OpenCL 2.0 kernel (it uses OpenCL C 2.0 language in kernel code) using malioc (Mali Offline Compiler) .
Here is my command line:
malioc --name TestKernel --core Mali-G76 kernels.cl
In my kernel code I check value of __OPENCL_VERSION__ and it…
When we create physical zero copy buffers using cl_arm_import_memory, do we really need to perform map/unmap operations everytime we make changes to the buffer from the CPU side. Since, both GPU and CPU access the same memory, will not the changes propagate…
I wish to implement an optimised sgemm for Mali MidGard Gpu whichas of now only support OpenCL 1.2. As far as I know, OpenCL 1.2 doesn't support subgroup extensions and Mali GPUs don't have any benefits for local memory tiling. So What should be the best…
So, I am trying to perform some operation inside an OpenCL kernel. I have this buffer named filter which is a 3x3 matrix initialized with value 1.
I pass this as an argument to the OpenCL kernel from the host side. The issue is when I try to fetch this…
I am trying to allocate a zero copy buffer on Mali Midgard GPUs . The OpenCL 1.2 guide mentions that the only sure shot way to do this is to use the flag
CL_MEM_ALLOC_HOST_PTR
SO, First we need to allocate the Gpu memory using the flag and then perform…
Hello,
Since lack of local memory in Mali, I am trying to use subgroups as Intel does in clDNN library, although they have local memory but registers exchange even faster than local memory. I have three questions about subgroups in Bifrost and Valhall implementation…
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hi,
I was able to run JNI Opencl kernel on my mali T830 by coping the system/vendor/lib/libGLES_mali.so and libOpenCL.so to the JNI folder on android studio. of course we to load some library through
System.loadLibrary(xxx).
I hace done the same with my…
I know, I know… it’s been a while since I wrote my last Arm Compute Library blog, but I promise that your patience will be rewarded. There’s a whole host of freshly integrated functions, features and performance optimizations that I want to share with…
I'd like to manipulate GPU to neural net.
My environment is odroid-xu4 that constructed with exynos5422(cortex-15, cortex-7, mali-t628GPU) and TIZEN OS based linux kernel
i googled about GPU, they recommended using OpenCL and Arm compute library
…Hi,
I have seen the ARM webpage to download the NEON driver but I can't find it.
In fact, I want to run OpenCl on ARM Cortex A but I can't because I need to install the NEON tool.
Is this driver available for download?
Thanks
Sirine.
Hi,
I find OpenCL mode in ARM DS-5 Streamline user guide, but can't get it when using it. I am using DS-5 5.27.1 and r7p0 driver.
The user guide says "To enable OpenCL mode, you must create an instrumentation configuration file. For details of the…
Hi,all
I am now based on MediaTek's Helio X20 development Opencl algorithm, but it is not clear that the specific structure of the X20 mali-T880, including the number of shadercore, the size of the L1 cach, L2 cach size, etc.. Can you provide specific…