bank-conflict | 易学教程

GPU Shared Memory Bank Conflict

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问题 I am trying to understand how bank conflicts take place. if i have an array of size 256 in global memory and i have 256 threads in a single Block, and i want to copy the array to shared memory. therefore every thread copies one element. shared_a[threadIdx.x]=global_a[threadIdx.x] does this simple action result in a bank conflict? suppose now that the size of the array is larger than the number of threads, so i am now using this to copy the global memory to the shared memory: tid = threadIdx.x

What's the mechanism of the warps and the banks in CUDA?

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问题 I'm a rookie in learning CUDA parallel programming. Now I'm confused in the global memory access of device. It's about the warp model and coalescence. There are some points: It's said that threads in one block are split into warps. In each warp there are at most 32 threads. That means all these threads of the same warp will execute simultaneously with the same processor. So what's the senses of half-warp? When it comes to the shared memory of one block, it would be split into 16 banks. To

Why aren't there bank conflicts in global memory for Cuda/OpenCL?

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问题 One thing I haven't figured out and google isn't helping me, is why is it possible to have bank conflicts with shared memory, but not in global memory? Can there be bank conflicts with registers? UPDATE Wow I really appreciate the two answers from Tibbit and Grizzly. It seems that I can only give a green check mark to one answer though. I am newish to stack overflow. I guess I have to pick one answer as the best. Can I do something to say thank you to the answer I don't give a green check to?

Why aren't there bank conflicts in global memory for Cuda/OpenCL?

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One thing I haven't figured out and google isn't helping me, is why is it possible to have bank conflicts with shared memory, but not in global memory? Can there be bank conflicts with registers? UPDATE Wow I really appreciate the two answers from Tibbit and Grizzly. It seems that I can only give a green check mark to one answer though. I am newish to stack overflow. I guess I have to pick one answer as the best. Can I do something to say thank you to the answer I don't give a green check to? Short Answer: There are no bank conflicts in either global memory or in registers. Explanation: The

What is a bank conflict? (Doing Cuda/OpenCL programming)

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I have been reading the programming guide for CUDA and OpenCL, and I cannot figure out what a bank conflict is. They just sort of dive into how to solve the problem without elaborating on the subject itself. Can anybody help me understand it? I have no preference if the help is in the context of CUDA/OpenCL or just bank conflicts in general in computer science. Grizzly For nvidia (and amd for that matter) gpus the local memory is divided into memorybanks. Each bank can only address one dataset at a time, so if a halfwarp tries to load/store data from/to the same bank the access has to be

What is a bank conflict? (Doing Cuda/OpenCL programming)

阅读更多关于 What is a bank conflict? (Doing Cuda/OpenCL programming)

问题 I have been reading the programming guide for CUDA and OpenCL, and I cannot figure out what a bank conflict is. They just sort of dive into how to solve the problem without elaborating on the subject itself. Can anybody help me understand it? I have no preference if the help is in the context of CUDA/OpenCL or just bank conflicts in general in computer science. 回答1: For nvidia (and amd for that matter) gpus the local memory is divided into memorybanks. Each bank can only address one dataset