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Questions tagged [opencl-c]

OpenCL C is a programming language based on C99 that is used for writing kernel code to be used in OpenCL.

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Static variable in OpenCL C

I'm writing a renderer from scratch using openCL and I have a little compilation problem on my kernel with the error : CL_BUILD_PROGRAM : error: program scope variable must reside in constant address space static float* objects; The problem is that…
Matt
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OpenCL (in-kernel) callable SVD kernel code?

I'm studying how to offload some quite heavy calculations on GPUs. Although on my machine I have a NVIDIA RTX GPU, I would like to avoid using CUDA in order to develop something portable on other GPUs as well (at least in its core). Thus the choice…
mEm
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why doesn't the OpenCL kernel execute even though there are no errors? (c, nvidia, kubuntu)

I'm learning opencl and for some reason the kernel does nothing: #include #include #define CL_TARGET_OPENCL_VERSION 300 #include int err = 0; #define PRINTERR() fprintf(stderr, "Error at line %u.\n",…
Meh
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OpenCL: Can you have a `const __global` type or just `__global`?

I am looking at a piece of OpenCL code. Currently we do a typedef: "#if __OPENCL_VERSION__ <= 120\n" "#define " + dataName + "_type __constant\n" "#else \n" "#define " + dataName + "_type const __global\n" Does const __global…
madtowneast
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Access components of vector data type (e.g. int4) as array of scalars in OpenCL

I have kernel which evaluate interaction between all pairs of neighbors of an atoms. Each atom has max. 4 neighbors so I store their indexes in int4. But in order to loop over these neighbors I need to access them by index (neighs[0] rather than…
Prokop Hapala
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Multithreaded union-find algorithm not working properly

I am trying to implement a multithreaded Union-Find algorithm as outlined in this paper (https://citeseerx.ist.psu.edu/viewdoc/download?oi=10.1.1.56.8354&rep=rep1&type=pdf). Using this, I am trying to find out the number of connected components in…
Sayan Barrie Mccullum
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using array of struct inside opencl kernel

I'm trying to define a global array of structs inside opencl kernel. I get some data from the host, and trying to assign it to that structure, but when I print the result structure, I get a lot of racing values when I printf the values. The struct…
andre_lamothe
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OpenCL shared memory reduction correctness

While playing with OpenCL, I encountered a bug that I can't explain. Below is a reduction algorithm simply adapted to GPU like accelerators. You can see two versions of the reduction algorithm. V0 uses shared memory. V1 uses the work_group_reduce_<>…
Etienne M
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Non deterministic behavior of native_ functions in OpenCL kernel

TL;DR: Using native_log2() produces non deterministic behavior in OpenCL kernel, while using log2() produces deterministic behavior. Why is this happening? So I have this function below acting as a helper function for an OpenCL kernel, and I was…
Iago Storch
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OpenCL FPGA: Kernel Execution of 2 copies of same kernel is not being made in parallel. In addition to that, there is also idle time in between them

My goal is to complete FFTs of 2 - 4K Data points together. Hence, I made 2 kernel objects from the same kernel and Enqueued the tasks at once, i.e. without any Buffer Read-Write or any callbacks in between. I find out that it doesn't happen that…
Raghuttam Hombal
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Can I make HTTP requests using OpenCL in C#?

Can I make HTTP requests using OpenCL in C#? I tryed to do this calling system("curl website.com") but only getting an error about system implicit calling.
Anna Boyko
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Opencl clGetDeviceIDs(platform, CL_DEVICE_TYPE_CPU, 0, NULL, &num_devices) returning -1

I'm using Intel OpenCL SDK. Last month, when I tried to run my opencl code on CPU present in my system , by clGetDeviceIDs(platform, CL_DEVICE_TYPE_CPU, 0, NULL, &num_devices), it worked..and number of total platforms its detected is 2.One is Intel…
Waseema Risaana
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OpenCL C++ HelloWorld

Good afternoon! I am learning OpenCL C++ in this tutorial: Click (it's not necessary) The video uses CL API version 1.2, so I downloaded the OpenCL 1.2 headers from the link in this reply: https://stackoverflow.com/a/57017982/11968932 Visual Studio…
maxet24
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CL/cl.hpp: No such file or directory | NVIDIA GeForce

Good afternoon! I'm trying to run code in C++ that has the following line: #include But launching the program gives this error: fatal error: CL/cl.hpp: No such file or directory What have I tried to do? Completely reinstalling…
maxet24
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Retrieving number of opencl kernel programs that end with a certain result

My Goal is to get a number of kernels, where it's calculation satisfies a condition. The condition could be value == 0. I tried to find some built-in semaphore function to accomplish this, but I couldn't find any for OpenCL. I do not want to blit…
The A
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